diff options
Diffstat (limited to 'lib/sha1.c')
| -rw-r--r-- | lib/sha1.c | 47 |
1 files changed, 47 insertions, 0 deletions
@@ -35,6 +35,7 @@ * */ +#include <string.h> #include "sha1.h" /* @@ -373,3 +374,49 @@ static void sha1_pad(sha1_state_t * context) 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 ); +} |