Mercurial > dropbear
view libtomcrypt/src/mac/hmac/hmac_memory_multi.c @ 285:1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 08 Mar 2006 13:23:58 +0000 (2006-03-08) |
parents | |
children | 0cbe8f6dbf9e |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org */ #include "tomcrypt.h" #include <stdarg.h> /** @file hmac_memory_multi.c HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer */ #ifdef HMAC /** HMAC multiple blocks of memory to produce the authentication tag @param hash The index of the hash to use @param key The secret key @param keylen The length of the secret key (octets) @param out [out] Destination of the authentication tag @param outlen [in/out] Max size and resulting size of authentication tag @param in The data to HMAC @param inlen The length of the data to HMAC (octets) @param ... tuples of (data,len) pairs to HMAC, terminated with a (NULL,x) (x=don't care) @return CRYPT_OK if successful */ int hmac_memory_multi(int hash, const unsigned char *key, unsigned long keylen, unsigned char *out, unsigned long *outlen, const unsigned char *in, unsigned long inlen, ...) { hmac_state *hmac; int err; va_list args; const unsigned char *curptr; unsigned long curlen; LTC_ARGCHK(key != NULL); LTC_ARGCHK(in != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); /* allocate ram for hmac state */ hmac = XMALLOC(sizeof(hmac_state)); if (hmac == NULL) { return CRYPT_MEM; } if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } va_start(args, inlen); curptr = in; curlen = inlen; for (;;) { /* process buf */ if ((err = hmac_process(hmac, curptr, curlen)) != CRYPT_OK) { goto LBL_ERR; } /* step to next */ curptr = va_arg(args, const unsigned char*); if (curptr == NULL) { break; } curlen = va_arg(args, unsigned long); } if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) { goto LBL_ERR; } LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(hmac, sizeof(hmac_state)); #endif XFREE(hmac); va_end(args); return err; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_memory_multi.c,v $ */ /* $Revision: 1.3 $ */ /* $Date: 2005/05/05 14:35:58 $ */