86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* $Id$
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*
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* isync - IMAP4 to maildir mailbox synchronizer
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* Copyright (C) 2000 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 <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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