char*
tr_ssha1( const void * plaintext )
{
enum { saltval_len = 8,
salter_len = 64 };
static const char * salter = "0123456789"
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"./";
size_t i;
unsigned char salt[saltval_len];
uint8_t sha[SHA_DIGEST_LENGTH];
char buf[2*SHA_DIGEST_LENGTH + saltval_len + 2];
tr_cryptoRandBuf( salt, saltval_len );
for( i=0; i<saltval_len; ++i )
salt[i] = salter[ salt[i] % salter_len ];
tr_sha1( sha, plaintext, strlen( plaintext ), salt, saltval_len, NULL );
tr_sha1_to_hex( &buf[1], sha );
memcpy( &buf[1+2*SHA_DIGEST_LENGTH], &salt, saltval_len );
buf[1+2*SHA_DIGEST_LENGTH + saltval_len] = '\0';
buf[0] = '{'; /* signal that this is a hash. this makes saving/restoring
easier */
return tr_strdup( &buf );
}
tr_bool
tr_ssha1_matches( const char * source, const char * pass )
{
char * salt;
size_t saltlen;
char * hashed;
uint8_t buf[SHA_DIGEST_LENGTH];
tr_bool result;
/* extract the salt */
saltlen = strlen( source ) - 2*SHA_DIGEST_LENGTH-1;
salt = tr_malloc( saltlen );
memcpy( salt, source + 2*SHA_DIGEST_LENGTH+1, saltlen );
/* hash pass + salt */
hashed = tr_malloc( 2*SHA_DIGEST_LENGTH + saltlen + 2 );
tr_sha1( buf, pass, strlen( pass ), salt, saltlen, NULL );
tr_sha1_to_hex( &hashed[1], buf );
memcpy( hashed + 1+2*SHA_DIGEST_LENGTH, salt, saltlen );
hashed[1+2*SHA_DIGEST_LENGTH + saltlen] = '\0';
hashed[0] = '{';
result = strcmp( source, hashed ) == 0 ? TRUE : FALSE;
tr_free( hashed );
tr_free( salt );
return result;
}
static int
test_hex (void)
{
char hex1[41];
char hex2[41];
uint8_t sha1[20];
memcpy (hex1, "fb5ef5507427b17e04b69cef31fa3379b456735a", 41);
tr_hex_to_sha1 (sha1, hex1);
tr_sha1_to_hex (hex2, sha1);
check_streq (hex1, hex2);
return 0;
}
