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fc13489c91
This changes (again...) our system md5 detection to cope with how OpenIndiana does md5. I'm becoming increasingly convinced this isn't worth our while (we should have just done samba_md5...), but for now this change seems to work on FreeBSD, OpenIndiana and Linux with libbsd. This needs us to rename struct MD5Context -> MD5_CTX, but we provide a config.h define to rename the type bad if MD5_CTX does not exist (it does however exist in the md5.h from libbsd). Andrew Bartlett Signed-off-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org> Autobuild-User(master): Jeremy Allison <jra@samba.org> Autobuild-Date(master): Wed Jun 19 21:32:36 CEST 2013 on sn-devel-104
118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/*
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Unix SMB/CIFS implementation.
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HMAC MD5 code for use in NTLMv2
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Copyright (C) Luke Kenneth Casson Leighton 1996-2000
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Copyright (C) Andrew Tridgell 1992-2000
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* taken direct from rfc2104 implementation and modified for suitable use
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* for ntlmv2.
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*/
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#include "replace.h"
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#include "../lib/crypto/hmacmd5.h"
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/***********************************************************************
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the rfc 2104 version of hmac_md5 initialisation.
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***********************************************************************/
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_PUBLIC_ void hmac_md5_init_rfc2104(const uint8_t *key, int key_len, HMACMD5Context *ctx)
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{
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int i;
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uint8_t tk[16];
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/* if key is longer than 64 bytes reset it to key=MD5(key) */
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if (key_len > 64)
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{
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MD5_CTX tctx;
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MD5Init(&tctx);
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MD5Update(&tctx, key, key_len);
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MD5Final(tk, &tctx);
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key = tk;
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key_len = 16;
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}
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/* start out by storing key in pads */
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ZERO_STRUCT(ctx->k_ipad);
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ZERO_STRUCT(ctx->k_opad);
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memcpy( ctx->k_ipad, key, key_len);
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memcpy( ctx->k_opad, key, key_len);
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/* XOR key with ipad and opad values */
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for (i=0; i<64; i++)
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{
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ctx->k_ipad[i] ^= 0x36;
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ctx->k_opad[i] ^= 0x5c;
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}
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MD5Init(&ctx->ctx);
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MD5Update(&ctx->ctx, ctx->k_ipad, 64);
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}
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/***********************************************************************
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the microsoft version of hmac_md5 initialisation.
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***********************************************************************/
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_PUBLIC_ void hmac_md5_init_limK_to_64(const uint8_t *key, int key_len,
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HMACMD5Context *ctx)
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{
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/* if key is longer than 64 bytes truncate it */
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if (key_len > 64)
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{
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key_len = 64;
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}
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hmac_md5_init_rfc2104(key, key_len, ctx);
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}
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/***********************************************************************
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update hmac_md5 "inner" buffer
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***********************************************************************/
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_PUBLIC_ void hmac_md5_update(const uint8_t *text, int text_len, HMACMD5Context *ctx)
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{
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MD5Update(&ctx->ctx, text, text_len); /* then text of datagram */
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}
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/***********************************************************************
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finish off hmac_md5 "inner" buffer and generate outer one.
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***********************************************************************/
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_PUBLIC_ void hmac_md5_final(uint8_t *digest, HMACMD5Context *ctx)
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{
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MD5_CTX ctx_o;
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MD5Final(digest, &ctx->ctx);
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MD5Init(&ctx_o);
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MD5Update(&ctx_o, ctx->k_opad, 64);
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MD5Update(&ctx_o, digest, 16);
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MD5Final(digest, &ctx_o);
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}
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/***********************************************************
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single function to calculate an HMAC MD5 digest from data.
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use the microsoft hmacmd5 init method because the key is 16 bytes.
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************************************************************/
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_PUBLIC_ void hmac_md5(const uint8_t key[16], const uint8_t *data, int data_len, uint8_t *digest)
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{
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HMACMD5Context ctx;
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hmac_md5_init_limK_to_64(key, 16, &ctx);
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if (data_len != 0)
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{
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hmac_md5_update(data, data_len, &ctx);
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}
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hmac_md5_final(digest, &ctx);
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}
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