--- /dev/null
+/* 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.
+ */
+#include "tomcrypt.h"
+
+/**
+ @file hmac_memory.c
+ HMAC support, process a block of memory, Tom St Denis/Dobes Vandermeer
+*/
+
+#ifdef LTC_HMAC
+
+/**
+ HMAC a block 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 in The data to HMAC
+ @param inlen The length of the data to HMAC (octets)
+ @param out [out] Destination of the authentication tag
+ @param outlen [in/out] Max size and resulting size of authentication tag
+ @return CRYPT_OK if successful
+*/
+int hmac_memory(int hash,
+ const unsigned char *key, unsigned long keylen,
+ const unsigned char *in, unsigned long inlen,
+ unsigned char *out, unsigned long *outlen)
+{
+ hmac_state *hmac;
+ int err;
+
+ LTC_ARGCHK(key != NULL);
+ LTC_ARGCHK(in != NULL);
+ LTC_ARGCHK(out != NULL);
+ LTC_ARGCHK(outlen != NULL);
+
+ /* make sure hash descriptor is valid */
+ if ((err = hash_is_valid(hash)) != CRYPT_OK) {
+ return err;
+ }
+
+ /* is there a descriptor? */
+ if (hash_descriptor[hash].hmac_block != NULL) {
+ return hash_descriptor[hash].hmac_block(key, keylen, in, inlen, out, outlen);
+ }
+
+ /* nope, so call the hmac functions */
+ /* 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;
+ }
+
+ if ((err = hmac_process(hmac, in, inlen)) != CRYPT_OK) {
+ goto LBL_ERR;
+ }
+
+ if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
+ goto LBL_ERR;
+ }
+
+ err = CRYPT_OK;
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+ zeromem(hmac, sizeof(hmac_state));
+#endif
+
+ XFREE(hmac);
+ return err;
+}
+
+#endif
+
+
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */