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#!/usr/bin/env python2
"""
Used to generate src/tls/tls_suite_info.cpp
(C) 2011, 2012, 2013 Jack Lloyd
Distributed under the terms of the Botan license
First thing,
wget https://www.iana.org/assignments/tls-parameters/tls-parameters.txt
"""
import sys
import re
import datetime
def to_ciphersuite_info(code, name):
(sig_and_kex,cipher_and_mac) = name.split('_WITH_')
if sig_and_kex == 'RSA':
sig_algo = 'RSA'
kex_algo = 'RSA'
elif 'PSK' in sig_and_kex:
sig_algo = ''
kex_algo = sig_and_kex
elif 'SRP' in sig_and_kex:
srp_info = sig_and_kex.split('_')
if len(srp_info) == 2: # 'SRP_' + hash
kex_algo = sig_and_kex
sig_algo = ''
else:
kex_algo = '_'.join(srp_info[0:-1])
sig_algo = srp_info[-1]
else:
(kex_algo, sig_algo) = sig_and_kex.split('_')
cipher_and_mac = cipher_and_mac.split('_')
mac_algo = cipher_and_mac[-1]
cipher = cipher_and_mac[:-1]
if mac_algo in ['CCM']:
cipher += [mac_algo]
mac_algo = 'SHA256'
cipher_info = {
'RC4': ('RC4',None),
'IDEA': ('IDEA',16),
'DES': ('DES',8),
'3DES': ('3DES',24),
'CAMELLIA': ('Camellia',None),
'AES': ('AES',None),
'SEED': ('SEED',16),
'ARIA': ('ARIA',16)
}
tls_to_botan_names = {
'anon': '',
'MD5': 'MD5',
'SHA': 'SHA-1',
'SHA256': 'SHA-256',
'SHA384': 'SHA-384',
'SHA512': 'SHA-512',
'RC4': 'RC4',
'3DES': 'TripleDES',
'DSS': 'DSA',
'ECDSA': 'ECDSA',
'RSA': 'RSA',
'SRP_SHA': 'SRP_SHA',
'DHE': 'DH',
'DH': 'DH',
'ECDHE': 'ECDH',
'ECDH': 'ECDH',
'': '',
'PSK': 'PSK',
'DHE_PSK': 'DHE_PSK',
'ECDHE_PSK': 'ECDHE_PSK',
}
mac_keylen = {
'MD5': 16,
'SHA-1': 20,
'SHA-256': 32,
'SHA-384': 48,
'SHA-512': 64,
}
mac_algo = tls_to_botan_names[mac_algo]
sig_algo = tls_to_botan_names[sig_algo]
kex_algo = tls_to_botan_names[kex_algo]
(cipher_algo, cipher_keylen) = cipher_info[cipher[0]]
if cipher_keylen is None:
cipher_keylen = int(cipher[1]) / 8
if cipher_algo in ['AES', 'Camellia']:
cipher_algo += '-%d' % (cipher_keylen*8)
modestr = ''
mode = ''
ivlen = 0
if cipher_algo != 'RC4':
mode = cipher[-1]
if mode not in ['CBC', 'GCM', 'CCM', 'OCB']:
print "#warning Unknown mode %s" % (' '.join(cipher))
ivlen = 8 if cipher_algo == '3DES' else 16
if mode != 'CBC':
cipher_algo += '/' + mode
if cipher_algo != 'RC4' and mode != 'CBC':
return 'Ciphersuite(0x%s, "%s", "%s", "%s", %d, %d, "AEAD", %d, "%s")' % (
code, sig_algo, kex_algo, cipher_algo, cipher_keylen, 4, 0, mac_algo)
else:
return 'Ciphersuite(0x%s, "%s", "%s", "%s", %d, %d, "%s", %d)' % (
code, sig_algo, kex_algo, cipher_algo, cipher_keylen, ivlen, mac_algo, mac_keylen[mac_algo])
def main(args = None):
if args is None:
args = sys.argv
weak_crypto = ['EXPORT', 'RC2', '_DES_', 'WITH_NULL']
weird_crypto = ['ARIA', 'IDEA']
static_dh = ['ECDH_ECDSA', 'ECDH_RSA', 'DH_DSS', 'DH_RSA']
protocol_goop = ['SCSV', 'KRB5']
just_not_yet = ['RSA_PSK', 'CCM_8']
not_supported = weak_crypto + weird_crypto + static_dh + protocol_goop + just_not_yet
input = open('tls-parameters.txt')
ciphersuite_re = re.compile(' +0x([0-9a-fA-F][0-9a-fA-F]),0x([0-9a-fA-F][0-9a-fA-F]) + TLS_([A-Za-z_0-9]+) ')
suites = {}
suite_codes = {}
for line in input:
match = ciphersuite_re.match(line)
if match:
code = match.group(1) + match.group(2)
name = match.group(3)
should_use = True
for ns in not_supported:
if ns in name:
should_use = False
if should_use:
suites[name] = (code, to_ciphersuite_info(code, name))
def define_custom_ciphersuite(name, code):
suites[name] = (code, to_ciphersuite_info(code, name))
# From http://tools.ietf.org/html/draft-ietf-tls-56-bit-ciphersuites-01
define_custom_ciphersuite('DHE_DSS_WITH_RC4_128_SHA', '0066')
# Experimental OCB ciphersuites
#define_custom_ciphersuite('RSA_WITH_AES_128_OCB_SHA256', 'FF80')
#define_custom_ciphersuite('RSA_WITH_AES_256_OCB_SHA384', 'FF81')
#define_custom_ciphersuite('ECDHE_RSA_WITH_AES_128_OCB_SHA256', 'FF82')
#define_custom_ciphersuite('ECDHE_RSA_WITH_AES_256_OCB_SHA384', 'FF83')
# Experimental EAX ciphersuites
#define_custom_ciphersuite('RSA_WITH_AES_128_EAX_SHA256', 'FF90')
#define_custom_ciphersuite('RSA_WITH_AES_256_EAX_SHA384', 'FF91')
#define_custom_ciphersuite('ECDHE_RSA_WITH_AES_128_EAX_SHA256', 'FF92')
#define_custom_ciphersuite('ECDHE_RSA_WITH_AES_256_EAX_SHA384', 'FF93')
print """/*
* TLS cipher suite information
*
* This file was automatically generated from the IANA assignments
* by %s on %s
*
* Released under the terms of the Botan license
*/
#include <botan/tls_ciphersuite.h>
namespace Botan {
namespace TLS {
Ciphersuite Ciphersuite::by_id(u16bit suite)
{
switch(suite)
{""" % (sys.argv[0], datetime.date.today().strftime("%Y-%m-%d"))
for k in sorted(suites.keys()):
print " case 0x%s: // %s" % (suites[k][0], k)
print " return %s;" % (suites[k][1])
print
print """ }
return Ciphersuite(); // some unknown ciphersuite
}
}
}"""
if __name__ == '__main__':
sys.exit(main())
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