def get_DSA_pub_key_material(subjectPublicKeyAsn1, parametersAsn1):
'''
Extracts DSA parameters p, q, g from
ASN1 bitstring component subjectPublicKey and parametersAsn1 from
'parameters' field of AlgorithmIdentifier.
'''
pubkey = subjectPublicKeyAsn1.toOctets()
key = decode(pubkey, asn1Spec=DsaPubKey())[0]
parameters = decode(str(parametersAsn1), asn1Spec=DssParams())[0]
paramDict = {"pub": int(key)}
for param in ['p', 'q', 'g']:
paramDict[param] = parameters.getComponentByName(param)._value
return paramDict
def get_DSA_pub_key_material(subjectPublicKeyAsn1, parametersAsn1):
'''
Extracts DSA parameters p, q, g from
ASN1 bitstring component subjectPublicKey and parametersAsn1 from
'parameters' field of AlgorithmIdentifier.
'''
pubkey = subjectPublicKeyAsn1.toOctets()
key = decode(pubkey, asn1Spec=DsaPubKey())[0]
parameters = decode(str(parametersAsn1), asn1Spec=DssParams())[0]
paramDict = {"pub": int(key)}
for param in ['p', 'q', 'g']:
paramDict[param] = parameters.getComponentByName(param)._value
return paramDict
def get_RSA_pub_key_material(subjectPublicKeyAsn1):
'''
Extracts modulus and public exponent from
ASN1 bitstring component subjectPublicKey
'''
# create template for decoder
rsa_key = RsaPubKey()
# convert ASN1 subjectPublicKey component from BITSTRING to octets
pubkey = subjectPublicKeyAsn1.toOctets()
key = decode(pubkey, asn1Spec=rsa_key)[0]
mod = key.getComponentByName("modulus")._value
exp = key.getComponentByName("exp")._value
return {'mod': mod, 'exp': exp}
def get_RSA_pub_key_material(subjectPublicKeyAsn1):
'''
Extracts modulus and public exponent from
ASN1 bitstring component subjectPublicKey
'''
# create template for decoder
rsa_key = RsaPubKey()
# convert ASN1 subjectPublicKey component from BITSTRING to octets
pubkey = subjectPublicKeyAsn1.toOctets()
key = decode(pubkey, asn1Spec=rsa_key)[0]
mod = key.getComponentByName("modulus")._value
exp = key.getComponentByName("exp")._value
return {'mod': mod, 'exp': exp}
