forked from LBRYCommunity/lbry-sdk
102 lines
3 KiB
Python
102 lines
3 KiB
Python
import ecdsa
|
|
import hashlib
|
|
import binascii
|
|
from lbrynet.schema.address import decode_address
|
|
from lbrynet.schema.encoding import decode_b64_fields
|
|
from lbrynet.schema.schema.certificate import Certificate
|
|
from lbrynet.schema.schema.claim import Claim
|
|
from lbrynet.schema.validator import validate_claim_id
|
|
from lbrynet.schema.schema import V_0_0_1, CLAIM_TYPE, CLAIM_TYPES, CERTIFICATE_TYPE, VERSION
|
|
from lbrynet.schema.schema import NIST256p, NIST384p, SECP256k1, SHA256, SHA384
|
|
|
|
|
|
class NIST_ECDSASigner(object):
|
|
CURVE = None
|
|
CURVE_NAME = None
|
|
HASHFUNC = hashlib.sha256
|
|
HASHFUNC_NAME = SHA256
|
|
|
|
def __init__(self, private_key):
|
|
self._private_key = private_key
|
|
|
|
@property
|
|
def private_key(self):
|
|
return self._private_key
|
|
|
|
@property
|
|
def public_key(self):
|
|
return self.private_key.get_verifying_key()
|
|
|
|
@property
|
|
def certificate(self):
|
|
certificate_claim = {
|
|
VERSION: V_0_0_1,
|
|
CLAIM_TYPE: CERTIFICATE_TYPE,
|
|
CLAIM_TYPES[CERTIFICATE_TYPE]: Certificate.load_from_key_obj(self.public_key,
|
|
self.CURVE_NAME)
|
|
}
|
|
return Claim.load(certificate_claim)
|
|
|
|
@classmethod
|
|
def load_pem(cls, pem_string):
|
|
return cls(ecdsa.SigningKey.from_pem(pem_string, hashfunc=cls.HASHFUNC_NAME))
|
|
|
|
@classmethod
|
|
def generate(cls):
|
|
return cls(ecdsa.SigningKey.generate(curve=cls.CURVE, hashfunc=cls.HASHFUNC_NAME))
|
|
|
|
def sign_stream_claim(self, claim, claim_address, cert_claim_id):
|
|
validate_claim_id(cert_claim_id)
|
|
decoded_addr = decode_address(claim_address)
|
|
|
|
to_sign = bytearray()
|
|
to_sign.extend(decoded_addr)
|
|
to_sign.extend(claim.serialized_no_signature)
|
|
to_sign.extend(binascii.unhexlify(cert_claim_id))
|
|
|
|
digest = self.HASHFUNC(to_sign).digest()
|
|
|
|
if not isinstance(self.private_key, ecdsa.SigningKey):
|
|
raise Exception("Not given a signing key")
|
|
sig_dict = {
|
|
"version": V_0_0_1,
|
|
"signatureType": self.CURVE_NAME,
|
|
"signature": self.private_key.sign_digest_deterministic(digest, hashfunc=self.HASHFUNC),
|
|
"certificateId": binascii.unhexlify(cert_claim_id)
|
|
}
|
|
|
|
msg = {
|
|
"version": V_0_0_1,
|
|
"stream": decode_b64_fields(claim.protobuf_dict)['stream'],
|
|
"publisherSignature": sig_dict
|
|
}
|
|
|
|
return Claim.load(msg)
|
|
|
|
|
|
class NIST256pSigner(NIST_ECDSASigner):
|
|
CURVE = ecdsa.NIST256p
|
|
CURVE_NAME = NIST256p
|
|
|
|
|
|
class NIST384pSigner(NIST_ECDSASigner):
|
|
CURVE = ecdsa.NIST384p
|
|
CURVE_NAME = NIST384p
|
|
HASHFUNC = hashlib.sha384
|
|
HASHFUNC_NAME = SHA384
|
|
|
|
|
|
class SECP256k1Signer(NIST_ECDSASigner):
|
|
CURVE = ecdsa.SECP256k1
|
|
CURVE_NAME = SECP256k1
|
|
|
|
|
|
def get_signer(curve):
|
|
if curve == NIST256p:
|
|
return NIST256pSigner
|
|
elif curve == NIST384p:
|
|
return NIST384pSigner
|
|
elif curve == SECP256k1:
|
|
return SECP256k1Signer
|
|
else:
|
|
raise Exception("Unknown curve: %s" % str(curve))
|