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Diffstat (limited to 'protocols/yahoo/crypt.c')
| -rw-r--r-- | protocols/yahoo/crypt.c | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/protocols/yahoo/crypt.c b/protocols/yahoo/crypt.c deleted file mode 100644 index 5122e3af..00000000 --- a/protocols/yahoo/crypt.c +++ /dev/null @@ -1,203 +0,0 @@ -/* One way encryption based on MD5 sum. - Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -/* warmenhoven took this file and made it work with the md5.[ch] we - * already had. isn't that lovely. people should just use linux or - * freebsd, crypt works properly on those systems. i hate solaris */ - -#if HAVE_STRING_H -# include <string.h> -#elif HAVE_STRINGS_H -# include <strings.h> -#endif - -#include <stdlib.h> -#include "yahoo_util.h" - -#include "md5.h" - -/* Define our magic string to mark salt for MD5 "encryption" - replacement. This is meant to be the same as for other MD5 based - encryption implementations. */ -static const char md5_salt_prefix[] = "$1$"; - -/* Table with characters for base64 transformation. */ -static const char b64t[64] = -"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; - -char *yahoo_crypt(char *key, char *salt) -{ - char *buffer = NULL; - int buflen = 0; - int needed = 3 + strlen (salt) + 1 + 26 + 1; - - md5_byte_t alt_result[16]; - md5_state_t ctx; - md5_state_t alt_ctx; - size_t salt_len; - size_t key_len; - size_t cnt; - char *cp; - - if (buflen < needed) { - buflen = needed; - if ((buffer = realloc(buffer, buflen)) == NULL) - return NULL; - } - - /* Find beginning of salt string. The prefix should normally always - be present. Just in case it is not. */ - if (strncmp (md5_salt_prefix, salt, sizeof (md5_salt_prefix) - 1) == 0) - /* Skip salt prefix. */ - salt += sizeof (md5_salt_prefix) - 1; - - salt_len = MIN (strcspn (salt, "$"), 8); - key_len = strlen (key); - - /* Prepare for the real work. */ - md5_init(&ctx); - - /* Add the key string. */ - md5_append(&ctx, (md5_byte_t *)key, key_len); - - /* Because the SALT argument need not always have the salt prefix we - add it separately. */ - md5_append(&ctx, (md5_byte_t *)md5_salt_prefix, sizeof (md5_salt_prefix) - 1); - - /* The last part is the salt string. This must be at most 8 - characters and it ends at the first `$' character (for - compatibility which existing solutions). */ - md5_append(&ctx, (md5_byte_t *)salt, salt_len); - - /* Compute alternate MD5 sum with input KEY, SALT, and KEY. The - final result will be added to the first context. */ - md5_init(&alt_ctx); - - /* Add key. */ - md5_append(&alt_ctx, (md5_byte_t *)key, key_len); - - /* Add salt. */ - md5_append(&alt_ctx, (md5_byte_t *)salt, salt_len); - - /* Add key again. */ - md5_append(&alt_ctx, (md5_byte_t *)key, key_len); - - /* Now get result of this (16 bytes) and add it to the other - context. */ - md5_finish(&alt_ctx, alt_result); - - /* Add for any character in the key one byte of the alternate sum. */ - for (cnt = key_len; cnt > 16; cnt -= 16) - md5_append(&ctx, alt_result, 16); - md5_append(&ctx, alt_result, cnt); - - /* For the following code we need a NUL byte. */ - alt_result[0] = '\0'; - - /* The original implementation now does something weird: for every 1 - bit in the key the first 0 is added to the buffer, for every 0 - bit the first character of the key. This does not seem to be - what was intended but we have to follow this to be compatible. */ - for (cnt = key_len; cnt > 0; cnt >>= 1) - md5_append(&ctx, (cnt & 1) != 0 ? alt_result : (md5_byte_t *)key, 1); - - /* Create intermediate result. */ - md5_finish(&ctx, alt_result); - - /* Now comes another weirdness. In fear of password crackers here - comes a quite long loop which just processes the output of the - previous round again. We cannot ignore this here. */ - for (cnt = 0; cnt < 1000; ++cnt) { - /* New context. */ - md5_init(&ctx); - - /* Add key or last result. */ - if ((cnt & 1) != 0) - md5_append(&ctx, (md5_byte_t *)key, key_len); - else - md5_append(&ctx, alt_result, 16); - - /* Add salt for numbers not divisible by 3. */ - if (cnt % 3 != 0) - md5_append(&ctx, (md5_byte_t *)salt, salt_len); - - /* Add key for numbers not divisible by 7. */ - if (cnt % 7 != 0) - md5_append(&ctx, (md5_byte_t *)key, key_len); - - /* Add key or last result. */ - if ((cnt & 1) != 0) - md5_append(&ctx, alt_result, 16); - else - md5_append(&ctx, (md5_byte_t *)key, key_len); - - /* Create intermediate result. */ - md5_finish(&ctx, alt_result); - } - - /* Now we can construct the result string. It consists of three - parts. */ - - strncpy(buffer, md5_salt_prefix, MAX (0, buflen)); - cp = buffer + strlen(buffer); - buflen -= sizeof (md5_salt_prefix); - - strncpy(cp, salt, MIN ((size_t) buflen, salt_len)); - cp = cp + strlen(cp); - buflen -= MIN ((size_t) buflen, salt_len); - - if (buflen > 0) { - *cp++ = '$'; - --buflen; - } - -#define b64_from_24bit(B2, B1, B0, N) \ - do { \ - unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0); \ - int n = (N); \ - while (n-- > 0 && buflen > 0) { \ - *cp++ = b64t[w & 0x3f]; \ - --buflen; \ - w >>= 6; \ - }\ - } while (0) - - b64_from_24bit (alt_result[0], alt_result[6], alt_result[12], 4); - b64_from_24bit (alt_result[1], alt_result[7], alt_result[13], 4); - b64_from_24bit (alt_result[2], alt_result[8], alt_result[14], 4); - b64_from_24bit (alt_result[3], alt_result[9], alt_result[15], 4); - b64_from_24bit (alt_result[4], alt_result[10], alt_result[5], 4); - b64_from_24bit (0, 0, alt_result[11], 2); - if (buflen <= 0) { - FREE(buffer); - } else - *cp = '\0'; /* Terminate the string. */ - - /* Clear the buffer for the intermediate result so that people - attaching to processes or reading core dumps cannot get any - information. We do it in this way to clear correct_words[] - inside the MD5 implementation as well. */ - md5_init(&ctx); - md5_finish(&ctx, alt_result); - memset (&ctx, '\0', sizeof (ctx)); - memset (&alt_ctx, '\0', sizeof (alt_ctx)); - - return buffer; -} |