2 * WPA Supplicant / wrapper functions for libgcrypt
3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
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.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
21 int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
27 if (gcry_md_open(&hd, GCRY_MD_MD4, 0) != GPG_ERR_NO_ERROR)
29 for (i = 0; i < num_elem; i++)
30 gcry_md_write(hd, addr[i], len[i]);
31 p = gcry_md_read(hd, GCRY_MD_MD4);
33 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD4));
39 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
42 u8 pkey[8], next, tmp;
45 /* Add parity bits to the key */
47 for (i = 0; i < 7; i++) {
49 pkey[i] = (tmp >> i) | next | 1;
50 next = tmp << (7 - i);
54 gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
55 gcry_err_code(gcry_cipher_setkey(hd, pkey, 8));
56 gcry_cipher_encrypt(hd, cypher, 8, clear, 8);
57 gcry_cipher_close(hd);
61 int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
67 if (gcry_md_open(&hd, GCRY_MD_MD5, 0) != GPG_ERR_NO_ERROR)
69 for (i = 0; i < num_elem; i++)
70 gcry_md_write(hd, addr[i], len[i]);
71 p = gcry_md_read(hd, GCRY_MD_MD5);
73 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD5));
79 int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
85 if (gcry_md_open(&hd, GCRY_MD_SHA1, 0) != GPG_ERR_NO_ERROR)
87 for (i = 0; i < num_elem; i++)
88 gcry_md_write(hd, addr[i], len[i]);
89 p = gcry_md_read(hd, GCRY_MD_SHA1);
91 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_SHA1));
97 void * aes_encrypt_init(const u8 *key, size_t len)
101 if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
103 printf("cipher open failed\n");
106 if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
107 printf("setkey failed\n");
108 gcry_cipher_close(hd);
116 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
118 gcry_cipher_hd_t hd = ctx;
119 gcry_cipher_encrypt(hd, crypt, 16, plain, 16);
123 void aes_encrypt_deinit(void *ctx)
125 gcry_cipher_hd_t hd = ctx;
126 gcry_cipher_close(hd);
130 void * aes_decrypt_init(const u8 *key, size_t len)
134 if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
137 if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
138 gcry_cipher_close(hd);
146 void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
148 gcry_cipher_hd_t hd = ctx;
149 gcry_cipher_decrypt(hd, plain, 16, crypt, 16);
153 void aes_decrypt_deinit(void *ctx)
155 gcry_cipher_hd_t hd = ctx;
156 gcry_cipher_close(hd);
160 int crypto_mod_exp(const u8 *base, size_t base_len,
161 const u8 *power, size_t power_len,
162 const u8 *modulus, size_t modulus_len,
163 u8 *result, size_t *result_len)
165 gcry_mpi_t bn_base = NULL, bn_exp = NULL, bn_modulus = NULL,
169 if (gcry_mpi_scan(&bn_base, GCRYMPI_FMT_USG, base, base_len, NULL) !=
171 gcry_mpi_scan(&bn_exp, GCRYMPI_FMT_USG, power, power_len, NULL) !=
173 gcry_mpi_scan(&bn_modulus, GCRYMPI_FMT_USG, modulus, modulus_len,
174 NULL) != GPG_ERR_NO_ERROR)
176 bn_result = gcry_mpi_new(modulus_len * 8);
178 gcry_mpi_powm(bn_result, bn_base, bn_exp, bn_modulus);
180 if (gcry_mpi_print(GCRYMPI_FMT_USG, result, *result_len, result_len,
181 bn_result) != GPG_ERR_NO_ERROR)
187 gcry_mpi_release(bn_base);
188 gcry_mpi_release(bn_exp);
189 gcry_mpi_release(bn_modulus);
190 gcry_mpi_release(bn_result);
195 struct crypto_cipher {
196 gcry_cipher_hd_t enc;
197 gcry_cipher_hd_t dec;
201 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
202 const u8 *iv, const u8 *key,
205 struct crypto_cipher *ctx;
207 enum gcry_cipher_algos a;
210 ctx = os_zalloc(sizeof(*ctx));
215 case CRYPTO_CIPHER_ALG_RC4:
216 a = GCRY_CIPHER_ARCFOUR;
217 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_STREAM,
219 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_STREAM, 0);
221 case CRYPTO_CIPHER_ALG_AES:
223 a = GCRY_CIPHER_AES192;
224 else if (key_len == 32)
225 a = GCRY_CIPHER_AES256;
228 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
229 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
231 case CRYPTO_CIPHER_ALG_3DES:
232 a = GCRY_CIPHER_3DES;
233 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
234 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
236 case CRYPTO_CIPHER_ALG_DES:
238 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
239 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
241 case CRYPTO_CIPHER_ALG_RC2:
243 a = GCRY_CIPHER_RFC2268_40;
245 a = GCRY_CIPHER_RFC2268_128;
246 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
247 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
254 if (res != GPG_ERR_NO_ERROR) {
259 if (gcry_cipher_setkey(ctx->enc, key, key_len) != GPG_ERR_NO_ERROR ||
260 gcry_cipher_setkey(ctx->dec, key, key_len) != GPG_ERR_NO_ERROR) {
261 gcry_cipher_close(ctx->enc);
262 gcry_cipher_close(ctx->dec);
267 ivlen = gcry_cipher_get_algo_blklen(a);
268 if (gcry_cipher_setiv(ctx->enc, iv, ivlen) != GPG_ERR_NO_ERROR ||
269 gcry_cipher_setiv(ctx->dec, iv, ivlen) != GPG_ERR_NO_ERROR) {
270 gcry_cipher_close(ctx->enc);
271 gcry_cipher_close(ctx->dec);
280 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
281 u8 *crypt, size_t len)
283 if (gcry_cipher_encrypt(ctx->enc, crypt, len, plain, len) !=
290 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
291 u8 *plain, size_t len)
293 if (gcry_cipher_decrypt(ctx->dec, plain, len, crypt, len) !=
300 void crypto_cipher_deinit(struct crypto_cipher *ctx)
302 gcry_cipher_close(ctx->enc);
303 gcry_cipher_close(ctx->dec);