X-Git-Url: https://git.cryptolib.org/?p=avr-crypto-lib.git;a=blobdiff_plain;f=hmac-sha1.c;h=56d90acc62a352b3b329dffb1280f58ecaf13abd;hp=9271e50c034b31d3deea4a9011131207d0f4eaaa;hb=53f8a8d7ca5c03120224128e1f8552c99f6af11e;hpb=83d0614d8b17eac97f891f7de2bb3ef265751dea

diff --git a/hmac-sha1.c b/hmac-sha1.c
index 9271e50..56d90ac 100644
--- a/hmac-sha1.c
+++ b/hmac-sha1.c
@@ -40,7 +40,7 @@
 
 #ifndef HMAC_SHORTONLY
 
-void hmac_sha1_init(hmac_sha1_ctx_t *s, void* key, uint16_t keylength_b){
+void hmac_sha1_init(hmac_sha1_ctx_t *s, const void* key, uint16_t keylength_b){
 	uint8_t buffer[SHA1_BLOCK_BYTES];
 	uint8_t i;
 	
@@ -54,53 +54,46 @@ void hmac_sha1_init(hmac_sha1_ctx_t *s, void* key, uint16_t keylength_b){
 	for (i=0; i<SHA1_BLOCK_BYTES; ++i){
 		buffer[i] ^= IPAD;
 	}
+	sha1_init(&(s->a));
+	sha1_nextBlock(&(s->a), buffer);
+	
+	for (i=0; i<SHA1_BLOCK_BYTES; ++i){
+		buffer[i] ^= IPAD^OPAD;
+	}
+	sha1_init(&(s->b));
+	sha1_nextBlock(&(s->b), buffer);
+	
 	
-	sha1_init(s);
-	sha1_nextBlock(s, buffer);
 #if defined SECURE_WIPE_BUFFER
 	memset(buffer, 0, SHA1_BLOCK_BYTES);
 #endif
 }
 
-void hmac_sha1_final(hmac_sha1_ctx_t *s, void* key, uint16_t keylength_b){
-	uint8_t buffer[SHA1_BLOCK_BYTES];
-	uint8_t i;
-	sha1_ctx_t a;
-	
-	memset(buffer, 0, SHA1_BLOCK_BYTES);
-	if (keylength_b > SHA1_BLOCK_BITS){
-		sha1((void*)buffer, key, keylength_b);
-	} else {
-		memcpy(buffer, key, (keylength_b+7)/8);
-	}
-	
-	for (i=0; i<SHA1_BLOCK_BYTES; ++i){
-		buffer[i] ^= OPAD;
+void hmac_sha1_nextBlock(hmac_sha1_ctx_t *s, const void* block){
+	sha1_nextBlock(&(s->a), block);
+}
+void hmac_sha1_lastBlock(hmac_sha1_ctx_t *s, const void* block, uint16_t length_b){
+	while(length_b>=SHA1_BLOCK_BITS){
+		sha1_nextBlock(&(s->a), block);
+		block = (uint8_t*)block + SHA1_BLOCK_BYTES;
+		length_b -= SHA1_BLOCK_BITS;
 	}
-	
-	sha1_init(&a);
-	sha1_nextBlock(&a, buffer); /* hash key ^ opad */
-	sha1_ctx2hash((void*)buffer, s);  /* copy hash(key ^ ipad, msg) to buffer */
-	sha1_lastBlock(&a, buffer, SHA1_HASH_BITS);
-	memcpy(s, &a, sizeof(sha1_ctx_t));
-#if defined SECURE_WIPE_BUFFER
-	memset(buffer, 0, SHA1_BLOCK_BYTES);
-	memset(&a, 0, sizeof(sha1_ctx_t));
-#endif	
+	sha1_lastBlock(&(s->a), block, length_b);
 }
 
-#endif
+void hmac_sha1_final(void* dest, hmac_sha1_ctx_t *s){
+	sha1_ctx2hash((sha1_hash_t*)dest, &(s->a));
+	sha1_lastBlock(&(s->b), dest, SHA1_HASH_BITS);
+	sha1_ctx2hash((sha1_hash_t*)dest, &(s->b));
+}
 
-/*
-void hmac_sha1_nextBlock()
-void hmac_sha1_lastBlock()
-*/
+#endif
 
 /*
  * keylength in bits!
  * message length in bits!
  */
-void hmac_sha1(void* dest, void* key, uint16_t keylength_b, void* msg, uint32_t msglength_b){ /* a one-shot*/
+void hmac_sha1(void* dest, const void* key, uint16_t keylength_b, const void* msg, uint32_t msglength_b){ /* a one-shot*/
 	sha1_ctx_t s;
 	uint8_t i;
 	uint8_t buffer[SHA1_BLOCK_BYTES];