From 71f17341d8861dd707f2d9efa9902b884f6fc2a9 Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Sat, 16 Mar 2013 21:22:33 +0000
Subject: Add the script that generates the switch in tls_suite_info.cpp

---
 src/build-data/scripts/parse_tls_params.py | 122 +++++++++++++++++++++++++++++
 src/tls/tls_suite_info.cpp                 |   5 +-
 2 files changed, 126 insertions(+), 1 deletion(-)
 create mode 100755 src/build-data/scripts/parse_tls_params.py

(limited to 'src')

diff --git a/src/build-data/scripts/parse_tls_params.py b/src/build-data/scripts/parse_tls_params.py
new file mode 100755
index 000000000..844598b0e
--- /dev/null
+++ b/src/build-data/scripts/parse_tls_params.py
@@ -0,0 +1,122 @@
+#!/usr/bin/python
+
+import sys, re
+
+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]
+
+    cipher_info = {
+        'RC4': ('ARC4',None),
+        'IDEA': ('IDEA',16),
+        'DES': ('DES',8),
+        '3DES': ('3DES',24),
+        'CAMELLIA': ('Camellia',None),
+        'AES': ('AES',None),
+        'SEED': ('SEED',16),
+        }
+
+    tls_to_botan_names = {
+        'anon': '',
+        'MD5': 'MD5',
+        'SHA': 'SHA-1',
+        'SHA256': 'SHA-256',
+        'SHA384': 'SHA-384',
+        'SHA512': 'SHA-512',
+        'RC4': 'ARC4',
+        '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_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)
+
+    return 'Ciphersuite(0x%s, "%s", "%s", "%s", "%s", %d)' % (
+        code, sig_algo, kex_algo, mac_algo, cipher_algo, cipher_keylen)
+
+def main(args = None):
+    if args is None:
+        args = sys.argv
+
+    # http://www.iana.org/assignments/tls-parameters/tls-parameters.txt
+    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)
+
+            not_supported = ['SCSV', 'KRB5', 'EXPORT', 'RC2', '_DES_', 'WITH_NULL',
+                             'ECDH_ECDSA', 'ECDH_RSA', 'DH_DSS', 'DH_RSA',
+                             'RSA_PSK', 'GCM', 'CCM', 'ARIA', 'IDEA']
+
+            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))
+
+    # From http://tools.ietf.org/html/draft-ietf-tls-56-bit-ciphersuites-01
+    suites['DHE_DSS_WITH_RC4_128_SHA'] = ('0066', to_ciphersuite_info('0066', 'DHE_DSS_WITH_RC4_128_SHA'))
+
+    for k in sorted(suites.keys()):
+        print "      case 0x%s: // %s" % (suites[k][0], k)
+        print "         return %s;" % (suites[k][1])
+        print
+
+    #print "return std::vector<u16bit>({"
+    #for k in sorted([k[0] for k in suites.values()]):
+    #    print "0x%s, " % (k),
+    #print "});"
+
+if __name__ == '__main__':
+    sys.exit(main())
diff --git a/src/tls/tls_suite_info.cpp b/src/tls/tls_suite_info.cpp
index b281e89d3..33df10776 100644
--- a/src/tls/tls_suite_info.cpp
+++ b/src/tls/tls_suite_info.cpp
@@ -13,7 +13,10 @@ namespace TLS {
 
 Ciphersuite Ciphersuite::by_id(u16bit suite)
    {
-   // Automatically generated by a Python script from the IANA values
+   /*
+   * This switch was automatically generated from the IANA assignments
+   * by the script src/build-data/scripts/parse_tls_params.py
+   */
 
    switch(suite)
       {
-- 
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