code.delx.au - gnu-emacs/blob - lisp/gnus/mml2015.el

   1 ;;; mml2015.el --- MIME Security with Pretty Good Privacy (PGP)
   2
   3 ;; Copyright (C) 2000-2011 Free Software Foundation, Inc.
   4
   5 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
   6 ;; Keywords: PGP MIME MML
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; RFC 2015 is updated by RFC 3156, this file should be compatible
  26 ;; with both.
  27
  28 ;;; Code:
  29
  30 (eval-and-compile
  31   ;; For Emacs <22.2 and XEmacs.
  32   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r)))
  33
  34   (if (locate-library "password-cache")
  35       (require 'password-cache)
  36     (require 'password)))
  37
  38 (eval-when-compile (require 'cl))
  39 (require 'mm-decode)
  40 (require 'mm-util)
  41 (require 'mml)
  42 (require 'mml-sec)
  43
  44 (defvar mc-pgp-always-sign)
  45
  46 (declare-function epg-check-configuration "ext:epg-config"
  47                   (config &optional minimum-version))
  48 (declare-function epg-configuration "ext:epg-config" ())
  49
  50 (defvar mml2015-use (or
  51                      (condition-case nil
  52                          (progn
  53                            (require 'epg-config)
  54                            (epg-check-configuration (epg-configuration))
  55                            'epg)
  56                        (error))
  57                      (progn
  58                        (ignore-errors (require 'pgg))
  59                        (and (fboundp 'pgg-sign-region)
  60                             'pgg))
  61                      (progn (ignore-errors
  62                               (load "mc-toplev"))
  63                             (and (fboundp 'mc-encrypt-generic)
  64                                  (fboundp 'mc-sign-generic)
  65                                  (fboundp 'mc-cleanup-recipient-headers)
  66                                  'mailcrypt)))
  67   "The package used for PGP/MIME.
  68 Valid packages include `epg', `pgg' and `mailcrypt'.")
  69
  70 ;; Something is not RFC2015.
  71 (defvar mml2015-function-alist
  72   '((mailcrypt mml2015-mailcrypt-sign
  73                mml2015-mailcrypt-encrypt
  74                mml2015-mailcrypt-verify
  75                mml2015-mailcrypt-decrypt
  76                mml2015-mailcrypt-clear-verify
  77                mml2015-mailcrypt-clear-decrypt)
  78     (pgg mml2015-pgg-sign
  79          mml2015-pgg-encrypt
  80          mml2015-pgg-verify
  81          mml2015-pgg-decrypt
  82          mml2015-pgg-clear-verify
  83          mml2015-pgg-clear-decrypt)
  84     (epg mml2015-epg-sign
  85          mml2015-epg-encrypt
  86          mml2015-epg-verify
  87          mml2015-epg-decrypt
  88          mml2015-epg-clear-verify
  89          mml2015-epg-clear-decrypt))
  90   "Alist of PGP/MIME functions.")
  91
  92 (defvar mml2015-result-buffer nil)
  93
  94 (defcustom mml2015-unabbrev-trust-alist
  95   '(("TRUST_UNDEFINED" . nil)
  96     ("TRUST_NEVER"     . nil)
  97     ("TRUST_MARGINAL"  . t)
  98     ("TRUST_FULLY"     . t)
  99     ("TRUST_ULTIMATE"  . t))
 100   "Map GnuPG trust output values to a boolean saying if you trust the key."
 101   :version "22.1"
 102   :group 'mime-security
 103   :type '(repeat (cons (regexp :tag "GnuPG output regexp")
 104                        (boolean :tag "Trust key"))))
 105
 106 (defcustom mml2015-cache-passphrase mml-secure-cache-passphrase
 107   "If t, cache passphrase."
 108   :group 'mime-security
 109   :type 'boolean)
 110
 111 (defcustom mml2015-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
 112   "How many seconds the passphrase is cached.
 113 Whether the passphrase is cached at all is controlled by
 114 `mml2015-cache-passphrase'."
 115   :group 'mime-security
 116   :type 'integer)
 117
 118 (defcustom mml2015-signers nil
 119   "A list of your own key ID which will be used to sign a message."
 120   :group 'mime-security
 121   :type '(repeat (string :tag "Key ID")))
 122
 123 (defcustom mml2015-sign-with-sender nil
 124   "If t, use message sender so find a key to sign with."
 125   :group 'mime-security
 126   :type 'boolean
 127   :version "24.1")
 128
 129 (defcustom mml2015-encrypt-to-self nil
 130   "If t, add your own key ID to recipient list when encryption."
 131   :group 'mime-security
 132   :type 'boolean)
 133
 134 (defcustom mml2015-always-trust t
 135   "If t, GnuPG skip key validation on encryption."
 136   :group 'mime-security
 137   :type 'boolean)
 138
 139 ;; Extract plaintext from cleartext signature.  IMO, this kind of task
 140 ;; should be done by GnuPG rather than Elisp, but older PGP backends
 141 ;; (such as Mailcrypt, and PGG) discard the output from GnuPG.
 142 (defun mml2015-extract-cleartext-signature ()
 143   ;; Daiki Ueno in
 144   ;; <54a15d860801080142l70b95d7dkac4bf51a86196011@mail.gmail.com>: ``I still
 145   ;; believe that the right way is to use the plaintext output from GnuPG as
 146   ;; it is, and mml2015-extract-cleartext-signature is just a kludge for
 147   ;; misdesigned libraries like PGG, which have no ability to do that.  So, I
 148   ;; think it should not have descriptive documentation.''
 149   ;;
 150   ;; This function doesn't handle NotDashEscaped correctly.  EasyPG handles it
 151   ;; correctly.
 152   ;; http://thread.gmane.org/gmane.emacs.gnus.general/66062/focus=66082
 153   ;; http://thread.gmane.org/gmane.emacs.gnus.general/65087/focus=65109
 154   (goto-char (point-min))
 155   (forward-line)
 156   ;; We need to be careful not to strip beyond the armor headers.
 157   ;; Previously, an attacker could replace the text inside our
 158   ;; markup with trailing garbage by injecting whitespace into the
 159   ;; message.
 160   (while (looking-at "Hash:")           ; The only header allowed in cleartext
 161     (forward-line))                     ; signatures according to RFC2440.
 162   (when (looking-at "[\t ]*$")
 163     (forward-line))
 164   (delete-region (point-min) (point))
 165   (if (re-search-forward "^-----BEGIN PGP SIGNATURE-----" nil t)
 166       (delete-region (match-beginning 0) (point-max)))
 167   (goto-char (point-min))
 168   (while (re-search-forward "^- " nil t)
 169     (replace-match "" t t)
 170     (forward-line 1)))
 171
 172 ;;; mailcrypt wrapper
 173
 174 (autoload 'mailcrypt-decrypt "mailcrypt")
 175 (autoload 'mailcrypt-verify "mailcrypt")
 176 (autoload 'mc-pgp-always-sign "mailcrypt")
 177 (autoload 'mc-encrypt-generic "mc-toplev")
 178 (autoload 'mc-cleanup-recipient-headers "mc-toplev")
 179 (autoload 'mc-sign-generic "mc-toplev")
 180
 181 (defvar mml2015-decrypt-function 'mailcrypt-decrypt)
 182 (defvar mml2015-verify-function 'mailcrypt-verify)
 183
 184 (defun mml2015-format-error (err)
 185   (if (stringp (cadr err))
 186       (cadr err)
 187     (format "%S" (cdr err))))
 188
 189 (defun mml2015-mailcrypt-decrypt (handle ctl)
 190   (catch 'error
 191     (let (child handles result)
 192       (unless (setq child (mm-find-part-by-type
 193                            (cdr handle)
 194                            "application/octet-stream" nil t))
 195         (mm-set-handle-multipart-parameter
 196          mm-security-handle 'gnus-info "Corrupted")
 197         (throw 'error handle))
 198       (with-temp-buffer
 199         (mm-insert-part child)
 200         (setq result
 201               (condition-case err
 202                   (funcall mml2015-decrypt-function)
 203                 (error
 204                  (mm-set-handle-multipart-parameter
 205                   mm-security-handle 'gnus-details (mml2015-format-error err))
 206                  nil)
 207                 (quit
 208                  (mm-set-handle-multipart-parameter
 209                   mm-security-handle 'gnus-details "Quit.")
 210                  nil)))
 211         (unless (car result)
 212           (mm-set-handle-multipart-parameter
 213            mm-security-handle 'gnus-info "Failed")
 214           (throw 'error handle))
 215         (setq handles (mm-dissect-buffer t)))
 216       (mm-destroy-parts handle)
 217       (mm-set-handle-multipart-parameter
 218        mm-security-handle 'gnus-info
 219        (concat "OK"
 220                (let ((sig (with-current-buffer mml2015-result-buffer
 221                             (mml2015-gpg-extract-signature-details))))
 222                  (concat ", Signer: " sig))))
 223       (if (listp (car handles))
 224           handles
 225         (list handles)))))
 226
 227 (defun mml2015-gpg-pretty-print-fpr (fingerprint)
 228   (let* ((result "")
 229          (fpr-length (string-width fingerprint))
 230          (n-slice 0)
 231          slice)
 232     (setq fingerprint (string-to-list fingerprint))
 233     (while fingerprint
 234       (setq fpr-length (- fpr-length 4))
 235       (setq slice (butlast fingerprint fpr-length))
 236       (setq fingerprint (nthcdr 4 fingerprint))
 237       (setq n-slice (1+ n-slice))
 238       (setq result
 239             (concat
 240              result
 241              (case n-slice
 242                (1  slice)
 243                (otherwise (concat " " slice))))))
 244     result))
 245
 246 (defun mml2015-gpg-extract-signature-details ()
 247   (goto-char (point-min))
 248   (let* ((expired (re-search-forward
 249                    "^\\[GNUPG:\\] SIGEXPIRED$"
 250                    nil t))
 251          (signer (and (re-search-forward
 252                        "^\\[GNUPG:\\] GOODSIG \\([0-9A-Za-z]*\\) \\(.*\\)$"
 253                        nil t)
 254                       (cons (match-string 1) (match-string 2))))
 255          (fprint (and (re-search-forward
 256                        "^\\[GNUPG:\\] VALIDSIG \\([0-9a-zA-Z]*\\) "
 257                        nil t)
 258                       (match-string 1)))
 259          (trust  (and (re-search-forward
 260                        "^\\[GNUPG:\\] \\(TRUST_.*\\)$"
 261                        nil t)
 262                       (match-string 1)))
 263          (trust-good-enough-p
 264           (cdr (assoc trust mml2015-unabbrev-trust-alist))))
 265     (cond ((and signer fprint)
 266            (concat (cdr signer)
 267                    (unless trust-good-enough-p
 268                      (concat "\nUntrusted, Fingerprint: "
 269                              (mml2015-gpg-pretty-print-fpr fprint)))
 270                    (when expired
 271                      (format "\nWARNING: Signature from expired key (%s)"
 272                              (car signer)))))
 273           ((re-search-forward
 274             "^\\(gpg: \\)?Good signature from \"\\(.*\\)\"$" nil t)
 275            (match-string 2))
 276           (t
 277            "From unknown user"))))
 278
 279 (defun mml2015-mailcrypt-clear-decrypt ()
 280   (let (result)
 281     (setq result
 282           (condition-case err
 283               (funcall mml2015-decrypt-function)
 284             (error
 285              (mm-set-handle-multipart-parameter
 286               mm-security-handle 'gnus-details (mml2015-format-error err))
 287              nil)
 288             (quit
 289              (mm-set-handle-multipart-parameter
 290               mm-security-handle 'gnus-details "Quit.")
 291              nil)))
 292     (if (car result)
 293         (mm-set-handle-multipart-parameter
 294          mm-security-handle 'gnus-info "OK")
 295       (mm-set-handle-multipart-parameter
 296        mm-security-handle 'gnus-info "Failed"))))
 297
 298 (defun mml2015-fix-micalg (alg)
 299   (and alg
 300        ;; Mutt/1.2.5i has seen sending micalg=php-sha1
 301        (upcase (if (string-match "^p[gh]p-" alg)
 302                    (substring alg (match-end 0))
 303                  alg))))
 304
 305 (defun mml2015-mailcrypt-verify (handle ctl)
 306   (catch 'error
 307     (let (part)
 308       (unless (setq part (mm-find-raw-part-by-type
 309                           ctl (or (mm-handle-multipart-ctl-parameter
 310                                    ctl 'protocol)
 311                                   "application/pgp-signature")
 312                           t))
 313         (mm-set-handle-multipart-parameter
 314          mm-security-handle 'gnus-info "Corrupted")
 315         (throw 'error handle))
 316       (with-temp-buffer
 317         (insert "-----BEGIN PGP SIGNED MESSAGE-----\n")
 318         (insert (format "Hash: %s\n\n"
 319                         (or (mml2015-fix-micalg
 320                              (mm-handle-multipart-ctl-parameter
 321                               ctl 'micalg))
 322                             "SHA1")))
 323         (save-restriction
 324           (narrow-to-region (point) (point))
 325           (insert part "\n")
 326           (goto-char (point-min))
 327           (while (not (eobp))
 328             (if (looking-at "^-")
 329                 (insert "- "))
 330             (forward-line)))
 331         (unless (setq part (mm-find-part-by-type
 332                             (cdr handle) "application/pgp-signature" nil t))
 333           (mm-set-handle-multipart-parameter
 334            mm-security-handle 'gnus-info "Corrupted")
 335           (throw 'error handle))
 336         (save-restriction
 337           (narrow-to-region (point) (point))
 338           (mm-insert-part part)
 339           (goto-char (point-min))
 340           (if (re-search-forward "^-----BEGIN PGP [^-]+-----\r?$" nil t)
 341               (replace-match "-----BEGIN PGP SIGNATURE-----" t t))
 342           (if (re-search-forward "^-----END PGP [^-]+-----\r?$" nil t)
 343               (replace-match "-----END PGP SIGNATURE-----" t t)))
 344         (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
 345           (unless (condition-case err
 346                       (prog1
 347                           (funcall mml2015-verify-function)
 348                         (if (get-buffer " *mailcrypt stderr temp")
 349                             (mm-set-handle-multipart-parameter
 350                              mm-security-handle 'gnus-details
 351                              (with-current-buffer " *mailcrypt stderr temp"
 352                                (buffer-string))))
 353                         (if (get-buffer " *mailcrypt stdout temp")
 354                             (kill-buffer " *mailcrypt stdout temp"))
 355                         (if (get-buffer " *mailcrypt stderr temp")
 356                             (kill-buffer " *mailcrypt stderr temp"))
 357                         (if (get-buffer " *mailcrypt status temp")
 358                             (kill-buffer " *mailcrypt status temp"))
 359                         (if (get-buffer mc-gpg-debug-buffer)
 360                             (kill-buffer mc-gpg-debug-buffer)))
 361                     (error
 362                      (mm-set-handle-multipart-parameter
 363                       mm-security-handle 'gnus-details (mml2015-format-error err))
 364                      nil)
 365                     (quit
 366                      (mm-set-handle-multipart-parameter
 367                       mm-security-handle 'gnus-details "Quit.")
 368                      nil))
 369             (mm-set-handle-multipart-parameter
 370              mm-security-handle 'gnus-info "Failed")
 371             (throw 'error handle))))
 372       (mm-set-handle-multipart-parameter
 373        mm-security-handle 'gnus-info "OK")
 374       handle)))
 375
 376 (defun mml2015-mailcrypt-clear-verify ()
 377   (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
 378     (if (condition-case err
 379             (prog1
 380                 (funcall mml2015-verify-function)
 381               (if (get-buffer " *mailcrypt stderr temp")
 382                   (mm-set-handle-multipart-parameter
 383                    mm-security-handle 'gnus-details
 384                    (with-current-buffer " *mailcrypt stderr temp"
 385                      (buffer-string))))
 386               (if (get-buffer " *mailcrypt stdout temp")
 387                   (kill-buffer " *mailcrypt stdout temp"))
 388               (if (get-buffer " *mailcrypt stderr temp")
 389                   (kill-buffer " *mailcrypt stderr temp"))
 390               (if (get-buffer " *mailcrypt status temp")
 391                   (kill-buffer " *mailcrypt status temp"))
 392               (if (get-buffer mc-gpg-debug-buffer)
 393                   (kill-buffer mc-gpg-debug-buffer)))
 394           (error
 395            (mm-set-handle-multipart-parameter
 396             mm-security-handle 'gnus-details (mml2015-format-error err))
 397            nil)
 398           (quit
 399            (mm-set-handle-multipart-parameter
 400             mm-security-handle 'gnus-details "Quit.")
 401            nil))
 402         (mm-set-handle-multipart-parameter
 403          mm-security-handle 'gnus-info "OK")
 404       (mm-set-handle-multipart-parameter
 405        mm-security-handle 'gnus-info "Failed")))
 406   (mml2015-extract-cleartext-signature))
 407
 408 (defun mml2015-mailcrypt-sign (cont)
 409   (mc-sign-generic (message-options-get 'message-sender)
 410                    nil nil nil nil)
 411   (let ((boundary (mml-compute-boundary cont))
 412         hash point)
 413     (goto-char (point-min))
 414     (unless (re-search-forward "^-----BEGIN PGP SIGNED MESSAGE-----\r?$" nil t)
 415       (error "Cannot find signed begin line"))
 416     (goto-char (match-beginning 0))
 417     (forward-line 1)
 418     (unless (looking-at "Hash:[ \t]*\\([a-zA-Z0-9]+\\)")
 419       (error "Cannot not find PGP hash"))
 420     (setq hash (match-string 1))
 421     (unless (re-search-forward "^$" nil t)
 422       (error "Cannot not find PGP message"))
 423     (forward-line 1)
 424     (delete-region (point-min) (point))
 425     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 426                     boundary))
 427     (insert (format "\tmicalg=pgp-%s; protocol=\"application/pgp-signature\"\n"
 428                     (downcase hash)))
 429     (insert (format "\n--%s\n" boundary))
 430     (setq point (point))
 431     (goto-char (point-max))
 432     (unless (re-search-backward "^-----END PGP SIGNATURE-----\r?$" nil t)
 433       (error "Cannot find signature part"))
 434     (replace-match "-----END PGP MESSAGE-----" t t)
 435     (goto-char (match-beginning 0))
 436     (unless (re-search-backward "^-----BEGIN PGP SIGNATURE-----\r?$"
 437                                 nil t)
 438       (error "Cannot find signature part"))
 439     (replace-match "-----BEGIN PGP MESSAGE-----" t t)
 440     (goto-char (match-beginning 0))
 441     (save-restriction
 442       (narrow-to-region point (point))
 443       (goto-char point)
 444       (while (re-search-forward "^- -" nil t)
 445         (replace-match "-" t t))
 446       (goto-char (point-max)))
 447     (insert (format "--%s\n" boundary))
 448     (insert "Content-Type: application/pgp-signature\n\n")
 449     (goto-char (point-max))
 450     (insert (format "--%s--\n" boundary))
 451     (goto-char (point-max))))
 452
 453 ;; We require mm-decode, which requires mm-bodies, which autoloads
 454 ;; message-options-get (!).
 455 (declare-function message-options-set "message" (symbol value))
 456
 457 (defun mml2015-mailcrypt-encrypt (cont &optional sign)
 458   (let ((mc-pgp-always-sign
 459          (or mc-pgp-always-sign
 460              sign
 461              (eq t (or (message-options-get 'message-sign-encrypt)
 462                        (message-options-set
 463                         'message-sign-encrypt
 464                         (or (y-or-n-p "Sign the message? ")
 465                             'not))))
 466              'never)))
 467     (mm-with-unibyte-current-buffer
 468       (mc-encrypt-generic
 469        (or (message-options-get 'message-recipients)
 470            (message-options-set 'message-recipients
 471                               (mc-cleanup-recipient-headers
 472                                (read-string "Recipients: "))))
 473        nil nil nil
 474        (message-options-get 'message-sender))))
 475   (goto-char (point-min))
 476   (unless (looking-at "-----BEGIN PGP MESSAGE-----")
 477     (error "Fail to encrypt the message"))
 478   (let ((boundary (mml-compute-boundary cont)))
 479     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 480                     boundary))
 481     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 482     (insert (format "--%s\n" boundary))
 483     (insert "Content-Type: application/pgp-encrypted\n\n")
 484     (insert "Version: 1\n\n")
 485     (insert (format "--%s\n" boundary))
 486     (insert "Content-Type: application/octet-stream\n\n")
 487     (goto-char (point-max))
 488     (insert (format "--%s--\n" boundary))
 489     (goto-char (point-max))))
 490
 491 ;;; pgg wrapper
 492
 493 (defvar pgg-default-user-id)
 494 (defvar pgg-errors-buffer)
 495 (defvar pgg-output-buffer)
 496
 497 (autoload 'pgg-decrypt-region "pgg")
 498 (autoload 'pgg-verify-region "pgg")
 499 (autoload 'pgg-sign-region "pgg")
 500 (autoload 'pgg-encrypt-region "pgg")
 501 (autoload 'pgg-parse-armor "pgg-parse")
 502
 503 (defun mml2015-pgg-decrypt (handle ctl)
 504   (catch 'error
 505     (let ((pgg-errors-buffer mml2015-result-buffer)
 506           child handles result decrypt-status)
 507       (unless (setq child (mm-find-part-by-type
 508                            (cdr handle)
 509                            "application/octet-stream" nil t))
 510         (mm-set-handle-multipart-parameter
 511          mm-security-handle 'gnus-info "Corrupted")
 512         (throw 'error handle))
 513       (with-temp-buffer
 514         (mm-insert-part child)
 515         (if (condition-case err
 516                 (prog1
 517                     (pgg-decrypt-region (point-min) (point-max))
 518                   (setq decrypt-status
 519                         (with-current-buffer mml2015-result-buffer
 520                           (buffer-string)))
 521                   (mm-set-handle-multipart-parameter
 522                    mm-security-handle 'gnus-details
 523                    decrypt-status))
 524               (error
 525                (mm-set-handle-multipart-parameter
 526                 mm-security-handle 'gnus-details (mml2015-format-error err))
 527                nil)
 528               (quit
 529                (mm-set-handle-multipart-parameter
 530                 mm-security-handle 'gnus-details "Quit.")
 531                nil))
 532             (with-current-buffer pgg-output-buffer
 533               (goto-char (point-min))
 534               (while (search-forward "\r\n" nil t)
 535                 (replace-match "\n" t t))
 536               (setq handles (mm-dissect-buffer t))
 537               (mm-destroy-parts handle)
 538               (mm-set-handle-multipart-parameter
 539                mm-security-handle 'gnus-info "OK")
 540               (mm-set-handle-multipart-parameter
 541                mm-security-handle 'gnus-details
 542                (concat decrypt-status
 543                        (when (stringp (car handles))
 544                          "\n" (mm-handle-multipart-ctl-parameter
 545                                handles 'gnus-details))))
 546               (if (listp (car handles))
 547                   handles
 548                 (list handles)))
 549           (mm-set-handle-multipart-parameter
 550            mm-security-handle 'gnus-info "Failed")
 551           (throw 'error handle))))))
 552
 553 (defun mml2015-pgg-clear-decrypt ()
 554   (let ((pgg-errors-buffer mml2015-result-buffer))
 555     (if (prog1
 556             (pgg-decrypt-region (point-min) (point-max))
 557           (mm-set-handle-multipart-parameter
 558            mm-security-handle 'gnus-details
 559            (with-current-buffer mml2015-result-buffer
 560              (buffer-string))))
 561         (progn
 562           (erase-buffer)
 563           ;; Treat data which pgg returns as a unibyte string.
 564           (mm-disable-multibyte)
 565           (insert-buffer-substring pgg-output-buffer)
 566           (goto-char (point-min))
 567           (while (search-forward "\r\n" nil t)
 568             (replace-match "\n" t t))
 569           (mm-set-handle-multipart-parameter
 570            mm-security-handle 'gnus-info "OK"))
 571       (mm-set-handle-multipart-parameter
 572        mm-security-handle 'gnus-info "Failed"))))
 573
 574 (defun mml2015-pgg-verify (handle ctl)
 575   (let ((pgg-errors-buffer mml2015-result-buffer)
 576         signature-file part signature)
 577     (if (or (null (setq part (mm-find-raw-part-by-type
 578                               ctl (or (mm-handle-multipart-ctl-parameter
 579                                        ctl 'protocol)
 580                                       "application/pgp-signature")
 581                               t)))
 582             (null (setq signature (mm-find-part-by-type
 583                                    (cdr handle) "application/pgp-signature" nil t))))
 584         (progn
 585           (mm-set-handle-multipart-parameter
 586            mm-security-handle 'gnus-info "Corrupted")
 587           handle)
 588       (with-temp-buffer
 589         (insert part)
 590         ;; Convert <LF> to <CR><LF> in signed text.  If --textmode is
 591         ;; specified when signing, the conversion is not necessary.
 592         (goto-char (point-min))
 593         (end-of-line)
 594         (while (not (eobp))
 595           (unless (eq (char-before) ?\r)
 596             (insert "\r"))
 597           (forward-line)
 598           (end-of-line))
 599         (with-temp-file (setq signature-file (mm-make-temp-file "pgg"))
 600           (mm-insert-part signature))
 601         (if (condition-case err
 602                 (prog1
 603                     (pgg-verify-region (point-min) (point-max)
 604                                        signature-file t)
 605                   (goto-char (point-min))
 606                   (while (search-forward "\r\n" nil t)
 607                     (replace-match "\n" t t))
 608                   (mm-set-handle-multipart-parameter
 609                    mm-security-handle 'gnus-details
 610                    (concat (with-current-buffer pgg-output-buffer
 611                              (buffer-string))
 612                            (with-current-buffer pgg-errors-buffer
 613                              (buffer-string)))))
 614               (error
 615                (mm-set-handle-multipart-parameter
 616                 mm-security-handle 'gnus-details (mml2015-format-error err))
 617                nil)
 618               (quit
 619                (mm-set-handle-multipart-parameter
 620                 mm-security-handle 'gnus-details "Quit.")
 621                nil))
 622             (progn
 623               (delete-file signature-file)
 624               (mm-set-handle-multipart-parameter
 625                mm-security-handle 'gnus-info
 626                (with-current-buffer pgg-errors-buffer
 627                  (mml2015-gpg-extract-signature-details))))
 628           (delete-file signature-file)
 629           (mm-set-handle-multipart-parameter
 630            mm-security-handle 'gnus-info "Failed")))))
 631   handle)
 632
 633 (defun mml2015-pgg-clear-verify ()
 634   (let ((pgg-errors-buffer mml2015-result-buffer)
 635         (text (buffer-string))
 636         (coding-system buffer-file-coding-system))
 637     (if (condition-case err
 638             (prog1
 639                 (mm-with-unibyte-buffer
 640                   (insert (mm-encode-coding-string text coding-system))
 641                   (pgg-verify-region (point-min) (point-max) nil t))
 642               (goto-char (point-min))
 643               (while (search-forward "\r\n" nil t)
 644                 (replace-match "\n" t t))
 645               (mm-set-handle-multipart-parameter
 646                mm-security-handle 'gnus-details
 647                (concat (with-current-buffer pgg-output-buffer
 648                          (buffer-string))
 649                        (with-current-buffer pgg-errors-buffer
 650                          (buffer-string)))))
 651           (error
 652            (mm-set-handle-multipart-parameter
 653             mm-security-handle 'gnus-details (mml2015-format-error err))
 654            nil)
 655           (quit
 656            (mm-set-handle-multipart-parameter
 657             mm-security-handle 'gnus-details "Quit.")
 658            nil))
 659         (mm-set-handle-multipart-parameter
 660          mm-security-handle 'gnus-info
 661          (with-current-buffer pgg-errors-buffer
 662            (mml2015-gpg-extract-signature-details)))
 663       (mm-set-handle-multipart-parameter
 664        mm-security-handle 'gnus-info "Failed")))
 665   (mml2015-extract-cleartext-signature))
 666
 667 (defun mml2015-pgg-sign (cont)
 668   (let ((pgg-errors-buffer mml2015-result-buffer)
 669         (boundary (mml-compute-boundary cont))
 670         (pgg-default-user-id (or (message-options-get 'mml-sender)
 671                                  pgg-default-user-id))
 672         (pgg-text-mode t)
 673         entry)
 674     (unless (pgg-sign-region (point-min) (point-max))
 675       (pop-to-buffer mml2015-result-buffer)
 676       (error "Sign error"))
 677     (goto-char (point-min))
 678     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 679                     boundary))
 680     (if (setq entry (assq 2 (pgg-parse-armor
 681                              (with-current-buffer pgg-output-buffer
 682                                (buffer-string)))))
 683         (setq entry (assq 'hash-algorithm (cdr entry))))
 684     (insert (format "\tmicalg=%s; "
 685                     (if (cdr entry)
 686                         (downcase (format "pgp-%s" (cdr entry)))
 687                       "pgp-sha1")))
 688     (insert "protocol=\"application/pgp-signature\"\n")
 689     (insert (format "\n--%s\n" boundary))
 690     (goto-char (point-max))
 691     (insert (format "\n--%s\n" boundary))
 692     (insert "Content-Type: application/pgp-signature\n\n")
 693     (insert-buffer-substring pgg-output-buffer)
 694     (goto-char (point-max))
 695     (insert (format "--%s--\n" boundary))
 696     (goto-char (point-max))))
 697
 698 (defun mml2015-pgg-encrypt (cont &optional sign)
 699   (let ((pgg-errors-buffer mml2015-result-buffer)
 700         (pgg-text-mode t)
 701         (boundary (mml-compute-boundary cont)))
 702     (unless (pgg-encrypt-region (point-min) (point-max)
 703                                 (split-string
 704                                  (or
 705                                   (message-options-get 'message-recipients)
 706                                   (message-options-set 'message-recipients
 707                                                        (read-string "Recipients: ")))
 708                                  "[ \f\t\n\r\v,]+")
 709                                 sign)
 710       (pop-to-buffer mml2015-result-buffer)
 711       (error "Encrypt error"))
 712     (delete-region (point-min) (point-max))
 713     (goto-char (point-min))
 714     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 715                     boundary))
 716     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 717     (insert (format "--%s\n" boundary))
 718     (insert "Content-Type: application/pgp-encrypted\n\n")
 719     (insert "Version: 1\n\n")
 720     (insert (format "--%s\n" boundary))
 721     (insert "Content-Type: application/octet-stream\n\n")
 722     (insert-buffer-substring pgg-output-buffer)
 723     (goto-char (point-max))
 724     (insert (format "--%s--\n" boundary))
 725     (goto-char (point-max))))
 726
 727 ;;; epg wrapper
 728
 729 (defvar epg-user-id-alist)
 730 (defvar epg-digest-algorithm-alist)
 731 (defvar inhibit-redisplay)
 732
 733 (autoload 'epg-make-context "epg")
 734 (autoload 'epg-context-set-armor "epg")
 735 (autoload 'epg-context-set-textmode "epg")
 736 (autoload 'epg-context-set-signers "epg")
 737 (autoload 'epg-context-result-for "epg")
 738 (autoload 'epg-new-signature-digest-algorithm "epg")
 739 (autoload 'epg-verify-result-to-string "epg")
 740 (autoload 'epg-list-keys "epg")
 741 (autoload 'epg-decrypt-string "epg")
 742 (autoload 'epg-verify-string "epg")
 743 (autoload 'epg-sign-string "epg")
 744 (autoload 'epg-encrypt-string "epg")
 745 (autoload 'epg-passphrase-callback-function "epg")
 746 (autoload 'epg-context-set-passphrase-callback "epg")
 747 (autoload 'epg-key-sub-key-list "epg")
 748 (autoload 'epg-sub-key-capability "epg")
 749 (autoload 'epg-sub-key-validity "epg")
 750 (autoload 'epg-sub-key-fingerprint "epg")
 751 (autoload 'epg-configuration "epg-config")
 752 (autoload 'epg-expand-group "epg-config")
 753 (autoload 'epa-select-keys "epa")
 754
 755 (defvar mml2015-epg-secret-key-id-list nil)
 756
 757 (defun mml2015-epg-passphrase-callback (context key-id ignore)
 758   (if (eq key-id 'SYM)
 759       (epg-passphrase-callback-function context key-id nil)
 760     (let* ((password-cache-key-id
 761             (if (eq key-id 'PIN)
 762                 "PIN"
 763                key-id))
 764            entry
 765            (passphrase
 766             (password-read
 767              (if (eq key-id 'PIN)
 768                  "Passphrase for PIN: "
 769                (if (setq entry (assoc key-id epg-user-id-alist))
 770                    (format "Passphrase for %s %s: " key-id (cdr entry))
 771                  (format "Passphrase for %s: " key-id)))
 772              password-cache-key-id)))
 773       (when passphrase
 774         (let ((password-cache-expiry mml2015-passphrase-cache-expiry))
 775           (password-cache-add password-cache-key-id passphrase))
 776         (setq mml2015-epg-secret-key-id-list
 777               (cons password-cache-key-id mml2015-epg-secret-key-id-list))
 778         (copy-sequence passphrase)))))
 779
 780 (defun mml2015-epg-find-usable-key (keys usage)
 781   (catch 'found
 782     (while keys
 783       (let ((pointer (epg-key-sub-key-list (car keys))))
 784         (while pointer
 785           (if (and (memq usage (epg-sub-key-capability (car pointer)))
 786                    (not (memq 'disabled (epg-sub-key-capability (car pointer))))
 787                    (not (memq (epg-sub-key-validity (car pointer))
 788                               '(revoked expired))))
 789               (throw 'found (car keys)))
 790           (setq pointer (cdr pointer))))
 791       (setq keys (cdr keys)))))
 792
 793 ;; XXX: since gpg --list-secret-keys does not return validity of each
 794 ;; key, `mml2015-epg-find-usable-key' defined above is not enough for
 795 ;; secret keys.  The function `mml2015-epg-find-usable-secret-key'
 796 ;; below looks at appropriate public keys to check usability.
 797 (defun mml2015-epg-find-usable-secret-key (context name usage)
 798   (let ((secret-keys (epg-list-keys context name t))
 799         secret-key)
 800     (while (and (not secret-key) secret-keys)
 801       (if (mml2015-epg-find-usable-key
 802            (epg-list-keys context (epg-sub-key-fingerprint
 803                                    (car (epg-key-sub-key-list
 804                                          (car secret-keys)))))
 805            usage)
 806           (setq secret-key (car secret-keys)
 807                 secret-keys nil)
 808         (setq secret-keys (cdr secret-keys))))
 809     secret-key))
 810
 811 (defun mml2015-epg-decrypt (handle ctl)
 812   (catch 'error
 813     (let ((inhibit-redisplay t)
 814           context plain child handles result decrypt-status)
 815       (unless (setq child (mm-find-part-by-type
 816                            (cdr handle)
 817                            "application/octet-stream" nil t))
 818         (mm-set-handle-multipart-parameter
 819          mm-security-handle 'gnus-info "Corrupted")
 820         (throw 'error handle))
 821       (setq context (epg-make-context))
 822       (if mml2015-cache-passphrase
 823           (epg-context-set-passphrase-callback
 824            context
 825            #'mml2015-epg-passphrase-callback))
 826       (condition-case error
 827           (setq plain (epg-decrypt-string context (mm-get-part child))
 828                 mml2015-epg-secret-key-id-list nil)
 829         (error
 830          (while mml2015-epg-secret-key-id-list
 831            (password-cache-remove (car mml2015-epg-secret-key-id-list))
 832            (setq mml2015-epg-secret-key-id-list
 833                  (cdr mml2015-epg-secret-key-id-list)))
 834          (mm-set-handle-multipart-parameter
 835           mm-security-handle 'gnus-info "Failed")
 836          (if (eq (car error) 'quit)
 837              (mm-set-handle-multipart-parameter
 838               mm-security-handle 'gnus-details "Quit.")
 839            (mm-set-handle-multipart-parameter
 840             mm-security-handle 'gnus-details (mml2015-format-error error)))
 841          (throw 'error handle)))
 842       (with-temp-buffer
 843         (insert plain)
 844         (goto-char (point-min))
 845         (while (search-forward "\r\n" nil t)
 846           (replace-match "\n" t t))
 847         (setq handles (mm-dissect-buffer t))
 848         (mm-destroy-parts handle)
 849         (if (epg-context-result-for context 'verify)
 850             (mm-set-handle-multipart-parameter
 851              mm-security-handle 'gnus-info
 852              (concat "OK\n"
 853                      (epg-verify-result-to-string
 854                       (epg-context-result-for context 'verify))))
 855           (mm-set-handle-multipart-parameter
 856            mm-security-handle 'gnus-info "OK"))
 857         (if (stringp (car handles))
 858             (mm-set-handle-multipart-parameter
 859              mm-security-handle 'gnus-details
 860              (mm-handle-multipart-ctl-parameter handles 'gnus-details))))
 861         (if (listp (car handles))
 862             handles
 863           (list handles)))))
 864
 865 (defun mml2015-epg-clear-decrypt ()
 866   (let ((inhibit-redisplay t)
 867         (context (epg-make-context))
 868         plain)
 869     (if mml2015-cache-passphrase
 870         (epg-context-set-passphrase-callback
 871          context
 872          #'mml2015-epg-passphrase-callback))
 873     (condition-case error
 874         (setq plain (epg-decrypt-string context (buffer-string))
 875               mml2015-epg-secret-key-id-list nil)
 876       (error
 877        (while mml2015-epg-secret-key-id-list
 878          (password-cache-remove (car mml2015-epg-secret-key-id-list))
 879          (setq mml2015-epg-secret-key-id-list
 880                (cdr mml2015-epg-secret-key-id-list)))
 881        (mm-set-handle-multipart-parameter
 882         mm-security-handle 'gnus-info "Failed")
 883        (if (eq (car error) 'quit)
 884            (mm-set-handle-multipart-parameter
 885             mm-security-handle 'gnus-details "Quit.")
 886          (mm-set-handle-multipart-parameter
 887           mm-security-handle 'gnus-details (mml2015-format-error error)))))
 888     (when plain
 889       (erase-buffer)
 890       ;; Treat data which epg returns as a unibyte string.
 891       (mm-disable-multibyte)
 892       (insert plain)
 893       (goto-char (point-min))
 894       (while (search-forward "\r\n" nil t)
 895         (replace-match "\n" t t))
 896       (mm-set-handle-multipart-parameter
 897        mm-security-handle 'gnus-info "OK")
 898       (if (epg-context-result-for context 'verify)
 899           (mm-set-handle-multipart-parameter
 900            mm-security-handle 'gnus-details
 901            (epg-verify-result-to-string
 902             (epg-context-result-for context 'verify)))))))
 903
 904 (defun mml2015-epg-verify (handle ctl)
 905   (catch 'error
 906     (let ((inhibit-redisplay t)
 907           context plain signature-file part signature)
 908       (when (or (null (setq part (mm-find-raw-part-by-type
 909                                   ctl (or (mm-handle-multipart-ctl-parameter
 910                                            ctl 'protocol)
 911                                           "application/pgp-signature")
 912                                   t)))
 913                 (null (setq signature (mm-find-part-by-type
 914                                        (cdr handle) "application/pgp-signature"
 915                                        nil t))))
 916         (mm-set-handle-multipart-parameter
 917          mm-security-handle 'gnus-info "Corrupted")
 918         (throw 'error handle))
 919       (setq part (mm-replace-in-string part "\n" "\r\n" t)
 920             signature (mm-get-part signature)
 921             context (epg-make-context))
 922       (condition-case error
 923           (setq plain (epg-verify-string context signature part))
 924         (error
 925          (mm-set-handle-multipart-parameter
 926           mm-security-handle 'gnus-info "Failed")
 927          (if (eq (car error) 'quit)
 928              (mm-set-handle-multipart-parameter
 929               mm-security-handle 'gnus-details "Quit.")
 930            (mm-set-handle-multipart-parameter
 931             mm-security-handle 'gnus-details (mml2015-format-error error)))
 932          (throw 'error handle)))
 933       (mm-set-handle-multipart-parameter
 934        mm-security-handle 'gnus-info
 935        (epg-verify-result-to-string (epg-context-result-for context 'verify)))
 936       handle)))
 937
 938 (defun mml2015-epg-clear-verify ()
 939   (let ((inhibit-redisplay t)
 940         (context (epg-make-context))
 941         (signature (mm-encode-coding-string (buffer-string)
 942                                             coding-system-for-write))
 943         plain)
 944     (condition-case error
 945         (setq plain (epg-verify-string context signature))
 946       (error
 947        (mm-set-handle-multipart-parameter
 948         mm-security-handle 'gnus-info "Failed")
 949        (if (eq (car error) 'quit)
 950            (mm-set-handle-multipart-parameter
 951             mm-security-handle 'gnus-details "Quit.")
 952          (mm-set-handle-multipart-parameter
 953           mm-security-handle 'gnus-details (mml2015-format-error error)))))
 954     (if plain
 955         (progn
 956           (mm-set-handle-multipart-parameter
 957            mm-security-handle 'gnus-info
 958            (epg-verify-result-to-string
 959             (epg-context-result-for context 'verify)))
 960           (delete-region (point-min) (point-max))
 961           (insert (mm-decode-coding-string plain coding-system-for-read)))
 962       (mml2015-extract-cleartext-signature))))
 963
 964 (defun mml2015-epg-sign (cont)
 965   (let* ((inhibit-redisplay t)
 966          (context (epg-make-context))
 967          (boundary (mml-compute-boundary cont))
 968          (sender (when mml2015-sign-with-sender
 969                    (message-options-get 'message-sender)))
 970          signer-key
 971          (signers
 972           (or (message-options-get 'mml2015-epg-signers)
 973               (message-options-set
 974                'mml2015-epg-signers
 975                (if (eq mm-sign-option 'guided)
 976                    (epa-select-keys context "\
 977 Select keys for signing.
 978 If no one is selected, default secret key is used.  "
 979                                     (if sender
 980                                         (cons (concat "<" sender ">")
 981                                               mml2015-signers)
 982                                       mml2015-signers)
 983                                     t)
 984                  (if (or sender mml2015-signers)
 985                      (delq nil
 986                            (mapcar
 987                             (lambda (signer)
 988                               (setq signer-key
 989                                     (mml2015-epg-find-usable-secret-key
 990                                      context signer 'sign))
 991                               (unless (or signer-key
 992                                           (y-or-n-p
 993                                            (format
 994                                             "No secret key for %s; skip it? "
 995                                             signer)))
 996                                 (error "No secret key for %s" signer))
 997                               signer-key)
 998                             (if sender
 999                                 (cons (concat "<" sender ">")
1000                                       mml2015-signers)
1001                               mml2015-signers))))))))
1002          signature micalg)
1003     (epg-context-set-armor context t)
1004     (epg-context-set-textmode context t)
1005     (epg-context-set-signers context signers)
1006     (if mml2015-cache-passphrase
1007         (epg-context-set-passphrase-callback
1008          context
1009          #'mml2015-epg-passphrase-callback))
1010     (condition-case error
1011         (setq signature (epg-sign-string context (buffer-string) t)
1012               mml2015-epg-secret-key-id-list nil)
1013       (error
1014        (while mml2015-epg-secret-key-id-list
1015          (password-cache-remove (car mml2015-epg-secret-key-id-list))
1016          (setq mml2015-epg-secret-key-id-list
1017                (cdr mml2015-epg-secret-key-id-list)))
1018        (signal (car error) (cdr error))))
1019     (if (epg-context-result-for context 'sign)
1020         (setq micalg (epg-new-signature-digest-algorithm
1021                       (car (epg-context-result-for context 'sign)))))
1022     (goto-char (point-min))
1023     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
1024                     boundary))
1025     (if micalg
1026         (insert (format "\tmicalg=pgp-%s; "
1027                         (downcase
1028                          (cdr (assq micalg
1029                                     epg-digest-algorithm-alist))))))
1030     (insert "protocol=\"application/pgp-signature\"\n")
1031     (insert (format "\n--%s\n" boundary))
1032     (goto-char (point-max))
1033     (insert (format "\n--%s\n" boundary))
1034     (insert "Content-Type: application/pgp-signature\n\n")
1035     (insert signature)
1036     (goto-char (point-max))
1037     (insert (format "--%s--\n" boundary))
1038     (goto-char (point-max))))
1039
1040 (defun mml2015-epg-encrypt (cont &optional sign)
1041   (let ((inhibit-redisplay t)
1042         (context (epg-make-context))
1043         (config (epg-configuration))
1044         (sender (when mml2015-sign-with-sender
1045                   (message-options-get 'message-sender)))
1046         (recipients (message-options-get 'mml2015-epg-recipients))
1047         cipher signers
1048         (boundary (mml-compute-boundary cont))
1049         recipient-key signer-key)
1050     (unless recipients
1051       (setq recipients
1052             (apply #'nconc
1053                    (mapcar
1054                     (lambda (recipient)
1055                       (or (epg-expand-group config recipient)
1056                           (list (concat "<" recipient ">"))))
1057                     (split-string
1058                      (or (message-options-get 'message-recipients)
1059                          (message-options-set 'message-recipients
1060                                               (read-string "Recipients: ")))
1061                      "[ \f\t\n\r\v,]+"))))
1062       (when mml2015-encrypt-to-self
1063         (unless (or sender mml2015-signers)
1064           (error "Message sender and mml2015-signers not set"))
1065         (setq recipients (nconc recipients (if sender
1066                                                (cons (concat "<" sender ">")
1067                                                      mml2015-signers)
1068                                              mml2015-signers))))
1069       (if (eq mm-encrypt-option 'guided)
1070           (setq recipients
1071                 (epa-select-keys context "\
1072 Select recipients for encryption.
1073 If no one is selected, symmetric encryption will be performed.  "
1074                                  recipients))
1075         (setq recipients
1076               (delq nil
1077                     (mapcar
1078                      (lambda (recipient)
1079                        (setq recipient-key (mml2015-epg-find-usable-key
1080                                             (epg-list-keys context recipient)
1081                                             'encrypt))
1082                        (unless (or recipient-key
1083                                    (y-or-n-p
1084                                     (format "No public key for %s; skip it? "
1085                                             recipient)))
1086                          (error "No public key for %s" recipient))
1087                        recipient-key)
1088                      recipients)))
1089         (unless recipients
1090           (error "No recipient specified")))
1091       (message-options-set 'mml2015-epg-recipients recipients))
1092     (when sign
1093       (setq signers
1094             (or (message-options-get 'mml2015-epg-signers)
1095                 (message-options-set
1096                  'mml2015-epg-signers
1097                  (if (eq mm-sign-option 'guided)
1098                      (epa-select-keys context "\
1099 Select keys for signing.
1100 If no one is selected, default secret key is used.  "
1101                                       (if sender
1102                                           (cons (concat "<" sender ">")
1103                                                 mml2015-signers)
1104                                         mml2015-signers)
1105                                       t)
1106                    (if (or sender mml2015-signers)
1107                        (delq nil
1108                              (mapcar
1109                               (lambda (signer)
1110                                 (setq signer-key
1111                                       (mml2015-epg-find-usable-secret-key
1112                                        context signer 'sign))
1113                                 (unless (or signer-key
1114                                             (y-or-n-p
1115                                              (format
1116                                               "No secret key for %s; skip it? "
1117                                               signer)))
1118                                   (error "No secret key for %s" signer))
1119                                 signer-key)
1120                               (if sender
1121                                   (cons (concat "<" sender ">") mml2015-signers)
1122                                 mml2015-signers))))))))
1123       (epg-context-set-signers context signers))
1124     (epg-context-set-armor context t)
1125     (epg-context-set-textmode context t)
1126     (if mml2015-cache-passphrase
1127         (epg-context-set-passphrase-callback
1128          context
1129          #'mml2015-epg-passphrase-callback))
1130     (condition-case error
1131         (setq cipher
1132               (epg-encrypt-string context (buffer-string) recipients sign
1133                                   mml2015-always-trust)
1134               mml2015-epg-secret-key-id-list nil)
1135       (error
1136        (while mml2015-epg-secret-key-id-list
1137          (password-cache-remove (car mml2015-epg-secret-key-id-list))
1138          (setq mml2015-epg-secret-key-id-list
1139                (cdr mml2015-epg-secret-key-id-list)))
1140        (signal (car error) (cdr error))))
1141     (delete-region (point-min) (point-max))
1142     (goto-char (point-min))
1143     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
1144                     boundary))
1145     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
1146     (insert (format "--%s\n" boundary))
1147     (insert "Content-Type: application/pgp-encrypted\n\n")
1148     (insert "Version: 1\n\n")
1149     (insert (format "--%s\n" boundary))
1150     (insert "Content-Type: application/octet-stream\n\n")
1151     (insert cipher)
1152     (goto-char (point-max))
1153     (insert (format "--%s--\n" boundary))
1154     (goto-char (point-max))))
1155
1156 ;;; General wrapper
1157
1158 (autoload 'gnus-buffer-live-p "gnus-util")
1159 (autoload 'gnus-get-buffer-create "gnus")
1160
1161 (defun mml2015-clean-buffer ()
1162   (if (gnus-buffer-live-p mml2015-result-buffer)
1163       (with-current-buffer mml2015-result-buffer
1164         (erase-buffer)
1165         t)
1166     (setq mml2015-result-buffer
1167           (gnus-get-buffer-create " *MML2015 Result*"))
1168     nil))
1169
1170 (defsubst mml2015-clear-decrypt-function ()
1171   (nth 6 (assq mml2015-use mml2015-function-alist)))
1172
1173 (defsubst mml2015-clear-verify-function ()
1174   (nth 5 (assq mml2015-use mml2015-function-alist)))
1175
1176 ;;;###autoload
1177 (defun mml2015-decrypt (handle ctl)
1178   (mml2015-clean-buffer)
1179   (let ((func (nth 4 (assq mml2015-use mml2015-function-alist))))
1180     (if func
1181         (funcall func handle ctl)
1182       handle)))
1183
1184 ;;;###autoload
1185 (defun mml2015-decrypt-test (handle ctl)
1186   mml2015-use)
1187
1188 ;;;###autoload
1189 (defun mml2015-verify (handle ctl)
1190   (mml2015-clean-buffer)
1191   (let ((func (nth 3 (assq mml2015-use mml2015-function-alist))))
1192     (if func
1193         (funcall func handle ctl)
1194       handle)))
1195
1196 ;;;###autoload
1197 (defun mml2015-verify-test (handle ctl)
1198   mml2015-use)
1199
1200 ;;;###autoload
1201 (defun mml2015-encrypt (cont &optional sign)
1202   (mml2015-clean-buffer)
1203   (let ((func (nth 2 (assq mml2015-use mml2015-function-alist))))
1204     (if func
1205         (funcall func cont sign)
1206       (error "Cannot find encrypt function"))))
1207
1208 ;;;###autoload
1209 (defun mml2015-sign (cont)
1210   (mml2015-clean-buffer)
1211   (let ((func (nth 1 (assq mml2015-use mml2015-function-alist))))
1212     (if func
1213         (funcall func cont)
1214       (error "Cannot find sign function"))))
1215
1216 ;;;###autoload
1217 (defun mml2015-self-encrypt ()
1218   (mml2015-encrypt nil))
1219
1220 (provide 'mml2015)
1221
1222 ;;; mml2015.el ends here