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fix last commit

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This commit is contained in:
Pavol Rusnak 2016-04-12 19:13:48 +02:00
parent 4eccc55c5c
commit 7b702314a6
No known key found for this signature in database
GPG Key ID: 91F3B339B9A02A3D
3 changed files with 16 additions and 9 deletions
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14
extmod/modTrezorCrypto/modTrezorCrypto-base58.h
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@ -24,8 +24,11 @@ STATIC mp_obj_t mod_TrezorCrypto_Base58_encode(mp_obj_t self, mp_obj_t data) {
mp_buffer_info_t databuf;
mp_get_buffer_raise(data, &databuf, MP_BUFFER_READ);
vstr_t vstr;
vstr_init(&vstr, databuf.len * 8000 / 5857 + 1); // 256 = 2^8 ; 58 > 2^5.857
b58enc(vstr.buf, &vstr.len, databuf.buf, databuf.len);
vstr_init_len(&vstr, databuf.len * 8000 / 5857 + 1); // 256 = 2^8 ; 58 > 2^5.857
bool r = b58enc(vstr.buf, &vstr.len, databuf.buf, databuf.len);
if (!r) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "Invalid input"));
}
vstr.len--; // b58enc returns length including the trailing zero
return mp_obj_new_str_from_vstr(&mp_type_str, &vstr);
}
@ -36,8 +39,11 @@ STATIC mp_obj_t mod_TrezorCrypto_Base58_decode(mp_obj_t self, mp_obj_t string) {
mp_buffer_info_t stringbuf;
mp_get_buffer_raise(string, &stringbuf, MP_BUFFER_READ);
vstr_t vstr;
vstr_init(&vstr, stringbuf.len * 5858 / 8000 + 1); // 256 = 2^8 ; 58 < 2^5.858
b58tobin(vstr.buf, &vstr.len, stringbuf.buf);
vstr_init_len(&vstr, stringbuf.len * 5858 / 8000 + 1); // 256 = 2^8 ; 58 < 2^5.858
bool r = b58tobin(vstr.buf, &vstr.len, stringbuf.buf);
if (!r) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "Invalid input"));
}
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_Base58_decode_obj, mod_TrezorCrypto_Base58_decode);

4
src/tests/test_crypto_base58.py
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@ -64,11 +64,11 @@ class TestCryptoBase58(unittest.TestCase):
def test_decode_check(self):
for a, b in self.vectors:
self.assertEqual(trezor.crypto.base58.decode_check(b), trezor.utils.unhexlify('a'))
self.assertEqual(trezor.crypto.base58.decode_check(b), trezor.utils.unhexlify(a))
def test_encode_check(self):
for a, b in self.vectors:
self.assertEqual(trezor.crypto.base58.encode_check(trezor.utils.unhexlify('a')), b)
self.assertEqual(trezor.crypto.base58.encode_check(trezor.utils.unhexlify(a)), b)
if __name__ == '__main__':
unittest.main()

7
src/trezor/crypto/base58.py
View File

@ -10,12 +10,13 @@ def decode(string):
return _base58.decode(string)
def encode_check(data, hashlen=4):
h = sha256.hash(data)
h = sha256.hash(sha256.hash(data))
return encode(data + h[:hashlen])
def decode_check(string, hashlen=4):
data = decode(string)
d, h = data[:-hashlen], data[-hashlen:]
if sha256.hash(d) != h:
d, h1 = data[:-hashlen], data[-hashlen:]
h2 = sha256.hash(sha256.hash(d))[:4]
if h1 != h2:
raise RuntimeError('Checksum error')
return d