def set_params(p, q, g):
# type: (bytes, bytes, bytes) -> DSA
"""
Factory function that instantiates a DSA object with DSA
parameters.
:param p: value of p, a "byte string"
:param q: value of q, a "byte string"
:param g: value of g, a "byte string"
:return: instance of DSA.
"""
dsa = m2.dsa_new()
m2.dsa_set_pqg(dsa, p, q, g)
return DSA(dsa, 1)
def pub_key_from_params(p, q, g, pub):
# type: (bytes, bytes, bytes, bytes) -> DSA_pub
"""
Factory function that instantiates a DSA_pub object using
the parameters and public key specified.
:param p: value of p
:param q: value of q
:param g: value of g
:param pub: value of the public key
:return: instance of DSA_pub.
"""
dsa = m2.dsa_new()
m2.dsa_set_pqg(dsa, p, q, g)
m2.dsa_set_pub(dsa, pub)
return DSA_pub(dsa, 1)
def set_params(self, p, q, g):
# type: (bytes, bytes, bytes) -> None
"""
Set new parameters.
:param p: MPI binary representation ... format that consists of
the number's length in bytes represented as a 4-byte
big-endian number, and the number itself in big-endian
format, where the most significant bit signals
a negative number (the representation of numbers with
the MSB set is prefixed with null byte).
:param q: ditto
:param g: ditto
@warning: This does not change the private key, so it may be
unsafe to use this method. It is better to use
gen_params function to create a new DSA object.
"""
m2.dsa_set_pqg(self.dsa, p, q, g)