PKCS1_PSS.py 文件源码

def MGF1(mgfSeed, maskLen, hash):
    """Mask Generation Function, described in B.2.1"""
    T = b("")
    for counter in xrange(ceil_div(maskLen, hash.digest_size)):
        c = long_to_bytes(counter, 4)
        T = T + hash.new(mgfSeed + c).digest()
    assert(len(T)>=maskLen)
    return T[:maskLen]