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https://github.com/vanhoefm/fragattacks.git
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0a5d68aba5
Some crypto libraries can return in these functions (e.g., if a specific hash function is disabled), so we better provide the caller a chance to check whether the call failed. The return values are not yet used anywhere, but they will be needed for future changes.
306 lines
6.9 KiB
C
306 lines
6.9 KiB
C
/*
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* WPA Supplicant / wrapper functions for libgcrypt
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* Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include <gcrypt.h>
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#include "common.h"
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#include "crypto.h"
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int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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{
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gcry_md_hd_t hd;
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unsigned char *p;
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size_t i;
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if (gcry_md_open(&hd, GCRY_MD_MD4, 0) != GPG_ERR_NO_ERROR)
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return -1;
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for (i = 0; i < num_elem; i++)
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gcry_md_write(hd, addr[i], len[i]);
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p = gcry_md_read(hd, GCRY_MD_MD4);
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if (p)
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memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD4));
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gcry_md_close(hd);
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return 0;
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}
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void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
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{
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gcry_cipher_hd_t hd;
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u8 pkey[8], next, tmp;
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int i;
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/* Add parity bits to the key */
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next = 0;
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for (i = 0; i < 7; i++) {
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tmp = key[i];
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pkey[i] = (tmp >> i) | next | 1;
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next = tmp << (7 - i);
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}
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pkey[i] = next | 1;
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gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
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gcry_err_code(gcry_cipher_setkey(hd, pkey, 8));
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gcry_cipher_encrypt(hd, cypher, 8, clear, 8);
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gcry_cipher_close(hd);
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}
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int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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{
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gcry_md_hd_t hd;
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unsigned char *p;
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size_t i;
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if (gcry_md_open(&hd, GCRY_MD_MD5, 0) != GPG_ERR_NO_ERROR)
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return -1;
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for (i = 0; i < num_elem; i++)
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gcry_md_write(hd, addr[i], len[i]);
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p = gcry_md_read(hd, GCRY_MD_MD5);
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if (p)
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memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD5));
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gcry_md_close(hd);
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return 0;
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}
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int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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{
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gcry_md_hd_t hd;
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unsigned char *p;
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size_t i;
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if (gcry_md_open(&hd, GCRY_MD_SHA1, 0) != GPG_ERR_NO_ERROR)
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return -1;
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for (i = 0; i < num_elem; i++)
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gcry_md_write(hd, addr[i], len[i]);
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p = gcry_md_read(hd, GCRY_MD_SHA1);
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if (p)
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memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_SHA1));
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gcry_md_close(hd);
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return 0;
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}
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void * aes_encrypt_init(const u8 *key, size_t len)
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{
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gcry_cipher_hd_t hd;
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if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
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GPG_ERR_NO_ERROR) {
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printf("cipher open failed\n");
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return NULL;
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}
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if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
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printf("setkey failed\n");
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gcry_cipher_close(hd);
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return NULL;
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}
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return hd;
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}
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void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
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{
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gcry_cipher_hd_t hd = ctx;
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gcry_cipher_encrypt(hd, crypt, 16, plain, 16);
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}
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void aes_encrypt_deinit(void *ctx)
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{
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gcry_cipher_hd_t hd = ctx;
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gcry_cipher_close(hd);
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}
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void * aes_decrypt_init(const u8 *key, size_t len)
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{
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gcry_cipher_hd_t hd;
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if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
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GPG_ERR_NO_ERROR)
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return NULL;
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if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
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gcry_cipher_close(hd);
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return NULL;
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}
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return hd;
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}
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void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
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{
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gcry_cipher_hd_t hd = ctx;
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gcry_cipher_decrypt(hd, plain, 16, crypt, 16);
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}
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void aes_decrypt_deinit(void *ctx)
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{
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gcry_cipher_hd_t hd = ctx;
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gcry_cipher_close(hd);
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}
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int crypto_mod_exp(const u8 *base, size_t base_len,
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const u8 *power, size_t power_len,
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const u8 *modulus, size_t modulus_len,
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u8 *result, size_t *result_len)
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{
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gcry_mpi_t bn_base = NULL, bn_exp = NULL, bn_modulus = NULL,
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bn_result = NULL;
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int ret = -1;
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if (gcry_mpi_scan(&bn_base, GCRYMPI_FMT_USG, base, base_len, NULL) !=
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GPG_ERR_NO_ERROR ||
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gcry_mpi_scan(&bn_exp, GCRYMPI_FMT_USG, power, power_len, NULL) !=
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GPG_ERR_NO_ERROR ||
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gcry_mpi_scan(&bn_modulus, GCRYMPI_FMT_USG, modulus, modulus_len,
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NULL) != GPG_ERR_NO_ERROR)
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goto error;
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bn_result = gcry_mpi_new(modulus_len * 8);
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gcry_mpi_powm(bn_result, bn_base, bn_exp, bn_modulus);
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if (gcry_mpi_print(GCRYMPI_FMT_USG, result, *result_len, result_len,
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bn_result) != GPG_ERR_NO_ERROR)
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goto error;
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ret = 0;
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error:
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gcry_mpi_release(bn_base);
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gcry_mpi_release(bn_exp);
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gcry_mpi_release(bn_modulus);
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gcry_mpi_release(bn_result);
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return ret;
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}
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struct crypto_cipher {
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gcry_cipher_hd_t enc;
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gcry_cipher_hd_t dec;
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};
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struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
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const u8 *iv, const u8 *key,
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size_t key_len)
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{
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struct crypto_cipher *ctx;
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gcry_error_t res;
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enum gcry_cipher_algos a;
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int ivlen;
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ctx = os_zalloc(sizeof(*ctx));
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if (ctx == NULL)
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return NULL;
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switch (alg) {
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case CRYPTO_CIPHER_ALG_RC4:
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a = GCRY_CIPHER_ARCFOUR;
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res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_STREAM,
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0);
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gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_STREAM, 0);
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break;
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case CRYPTO_CIPHER_ALG_AES:
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if (key_len == 24)
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a = GCRY_CIPHER_AES192;
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else if (key_len == 32)
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a = GCRY_CIPHER_AES256;
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else
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a = GCRY_CIPHER_AES;
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res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
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gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
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break;
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case CRYPTO_CIPHER_ALG_3DES:
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a = GCRY_CIPHER_3DES;
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res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
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gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
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break;
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case CRYPTO_CIPHER_ALG_DES:
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a = GCRY_CIPHER_DES;
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res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
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gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
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break;
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case CRYPTO_CIPHER_ALG_RC2:
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if (key_len == 5)
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a = GCRY_CIPHER_RFC2268_40;
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else
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a = GCRY_CIPHER_RFC2268_128;
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res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
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gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
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break;
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default:
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os_free(ctx);
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return NULL;
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}
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if (res != GPG_ERR_NO_ERROR) {
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os_free(ctx);
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return NULL;
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}
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if (gcry_cipher_setkey(ctx->enc, key, key_len) != GPG_ERR_NO_ERROR ||
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gcry_cipher_setkey(ctx->dec, key, key_len) != GPG_ERR_NO_ERROR) {
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gcry_cipher_close(ctx->enc);
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gcry_cipher_close(ctx->dec);
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os_free(ctx);
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return NULL;
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}
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ivlen = gcry_cipher_get_algo_blklen(a);
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if (gcry_cipher_setiv(ctx->enc, iv, ivlen) != GPG_ERR_NO_ERROR ||
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gcry_cipher_setiv(ctx->dec, iv, ivlen) != GPG_ERR_NO_ERROR) {
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gcry_cipher_close(ctx->enc);
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gcry_cipher_close(ctx->dec);
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os_free(ctx);
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return NULL;
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}
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return ctx;
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}
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int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
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u8 *crypt, size_t len)
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{
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if (gcry_cipher_encrypt(ctx->enc, crypt, len, plain, len) !=
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GPG_ERR_NO_ERROR)
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return -1;
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return 0;
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}
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int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
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u8 *plain, size_t len)
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{
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if (gcry_cipher_decrypt(ctx->dec, plain, len, crypt, len) !=
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GPG_ERR_NO_ERROR)
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return -1;
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return 0;
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}
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void crypto_cipher_deinit(struct crypto_cipher *ctx)
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{
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gcry_cipher_close(ctx->enc);
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gcry_cipher_close(ctx->dec);
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os_free(ctx);
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}
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