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#!/usr/bin/python
# Copyright 2015 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Module for testing rsa functions using extended commands."""
import hashlib
import struct
import subcmd
import utils
_RSA_OPCODES = {
'ENCRYPT': 0x00,
'DECRYPT': 0x01,
'SIGN': 0x02,
'VERIFY': 0x03,
'KEYGEN': 0x04
}
# TPM2 ALG codes.
_RSA_PADDING = {
'PKCS1-SSA': 0x14,
'PKCS1-ES': 0x15,
'OAEP': 0x17
}
# TPM2 ALG codes.
_HASH = {
'NONE': 0x00,
'SHA1': 0x04,
'SHA256': 0x0B
}
# Command format.
#
# 0x00 OP
# 0x00 PADDING
# 0x00 HASHING
# 0x00 MSB KEY LEN
# 0x00 LSB KEY LEN
# 0x00 MSB IN LEN
# 0x00 LSB IN LEN
# .... IN
# 0x00 MSB DIGEST LEN
# 0x00 LSB DIGEST LEN
# .... DIGEST
#
_RSA_CMD_FORMAT = '{o:c}{p:c}{h:c}{kl:s}{ml:s}{msg}{dl:s}{dig}'
def _decrypt_cmd(padding, hashing, key_len, msg):
op = _RSA_OPCODES['DECRYPT']
msg_len = len(msg)
return _RSA_CMD_FORMAT.format(o=op, p=padding, h=hashing,
kl=struct.pack('>H', key_len),
ml=struct.pack('>H', msg_len), msg=msg,
dl='', dig='')
def _encrypt_cmd(padding, hashing, key_len, msg):
op = _RSA_OPCODES['ENCRYPT']
msg_len = len(msg)
return _RSA_CMD_FORMAT.format(o=op, p=padding, h=hashing,
kl=struct.pack('>H', key_len),
ml=struct.pack('>H', msg_len), msg=msg,
dl='', dig='')
def _sign_cmd(padding, hashing, key_len, msg):
op = _RSA_OPCODES['SIGN']
digest = ''
if hashing == _HASH['SHA1']:
digest = hashlib.sha1(msg).digest()
elif hashing == _HASH['SHA256']:
digest = hashlib.sha256(msg).digest()
digest_len = len(digest)
return _RSA_CMD_FORMAT.format(o=op, p=padding, h=hashing,
kl=struct.pack('>H', key_len),
ml=struct.pack('>H', digest_len), msg=digest,
dl='', dig='')
def _verify_cmd(padding, hashing, key_len, sig, msg):
op = _RSA_OPCODES['VERIFY']
sig_len = len(sig)
digest = ''
if hashing == _HASH['SHA1']:
digest = hashlib.sha1(msg).digest()
elif hashing == _HASH['SHA256']:
digest = hashlib.sha256(msg).digest()
digest_len = len(digest)
return _RSA_CMD_FORMAT.format(o=op, p=padding, h=hashing,
kl=struct.pack('>H', key_len),
ml=struct.pack('>H', sig_len), msg=sig,
dl=struct.pack('>H', digest_len), dig=digest)
#
# TEST VECTORS.
#
_ENCRYPT_INPUTS = (
('OAEP', 'SHA1', 768),
('OAEP', 'SHA256', 768),
('PKCS1-ES', 'NONE', 768),
('PKCS1-ES', 'NONE', 2048),
)
_SIGN_INPUTS = (
# TODO(ngm): add support for PSS.
('PKCS1-SSA', 'SHA1', 768),
('PKCS1-SSA', 'SHA256', 768),
)
class RSAError(Exception):
pass
def _encrypt_tests(tpm):
msg = 'Hello CR50!'
for data in _ENCRYPT_INPUTS:
padding, hashing, key_len = data
test_name = 'RSA-ENC:%s:%s:%d' % data
cmd = _encrypt_cmd(_RSA_PADDING[padding], _HASH[hashing], key_len, msg)
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.RSA, cmd))
ciphertext = tpm.unwrap_ext_response(subcmd.RSA, wrapped_response)
cmd = _decrypt_cmd(_RSA_PADDING[padding], _HASH[hashing],
key_len, ciphertext)
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.RSA, cmd))
plaintext = tpm.unwrap_ext_response(subcmd.RSA, wrapped_response)
if msg != plaintext:
raise RSAError('%s error:%s%s' % (
test_name, utils.hex_dump(msg), utils.hex_dump(plaintext)))
print('%sSUCCESS: %s' % (utils.cursor_back(), test_name))
def _sign_tests(tpm):
msg = 'Hello CR50!'
for data in _SIGN_INPUTS:
padding, hashing, key_len = data
test_name = 'RSA-SIGN:%s:%s:%d' % data
cmd = _sign_cmd(_RSA_PADDING[padding], _HASH[hashing], key_len, msg)
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.RSA, cmd))
signature = tpm.unwrap_ext_response(subcmd.RSA, wrapped_response)
cmd = _verify_cmd(_RSA_PADDING[padding], _HASH[hashing],
key_len, signature, msg)
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.RSA, cmd))
verified = tpm.unwrap_ext_response(subcmd.RSA, wrapped_response)
expected = '\x01'
if verified != expected:
raise RSAError('%s error:%s%s' % (
test_name, utils.hex_dump(verified), utils.hex_dump(expected)))
print('%sSUCCESS: %s' % (utils.cursor_back(), test_name))
def rsa_test(tpm):
_encrypt_tests(tpm)
_sign_tests(tpm)
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