2 * WPA Supplicant / wrapper functions for libgcrypt
3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
15 int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
21 if (gcry_md_open(&hd, GCRY_MD_MD4, 0) != GPG_ERR_NO_ERROR)
23 for (i = 0; i < num_elem; i++)
24 gcry_md_write(hd, addr[i], len[i]);
25 p = gcry_md_read(hd, GCRY_MD_MD4);
27 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD4));
33 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
36 u8 pkey[8], next, tmp;
39 /* Add parity bits to the key */
41 for (i = 0; i < 7; i++) {
43 pkey[i] = (tmp >> i) | next | 1;
44 next = tmp << (7 - i);
48 gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
49 gcry_err_code(gcry_cipher_setkey(hd, pkey, 8));
50 gcry_cipher_encrypt(hd, cypher, 8, clear, 8);
51 gcry_cipher_close(hd);
55 int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
61 if (gcry_md_open(&hd, GCRY_MD_MD5, 0) != GPG_ERR_NO_ERROR)
63 for (i = 0; i < num_elem; i++)
64 gcry_md_write(hd, addr[i], len[i]);
65 p = gcry_md_read(hd, GCRY_MD_MD5);
67 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD5));
73 int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
79 if (gcry_md_open(&hd, GCRY_MD_SHA1, 0) != GPG_ERR_NO_ERROR)
81 for (i = 0; i < num_elem; i++)
82 gcry_md_write(hd, addr[i], len[i]);
83 p = gcry_md_read(hd, GCRY_MD_SHA1);
85 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_SHA1));
91 void * aes_encrypt_init(const u8 *key, size_t len)
95 if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
97 printf("cipher open failed\n");
100 if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
101 printf("setkey failed\n");
102 gcry_cipher_close(hd);
110 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
112 gcry_cipher_hd_t hd = ctx;
113 gcry_cipher_encrypt(hd, crypt, 16, plain, 16);
117 void aes_encrypt_deinit(void *ctx)
119 gcry_cipher_hd_t hd = ctx;
120 gcry_cipher_close(hd);
124 void * aes_decrypt_init(const u8 *key, size_t len)
128 if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
131 if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
132 gcry_cipher_close(hd);
140 void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
142 gcry_cipher_hd_t hd = ctx;
143 gcry_cipher_decrypt(hd, plain, 16, crypt, 16);
147 void aes_decrypt_deinit(void *ctx)
149 gcry_cipher_hd_t hd = ctx;
150 gcry_cipher_close(hd);
154 int crypto_mod_exp(const u8 *base, size_t base_len,
155 const u8 *power, size_t power_len,
156 const u8 *modulus, size_t modulus_len,
157 u8 *result, size_t *result_len)
159 gcry_mpi_t bn_base = NULL, bn_exp = NULL, bn_modulus = NULL,
163 if (gcry_mpi_scan(&bn_base, GCRYMPI_FMT_USG, base, base_len, NULL) !=
165 gcry_mpi_scan(&bn_exp, GCRYMPI_FMT_USG, power, power_len, NULL) !=
167 gcry_mpi_scan(&bn_modulus, GCRYMPI_FMT_USG, modulus, modulus_len,
168 NULL) != GPG_ERR_NO_ERROR)
170 bn_result = gcry_mpi_new(modulus_len * 8);
172 gcry_mpi_powm(bn_result, bn_base, bn_exp, bn_modulus);
174 if (gcry_mpi_print(GCRYMPI_FMT_USG, result, *result_len, result_len,
175 bn_result) != GPG_ERR_NO_ERROR)
181 gcry_mpi_release(bn_base);
182 gcry_mpi_release(bn_exp);
183 gcry_mpi_release(bn_modulus);
184 gcry_mpi_release(bn_result);
189 struct crypto_cipher {
190 gcry_cipher_hd_t enc;
191 gcry_cipher_hd_t dec;
195 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
196 const u8 *iv, const u8 *key,
199 struct crypto_cipher *ctx;
201 enum gcry_cipher_algos a;
204 ctx = os_zalloc(sizeof(*ctx));
209 case CRYPTO_CIPHER_ALG_RC4:
210 a = GCRY_CIPHER_ARCFOUR;
211 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_STREAM,
213 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_STREAM, 0);
215 case CRYPTO_CIPHER_ALG_AES:
217 a = GCRY_CIPHER_AES192;
218 else if (key_len == 32)
219 a = GCRY_CIPHER_AES256;
222 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
223 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
225 case CRYPTO_CIPHER_ALG_3DES:
226 a = GCRY_CIPHER_3DES;
227 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
228 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
230 case CRYPTO_CIPHER_ALG_DES:
232 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
233 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
235 case CRYPTO_CIPHER_ALG_RC2:
237 a = GCRY_CIPHER_RFC2268_40;
239 a = GCRY_CIPHER_RFC2268_128;
240 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
241 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
248 if (res != GPG_ERR_NO_ERROR) {
253 if (gcry_cipher_setkey(ctx->enc, key, key_len) != GPG_ERR_NO_ERROR ||
254 gcry_cipher_setkey(ctx->dec, key, key_len) != GPG_ERR_NO_ERROR) {
255 gcry_cipher_close(ctx->enc);
256 gcry_cipher_close(ctx->dec);
261 ivlen = gcry_cipher_get_algo_blklen(a);
262 if (gcry_cipher_setiv(ctx->enc, iv, ivlen) != GPG_ERR_NO_ERROR ||
263 gcry_cipher_setiv(ctx->dec, iv, ivlen) != GPG_ERR_NO_ERROR) {
264 gcry_cipher_close(ctx->enc);
265 gcry_cipher_close(ctx->dec);
274 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
275 u8 *crypt, size_t len)
277 if (gcry_cipher_encrypt(ctx->enc, crypt, len, plain, len) !=
284 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
285 u8 *plain, size_t len)
287 if (gcry_cipher_decrypt(ctx->dec, plain, len, crypt, len) !=
294 void crypto_cipher_deinit(struct crypto_cipher *ctx)
296 gcry_cipher_close(ctx->enc);
297 gcry_cipher_close(ctx->dec);