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Diffstat (limited to 'libtomcrypt/src/mac/hmac/hmac_memory_multi.c')
-rw-r--r--libtomcrypt/src/mac/hmac/hmac_memory_multi.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/libtomcrypt/src/mac/hmac/hmac_memory_multi.c b/libtomcrypt/src/mac/hmac/hmac_memory_multi.c
new file mode 100644
index 0000000..2382502
--- /dev/null
+++ b/libtomcrypt/src/mac/hmac/hmac_memory_multi.c
@@ -0,0 +1,92 @@
+/* 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 hmac_memory_multi.c
+ HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer
+*/
+
+#ifdef LTC_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: 1.5 $ */
+/* $Date: 2006/11/03 00:39:49 $ */