The Android Open Source Project | 845e012 | 2009-03-03 19:31:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * WPA Supplicant / wrapper functions for libcrypto |
| 3 | * Copyright (c) 2004-2005, Jouni Malinen <j@w1.fi> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * Alternatively, this software may be distributed under the terms of BSD |
| 10 | * license. |
| 11 | * |
| 12 | * See README and COPYING for more details. |
| 13 | */ |
| 14 | |
| 15 | #include "includes.h" |
| 16 | #include <openssl/opensslv.h> |
| 17 | #include <openssl/md4.h> |
| 18 | #include <openssl/md5.h> |
| 19 | #include <openssl/sha.h> |
| 20 | #include <openssl/des.h> |
| 21 | #include <openssl/aes.h> |
| 22 | |
| 23 | #include "common.h" |
| 24 | #include "crypto.h" |
| 25 | |
| 26 | #if OPENSSL_VERSION_NUMBER < 0x00907000 |
| 27 | #define DES_key_schedule des_key_schedule |
| 28 | #define DES_cblock des_cblock |
| 29 | #define DES_set_key(key, schedule) des_set_key((key), *(schedule)) |
| 30 | #define DES_ecb_encrypt(input, output, ks, enc) \ |
| 31 | des_ecb_encrypt((input), (output), *(ks), (enc)) |
| 32 | #endif /* openssl < 0.9.7 */ |
| 33 | |
| 34 | |
| 35 | void md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) |
| 36 | { |
| 37 | MD4_CTX ctx; |
| 38 | size_t i; |
| 39 | |
| 40 | MD4_Init(&ctx); |
| 41 | for (i = 0; i < num_elem; i++) |
| 42 | MD4_Update(&ctx, addr[i], len[i]); |
| 43 | MD4_Final(mac, &ctx); |
| 44 | } |
| 45 | |
| 46 | |
| 47 | void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher) |
| 48 | { |
| 49 | u8 pkey[8], next, tmp; |
| 50 | int i; |
| 51 | DES_key_schedule ks; |
| 52 | |
| 53 | /* Add parity bits to the key */ |
| 54 | next = 0; |
| 55 | for (i = 0; i < 7; i++) { |
| 56 | tmp = key[i]; |
| 57 | pkey[i] = (tmp >> i) | next | 1; |
| 58 | next = tmp << (7 - i); |
| 59 | } |
| 60 | pkey[i] = next | 1; |
| 61 | |
| 62 | DES_set_key(&pkey, &ks); |
| 63 | DES_ecb_encrypt((DES_cblock *) clear, (DES_cblock *) cypher, &ks, |
| 64 | DES_ENCRYPT); |
| 65 | } |
| 66 | |
| 67 | |
| 68 | #ifdef EAP_TLS_FUNCS |
| 69 | void md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) |
| 70 | { |
| 71 | MD5_CTX ctx; |
| 72 | size_t i; |
| 73 | |
| 74 | MD5_Init(&ctx); |
| 75 | for (i = 0; i < num_elem; i++) |
| 76 | MD5_Update(&ctx, addr[i], len[i]); |
| 77 | MD5_Final(mac, &ctx); |
| 78 | } |
| 79 | |
| 80 | |
| 81 | void sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) |
| 82 | { |
| 83 | SHA_CTX ctx; |
| 84 | size_t i; |
| 85 | |
| 86 | SHA1_Init(&ctx); |
| 87 | for (i = 0; i < num_elem; i++) |
| 88 | SHA1_Update(&ctx, addr[i], len[i]); |
| 89 | SHA1_Final(mac, &ctx); |
| 90 | } |
| 91 | |
| 92 | |
| 93 | static void sha1_transform(u8 *state, const u8 data[64]) |
| 94 | { |
| 95 | SHA_CTX context; |
| 96 | os_memset(&context, 0, sizeof(context)); |
| 97 | os_memcpy(&context.h0, state, 5 * 4); |
| 98 | SHA1_Transform(&context, data); |
| 99 | os_memcpy(state, &context.h0, 5 * 4); |
| 100 | } |
| 101 | |
| 102 | |
| 103 | int fips186_2_prf(const u8 *seed, size_t seed_len, u8 *x, size_t xlen) |
| 104 | { |
| 105 | u8 xkey[64]; |
| 106 | u32 t[5], _t[5]; |
| 107 | int i, j, m, k; |
| 108 | u8 *xpos = x; |
| 109 | u32 carry; |
| 110 | |
| 111 | if (seed_len > sizeof(xkey)) |
| 112 | seed_len = sizeof(xkey); |
| 113 | |
| 114 | /* FIPS 186-2 + change notice 1 */ |
| 115 | |
| 116 | os_memcpy(xkey, seed, seed_len); |
| 117 | os_memset(xkey + seed_len, 0, 64 - seed_len); |
| 118 | t[0] = 0x67452301; |
| 119 | t[1] = 0xEFCDAB89; |
| 120 | t[2] = 0x98BADCFE; |
| 121 | t[3] = 0x10325476; |
| 122 | t[4] = 0xC3D2E1F0; |
| 123 | |
| 124 | m = xlen / 40; |
| 125 | for (j = 0; j < m; j++) { |
| 126 | /* XSEED_j = 0 */ |
| 127 | for (i = 0; i < 2; i++) { |
| 128 | /* XVAL = (XKEY + XSEED_j) mod 2^b */ |
| 129 | |
| 130 | /* w_i = G(t, XVAL) */ |
| 131 | os_memcpy(_t, t, 20); |
| 132 | sha1_transform((u8 *) _t, xkey); |
| 133 | _t[0] = host_to_be32(_t[0]); |
| 134 | _t[1] = host_to_be32(_t[1]); |
| 135 | _t[2] = host_to_be32(_t[2]); |
| 136 | _t[3] = host_to_be32(_t[3]); |
| 137 | _t[4] = host_to_be32(_t[4]); |
| 138 | os_memcpy(xpos, _t, 20); |
| 139 | |
| 140 | /* XKEY = (1 + XKEY + w_i) mod 2^b */ |
| 141 | carry = 1; |
| 142 | for (k = 19; k >= 0; k--) { |
| 143 | carry += xkey[k] + xpos[k]; |
| 144 | xkey[k] = carry & 0xff; |
| 145 | carry >>= 8; |
| 146 | } |
| 147 | |
| 148 | xpos += 20; |
| 149 | } |
| 150 | /* x_j = w_0|w_1 */ |
| 151 | } |
| 152 | |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | |
| 157 | void * aes_encrypt_init(const u8 *key, size_t len) |
| 158 | { |
| 159 | AES_KEY *ak; |
| 160 | ak = os_malloc(sizeof(*ak)); |
| 161 | if (ak == NULL) |
| 162 | return NULL; |
| 163 | if (AES_set_encrypt_key(key, 8 * len, ak) < 0) { |
| 164 | os_free(ak); |
| 165 | return NULL; |
| 166 | } |
| 167 | return ak; |
| 168 | } |
| 169 | |
| 170 | |
| 171 | void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt) |
| 172 | { |
| 173 | AES_encrypt(plain, crypt, ctx); |
| 174 | } |
| 175 | |
| 176 | |
| 177 | void aes_encrypt_deinit(void *ctx) |
| 178 | { |
| 179 | os_free(ctx); |
| 180 | } |
| 181 | |
| 182 | |
| 183 | void * aes_decrypt_init(const u8 *key, size_t len) |
| 184 | { |
| 185 | AES_KEY *ak; |
| 186 | ak = os_malloc(sizeof(*ak)); |
| 187 | if (ak == NULL) |
| 188 | return NULL; |
| 189 | if (AES_set_decrypt_key(key, 8 * len, ak) < 0) { |
| 190 | os_free(ak); |
| 191 | return NULL; |
| 192 | } |
| 193 | return ak; |
| 194 | } |
| 195 | |
| 196 | |
| 197 | void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain) |
| 198 | { |
| 199 | AES_decrypt(crypt, plain, ctx); |
| 200 | } |
| 201 | |
| 202 | |
| 203 | void aes_decrypt_deinit(void *ctx) |
| 204 | { |
| 205 | os_free(ctx); |
| 206 | } |
| 207 | #endif /* EAP_TLS_FUNCS */ |