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86 lines
2.3 KiB
86 lines
2.3 KiB
/* $Id$ |
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* |
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* isync - IMAP4 to maildir mailbox synchronizer |
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* Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include <assert.h> |
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#include "isync.h" |
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#if HAVE_LIBSSL |
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#include <string.h> |
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#include <openssl/hmac.h> |
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#define ENCODED_SIZE(n) (4*((n+2)/3)) |
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static char |
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hexchar (unsigned int b) |
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{ |
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if (b < 10) |
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return '0' + b; |
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return 'a' + (b - 10); |
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} |
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char * |
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cram (const char *challenge, const char *user, const char *pass) |
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{ |
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HMAC_CTX hmac; |
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char hash[16]; |
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char hex[33]; |
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int i; |
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unsigned int hashlen = sizeof (hash); |
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char buf[256]; |
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int len = strlen (challenge); |
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char *response = calloc (1, 1 + len); |
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char *final; |
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/* response will always be smaller than challenge because we are |
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* decoding. |
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*/ |
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len = EVP_DecodeBlock ((unsigned char *) response, (unsigned char *) challenge, strlen (challenge)); |
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// printf ("CRAM-MD5 challege is %s\n", response); |
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HMAC_Init (&hmac, (unsigned char *) pass, strlen (pass), EVP_md5 ()); |
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HMAC_Update (&hmac, (unsigned char *) response, strlen(response)); |
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HMAC_Final (&hmac, (unsigned char *) hash, &hashlen); |
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assert (hashlen == sizeof (hash)); |
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free (response); |
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hex[32] = 0; |
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for (i = 0; i < 16; i++) |
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{ |
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hex[2 * i] = hexchar ((hash[i] >> 4) & 0xf); |
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hex[2 * i + 1] = hexchar (hash[i] & 0xf); |
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} |
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snprintf (buf, sizeof (buf), "%s %s", user, hex); |
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// printf ("Response: %s\n", buf); |
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len = strlen (buf); |
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len = ENCODED_SIZE (len) + 1; |
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final = malloc (len); |
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final[len - 1] = 0; |
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assert (EVP_EncodeBlock ((unsigned char *) final, (unsigned char *) buf, strlen (buf)) == len - 1); |
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return final; |
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} |
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#endif
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