def pubkey_to_pyelliptic(pubkey_hex):
"""
Convert a hex BTC public key into a format suitable for pyelliptic.
@param pubkey_hex: Uncompressed BTC public key in hex format.
@type pubkey_hex: str
@return: A pyelliptic-compatible binary key.
@rtype: str
"""
# Strip the '04' prefix.
pubkey_hex_strip = pubkey_hex[2:]
# Add curve ID and key length.
pubkey_hex_fmt = "".join((
BTC_CURVE_OPENSSL_ID_HEX,
BTC_EC_POINT_LENGTH_HEX,
pubkey_hex_strip[:2 * BTC_EC_POINT_LENGTH],
BTC_EC_POINT_LENGTH_HEX,
pubkey_hex_strip[2 * BTC_EC_POINT_LENGTH:],
))
# Convert to binary and return.
len_key_bin = len(pubkey_hex_fmt) // 2
return arithmetic.changebase(pubkey_hex_fmt, 16, 256, minlen=len_key_bin)
def test_privkey_to_pyelliptic(self):
privkey_bin_fmt = crypto_util.privkey_to_pyelliptic(self.privkey_hex)
header_bin = crypto_util.BTC_CURVE_OPENSSL_ID_HEX.decode('hex')
length_bin = crypto_util.BTC_EC_POINT_LENGTH_HEX.decode('hex')
privkey_bin = arithmetic.changebase(
self.privkey_hex, 16, 256, minlen=crypto_util.BTC_EC_POINT_LENGTH)
self.assertEqual(privkey_bin_fmt[:2], header_bin)
self.assertEqual(privkey_bin_fmt[2:4], length_bin)
self.assertEqual(privkey_bin_fmt[4:], privkey_bin)
def test_privkey_to_pyelliptic(self):
privkey_bin_fmt = crypto_util.privkey_to_pyelliptic(self.privkey_hex)
header_bin = crypto_util.BTC_CURVE_OPENSSL_ID_HEX.decode('hex')
length_bin = crypto_util.BTC_EC_POINT_LENGTH_HEX.decode('hex')
privkey_bin = arithmetic.changebase(
self.privkey_hex, 16, 256, minlen=crypto_util.BTC_EC_POINT_LENGTH
)
self.assertEqual(privkey_bin_fmt[:2], header_bin)
self.assertEqual(privkey_bin_fmt[2:4], length_bin)
self.assertEqual(privkey_bin_fmt[4:], privkey_bin)
def test_pubkey_to_pyelliptic(self):
pubkey_bin_fmt = crypto_util.pubkey_to_pyelliptic(self.pubkey_hex)
point_len = crypto_util.BTC_EC_POINT_LENGTH
header_bin = crypto_util.BTC_CURVE_OPENSSL_ID_HEX.decode('hex')
length_bin = crypto_util.BTC_EC_POINT_LENGTH_HEX.decode('hex')
pubkey_bin = arithmetic.changebase(
self.pubkey_hex_strip, 16, 256, minlen=2*point_len
)
self.assertEqual(pubkey_bin_fmt[:2], header_bin)
self.assertEqual(pubkey_bin_fmt[2:4], length_bin)
self.assertEqual(pubkey_bin_fmt[4:4+point_len], pubkey_bin[:point_len])
self.assertEqual(pubkey_bin_fmt[4+point_len:6+point_len], length_bin)
self.assertEqual(pubkey_bin_fmt[6+point_len:], pubkey_bin[point_len:])
def privkey_to_pyelliptic(privkey_hex):
"""
Convert a hex BTC private key into a format suitable for pyelliptic.
@param privkey_hex: Compressed BTC private key in hex format.
@type privkey_hex: str
@return: A pyelliptic-compatible binary key.
@rtype: str
"""
# Add curve ID and key length.
privkey_hex_fmt = "".join(
(BTC_CURVE_OPENSSL_ID_HEX, BTC_EC_POINT_LENGTH_HEX, privkey_hex))
# Convert to binary and return.
len_key_bin = len(privkey_hex_fmt) // 2
return arithmetic.changebase(privkey_hex_fmt, 16, 256, minlen=len_key_bin)
def test_pubkey_to_pyelliptic(self):
pubkey_bin_fmt = crypto_util.pubkey_to_pyelliptic(self.pubkey_hex)
point_len = crypto_util.BTC_EC_POINT_LENGTH
header_bin = crypto_util.BTC_CURVE_OPENSSL_ID_HEX.decode('hex')
length_bin = crypto_util.BTC_EC_POINT_LENGTH_HEX.decode('hex')
pubkey_bin = arithmetic.changebase(self.pubkey_hex_strip,
16,
256,
minlen=2 * point_len)
self.assertEqual(pubkey_bin_fmt[:2], header_bin)
self.assertEqual(pubkey_bin_fmt[2:4], length_bin)
self.assertEqual(pubkey_bin_fmt[4:4 + point_len],
pubkey_bin[:point_len])
self.assertEqual(pubkey_bin_fmt[4 + point_len:6 + point_len],
length_bin)
self.assertEqual(pubkey_bin_fmt[6 + point_len:],
pubkey_bin[point_len:])
def privkey_to_pyelliptic(privkey_hex):
"""
Convert a hex BTC private key into a format suitable for pyelliptic.
@param privkey_hex: Compressed BTC private key in hex format.
@type privkey_hex: str
@return: A pyelliptic-compatible binary key.
@rtype: str
"""
# Add curve ID and key length.
privkey_hex_fmt = "".join((
BTC_CURVE_OPENSSL_ID_HEX,
BTC_EC_POINT_LENGTH_HEX,
privkey_hex
))
# Convert to binary and return.
len_key_bin = len(privkey_hex_fmt) // 2
return arithmetic.changebase(privkey_hex_fmt, 16, 256, minlen=len_key_bin)
def pubkey_to_pyelliptic(pubkey_hex):
"""
Convert a hex BTC public key into a format suitable for pyelliptic.
@param pubkey_hex: Uncompressed BTC public key in hex format.
@type pubkey_hex: str
@return: A pyelliptic-compatible binary key.
@rtype: str
"""
# Strip the '04' prefix.
pubkey_hex_strip = pubkey_hex[2:]
# Add curve ID and key length.
pubkey_hex_fmt = "".join((
BTC_CURVE_OPENSSL_ID_HEX,
BTC_EC_POINT_LENGTH_HEX, pubkey_hex_strip[:2 * BTC_EC_POINT_LENGTH],
BTC_EC_POINT_LENGTH_HEX, pubkey_hex_strip[2 * BTC_EC_POINT_LENGTH:],
))
# Convert to binary and return.
len_key_bin = len(pubkey_hex_fmt) // 2
return arithmetic.changebase(pubkey_hex_fmt, 16, 256, minlen=len_key_bin)