Mercurial > dropbear
view libtomcrypt/src/mac/omac/omac_memory_multi.c @ 652:17962b2a6b8f
- Make sure we don't use channel-specific data after it has been freed
with a ChanType->closehandler()
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Sun, 04 Dec 2011 05:27:29 +0800 (2011-12-03) |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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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.com */ #include "tomcrypt.h" #include <stdarg.h> /** @file omac_memory_multi.c OMAC1 support, process multiple blocks of memory, Tom St Denis */ #ifdef LTC_OMAC /** OMAC multiple blocks of memory @param cipher The index of the desired cipher @param key The secret key @param keylen The length of the secret key (octets) @param out [out] The destination of the authentication tag @param outlen [in/out] The max size and resulting size of the authentication tag (octets) @param in The data to send through OMAC @param inlen The length of the data to send through OMAC (octets) @param ... tuples of (data,len) pairs to OMAC, terminated with a (NULL,x) (x=don't care) @return CRYPT_OK if successful */ int omac_memory_multi(int cipher, const unsigned char *key, unsigned long keylen, unsigned char *out, unsigned long *outlen, const unsigned char *in, unsigned long inlen, ...) { int err; omac_state *omac; 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 omac state */ omac = XMALLOC(sizeof(omac_state)); if (omac == NULL) { return CRYPT_MEM; } /* omac process the message */ if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } va_start(args, inlen); curptr = in; curlen = inlen; for (;;) { /* process buf */ if ((err = omac_process(omac, 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 = omac_done(omac, out, outlen)) != CRYPT_OK) { goto LBL_ERR; } LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(omac, sizeof(omac_state)); #endif XFREE(omac); va_end(args); return err; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_memory_multi.c,v $ */ /* $Revision: 1.5 $ */ /* $Date: 2006/11/03 00:39:49 $ */