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* WPA Supplicant / wrapper functions for libcrypto
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* Copyright (c) 2004-2005, Jouni Malinen <j@w1.fi>
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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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* Alternatively, this software may be distributed under the terms of BSD
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* See README and COPYING for more details.
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#include <openssl/opensslv.h>
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#include <openssl/md4.h>
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#include <openssl/md5.h>
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#include <openssl/sha.h>
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#include <openssl/des.h>
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#include <openssl/aes.h>
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#include <openssl/bn.h>
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#include <openssl/evp.h>
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#if OPENSSL_VERSION_NUMBER < 0x00907000
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#define DES_key_schedule des_key_schedule
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#define DES_cblock des_cblock
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#define DES_set_key(key, schedule) des_set_key((key), *(schedule))
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#define DES_ecb_encrypt(input, output, ks, enc) \
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des_ecb_encrypt((input), (output), *(ks), (enc))
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#endif /* openssl < 0.9.7 */
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void md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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for (i = 0; i < num_elem; i++)
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MD4_Update(&ctx, addr[i], len[i]);
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void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
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u8 pkey[8], next, tmp;
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/* Add parity bits to the key */
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for (i = 0; i < 7; i++) {
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pkey[i] = (tmp >> i) | next | 1;
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next = tmp << (7 - i);
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DES_set_key(&pkey, &ks);
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DES_ecb_encrypt((DES_cblock *) clear, (DES_cblock *) cypher, &ks,
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void md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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for (i = 0; i < num_elem; i++)
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MD5_Update(&ctx, addr[i], len[i]);
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void sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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for (i = 0; i < num_elem; i++)
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SHA1_Update(&ctx, addr[i], len[i]);
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SHA1_Final(mac, &ctx);
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#ifndef CONFIG_NO_FIPS186_2_PRF
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static void sha1_transform(u8 *state, const u8 data[64])
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os_memset(&context, 0, sizeof(context));
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os_memcpy(&context.h0, state, 5 * 4);
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SHA1_Transform(&context, data);
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os_memcpy(state, &context.h0, 5 * 4);
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int fips186_2_prf(const u8 *seed, size_t seed_len, u8 *x, size_t xlen)
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if (seed_len > sizeof(xkey))
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seed_len = sizeof(xkey);
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/* FIPS 186-2 + change notice 1 */
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os_memcpy(xkey, seed, seed_len);
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os_memset(xkey + seed_len, 0, 64 - seed_len);
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for (j = 0; j < m; j++) {
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for (i = 0; i < 2; i++) {
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/* XVAL = (XKEY + XSEED_j) mod 2^b */
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/* w_i = G(t, XVAL) */
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os_memcpy(_t, t, 20);
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sha1_transform((u8 *) _t, xkey);
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_t[0] = host_to_be32(_t[0]);
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_t[1] = host_to_be32(_t[1]);
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_t[2] = host_to_be32(_t[2]);
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_t[3] = host_to_be32(_t[3]);
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_t[4] = host_to_be32(_t[4]);
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os_memcpy(xpos, _t, 20);
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/* XKEY = (1 + XKEY + w_i) mod 2^b */
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for (k = 19; k >= 0; k--) {
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carry += xkey[k] + xpos[k];
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xkey[k] = carry & 0xff;
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#endif /* CONFIG_NO_FIPS186_2_PRF */
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void * aes_encrypt_init(const u8 *key, size_t len)
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ak = os_malloc(sizeof(*ak));
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if (AES_set_encrypt_key(key, 8 * len, ak) < 0) {
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void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
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AES_encrypt(plain, crypt, ctx);
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void aes_encrypt_deinit(void *ctx)
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void * aes_decrypt_init(const u8 *key, size_t len)
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ak = os_malloc(sizeof(*ak));
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if (AES_set_decrypt_key(key, 8 * len, ak) < 0) {
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void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
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AES_decrypt(crypt, plain, ctx);
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void aes_decrypt_deinit(void *ctx)
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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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BIGNUM *bn_base, *bn_exp, *bn_modulus, *bn_result;
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bn_base = BN_bin2bn(base, base_len, NULL);
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bn_exp = BN_bin2bn(power, power_len, NULL);
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bn_modulus = BN_bin2bn(modulus, modulus_len, NULL);
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bn_result = BN_new();
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if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
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if (BN_mod_exp(bn_result, bn_base, bn_exp, bn_modulus, ctx) != 1)
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*result_len = BN_bn2bin(bn_result, result);
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struct crypto_cipher {
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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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struct crypto_cipher *ctx;
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const EVP_CIPHER *cipher;
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ctx = os_zalloc(sizeof(*ctx));
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#ifndef OPENSSL_NO_RC4
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case CRYPTO_CIPHER_ALG_RC4:
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#endif /* OPENSSL_NO_RC4 */
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#ifndef OPENSSL_NO_AES
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case CRYPTO_CIPHER_ALG_AES:
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cipher = EVP_aes_128_cbc();
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cipher = EVP_aes_192_cbc();
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cipher = EVP_aes_256_cbc();
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#endif /* OPENSSL_NO_AES */
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#ifndef OPENSSL_NO_DES
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case CRYPTO_CIPHER_ALG_3DES:
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cipher = EVP_des_ede3_cbc();
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case CRYPTO_CIPHER_ALG_DES:
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cipher = EVP_des_cbc();
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#endif /* OPENSSL_NO_DES */
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#ifndef OPENSSL_NO_RC2
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case CRYPTO_CIPHER_ALG_RC2:
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cipher = EVP_rc2_ecb();
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#endif /* OPENSSL_NO_RC2 */
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EVP_CIPHER_CTX_init(&ctx->enc);
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EVP_CIPHER_CTX_set_padding(&ctx->enc, 0);
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if (!EVP_EncryptInit_ex(&ctx->enc, cipher, NULL, NULL, NULL) ||
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!EVP_CIPHER_CTX_set_key_length(&ctx->enc, key_len) ||
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!EVP_EncryptInit_ex(&ctx->enc, cipher, NULL, key, iv)) {
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EVP_CIPHER_CTX_cleanup(&ctx->enc);
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EVP_CIPHER_CTX_init(&ctx->dec);
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EVP_CIPHER_CTX_set_padding(&ctx->dec, 0);
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if (!EVP_DecryptInit_ex(&ctx->dec, cipher, NULL, NULL, NULL) ||
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!EVP_CIPHER_CTX_set_key_length(&ctx->dec, key_len) ||
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!EVP_DecryptInit_ex(&ctx->dec, cipher, NULL, key, iv)) {
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EVP_CIPHER_CTX_cleanup(&ctx->enc);
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EVP_CIPHER_CTX_cleanup(&ctx->dec);
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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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if (!EVP_EncryptUpdate(&ctx->enc, crypt, &outl, plain, len))
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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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if (!EVP_DecryptUpdate(&ctx->dec, plain, &outl, crypt, len))
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void crypto_cipher_deinit(struct crypto_cipher *ctx)
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EVP_CIPHER_CTX_cleanup(&ctx->enc);
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EVP_CIPHER_CTX_cleanup(&ctx->dec);