Module « Crypto.Signature.PKCS1_PSS »

Fonction EMSA_PSS_ENCODE - module Crypto.Signature.PKCS1_PSS

Signature de la fonction EMSA_PSS_ENCODE

def EMSA_PSS_ENCODE(mhash, emBits, randFunc, mgf, sLen) 

Description

EMSA_PSS_ENCODE.__doc__

    Implement the ``EMSA-PSS-ENCODE`` function, as defined
    in PKCS#1 v2.1 (RFC3447, 9.1.1).

    The original ``EMSA-PSS-ENCODE`` actually accepts the message ``M`` as input,
    and hash it internally. Here, we expect that the message has already
    been hashed instead.

    :Parameters:
     mhash : hash object
            The hash object that holds the digest of the message being signed.
     emBits : int
            Maximum length of the final encoding, in bits.
     randFunc : callable
            An RNG function that accepts as only parameter an int, and returns
            a string of random bytes, to be used as salt.
     mgf : callable
            A mask generation function that accepts two parameters: a string to
            use as seed, and the lenth of the mask to generate, in bytes.
     sLen : int
            Length of the salt, in bytes.

    :Return: An ``emLen`` byte long string that encodes the hash
            (with ``emLen = \ceil(emBits/8)``).

    :Raise ValueError:
        When digest or salt length are too big.