crypto_gnutls.c
Go to the documentation of this file.
00001 /*
00002  * WPA Supplicant / wrapper functions for libgcrypt
00003  * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License version 2 as
00007  * published by the Free Software Foundation.
00008  *
00009  * Alternatively, this software may be distributed under the terms of BSD
00010  * license.
00011  *
00012  * See README and COPYING for more details.
00013  */
00014 
00015 #include "includes.h"
00016 #include <gcrypt.h>
00017 
00018 #include "common.h"
00019 #include "crypto.h"
00020 
00021 int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
00022 {
00023         gcry_md_hd_t hd;
00024         unsigned char *p;
00025         size_t i;
00026 
00027         if (gcry_md_open(&hd, GCRY_MD_MD4, 0) != GPG_ERR_NO_ERROR)
00028                 return -1;
00029         for (i = 0; i < num_elem; i++)
00030                 gcry_md_write(hd, addr[i], len[i]);
00031         p = gcry_md_read(hd, GCRY_MD_MD4);
00032         if (p)
00033                 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD4));
00034         gcry_md_close(hd);
00035         return 0;
00036 }
00037 
00038 
00039 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
00040 {
00041         gcry_cipher_hd_t hd;
00042         u8 pkey[8], next, tmp;
00043         int i;
00044 
00045         /* Add parity bits to the key */
00046         next = 0;
00047         for (i = 0; i < 7; i++) {
00048                 tmp = key[i];
00049                 pkey[i] = (tmp >> i) | next | 1;
00050                 next = tmp << (7 - i);
00051         }
00052         pkey[i] = next | 1;
00053 
00054         gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
00055         gcry_err_code(gcry_cipher_setkey(hd, pkey, 8));
00056         gcry_cipher_encrypt(hd, cypher, 8, clear, 8);
00057         gcry_cipher_close(hd);
00058 }
00059 
00060 
00061 int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
00062 {
00063         gcry_md_hd_t hd;
00064         unsigned char *p;
00065         size_t i;
00066 
00067         if (gcry_md_open(&hd, GCRY_MD_MD5, 0) != GPG_ERR_NO_ERROR)
00068                 return -1;
00069         for (i = 0; i < num_elem; i++)
00070                 gcry_md_write(hd, addr[i], len[i]);
00071         p = gcry_md_read(hd, GCRY_MD_MD5);
00072         if (p)
00073                 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD5));
00074         gcry_md_close(hd);
00075         return 0;
00076 }
00077 
00078 
00079 int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
00080 {
00081         gcry_md_hd_t hd;
00082         unsigned char *p;
00083         size_t i;
00084 
00085         if (gcry_md_open(&hd, GCRY_MD_SHA1, 0) != GPG_ERR_NO_ERROR)
00086                 return -1;
00087         for (i = 0; i < num_elem; i++)
00088                 gcry_md_write(hd, addr[i], len[i]);
00089         p = gcry_md_read(hd, GCRY_MD_SHA1);
00090         if (p)
00091                 memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_SHA1));
00092         gcry_md_close(hd);
00093         return 0;
00094 }
00095 
00096 
00097 void * aes_encrypt_init(const u8 *key, size_t len)
00098 {
00099         gcry_cipher_hd_t hd;
00100 
00101         if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
00102             GPG_ERR_NO_ERROR) {
00103                 printf("cipher open failed\n");
00104                 return NULL;
00105         }
00106         if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
00107                 printf("setkey failed\n");
00108                 gcry_cipher_close(hd);
00109                 return NULL;
00110         }
00111 
00112         return hd;
00113 }
00114 
00115 
00116 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
00117 {
00118         gcry_cipher_hd_t hd = ctx;
00119         gcry_cipher_encrypt(hd, crypt, 16, plain, 16);
00120 }
00121 
00122 
00123 void aes_encrypt_deinit(void *ctx)
00124 {
00125         gcry_cipher_hd_t hd = ctx;
00126         gcry_cipher_close(hd);
00127 }
00128 
00129 
00130 void * aes_decrypt_init(const u8 *key, size_t len)
00131 {
00132         gcry_cipher_hd_t hd;
00133 
00134         if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
00135             GPG_ERR_NO_ERROR)
00136                 return NULL;
00137         if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
00138                 gcry_cipher_close(hd);
00139                 return NULL;
00140         }
00141 
00142         return hd;
00143 }
00144 
00145 
00146 void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
00147 {
00148         gcry_cipher_hd_t hd = ctx;
00149         gcry_cipher_decrypt(hd, plain, 16, crypt, 16);
00150 }
00151 
00152 
00153 void aes_decrypt_deinit(void *ctx)
00154 {
00155         gcry_cipher_hd_t hd = ctx;
00156         gcry_cipher_close(hd);
00157 }
00158 
00159 
00160 int crypto_mod_exp(const u8 *base, size_t base_len,
00161                    const u8 *power, size_t power_len,
00162                    const u8 *modulus, size_t modulus_len,
00163                    u8 *result, size_t *result_len)
00164 {
00165         gcry_mpi_t bn_base = NULL, bn_exp = NULL, bn_modulus = NULL,
00166                 bn_result = NULL;
00167         int ret = -1;
00168 
00169         if (gcry_mpi_scan(&bn_base, GCRYMPI_FMT_USG, base, base_len, NULL) !=
00170             GPG_ERR_NO_ERROR ||
00171             gcry_mpi_scan(&bn_exp, GCRYMPI_FMT_USG, power, power_len, NULL) !=
00172             GPG_ERR_NO_ERROR ||
00173             gcry_mpi_scan(&bn_modulus, GCRYMPI_FMT_USG, modulus, modulus_len,
00174                           NULL) != GPG_ERR_NO_ERROR)
00175                 goto error;
00176         bn_result = gcry_mpi_new(modulus_len * 8);
00177 
00178         gcry_mpi_powm(bn_result, bn_base, bn_exp, bn_modulus);
00179 
00180         if (gcry_mpi_print(GCRYMPI_FMT_USG, result, *result_len, result_len,
00181                            bn_result) != GPG_ERR_NO_ERROR)
00182                 goto error;
00183 
00184         ret = 0;
00185 
00186 error:
00187         gcry_mpi_release(bn_base);
00188         gcry_mpi_release(bn_exp);
00189         gcry_mpi_release(bn_modulus);
00190         gcry_mpi_release(bn_result);
00191         return ret;
00192 }
00193 
00194 
00195 struct crypto_cipher {
00196         gcry_cipher_hd_t enc;
00197         gcry_cipher_hd_t dec;
00198 };
00199 
00200 
00201 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
00202                                           const u8 *iv, const u8 *key,
00203                                           size_t key_len)
00204 {
00205         struct crypto_cipher *ctx;
00206         gcry_error_t res;
00207         enum gcry_cipher_algos a;
00208         int ivlen;
00209 
00210         ctx = os_zalloc(sizeof(*ctx));
00211         if (ctx == NULL)
00212                 return NULL;
00213 
00214         switch (alg) {
00215         case CRYPTO_CIPHER_ALG_RC4:
00216                 a = GCRY_CIPHER_ARCFOUR;
00217                 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_STREAM,
00218                                        0);
00219                 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_STREAM, 0);
00220                 break;
00221         case CRYPTO_CIPHER_ALG_AES:
00222                 if (key_len == 24)
00223                         a = GCRY_CIPHER_AES192;
00224                 else if (key_len == 32)
00225                         a = GCRY_CIPHER_AES256;
00226                 else
00227                         a = GCRY_CIPHER_AES;
00228                 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
00229                 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
00230                 break;
00231         case CRYPTO_CIPHER_ALG_3DES:
00232                 a = GCRY_CIPHER_3DES;
00233                 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
00234                 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
00235                 break;
00236         case CRYPTO_CIPHER_ALG_DES:
00237                 a = GCRY_CIPHER_DES;
00238                 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
00239                 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
00240                 break;
00241         case CRYPTO_CIPHER_ALG_RC2:
00242                 if (key_len == 5)
00243                         a = GCRY_CIPHER_RFC2268_40;
00244                 else
00245                         a = GCRY_CIPHER_RFC2268_128;
00246                 res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
00247                 gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
00248                 break;
00249         default:
00250                 os_free(ctx);
00251                 return NULL;
00252         }
00253 
00254         if (res != GPG_ERR_NO_ERROR) {
00255                 os_free(ctx);
00256                 return NULL;
00257         }
00258 
00259         if (gcry_cipher_setkey(ctx->enc, key, key_len) != GPG_ERR_NO_ERROR ||
00260             gcry_cipher_setkey(ctx->dec, key, key_len) != GPG_ERR_NO_ERROR) {
00261                 gcry_cipher_close(ctx->enc);
00262                 gcry_cipher_close(ctx->dec);
00263                 os_free(ctx);
00264                 return NULL;
00265         }
00266 
00267         ivlen = gcry_cipher_get_algo_blklen(a);
00268         if (gcry_cipher_setiv(ctx->enc, iv, ivlen) != GPG_ERR_NO_ERROR ||
00269             gcry_cipher_setiv(ctx->dec, iv, ivlen) != GPG_ERR_NO_ERROR) {
00270                 gcry_cipher_close(ctx->enc);
00271                 gcry_cipher_close(ctx->dec);
00272                 os_free(ctx);
00273                 return NULL;
00274         }
00275 
00276         return ctx;
00277 }
00278 
00279 
00280 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
00281                           u8 *crypt, size_t len)
00282 {
00283         if (gcry_cipher_encrypt(ctx->enc, crypt, len, plain, len) !=
00284             GPG_ERR_NO_ERROR)
00285                 return -1;
00286         return 0;
00287 }
00288 
00289 
00290 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
00291                           u8 *plain, size_t len)
00292 {
00293         if (gcry_cipher_decrypt(ctx->dec, plain, len, crypt, len) !=
00294             GPG_ERR_NO_ERROR)
00295                 return -1;
00296         return 0;
00297 }
00298 
00299 
00300 void crypto_cipher_deinit(struct crypto_cipher *ctx)
00301 {
00302         gcry_cipher_close(ctx->enc);
00303         gcry_cipher_close(ctx->dec);
00304         os_free(ctx);
00305 }


wpa_supplicant
Author(s): Package maintained by Blaise Gassend
autogenerated on Thu Jan 2 2014 11:26:36