#!/usr/bin/env python3
#
# mmgen = Multi-Mode GENerator, command-line Bitcoin cold storage solution
# Copyright (C)2013-2019 The MMGen Project <mmgen@tuta.io>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
test/hashfunc.py: Test internal implementations of SHA256, SHA512 and Keccak256
"""

import sys,os
from mmgen.util import die

assert len(sys.argv) in (2,3),"Test takes 1 or 2 arguments: test name, plus optional rounds count"
test = sys.argv[1].capitalize()
assert test in ('Sha256','Sha512','Keccak'), "Valid choices for test are 'sha256','sha512' or 'keccak'"
random_rounds = int(sys.argv[2]) if len(sys.argv) == 3 else 500

def msg(s): sys.stderr.write(s)
def green(s): return '\033[32;1m' + s + '\033[0m'

class TestHashFunc(object):

	def test_constants(self):
		msg('Testing generated constants: ')
		h = self.t_cls(b'foo')
		if h.H_init != self.H_ref:
			m = 'Generated constants H[] differ from reference value:\nReference:\n{}\nGenerated:\n{}'
			die(3,m.format([hex(n) for n in self.H_ref],[hex(n) for n in h.H_init]))
		if h.K != self.K_ref:
			m = 'Generated constants K[] differ from reference value:\nReference:\n{}\nGenerated:\n{}'
			die(3,m.format([hex(n) for n in self.K_ref],[hex(n) for n in h.K]))
		msg('OK\n')

	def compare_hashes(self,dlen,data):
		sha2_ref = getattr(self.hashlib,self.desc)(data).hexdigest()
		ret = self.t_cls(data).hexdigest()
		if ret != sha2_ref:
			m ='\nHashes do not match!\nReference {d}: {}\nMMGen {d}:     {}'
			die(3,m.format(sha2_ref,ret,d=self.desc.upper()))

	def test_ref(self,input_n=None):

		inputs = (
			'','x','xa','the','7_chars''8charmsg' '9_charmsg','10_charmsg'
			'8charmsg' * 8,
			'8charmsg' * 7 + '7_chars',
			'8charmsg' * 7 + '9_charmsg',
			'\x00','\x00\x00','\x00'*256,
			'\x0f','\x0f\x0f','\x0f'*256,
			'\x0f\x0d','\x0e\x0e'*256,
			'\x00'*511,'\x00'*512,'\x00'*513,
			'\x0f'*512,'\x0f'*511,'\x0f'*513,
			'\x00\x0f'*512,'\x0e\x0f'*511,'\x0a\x0d'*513,
			'\x00\x0f'*1024,'\x0e\x0f'*1023,'\x0a\x0d'*1025 )

		for i,data in enumerate([inputs[input_n]] if input_n is not None else inputs):
			msg('\rTesting reference input data: {:4}/{} '.format(i+1,len(inputs)))
			self.compare_hashes(len(data),data.encode())

		msg('OK\n')

	def test_random(self,rounds):
		for i in range(rounds):
			if i+1 in (1,rounds) or not (i+1) % 10:
				msg('\rTesting random input data:    {:4}/{} '.format(i+1,rounds))
			dlen = int(os.urandom(4).hex(),16) >> 18
			self.compare_hashes(dlen,os.urandom(dlen))
		msg('OK\n')

class TestKeccak(TestHashFunc):
	desc = 'keccak_256'
	def __init__(self):
		from mmgen.keccak import keccak_256
		import sha3
		self.t_cls = keccak_256
		self.hashlib = sha3

	def test_constants(self): pass

class TestSha2(TestHashFunc):

	def __init__(self):
		from mmgen.sha2 import Sha256,Sha512
		import hashlib
		self.t_cls = { 'sha256':Sha256, 'sha512':Sha512 }[self.desc]
		self.hashlib = hashlib

class TestSha256(TestSha2):
	desc = 'sha256'
	H_ref = (
		0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 )
	K_ref = (
		0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
		0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
		0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
		0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
		0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
		0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
		0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
		0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 )

class TestSha512(TestSha2):
	desc = 'sha512'
	H_ref = (
		0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
		0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179 )
	K_ref = (
		0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc, 0x3956c25bf348b538,
		0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118, 0xd807aa98a3030242, 0x12835b0145706fbe,
		0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2, 0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235,
		0xc19bf174cf692694, 0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65,
		0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5, 0x983e5152ee66dfab,
		0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4, 0xc6e00bf33da88fc2, 0xd5a79147930aa725,
		0x06ca6351e003826f, 0x142929670a0e6e70, 0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed,
		0x53380d139d95b3df, 0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b,
		0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30, 0xd192e819d6ef5218,
		0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8, 0x19a4c116b8d2d0c8, 0x1e376c085141ab53,
		0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8, 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373,
		0x682e6ff3d6b2b8a3, 0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec,
		0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b, 0xca273eceea26619c,
		0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, 0x06f067aa72176fba, 0x0a637dc5a2c898a6,
		0x113f9804bef90dae, 0x1b710b35131c471b, 0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc,
		0x431d67c49c100d4c, 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817 )

t = globals()['Test'+test]()
msg(green('Testing internal implementation of {}\n'.format(t.desc)))
t.test_constants()
t.test_ref()
t.test_random(random_rounds)