--- /dev/null
+(defgroup epg ()
+ "EasyPG, yet another GnuPG interface.")
+
+(defcustom epg-gpg-program "gpg"
+ "The `gpg' executable."
+ :group 'epg
+ :type 'string)
+
+(defvar epg-user-id nil
+ "GnuPG ID of your default identity.")
+
+(defvar epg-user-id-alist nil
+ "An alist mapping from key ID to user ID.")
+
+(defvar epg-read-point nil)
+(defvar epg-pending-status-list nil)
+(defvar epg-key-id nil)
+(defvar epg-context nil)
+(defvar epg-debug nil)
+
+(defvar epg-colons-pub-spec
+ '((trust "[^:]")
+ (length "[0-9]+" 0 string-to-number)
+ (algorithm "[0-9]+" 0 string-to-number)
+ (key-id "[^:]+")
+ (creation-date "[0-9]+")
+ (expiration-date "[0-9]+")
+ nil
+ (ownertrust "[^:]")
+ nil
+ nil
+ (capability "[escaESCA]*"))
+ "The schema of keylisting output whose type is \"pub\".
+This is used by `epg-list-keys'.")
+
+(defvar epg-colons-sec-spec
+ '((trust "[^:]")
+ (length "[0-9]+" 0 string-to-number)
+ (algorithm "[0-9]+" 0 string-to-number)
+ (key-id "[^:]+")
+ (creation-date "[0-9]+")
+ (expiration-date "[0-9]+")
+ nil
+ (ownertrust "[^:]"))
+"The schema of keylisting output whose type is \"sec\".
+This is used by `epg-list-keys'.")
+
+(defvar epg-colons-uid-spec
+ '((trust "[^:]")
+ nil
+ nil
+ nil
+ (creation-date "[0-9]+")
+ (expiration-date "[0-9]+")
+ (hash "[^:]+")
+ nil
+ (user-id "[^:]+"))
+ "The schema of keylisting output whose type is \"uid\".
+This is used by `epg-list-keys'.")
+
+(defun epg-make-context (&optional protocol armor textmode include-certs
+ process output-file result)
+ "Return a context object."
+ (vector protocol armor textmode include-certs
+ (list #'epg-passphrase-callback)
+ (list #'epg-progress-callback)
+ nil process output-file result))
+
+(defun epg-context-protocol (context)
+ "Return the protocol used within the context."
+ (aref context 0))
+
+(defun epg-context-armor (context)
+ "Return t if the output shouled be ASCII armored in the CONTEXT context."
+ (aref context 1))
+
+(defun epg-context-textmode (context)
+ "Return t if canonical text mode should be used in the CONTEXT context."
+ (aref context 2))
+
+(defun epg-context-include-certs (context)
+ "Return how many certificates should be included in an S/MIME signed
+message."
+ (aref context 3))
+
+(defun epg-context-passphrase-callback (context)
+ "Return the function used to query passphrase."
+ (aref context 4))
+
+(defun epg-context-progress-callback (context)
+ "Return the function which handles progress update."
+ (aref context 5))
+
+(defun epg-context-signers (context)
+ "Return the list of key-id for singning."
+ (aref context 6))
+
+(defun epg-context-process (context)
+ "Return the process object of `epg-gpg-program'.
+This function is for internal use only."
+ (aref context 7))
+
+(defun epg-context-output-file (context)
+ "Return the output file of `epg-gpg-program'.
+This function is for internal use only."
+ (aref context 8))
+
+(defun epg-context-result (context name)
+ "Return the result of the previous cryptographic operation."
+ (cdr (assq name (aref context 9))))
+
+(defun epg-context-set-protocol (context protocol)
+ "Set the protocol used within the context."
+ (aset context 0 protocol))
+
+(defun epg-context-set-armor (context armor)
+ "Specify if the output shouled be ASCII armored in the CONTEXT context."
+ (aset context 1 armor))
+
+(defun epg-context-set-textmode (context textmode)
+ "Specify if canonical text mode should be used in the CONTEXT context."
+ (aset context 2 textmode))
+
+(defun epg-context-set-include-certs (context include-certs)
+ "Set how many certificates should be included in an S/MIME signed message."
+ (aset context 3 include-certs))
+
+(defun epg-context-set-passphrase-callback (context passphrase-callback
+ &optional handback)
+ "Set the function used to query passphrase."
+ (aset context 4 (cons passphrase-callback handback)))
+
+(defun epg-context-set-progress-callback (context progress-callback
+ &optional handback)
+ "Set the function which handles progress update."
+ (aset context 5 (cons progress-callback handback)))
+
+(defun epg-context-set-signers (context signers)
+ "Set the list of key-id for singning."
+ (aset context 6 signers))
+
+(defun epg-context-set-process (context process)
+ "Set the process object of `epg-gpg-program'.
+This function is for internal use only."
+ (aset context 7 process))
+
+(defun epg-context-set-output-file (context output-file)
+ "Set the output file of `epg-gpg-program'.
+This function is for internal use only."
+ (aset context 8 output-file))
+
+(defun epg-context-set-result (context name result)
+ "Set the result of the previous cryptographic operation."
+ (let ((entry (assq name (aref context 9))))
+ (if entry
+ (setcdr entry result)
+ (aset context 9 (cons (cons name result) (aref context 9))))))
+
+(defun epg-make-signature (status key-id user-id)
+ "Return a signature object."
+ (vector status key-id user-id nil))
+
+(defun epg-signature-status (signature)
+ "Return the status code of SIGNATURE."
+ (aref signature 0))
+
+(defun epg-signature-key-id (signature)
+ "Return the key-id of SIGNATURE."
+ (aref signature 1))
+
+(defun epg-signature-user-id (signature)
+ "Return the user-id of SIGNATURE."
+ (aref signature 2))
+
+(defun epg-signature-validity (signature)
+ "Return the validity of SIGNATURE."
+ (aref signature 3))
+
+(defun epg-signature-set-status (signature status)
+ "Set the status code of SIGNATURE."
+ (aset signature 0 status))
+
+(defun epg-signature-set-key-id (signature key-id)
+ "Set the key-id of SIGNATURE."
+ (aset signature 1 key-id))
+
+(defun epg-signature-set-user-id (signature user-id)
+ "Set the user-id of SIGNATURE."
+ (aset signature 2 user-id))
+
+(defun epg-signature-set-validity (signature validity)
+ "Set the validity of SIGNATURE."
+ (aset signature 3 validity))
+
+(defun epg-start (context args)
+ "Start `epg-gpg-program' in a subprocess with given ARGS."
+ (let* ((args (append (list "--no-tty"
+ "--status-fd" "1"
+ "--command-fd" "0"
+ "--yes") ; overwrite
+ (if (epg-context-armor context) '("--armor"))
+ (if (epg-context-textmode context) '("--textmode"))
+ (if (epg-context-output-file context)
+ (list "--output" (epg-context-output-file context)))
+ args))
+ (coding-system-for-write 'binary)
+ process-connection-type
+ (orig-mode (default-file-modes))
+ (buffer (generate-new-buffer " *epg*"))
+ process)
+ (with-current-buffer buffer
+ (make-local-variable 'epg-read-point)
+ (setq epg-read-point (point-min))
+ (make-local-variable 'epg-pending-status-list)
+ (setq epg-pending-status-list nil)
+ (make-local-variable 'epg-key-id)
+ (setq epg-key-id nil)
+ (make-local-variable 'epg-context)
+ (setq epg-context context))
+ (unwind-protect
+ (progn
+ (set-default-file-modes 448)
+ (setq process
+ (apply #'start-process "epg" buffer epg-gpg-program args)))
+ (set-default-file-modes orig-mode))
+ (set-process-filter process #'epg-process-filter)
+ (epg-context-set-process context process)))
+
+(defun epg-process-filter (process input)
+ (if epg-debug
+ (save-excursion
+ (set-buffer (get-buffer-create " *epg-debug*"))
+ (goto-char (point-max))
+ (insert input)))
+ (if (buffer-live-p (process-buffer process))
+ (save-excursion
+ (set-buffer (process-buffer process))
+ (goto-char (point-max))
+ (insert input)
+ (goto-char epg-read-point)
+ (beginning-of-line)
+ (while (looking-at ".*\n") ;the input line is finished
+ (save-excursion
+ (if (looking-at "\\[GNUPG:] \\([A-Z_]+\\) ?\\(.*\\)")
+ (let* ((status (match-string 1))
+ (string (match-string 2))
+ (symbol (intern-soft (concat "epg-status-" status))))
+ (if (member status epg-pending-status-list)
+ (setq epg-pending-status-list nil))
+ (if (and symbol
+ (fboundp symbol))
+ (funcall symbol process string)))))
+ (forward-line))
+ (setq epg-read-point (point)))))
+
+(defun epg-read-output (context)
+ (with-temp-buffer
+ (set-buffer-multibyte nil)
+ (if (file-exists-p (epg-context-output-file context))
+ (let ((coding-system-for-read (if (epg-context-output-file context)
+ 'raw-text
+ 'binary)))
+ (insert-file-contents (epg-context-output-file context))
+ (buffer-string)))))
+
+(defun epg-wait-for-status (context status-list)
+ (with-current-buffer (process-buffer (epg-context-process context))
+ (setq epg-pending-status-list status-list)
+ (while (and (eq (process-status (epg-context-process context)) 'run)
+ epg-pending-status-list)
+ (accept-process-output (epg-context-process context) 1))))
+
+(defun epg-wait-for-completion (context)
+ (process-send-eof (epg-context-process context))
+ (while (eq (process-status (epg-context-process context)) 'run)
+ ;; We can't use accept-process-output instead of sit-for here
+ ;; because it may cause an interrupt during the sentinel execution.
+ (sit-for 0.1)))
+
+(defun epg-reset (context)
+ (if (and (epg-context-process context)
+ (buffer-live-p (process-buffer (epg-context-process context))))
+ (kill-buffer (process-buffer (epg-context-process context))))
+ (epg-context-set-process context nil)
+ (if (file-exists-p (epg-context-output-file context))
+ (delete-file (epg-context-output-file context)))
+ (aset context 9 nil))
+
+(defun epg-status-USERID_HINT (process string)
+ (if (string-match "\\`\\([^ ]+\\) \\(.*\\)" string)
+ (let* ((key-id (match-string 1 string))
+ (user-id (match-string 2 string))
+ (entry (assoc key-id epg-user-id-alist)))
+ (if entry
+ (setcdr entry user-id)
+ (setq epg-user-id-alist (cons (cons key-id user-id)
+ epg-user-id-alist))))))
+
+(defun epg-status-NEED_PASSPHRASE (process string)
+ (if (string-match "\\`\\([^ ]+\\)" string)
+ (setq epg-key-id (match-string 1 string))))
+
+(defun epg-status-NEED_PASSPHRASE_SYM (process string)
+ (setq epg-key-id 'SYM))
+
+(defun epg-status-NEED_PASSPHRASE_PIN (process string)
+ (setq epg-key-id 'PIN))
+
+(defun epg-status-GET_HIDDEN (process string)
+ (let ((passphrase (funcall
+ (car (epg-context-passphrase-callback epg-context))
+ epg-key-id
+ (cdr (epg-context-passphrase-callback epg-context)))))
+ (unwind-protect
+ (if passphrase
+ (process-send-string process (concat passphrase "\n")))
+ (fillarray passphrase 0))))
+
+(defun epg-status-GOODSIG (process string)
+ (if (string-match "\\`\\([^ ]+\\) \\(.*\\)" string)
+ (epg-context-set-result
+ epg-context
+ 'verify
+ (cons (epg-make-signature 'good
+ (match-string 1 string)
+ (match-string 2 string))
+ (epg-context-result epg-context 'verify)))))
+
+(defun epg-status-EXPSIG (process string)
+ (if (string-match "\\`\\([^ ]+\\) \\(.*\\)" string)
+ (epg-context-set-result
+ epg-context
+ 'verify
+ (cons (epg-make-signature 'expired
+ (match-string 1 string)
+ (match-string 2 string))
+ (epg-context-result epg-context 'verify)))))
+
+(defun epg-status-EXPKEYSIG (process string)
+ (if (string-match "\\`\\([^ ]+\\) \\(.*\\)" string)
+ (epg-context-set-result
+ epg-context
+ 'verify
+ (cons (epg-make-signature 'expired-key
+ (match-string 1 string)
+ (match-string 2 string))
+ (epg-context-result epg-context 'verify)))))
+
+(defun epg-status-REVKEYSIG (process string)
+ (if (string-match "\\`\\([^ ]+\\) \\(.*\\)" string)
+ (epg-context-set-result
+ epg-context
+ 'verify
+ (cons (epg-make-signature 'revoked-key
+ (match-string 1 string)
+ (match-string 2 string))
+ (epg-context-result epg-context 'verify)))))
+
+(defun epg-status-BADSIG (process string)
+ (if (string-match "\\`\\([^ ]+\\) \\(.*\\)" string)
+ (epg-context-set-result
+ epg-context
+ 'verify
+ (cons (epg-make-signature 'bad
+ (match-string 1 string)
+ (match-string 2 string))
+ (epg-context-result epg-context 'verify)))))
+
+(defun epg-status-TRUST_UNDEFINED (process string)
+ (let ((signature (car (epg-context-result epg-context 'verify))))
+ (if (and signature
+ (eq (epg-signature-status signature) 'good))
+ (epg-signature-set-validity signature 'unknown))))
+
+(defun epg-status-TRUST_NEVER (process string)
+ (let ((signature (car (epg-context-result epg-context 'verify))))
+ (if (and signature
+ (eq (epg-signature-status signature) 'good))
+ (epg-signature-set-validity signature 'never))))
+
+(defun epg-status-TRUST_MARGINAL (process string)
+ (let ((signature (car (epg-context-result epg-context 'verify))))
+ (if (and signature
+ (eq (epg-signature-status signature) 'marginal))
+ (epg-signature-set-validity signature 'marginal))))
+
+(defun epg-status-TRUST_FULLY (process string)
+ (let ((signature (car (epg-context-result epg-context 'verify))))
+ (if (and signature
+ (eq (epg-signature-status signature) 'good))
+ (epg-signature-set-validity signature 'full))))
+
+(defun epg-status-TRUST_ULTIMATE (process string)
+ (let ((signature (car (epg-context-result epg-context 'verify))))
+ (if (and signature
+ (eq (epg-signature-status signature) 'good))
+ (epg-signature-set-validity signature 'full))))
+
+(defun epg-status-DECRYPTION_FAILED (process string)
+ (epg-context-set-result epg-context 'decrypt 'failed))
+
+(defun epg-status-PROGRESS (process string)
+ (if (string-match "\\`\\([^ ]+\\) \\([^ ]\\) \\([0-9]+\\) \\([0-9]+\\)"
+ string)
+ (funcall (car (epg-context-progress-callback epg-context))
+ (match-string 1 string)
+ (match-string 2 string)
+ (string-to-number (match-string 3 string))
+ (string-to-number (match-string 4 string)))))
+
+(defun epg-passphrase-callback (key-id handback)
+ (read-passwd
+ (if (eq key-id 'SYM)
+ "GnuPG passphrase for symmetric encryption: "
+ (if (eq key-id 'PIN)
+ "GnuPG passphrase for PIN: "
+ (format "GnuPG passphrase for %s: "
+ (let ((entry (assoc key-id epg-user-id-alist)))
+ (if entry
+ (cdr entry)
+ key-id)))))))
+
+(defun epg-progress-callback (what char current total handback)
+ (message "%s: %d%%/%d%%" what current total))
+
+(defun epg-list-keys (name &optional secret)
+ "List keys associated with STRING."
+ (let ((args (list "--with-colons" "--no-greeting" "--batch"
+ "--fixed-list-mode"
+ (if secret "--list-secret-keys" "--list-keys")
+ name))
+ keys type symbol pointer)
+ (with-temp-buffer
+ (apply #'call-process epg-gpg-program nil (list t nil) nil args)
+ (goto-char (point-min))
+ (while (looking-at "\\([a-z][a-z][a-z]\\):\\(.*\\)")
+ (setq type (match-string 1)
+ symbol (intern-soft (format "epg-colons-%s-spec" type)))
+ (if (member type '("pub" "sec"))
+ (setq keys (cons nil keys)))
+ (if (and symbol
+ (boundp symbol))
+ (setcar keys (cons (cons (intern type)
+ (epg-parse-colons
+ (symbol-value symbol)
+ (match-string 2)))
+ (car keys))))
+ (forward-line)))
+ (setq pointer keys)
+ (while pointer
+ (setcar pointer (nreverse (car pointer)))
+ (setq pointer (cdr pointer)))
+ (nreverse keys)))
+
+(defun epg-parse-colons (alist string)
+ (let ((index 0)
+ result)
+ (while (and alist
+ (or (null (car alist))
+ (eq index
+ (string-match
+ (concat "\\(" (nth 1 (car alist)) "\\)?:")
+ string index))))
+ (if (car alist)
+ (progn
+ (setq index (match-end 0))
+ (if (match-beginning 1)
+ (setq result
+ (cons (cons (car (car alist))
+ (funcall (or (nth 3 (car alist)) #'identity)
+ (match-string
+ (1+ (or (nth 2 (car alist)) 0))
+ string)))
+ result))))
+ (setq index (1+ index)))
+ (setq alist (cdr alist)))
+ (nreverse result)))
+
+;;;###autoload
+(defun epg-decrypt-start (context input-file)
+ "Initiate a decrypt operation."
+ (epg-context-set-output-file context (epg-make-temp-file "epg-output"))
+ (epg-start context
+ (list "--decrypt" input-file))
+ (epg-wait-for-status context '("BEGIN_DECRYPTION")))
+
+;;;###autoload
+(defun epg-decrypt-string (context string)
+ "Decrypt STRING."
+ (let ((input-file (epg-make-temp-file "epg-input"))
+ (coding-system-for-write 'binary))
+ (unwind-protect
+ (progn
+ (write-region string nil input-file)
+ (epg-decrypt-start context input-file)
+ (epg-wait-for-completion context)
+ (unless (epg-context-result context 'decrypt)
+ (epg-read-output context)))
+ (epg-reset context)
+ (if (file-exists-p input-file)
+ (delete-file input-file)))))
+
+;;;###autoload
+(defun epg-verify-start (context signature &optional string)
+ "Initiate a verify operation."
+ (epg-context-set-output-file context (epg-make-temp-file "epg-output"))
+ (if string
+ ;; Detached signature.
+ (progn
+ (epg-start context
+ (append (list "--verify")
+ (list signature "-")))
+ (if (eq (process-status (epg-context-process context)) 'run)
+ (process-send-string (epg-context-process context) string)))
+ ;; Normal (or cleartext) signature.
+ (epg-start context
+ (list "--verify"))
+ (if (eq (process-status (epg-context-process context)) 'run)
+ (process-send-string (epg-context-process context) signature))))
+
+;;;###autoload
+(defun epg-verify-string (context signature &optional string)
+ "Verify SIGNATURE."
+ (let ((input-file (epg-make-temp-file "epg-input"))
+ (coding-system-for-write 'binary))
+ (unwind-protect
+ (progn
+ (if string
+ (write-region signature nil input-file))
+ (epg-verify-start context input-file string)
+ (epg-wait-for-completion context)
+ (epg-context-result context 'verify))
+ (epg-reset context)
+ (if (file-exists-p input-file)
+ (delete-file input-file)))))
+
+;;;###autoload
+(defun epg-sign-start (context string &optional mode)
+ "Initiate a sign operation."
+ (epg-context-set-output-file context (epg-make-temp-file "epg-output"))
+ (epg-start context
+ (append (list (if (null mode)
+ "--sign"
+ (if (or (eq mode t) (eq mode 'detached))
+ "--detach-sign"
+ "--clearsign")))
+ (apply #'nconc
+ (mapcar (lambda (signer)
+ (list "-u" signer))
+ (epg-context-signers context)))))
+ (epg-wait-for-status context '("BEGIN_SIGNING"))
+ (if (eq (process-status (epg-context-process context)) 'run)
+ (process-send-string (epg-context-process context) string)))
+
+;;;###autoload
+(defun epg-sign-string (context string &optional mode)
+ "Sign STRING."
+ (unwind-protect
+ (progn
+ (epg-sign-start context string mode)
+ (epg-wait-for-completion context)
+ (epg-read-output context))
+ (epg-reset context)))
+
+;;;###autoload
+(defun epg-encrypt-start (context string recipients
+ &optional always-trust sign)
+ "Initiate a encrypt operation."
+ (epg-context-set-output-file context (epg-make-temp-file "epg-output"))
+ (epg-start context
+ (append (if always-trust '("--always-trust"))
+ (if recipients '("--encrypt") '("--symmetric"))
+ (if sign
+ (cons "--sign"
+ (apply #'nconc
+ (mapcar (lambda (signer)
+ (list "-u" signer))
+ (epg-context-signers context)))))
+ (apply #'nconc
+ (mapcar (lambda (recipient)
+ (list "-r" recipient))
+ recipients))))
+ (if sign
+ (epg-wait-for-status context '("BEGIN_SIGNING")))
+ (if (eq (process-status (epg-context-process context)) 'run)
+ (process-send-string (epg-context-process context) string)))
+
+;;;###autoload
+(defun epg-encrypt-string (context string recipients
+ &optional always-trust sign)
+ "Encrypt STRING."
+ (unwind-protect
+ (progn
+ (epg-encrypt-start context string recipients always-trust sign)
+ (epg-wait-for-completion context)
+ (epg-read-output context))
+ (epg-reset context)))
+
+(provide 'epg)
+
+;;; epg.el ends here
projects / elisp / epg.git / commitdiff