Mercurial > dropbear
diff src/mac/xcbc/xcbc_memory_multi.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16
Update to LibTomCrypt 1.16
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 11 Jan 2007 02:22:00 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/mac/xcbc/xcbc_memory_multi.c Thu Jan 11 02:22:00 2007 +0000 @@ -0,0 +1,90 @@ +/* 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, [email protected], http://libtomcrypt.com + */ +#include "tomcrypt.h" +#include <stdarg.h> + +/** + @file xcbc_memory_multi.c + XCBC support, process multiple blocks of memory, Tom St Denis +*/ + +#ifdef LTC_XCBC + +/** + XCBC 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 XCBC + @param inlen The length of the data to send through XCBC (octets) + @param ... tuples of (data,len) pairs to XCBC, terminated with a (NULL,x) (x=don't care) + @return CRYPT_OK if successful +*/ +int xcbc_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; + xcbc_state *xcbc; + 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 xcbc state */ + xcbc = XMALLOC(sizeof(xcbc_state)); + if (xcbc == NULL) { + return CRYPT_MEM; + } + + /* xcbc process the message */ + if ((err = xcbc_init(xcbc, cipher, key, keylen)) != CRYPT_OK) { + goto LBL_ERR; + } + va_start(args, inlen); + curptr = in; + curlen = inlen; + for (;;) { + /* process buf */ + if ((err = xcbc_process(xcbc, 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 = xcbc_done(xcbc, out, outlen)) != CRYPT_OK) { + goto LBL_ERR; + } +LBL_ERR: +#ifdef LTC_CLEAN_STACK + zeromem(xcbc, sizeof(xcbc_state)); +#endif + XFREE(xcbc); + va_end(args); + return err; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_memory_multi.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2006/11/03 01:53:25 $ */