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"""
Key handling utilities for DSA keys, domain parameters and signatures..
"""
from asn1crypto.core import Integer
from asn1crypto.keys import DSAParams
from asn1crypto.algos import DSASignature
from . import biginteger
from ..constants import Attribute
def decode_dsa_domain_parameters(der):
"""
Decode RFC 3279 DER-encoded Dss-Params.
:param bytes der: DER-encoded parameters
:rtype: dict(Attribute,*)
"""
params = DSAParams.load(der)
return {
Attribute.BASE: biginteger(params['g']),
Attribute.PRIME: biginteger(params['p']),
Attribute.SUBPRIME: biginteger(params['q']),
}
def encode_dsa_domain_parameters(obj):
"""
Encode RFC 3279 DER-encoded Dss-Params.
:param DomainParameters obj: domain parameters
:rtype: bytes
"""
asn1 = DSAParams({
'g': int.from_bytes(obj[Attribute.BASE], byteorder='big'),
'p': int.from_bytes(obj[Attribute.PRIME], byteorder='big'),
'q': int.from_bytes(obj[Attribute.SUBPRIME], byteorder='big'),
})
return asn1.dump()
def encode_dsa_public_key(key):
"""
Encode DSA public key into RFC 3279 DER-encoded format.
:param PublicKey key: public key
:rtype: bytes
"""
asn1 = Integer(int.from_bytes(key[Attribute.VALUE], byteorder='big'))
return asn1.dump()
def decode_dsa_public_key(der):
"""
Decode a DSA public key from RFC 3279 DER-encoded format.
Returns a `biginteger` encoded as bytes.
:param bytes der: DER-encoded public key
:rtype: bytes
"""
asn1 = Integer.load(der)
return biginteger(asn1)
def encode_dsa_signature(signature):
"""
Encode a signature (generated by :meth:`pkcs11.SignMixin.sign`) into
DER-encoded ASN.1 (Dss_Sig_Value) format.
:param bytes signature: signature as bytes
:rtype: bytes
"""
asn1 = DSASignature.from_p1363(signature)
return asn1.dump()
def decode_dsa_signature(der):
"""
Decode a DER-encoded ASN.1 (Dss_Sig_Value) signature (as generated by
OpenSSL/X.509) into PKCS #11 format.
:param bytes der: DER-encoded signature
:rtype bytes:
"""
asn1 = DSASignature.load(der)
return asn1.to_p1363()
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