diff options
Diffstat (limited to 'lib/crypto/hmacmd5.c')
| -rw-r--r-- | lib/crypto/hmacmd5.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/lib/crypto/hmacmd5.c b/lib/crypto/hmacmd5.c new file mode 100644 index 0000000000..0c8d1ab598 --- /dev/null +++ b/lib/crypto/hmacmd5.c @@ -0,0 +1,117 @@ +/* + Unix SMB/CIFS implementation. + HMAC MD5 code for use in NTLMv2 + Copyright (C) Luke Kenneth Casson Leighton 1996-2000 + Copyright (C) Andrew Tridgell 1992-2000 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +/* taken direct from rfc2104 implementation and modified for suitable use + * for ntlmv2. + */ + +#include "includes.h" +#include "../lib/crypto/hmacmd5.h" + +/*********************************************************************** + the rfc 2104 version of hmac_md5 initialisation. +***********************************************************************/ +_PUBLIC_ void hmac_md5_init_rfc2104(const uint8_t *key, int key_len, HMACMD5Context *ctx) +{ + int i; + uint8_t tk[16]; + + /* if key is longer than 64 bytes reset it to key=MD5(key) */ + if (key_len > 64) + { + struct MD5Context tctx; + + MD5Init(&tctx); + MD5Update(&tctx, key, key_len); + MD5Final(tk, &tctx); + + key = tk; + key_len = 16; + } + + /* start out by storing key in pads */ + ZERO_STRUCT(ctx->k_ipad); + ZERO_STRUCT(ctx->k_opad); + memcpy( ctx->k_ipad, key, key_len); + memcpy( ctx->k_opad, key, key_len); + + /* XOR key with ipad and opad values */ + for (i=0; i<64; i++) + { + ctx->k_ipad[i] ^= 0x36; + ctx->k_opad[i] ^= 0x5c; + } + + MD5Init(&ctx->ctx); + MD5Update(&ctx->ctx, ctx->k_ipad, 64); +} + +/*********************************************************************** + the microsoft version of hmac_md5 initialisation. +***********************************************************************/ +_PUBLIC_ void hmac_md5_init_limK_to_64(const uint8_t *key, int key_len, + HMACMD5Context *ctx) +{ + /* if key is longer than 64 bytes truncate it */ + if (key_len > 64) + { + key_len = 64; + } + + hmac_md5_init_rfc2104(key, key_len, ctx); +} + +/*********************************************************************** + update hmac_md5 "inner" buffer +***********************************************************************/ +_PUBLIC_ void hmac_md5_update(const uint8_t *text, int text_len, HMACMD5Context *ctx) +{ + MD5Update(&ctx->ctx, text, text_len); /* then text of datagram */ +} + +/*********************************************************************** + finish off hmac_md5 "inner" buffer and generate outer one. +***********************************************************************/ +_PUBLIC_ void hmac_md5_final(uint8_t *digest, HMACMD5Context *ctx) +{ + struct MD5Context ctx_o; + + MD5Final(digest, &ctx->ctx); + + MD5Init(&ctx_o); + MD5Update(&ctx_o, ctx->k_opad, 64); + MD5Update(&ctx_o, digest, 16); + MD5Final(digest, &ctx_o); +} + +/*********************************************************** + single function to calculate an HMAC MD5 digest from data. + use the microsoft hmacmd5 init method because the key is 16 bytes. +************************************************************/ +_PUBLIC_ void hmac_md5(const uint8_t key[16], const uint8_t *data, int data_len, uint8_t *digest) +{ + HMACMD5Context ctx; + hmac_md5_init_limK_to_64(key, 16, &ctx); + if (data_len != 0) + { + hmac_md5_update(data, data_len, &ctx); + } + hmac_md5_final(digest, &ctx); +} |