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Code Issues Releases Wiki Activity

introduce ecdsa_address_to_hash160

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This commit is contained in:
Pavol Rusnak 2014-01-30 20:34:05 +01:00
parent 7dc057c903
commit 2e4ec7fe0a
5 changed files with 76 additions and 1 deletions
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23
bignum.c
View File

@ -154,6 +154,29 @@ void bn_mod(bignum256 *x, const bignum256 *prime)
}
}
// a = a + b
void bn_addi(bignum256 *a, uint32_t b)
{
uint64_t t = a->val[0];
t += b;
a->val[0] = t & 0x3FFFFFFFu;
t >>= 30;
a->val[1] += t;
}
// a = a * b
void bn_muli(bignum256 *a, uint32_t b)
{
uint64_t t = 0;
int i;
for (i = 0; i < 8; i++) {
t = (uint64_t)(a->val[i]) * b + t;
a->val[i] = t & 0x3FFFFFFFu;
t >>= 30;
}
a->val[8] += t;
}
// x = k * x
// both inputs and result may be bigger than prime but not bigger than 2 * prime
void bn_multiply(const bignum256 *k, bignum256 *x, const bignum256 *prime)

4
bignum.h
View File

@ -73,6 +73,10 @@ void bn_rshift(bignum256 *a);
void bn_mod(bignum256 *x, const bignum256 *prime);
void bn_addi(bignum256 *a, uint32_t b);
void bn_muli(bignum256 *a, uint32_t b);
void bn_multiply(const bignum256 *k, bignum256 *x, const bignum256 *prime);
void bn_fast_mod(bignum256 *x, const bignum256 *prime);

26
ecdsa.c
View File

@ -342,6 +342,32 @@ void ecdsa_get_address(const uint8_t *pub_key, uint8_t version, char *addr)
}
}
int ecdsa_address_to_hash160(const char *addr, uint8_t *hash)
{
if (!addr) return 0;
const char code[] = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
bignum256 num;
uint8_t buf[32];
bn_zero(&num);
uint32_t k;
int i;
for (i = 0; i < strlen(addr); i++) {
bn_muli(&num, 58);
for (k = 0; k <= strlen(code); k++) {
if (code[k] == 0) { // char not found -> invalid address
return 0;
}
if (addr[i] == code[k]) {
bn_addi(&num, k);
break;
}
}
}
bn_write_be(&num, buf);
memcpy(hash, buf + 8, 20);
return 1;
}
int ecdsa_read_pubkey(const uint8_t *pub_key, curve_point *pub)
{
if (pub_key[0] == 0x04) {

1
ecdsa.h
View File

@ -40,6 +40,7 @@ int ecdsa_sign(const uint8_t *priv_key, const uint8_t *msg, uint32_t msg_len, ui
void ecdsa_get_public_key33(const uint8_t *priv_key, uint8_t *pub_key);
void ecdsa_get_public_key65(const uint8_t *priv_key, uint8_t *pub_key);
void ecdsa_get_address(const uint8_t *pub_key, uint8_t version, char *addr);
int ecdsa_address_to_hash160(const char *addr, uint8_t *hash);
int ecdsa_read_pubkey(const uint8_t *pub_key, curve_point *pub);
int ecdsa_verify(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, uint32_t msg_len);

23
tests.c
View File

@ -491,6 +491,23 @@ START_TEST(test_address)
}
END_TEST
START_TEST(test_address_to_hash)
{
uint8_t hash[20];
ecdsa_address_to_hash160("1JwSSubhmg6iPtRjtyqhUYYH7bZg3Lfy1T", hash); ck_assert_mem_eq(hash, fromhex("c4c5d791fcb4654a1ef5e03fe0ad3d9c598f9827"), 20);
ecdsa_address_to_hash160("myTPjxggahXyAzuMcYp5JTkbybANyLsYBW", hash); ck_assert_mem_eq(hash, fromhex("c4c5d791fcb4654a1ef5e03fe0ad3d9c598f9827"), 20);
ecdsa_address_to_hash160("NEWoeZ6gh4CGvRgFAoAGh4hBqpxizGT6gZ", hash); ck_assert_mem_eq(hash, fromhex("c4c5d791fcb4654a1ef5e03fe0ad3d9c598f9827"), 20);
ecdsa_address_to_hash160("LdAPi7uXrLLmeh7u57pzkZc3KovxEDYRJq", hash); ck_assert_mem_eq(hash, fromhex("c4c5d791fcb4654a1ef5e03fe0ad3d9c598f9827"), 20);
ecdsa_address_to_hash160("1C7zdTfnkzmr13HfA2vNm5SJYRK6nEKyq8", hash); ck_assert_mem_eq(hash, fromhex("79fbfc3f34e7745860d76137da68f362380c606c"), 20);
ecdsa_address_to_hash160("mrdwvWkma2D6n9mGsbtkazedQQuoksnqJV", hash); ck_assert_mem_eq(hash, fromhex("79fbfc3f34e7745860d76137da68f362380c606c"), 20);
ecdsa_address_to_hash160("N7hMq7AmgNsQXaYARrEwybbDGei9mcPNqr", hash); ck_assert_mem_eq(hash, fromhex("79fbfc3f34e7745860d76137da68f362380c606c"), 20);
ecdsa_address_to_hash160("LWLwtfycqf1uFqypLAug36W4kdgNwrZdNs", hash); ck_assert_mem_eq(hash, fromhex("79fbfc3f34e7745860d76137da68f362380c606c"), 20);
}
END_TEST
// define test suite and cases
Suite *test_suite(void)
{
@ -511,10 +528,14 @@ Suite *test_suite(void)
tcase_add_test(tc, test_verify_speed);
suite_add_tcase(s, tc);
tc = tcase_create("addresses");
tc = tcase_create("address");
tcase_add_test(tc, test_address);
suite_add_tcase(s, tc);
tc = tcase_create("address_to_hash");
tcase_add_test(tc, test_address_to_hash);
suite_add_tcase(s, tc);
tc = tcase_create("rijndael");
tcase_add_test(tc, test_rijndael);
suite_add_tcase(s, tc);