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use fastecdsa for signing and verifying transactions (much faster than ecdsa)

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This commit is contained in:
Jude Nelson
2017-02-20 21:03:59 -05:00
parent a9c8c088e2
commit 0466e6d7f5
1 changed files with 7 additions and 14 deletions
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21
blockstack_client/scripts.py
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@@ -269,22 +269,13 @@ def tx_make_input_signature(tx, idx, script, privkey_str, hashcode):
# sign using uncompressed private key
pk_uncompressed_hex, pubk_uncompressed_hex = get_uncompressed_private_and_public_keys(priv)
sk = ecdsa.SigningKey.from_string(pk_uncompressed_hex.decode('hex'), curve=ecdsa.SECP256k1)
sig_bin = sk.sign_digest(txhash, sigencode=ecdsa.util.sigencode_der)
# enforce low-s
sig_r, sig_s = ecdsa.util.sigdecode_der( sig_bin, ecdsa.SECP256k1.order )
if sig_s * 2 >= ecdsa.SECP256k1.order:
log.debug("High-S to low-S")
sig_s = ecdsa.SECP256k1.order - sig_s
sig_bin = ecdsa.util.sigencode_der( sig_r, sig_s, ecdsa.SECP256k1.order )
sigb64 = sign_digest( txhash.encode('hex'), priv )
# sanity check
vk = ecdsa.VerifyingKey.from_string(pubk_uncompressed_hex[2:].decode('hex'), curve=ecdsa.SECP256k1)
assert vk.verify_digest(sig_bin, txhash, sigdecode=ecdsa.util.sigdecode_der), "Failed to verify signature ({}, {})".format(sig_r, sig_s)
assert verify_digest( txhash.encode('hex'), pubk_uncompressed_hex, sigb64 )
sig_r, sig_s = decode_signature(sigb64)
sig_bin = ecdsa.util.sigencode_der( sig_r, sig_s, ecdsa.SECP256k1.order )
sig = sig_bin.encode('hex') + bitcoin.encode(hashcode, 16, 2)
return sig
@@ -499,12 +490,14 @@ def tx_make_subsidizable(blockstack_tx, fee_cb, max_fee, subsidy_key_info, utxo_
@tx_fee should be in satoshis
Returns the transaction; signed if subsidy_key_info is given; unsigned otherwise
Returns None if we can't get subsidy info
Raise ValueError if there are not enough inputs to subsidize
"""
subsidy_info = tx_get_subsidy_info(blockstack_tx, fee_cb, max_fee, subsidy_key_info, utxo_client, tx_fee=tx_fee, subsidy_address=subsidy_address)
if 'error' in subsidy_info:
return subsidy_info
log.error("Failed to get subsidy info: {}".format(subsidy_info['error']))
return None
payer_utxo_inputs = subsidy_info['payer_utxos']
payer_address = subsidy_info['payer_address']