这是indexloc提供的服务，不要输入任何密码
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language correction and speed-up #206

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Apr 25, 2023
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language correction and speed-up #206

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13 changes: 0 additions & 13 deletions rsa/key.py
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Original file line number Diff line number Diff line change
Expand Up @@ -486,19 +486,6 @@ def blinded_decrypt(self, encrypted: int) -> int:

return self.unblind(decrypted, blindfac_inverse)

def blinded_encrypt(self, message: int) -> int:
"""Encrypts the message using blinding to prevent side-channel attacks.

:param message: the message to encrypt
:type message: int

:returns: the encrypted message
:rtype: int
"""

blinded, blindfac_inverse = self.blind(message)
encrypted = rsa.core.encrypt_int(blinded, self.d, self.n)
return self.unblind(encrypted, blindfac_inverse)

@classmethod
def _load_pkcs1_der(cls, keyfile: bytes) -> "PrivateKey":
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10 changes: 5 additions & 5 deletions rsa/pkcs1.py
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Original file line number Diff line number Diff line change
Expand Up @@ -311,7 +311,7 @@ def sign_hash(hash_value: bytes, priv_key: key.PrivateKey, hash_method: str) ->
padded = _pad_for_signing(cleartext, keylength)

payload = transform.bytes2int(padded)
encrypted = priv_key.blinded_encrypt(payload)
encrypted = priv_key.blinded_decrypt(payload)
block = transform.int2bytes(encrypted, keylength)

return block
Expand Down Expand Up @@ -355,8 +355,11 @@ def verify(message: bytes, signature: bytes, pub_key: key.PublicKey) -> str:
"""

keylength = common.byte_size(pub_key.n)
if len(signature) != keylength:
raise VerificationError("Verification failed")

encrypted = transform.bytes2int(signature)
decrypted = core.decrypt_int(encrypted, pub_key.e, pub_key.n)
decrypted = core.encrypt_int(encrypted, pub_key.e, pub_key.n)
clearsig = transform.int2bytes(decrypted, keylength)

# Get the hash method
Expand All @@ -367,9 +370,6 @@ def verify(message: bytes, signature: bytes, pub_key: key.PublicKey) -> str:
cleartext = HASH_ASN1[method_name] + message_hash
expected = _pad_for_signing(cleartext, keylength)

if len(signature) != keylength:
raise VerificationError("Verification failed")

# Compare with the signed one
if expected != clearsig:
raise VerificationError("Verification failed")
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