def sign(msg, d, curve=P256, hashfunc=sha256):
"""Sign a message using the elliptic curve digital signature algorithm.
The elliptic curve signature algorithm is described in full in FIPS 186-4 Section 6. Please
refer to http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf for more information.
Args:
| msg (str|bytes|bytearray): A message to be signed.
| d (long): The ECDSA private key of the signer.
| curve (fastecdsa.curve.Curve): The curve to be used to sign the message.
| hashfunc (_hashlib.HASH): The hash function used to compress the message.
"""
# generate a deterministic nonce per RFC6979
rfc6979 = RFC6979(msg, d, curve.q, hashfunc)
k = rfc6979.gen_nonce()
hashed = hashfunc(msg_bytes(msg)).hexdigest()
r, s = _ecdsa.sign(
hashed,
str(d),
str(k),
str(curve.p),
str(curve.a),
str(curve.b),
str(curve.q),
str(curve.gx),
str(curve.gy)
)
return (int(r), int(s))
def sign_digest(digest_hex,
privkey_hex,
curve=fastecdsa.curve.secp256k1,
hashfunc=hashlib.sha256):
"""
Sign a digest with ECDSA
Return base64 signature
"""
pk_i = decode_privkey_hex(str(privkey_hex))
# generate a deterministic nonce per RFC6979
rfc6979 = RFC6979_blockstack(pk_i, curve.q, hashfunc)
k = rfc6979.gen_nonce_from_digest(digest_hex.decode('hex'))
r, s = _ecdsa.sign(digest_hex, str(pk_i), str(k), curve.name)
return encode_signature(int(r), int(s))
def sign(msg: MsgTypes, d: int, curve: Curve = P256, hashfunc=sha256, prehashed: bool = False):
"""Sign a message using the elliptic curve digital signature algorithm.
The elliptic curve signature algorithm is described in full in FIPS 186-4 Section 6. Please
refer to http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf for more information.
Args:
| msg (str|bytes|bytearray): A message to be signed.
| d (int): The ECDSA private key of the signer.
| curve (fastecdsa.curve.Curve): The curve to be used to sign the message.
| hashfunc (_hashlib.HASH): The hash function used to compress the message.
| prehashed (bool): The message being passed has already been hashed by :code:`hashfunc`.
"""
# generate a deterministic nonce per RFC6979
rfc6979 = RFC6979(msg, d, curve.q, hashfunc, prehashed=prehashed)
k = rfc6979.gen_nonce()
# Fix the bit-length of the random nonce,
# so that it doesn't leak via timing.
# This does not change that ks (mod n) = kt (mod n) = k (mod n)
ks = k + curve.q
kt = ks + curve.q
if ks.bit_length() == curve.q.bit_length():
k = kt
else:
k = ks
if prehashed:
hex_digest = hexlify(msg).decode()
else:
hex_digest = hashfunc(msg_bytes(msg)).hexdigest()
r, s = _ecdsa.sign(
hex_digest,
str(d),
str(k),
str(curve.p),
str(curve.a),
str(curve.b),
str(curve.q),
str(curve.gx),
str(curve.gy)
)
return int(r), int(s)
def sign(msg, d, curve=P256, hashfunc=sha256):
"""Sign a message using the elliptic curve digital signature algorithm.
The elliptic curve signature algorithm is described in full in FIPS 186-4 Section 6. Please
refer to http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf for more information.
Args:
| msg (str): A message to be signed.
| d (long): The ECDSA private key of the signer.
| curve (fastecdsa.curve.Curve): The curve to be used to sign the message.
| hashfunc (_hashlib.HASH): The hash function used to compress the message.
"""
# generate a deterministic nonce per RFC6979
#rfc6979 = RFC6979(msg, d, curve.q, hashfunc)
#k = rfc6979.gen_nonce()
#print format(k, '02x')
#hashed = hashfunc(msg.encode()).hexdigest()
k = 0xAF96F7CF8932223963ACEF6CFE675E0661E58B80D62CEF00C
hashed = str(0x0d80b4919e2edb5e1ba3e619e8b60bfad25d16c4deec05a7)
r, s = _ecdsa.sign(hashed, str(d), str(k), curve.name)
return (int(r), int(s))
