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trezor.crypto.curve: implement verify_recover function for ecdsa

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pull/25/head
Pavol Rusnak 8 years ago
parent c8eb2bf17b
commit b0fa0466dc
No known key found for this signature in database
GPG Key ID: 91F3B339B9A02A3D
4 changed files with 108 additions and 14 deletions
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51
extmod/modtrezorcrypto/modtrezorcrypto-nist256p1.h
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@ -62,14 +62,15 @@ STATIC mp_obj_t mod_TrezorCrypto_Nist256p1_publickey(size_t n_args, const mp_obj
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_Nist256p1_publickey_obj, 2, 3, mod_TrezorCrypto_Nist256p1_publickey);
/// def trezor.crypto.curve.nist256p1.sign(secret_key: bytes, digest: bytes) -> bytes:
/// def trezor.crypto.curve.nist256p1.sign(secret_key: bytes, digest: bytes, compressed: bool=True) -> bytes:
/// '''
/// Uses secret key to produce the signature of the digest.
/// '''
STATIC mp_obj_t mod_TrezorCrypto_Nist256p1_sign(mp_obj_t self, mp_obj_t secret_key, mp_obj_t digest) {
STATIC mp_obj_t mod_TrezorCrypto_Nist256p1_sign(size_t n_args, const mp_obj_t *args) {
mp_buffer_info_t sk, dig;
mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
mp_get_buffer_raise(digest, &dig, MP_BUFFER_READ);
mp_get_buffer_raise(args[1], &sk, MP_BUFFER_READ);
mp_get_buffer_raise(args[2], &dig, MP_BUFFER_READ);
bool compressed = n_args > 3 && args[3] == mp_const_true;
if (sk.len != 32) {
mp_raise_ValueError("Invalid length of secret key");
}
@ -79,13 +80,13 @@ STATIC mp_obj_t mod_TrezorCrypto_Nist256p1_sign(mp_obj_t self, mp_obj_t secret_k
vstr_t vstr;
vstr_init_len(&vstr, 65);
uint8_t pby;
if (0 != ecdsa_sign_digest(&nist256p1, (const uint8_t *)sk.buf, (const uint8_t *)dig.buf, (uint8_t *)vstr.buf + 1, &pby, NULL)) { // TODO: is_canonical
if (0 != ecdsa_sign_digest(&nist256p1, (const uint8_t *)sk.buf, (const uint8_t *)dig.buf, (uint8_t *)vstr.buf + 1, &pby, NULL)) {
mp_raise_ValueError("Signing failed");
}
vstr.buf[0] = 27 + pby + 4;
vstr.buf[0] = 27 + pby + compressed * 4;
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_TrezorCrypto_Nist256p1_sign_obj, mod_TrezorCrypto_Nist256p1_sign);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_Nist256p1_sign_obj, 3, 4, mod_TrezorCrypto_Nist256p1_sign);
/// def trezor.crypto.curve.nist256p1.verify(public_key: bytes, signature: bytes, digest: bytes) -> bool:
/// '''
@ -111,6 +112,41 @@ STATIC mp_obj_t mod_TrezorCrypto_Nist256p1_verify(size_t n_args, const mp_obj_t
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_Nist256p1_verify_obj, 4, 4, mod_TrezorCrypto_Nist256p1_verify);
/// def trezor.crypto.curve.nist256p1.verify_recover(signature: bytes, digest: bytes) -> bytes:
/// '''
/// Uses signature of the digest to verify the digest and recover the public key.
/// Returns public key on success, None on failure.
/// '''
STATIC mp_obj_t mod_TrezorCrypto_Nist256p1_verify_recover(mp_obj_t self, mp_obj_t signature, mp_obj_t digest) {
mp_buffer_info_t sig, dig;
mp_get_buffer_raise(signature, &sig, MP_BUFFER_READ);
mp_get_buffer_raise(digest, &dig, MP_BUFFER_READ);
if (sig.len != 65) {
mp_raise_ValueError("Invalid length of signature");
}
if (dig.len != 32) {
mp_raise_ValueError("Invalid length of digest");
}
uint8_t recid = ((const uint8_t *)sig.buf)[0] - 27;
if (recid >= 8) {
mp_raise_ValueError("Invalid recid in signature");
}
bool compressed = (recid >= 4);
recid &= 3;
vstr_t vstr;
vstr_init_len(&vstr, 65);
if (0 == ecdsa_verify_digest_recover(&nist256p1, (uint8_t *)vstr.buf, (const uint8_t *)sig.buf + 1, (const uint8_t *)dig.buf, recid)) {
if (compressed) {
vstr.buf[0] = 0x02 | (vstr.buf[64] & 1);
vstr.len = 33;
}
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
} else {
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_TrezorCrypto_Nist256p1_verify_recover_obj, mod_TrezorCrypto_Nist256p1_verify_recover);
/// def trezor.crypto.curve.nist256p1.multiply(secret_key: bytes, public_key: bytes) -> bytes:
/// '''
/// Multiplies point defined by public_key with scalar defined by secret_key
@ -140,6 +176,7 @@ STATIC const mp_rom_map_elem_t mod_TrezorCrypto_Nist256p1_locals_dict_table[] =
{ MP_ROM_QSTR(MP_QSTR_publickey), MP_ROM_PTR(&mod_TrezorCrypto_Nist256p1_publickey_obj) },
{ MP_ROM_QSTR(MP_QSTR_sign), MP_ROM_PTR(&mod_TrezorCrypto_Nist256p1_sign_obj) },
{ MP_ROM_QSTR(MP_QSTR_verify), MP_ROM_PTR(&mod_TrezorCrypto_Nist256p1_verify_obj) },
{ MP_ROM_QSTR(MP_QSTR_verify_recover), MP_ROM_PTR(&mod_TrezorCrypto_Nist256p1_verify_recover_obj) },
{ MP_ROM_QSTR(MP_QSTR_multiply), MP_ROM_PTR(&mod_TrezorCrypto_Nist256p1_multiply_obj) },
};
STATIC MP_DEFINE_CONST_DICT(mod_TrezorCrypto_Nist256p1_locals_dict, mod_TrezorCrypto_Nist256p1_locals_dict_table);

51
extmod/modtrezorcrypto/modtrezorcrypto-secp256k1.h
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@ -62,14 +62,15 @@ STATIC mp_obj_t mod_TrezorCrypto_Secp256k1_publickey(size_t n_args, const mp_obj
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_Secp256k1_publickey_obj, 2, 3, mod_TrezorCrypto_Secp256k1_publickey);
/// def trezor.crypto.curve.secp256k1.sign(secret_key: bytes, digest: bytes) -> bytes:
/// def trezor.crypto.curve.secp256k1.sign(secret_key: bytes, digest: bytes, compressed: bool=True) -> bytes:
/// '''
/// Uses secret key to produce the signature of the digest.
/// '''
STATIC mp_obj_t mod_TrezorCrypto_Secp256k1_sign(mp_obj_t self, mp_obj_t secret_key, mp_obj_t digest) {
STATIC mp_obj_t mod_TrezorCrypto_Secp256k1_sign(size_t n_args, const mp_obj_t *args) {
mp_buffer_info_t sk, dig;
mp_get_buffer_raise(secret_key, &sk, MP_BUFFER_READ);
mp_get_buffer_raise(digest, &dig, MP_BUFFER_READ);
mp_get_buffer_raise(args[1], &sk, MP_BUFFER_READ);
mp_get_buffer_raise(args[2], &dig, MP_BUFFER_READ);
bool compressed = n_args > 3 && args[3] == mp_const_true;
if (sk.len != 32) {
mp_raise_ValueError("Invalid length of secret key");
}
@ -79,13 +80,13 @@ STATIC mp_obj_t mod_TrezorCrypto_Secp256k1_sign(mp_obj_t self, mp_obj_t secret_k
vstr_t vstr;
vstr_init_len(&vstr, 65);
uint8_t pby;
if (0 != ecdsa_sign_digest(&secp256k1, (const uint8_t *)sk.buf, (const uint8_t *)dig.buf, (uint8_t *)vstr.buf + 1, &pby, NULL)) { // TODO: is_canonical
if (0 != ecdsa_sign_digest(&secp256k1, (const uint8_t *)sk.buf, (const uint8_t *)dig.buf, (uint8_t *)vstr.buf + 1, &pby, NULL)) {
mp_raise_ValueError("Signing failed");
}
vstr.buf[0] = 27 + pby + 4;
vstr.buf[0] = 27 + pby + compressed * 4;
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_TrezorCrypto_Secp256k1_sign_obj, mod_TrezorCrypto_Secp256k1_sign);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_Secp256k1_sign_obj, 3, 4, mod_TrezorCrypto_Secp256k1_sign);
/// def trezor.crypto.curve.secp256k1.verify(public_key: bytes, signature: bytes, digest: bytes) -> bool:
/// '''
@ -111,6 +112,41 @@ STATIC mp_obj_t mod_TrezorCrypto_Secp256k1_verify(size_t n_args, const mp_obj_t
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_Secp256k1_verify_obj, 4, 4, mod_TrezorCrypto_Secp256k1_verify);
/// def trezor.crypto.curve.secp256k1.verify_recover(signature: bytes, digest: bytes) -> bytes:
/// '''
/// Uses signature of the digest to verify the digest and recover the public key.
/// Returns public key on success, None on failure.
/// '''
STATIC mp_obj_t mod_TrezorCrypto_Secp256k1_verify_recover(mp_obj_t self, mp_obj_t signature, mp_obj_t digest) {
mp_buffer_info_t sig, dig;
mp_get_buffer_raise(signature, &sig, MP_BUFFER_READ);
mp_get_buffer_raise(digest, &dig, MP_BUFFER_READ);
if (sig.len != 65) {
mp_raise_ValueError("Invalid length of signature");
}
if (dig.len != 32) {
mp_raise_ValueError("Invalid length of digest");
}
uint8_t recid = ((const uint8_t *)sig.buf)[0] - 27;
if (recid >= 8) {
mp_raise_ValueError("Invalid recid in signature");
}
bool compressed = (recid >= 4);
recid &= 3;
vstr_t vstr;
vstr_init_len(&vstr, 65);
if (0 == ecdsa_verify_digest_recover(&secp256k1, (uint8_t *)vstr.buf, (const uint8_t *)sig.buf + 1, (const uint8_t *)dig.buf, recid)) {
if (compressed) {
vstr.buf[0] = 0x02 | (vstr.buf[64] & 1);
vstr.len = 33;
}
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
} else {
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_TrezorCrypto_Secp256k1_verify_recover_obj, mod_TrezorCrypto_Secp256k1_verify_recover);
/// def trezor.crypto.curve.secp256k1.multiply(secret_key: bytes, public_key: bytes) -> bytes:
/// '''
/// Multiplies point defined by public_key with scalar defined by secret_key
@ -140,6 +176,7 @@ STATIC const mp_rom_map_elem_t mod_TrezorCrypto_Secp256k1_locals_dict_table[] =
{ MP_ROM_QSTR(MP_QSTR_publickey), MP_ROM_PTR(&mod_TrezorCrypto_Secp256k1_publickey_obj) },
{ MP_ROM_QSTR(MP_QSTR_sign), MP_ROM_PTR(&mod_TrezorCrypto_Secp256k1_sign_obj) },
{ MP_ROM_QSTR(MP_QSTR_verify), MP_ROM_PTR(&mod_TrezorCrypto_Secp256k1_verify_obj) },
{ MP_ROM_QSTR(MP_QSTR_verify_recover), MP_ROM_PTR(&mod_TrezorCrypto_Secp256k1_verify_recover_obj) },
{ MP_ROM_QSTR(MP_QSTR_multiply), MP_ROM_PTR(&mod_TrezorCrypto_Secp256k1_multiply_obj) },
};
STATIC MP_DEFINE_CONST_DICT(mod_TrezorCrypto_Secp256k1_locals_dict, mod_TrezorCrypto_Secp256k1_locals_dict_table);

10
tests/test_trezor.crypto.curve.nist256p1.py
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@ -111,5 +111,15 @@ class TestCryptoNist256p1(unittest.TestCase):
self.assertTrue(nist256p1.verify(pk, sig, dig))
self.assertTrue(nist256p1.verify(pk, sig[1:], dig))
def test_verify_recover(self):
for compressed in [False, True]:
for _ in range(100):
sk = nist256p1.generate_secret()
pk = nist256p1.publickey(sk, compressed)
dig = random.bytes(32)
sig = nist256p1.sign(sk, dig, compressed)
pk2 = nist256p1.verify_recover(sig, dig)
self.assertEqual(pk, pk2)
if __name__ == '__main__':
unittest.main()

10
tests/test_trezor.crypto.curve.secp256k1.py
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@ -100,5 +100,15 @@ class TestCryptoSecp256k1(unittest.TestCase):
sig = secp256k1.sign(sk, dig)
self.assertTrue(secp256k1.verify(pk, sig, dig))
def test_verify_recover(self):
for compressed in [False, True]:
for _ in range(100):
sk = secp256k1.generate_secret()
pk = secp256k1.publickey(sk, compressed)
dig = random.bytes(32)
sig = secp256k1.sign(sk, dig, compressed)
pk2 = secp256k1.verify_recover(sig, dig)
self.assertEqual(pk, pk2)
if __name__ == '__main__':
unittest.main()

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