2 * Copyright notice from original mutt:
3 * Copyright (C) 2001 Thomas Roessler <roessler@does-not-exist.org>
5 * This file is part of mutt-ng, see http://www.muttng.org/.
6 * It's licensed under the GNU General Public License,
7 * please see the file GPL in the top level source directory.
10 /* This module peeks at a PGP signature and figures out the hash
20 #include "pgppacket.h"
29 #include "lib/debug.h"
34 } HashAlgorithms[] = {
38 3, "pgp-ripemd160"}, {
41 7, "pgp-haval-5-160"}, {
48 static const char *pgp_hash_to_micalg (short id)
52 for (i = 0; HashAlgorithms[i].id >= 0; i++)
53 if (HashAlgorithms[i].id == id)
54 return HashAlgorithms[i].name;
58 static void pgp_dearmor (FILE * in, FILE * out)
60 char line[HUGE_STRING];
67 memset (&state, 0, sizeof (STATE));
71 /* find the beginning of ASCII armor */
73 while ((r = fgets (line, sizeof (line), in)) != NULL) {
74 if (!strncmp (line, "-----BEGIN", 10))
78 debug_print (1, ("Can't find begin of ASCII armor.\n"));
82 /* skip the armor header */
84 while ((r = fgets (line, sizeof (line), in)) != NULL) {
90 debug_print (1, ("Armor header doesn't end.\n"));
94 /* actual data starts here */
97 /* find the checksum */
99 while ((r = fgets (line, sizeof (line), in)) != NULL) {
100 if (*line == '=' || !strncmp (line, "-----END", 8))
104 debug_print (1, ("Can't find end of ASCII armor.\n"));
108 if ((end = ftell (in) - mutt_strlen (line)) < start) {
109 debug_print (1, ("end < start???\n"));
113 if (fseek (in, start, SEEK_SET) == -1) {
114 debug_print (1, ("Can't seekto start.\n"));
118 mutt_decode_base64 (&state, end - start, 0, (iconv_t) - 1);
121 static short pgp_mic_from_packet (unsigned char *p, size_t len)
124 if ((p[0] & 0x3f) != PT_SIG) {
125 debug_print (1, ("tag = %d, want %d.\n", p[0] & 0x3f, PT_SIG));
129 if (len >= 18 && p[1] == 3)
130 /* version 3 signature */
131 return (short) p[17];
132 else if (len >= 5 && p[1] == 4)
133 /* version 4 signature */
136 debug_print (1, ("Bad signature packet.\n"));
141 static short pgp_find_hash (const char *fname)
146 char tempfile[_POSIX_PATH_MAX];
153 mutt_mktemp (tempfile);
154 if ((out = safe_fopen (tempfile, "w+")) == NULL) {
155 mutt_perror (tempfile);
160 if ((in = fopen (fname, "r")) == NULL) {
165 pgp_dearmor (in, out);
168 if ((p = pgp_read_packet (out, &l)) != NULL) {
169 rv = pgp_mic_from_packet (p, l);
172 debug_print (1, ("No packet.\n"));
179 pgp_release_packet ();
183 const char *pgp_micalg (const char *fname)
185 return pgp_hash_to_micalg (pgp_find_hash (fname));