Changeset 523fb23 for lib/sha1.c

Timestamp:

2010-08-11T08:08:39Z (14 years ago)

Author:

Wilmer van der Gaast <wilmer@…>

Branches:

master

Children:

7f34ce2

Parents:

7db65b7

Message:

Implement MSNP15 SSO (Sadistic Sign-On).

File:

• lib/sha1.c (modified) (2 diffs)

lib/sha1.c

@@ -36 +36 @@
  */
 
+#include <string.h>
 #include "sha1.h"
 
@@ -374 +375 @@
         sha1_process_block(context);
 }
+
+#define HMAC_BLOCK_SIZE 64
+
+/* BitlBee addition: */
+void sha1_hmac(const char *key_, size_t key_len, const char *payload, size_t payload_len, uint8_t Message_Digest[sha1_hash_size])
+{
+        sha1_state_t sha1;
+        uint8_t hash[sha1_hash_size];
+        uint8_t key[HMAC_BLOCK_SIZE+1];
+        int i;
+        
+        if( key_len == 0 )
+                key_len = strlen( key_ );
+        if( payload_len == 0 )
+                payload_len = strlen( payload );
+        
+        /* Create K. If our current key is >64 chars we have to hash it,
+           otherwise just pad. */
+        memset( key, 0, HMAC_BLOCK_SIZE + 1 );
+        if( key_len > HMAC_BLOCK_SIZE )
+        {
+                sha1_init( &sha1 );
+                sha1_append( &sha1, (uint8_t*) key_, key_len );
+                sha1_finish( &sha1, key );
+        }
+        else
+        {
+                memcpy( key, key_, key_len );
+        }
+        
+        /* Inner part: H(K XOR 0x36, text) */
+        sha1_init( &sha1 );
+        for( i = 0; i < HMAC_BLOCK_SIZE; i ++ )
+                key[i] ^= 0x36;
+        sha1_append( &sha1, key, HMAC_BLOCK_SIZE );
+        sha1_append( &sha1, (const uint8_t*) payload, payload_len );
+        sha1_finish( &sha1, hash );
+        
+        /* Final result: H(K XOR 0x5C, inner stuff) */
+        sha1_init( &sha1 );
+        for( i = 0; i < HMAC_BLOCK_SIZE; i ++ )
+                key[i] ^= 0x36 ^ 0x5c;
+        sha1_append( &sha1, key, HMAC_BLOCK_SIZE );
+        sha1_append( &sha1, hash, sha1_hash_size );
+        sha1_finish( &sha1, Message_Digest );
+}