X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=hmac-sha1.c;h=56d90acc62a352b3b329dffb1280f58ecaf13abd;hb=8f855d283a31a468ea014774c4723a8b77b81644;hp=1424adacfb9bcd0e471f5502412132664f357a5e;hpb=cb23251fd9f7c2d9e519a84b6975091bceb0fa66;p=avr-crypto-lib.git

diff --git a/hmac-sha1.c b/hmac-sha1.c
index 1424ada..56d90ac 100644
--- a/hmac-sha1.c
+++ b/hmac-sha1.c
@@ -1,6 +1,6 @@
 /* hmac-sha1.c */
 /*
-    This file is part of the Crypto-avr-lib/microcrypt-lib.
+    This file is part of the AVR-Crypto-Lib.
     Copyright (C) 2008  Daniel Otte (daniel.otte@rub.de)
 
     This program is free software: you can redistribute it and/or modify
@@ -32,15 +32,15 @@
 #include <string.h>
 #include "config.h"
 #include "sha1.h"
+#include "hmac-sha1.h"
 
 #define IPAD 0x36
 #define OPAD 0x5C
 
-typedef sha1_ctx_t hmac_sha1_ctx_t;
 
 #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);
-	sha1_nextBlock(s, buffer);
-#if defined SECURE_WIPE_BUFFER
-	memset(buffer, 0, SHA256_BLOCK_BITS/8);
-#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);
-	}
+	sha1_init(&(s->a));
+	sha1_nextBlock(&(s->a), buffer);
 	
 	for (i=0; i<SHA1_BLOCK_BYTES; ++i){
-		buffer[i] ^= OPAD;
+		buffer[i] ^= IPAD^OPAD;
 	}
+	sha1_init(&(s->b));
+	sha1_nextBlock(&(s->b), buffer);
+	
 	
-	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.h, 0, 20);
-#endif	
+#endif
 }
 
-#endif
+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_lastBlock(&(s->a), block, length_b);
+}
 
-/*
-void hmac_sha1_nextBlock()
-void hmac_sha1_lastBlock()
-*/
+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));
+}
+
+#endif
 
 /*
  * keylength in bits!
  * message length in bits!
  */
-void hmac_sha1(void* dest, void* key, uint16_t keylength_b, void* msg, uint64_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];