From 0b3cbf57875fd692e4ba0b336fefa4bee1ed00dc Mon Sep 17 00:00:00 2001 From: Simeon Simeonov Date: Mon, 26 Feb 2018 11:23:00 +0100 Subject: Initial commit for sylpheed 3.7.0 --- libsylph/md5_hmac.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 134 insertions(+) create mode 100644 libsylph/md5_hmac.c (limited to 'libsylph/md5_hmac.c') diff --git a/libsylph/md5_hmac.c b/libsylph/md5_hmac.c new file mode 100644 index 0000000..77ae39e --- /dev/null +++ b/libsylph/md5_hmac.c @@ -0,0 +1,134 @@ +/* + * LibSylph -- E-Mail client library + * Copyright (C) 1999-2006 Hiroyuki Yamamoto + * + * This 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. + * + * This 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 this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include +#include + +#include "md5.h" +#include "md5_hmac.h" + +/* +** Function: md5_hmac_get +** taken from the file rfc2104.txt +** originally written by Martin Schaaf +** rewritten by Hiroyuki Yamamoto +*/ +static SMD5* +md5_hmac_get(const guchar *text, gint text_len, + const guchar *key, gint key_len) +{ + SMD5 *md5; + guchar k_ipad[64]; /* inner padding - + * key XORd with ipad + */ + guchar k_opad[64]; /* outer padding - + * key XORd with opad + */ + guchar digest[S_GNET_MD5_HASH_LENGTH]; + gint i; + + /* start out by storing key in pads */ + memset(k_ipad, 0, sizeof k_ipad); + memset(k_opad, 0, sizeof k_opad); + + if (key_len > 64) { + /* if key is longer than 64 bytes reset it to key=MD5(key) */ + SMD5 *tmd5; + + tmd5 = s_gnet_md5_new(key, key_len); + memcpy(k_ipad, s_gnet_md5_get_digest(tmd5), + S_GNET_MD5_HASH_LENGTH); + memcpy(k_opad, s_gnet_md5_get_digest(tmd5), + S_GNET_MD5_HASH_LENGTH); + s_gnet_md5_delete(tmd5); + } else { + memcpy(k_ipad, key, key_len); + memcpy(k_opad, key, key_len); + } + + /* + * the HMAC_MD5 transform looks like: + * + * MD5(K XOR opad, MD5(K XOR ipad, text)) + * + * where K is an n byte key + * ipad is the byte 0x36 repeated 64 times + * opad is the byte 0x5c repeated 64 times + * and text is the data being protected + */ + + + /* XOR key with ipad and opad values */ + for (i = 0; i < 64; i++) { + k_ipad[i] ^= 0x36; + k_opad[i] ^= 0x5c; + } + + /* + * perform inner MD5 + */ + md5 = s_gnet_md5_new_incremental(); /* init context for 1st + * pass */ + s_gnet_md5_update(md5, k_ipad, 64); /* start with inner pad */ + s_gnet_md5_update(md5, text, text_len); /* then text of datagram */ + s_gnet_md5_final(md5); /* finish up 1st pass */ + memcpy(digest, s_gnet_md5_get_digest(md5), S_GNET_MD5_HASH_LENGTH); + s_gnet_md5_delete(md5); + + /* + * perform outer MD5 + */ + md5 = s_gnet_md5_new_incremental(); /* init context for 2nd + * pass */ + s_gnet_md5_update(md5, k_opad, 64); /* start with outer pad */ + s_gnet_md5_update(md5, digest, 16); /* then results of 1st + * hash */ + s_gnet_md5_final(md5); /* finish up 2nd pass */ + + return md5; +} + +void +md5_hmac(guchar *digest, + const guchar *text, gint text_len, + const guchar *key, gint key_len) +{ + SMD5 *md5; + + md5 = md5_hmac_get(text, text_len, key, key_len); + memcpy(digest, s_gnet_md5_get_digest(md5), S_GNET_MD5_HASH_LENGTH); + s_gnet_md5_delete(md5); +} + +void +md5_hex_hmac(gchar *hexdigest, + const guchar *text, gint text_len, + const guchar *key, gint key_len) +{ + SMD5 *md5; + + md5 = md5_hmac_get(text, text_len, key, key_len); + s_gnet_md5_copy_string(md5, hexdigest); + hexdigest[S_GNET_MD5_HASH_LENGTH * 2] = '\0'; + s_gnet_md5_delete(md5); +} -- cgit v1.3