mirror of
https://github.com/vanhoefm/fragattacks.git
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2d106f21aa
The following defines are not really needed in most places, so remove them to clean up source code and build scripts: EAP_TLS_FUNCS EAP_TLS_OPENSSL EAP_TLS_GNUTLS CONFIG_TLS_INTERNAL
584 lines
12 KiB
C
584 lines
12 KiB
C
/*
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* WPA Supplicant / Crypto wrapper for internal crypto implementation
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* Copyright (c) 2006-2009, 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 "common.h"
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#include "crypto.h"
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#include "md5.h"
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#include "sha1.h"
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#include "aes.h"
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#include "tls/rsa.h"
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#include "tls/bignum.h"
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#include "tls/pkcs1.h"
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#include "tls/pkcs8.h"
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#include "sha1_i.h"
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#include "md5_i.h"
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#include "des_i.h"
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struct crypto_hash {
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enum crypto_hash_alg alg;
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union {
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struct MD5Context md5;
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struct SHA1Context sha1;
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} u;
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u8 key[64];
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size_t key_len;
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};
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struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
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size_t key_len)
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{
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struct crypto_hash *ctx;
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u8 k_pad[64];
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u8 tk[20];
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size_t i;
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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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ctx->alg = alg;
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switch (alg) {
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case CRYPTO_HASH_ALG_MD5:
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MD5Init(&ctx->u.md5);
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break;
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case CRYPTO_HASH_ALG_SHA1:
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SHA1Init(&ctx->u.sha1);
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break;
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case CRYPTO_HASH_ALG_HMAC_MD5:
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if (key_len > sizeof(k_pad)) {
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MD5Init(&ctx->u.md5);
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MD5Update(&ctx->u.md5, key, key_len);
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MD5Final(tk, &ctx->u.md5);
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key = tk;
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key_len = 16;
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}
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os_memcpy(ctx->key, key, key_len);
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ctx->key_len = key_len;
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os_memcpy(k_pad, key, key_len);
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os_memset(k_pad + key_len, 0, sizeof(k_pad) - key_len);
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for (i = 0; i < sizeof(k_pad); i++)
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k_pad[i] ^= 0x36;
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MD5Init(&ctx->u.md5);
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MD5Update(&ctx->u.md5, k_pad, sizeof(k_pad));
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break;
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case CRYPTO_HASH_ALG_HMAC_SHA1:
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if (key_len > sizeof(k_pad)) {
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SHA1Init(&ctx->u.sha1);
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SHA1Update(&ctx->u.sha1, key, key_len);
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SHA1Final(tk, &ctx->u.sha1);
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key = tk;
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key_len = 20;
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}
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os_memcpy(ctx->key, key, key_len);
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ctx->key_len = key_len;
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os_memcpy(k_pad, key, key_len);
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os_memset(k_pad + key_len, 0, sizeof(k_pad) - key_len);
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for (i = 0; i < sizeof(k_pad); i++)
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k_pad[i] ^= 0x36;
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SHA1Init(&ctx->u.sha1);
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SHA1Update(&ctx->u.sha1, k_pad, sizeof(k_pad));
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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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return ctx;
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}
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void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
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{
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if (ctx == NULL)
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return;
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switch (ctx->alg) {
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case CRYPTO_HASH_ALG_MD5:
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case CRYPTO_HASH_ALG_HMAC_MD5:
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MD5Update(&ctx->u.md5, data, len);
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break;
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case CRYPTO_HASH_ALG_SHA1:
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case CRYPTO_HASH_ALG_HMAC_SHA1:
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SHA1Update(&ctx->u.sha1, data, len);
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break;
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}
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}
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int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
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{
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u8 k_pad[64];
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size_t i;
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if (ctx == NULL)
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return -2;
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if (mac == NULL || len == NULL) {
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os_free(ctx);
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return 0;
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}
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switch (ctx->alg) {
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case CRYPTO_HASH_ALG_MD5:
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if (*len < 16) {
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*len = 16;
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os_free(ctx);
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return -1;
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}
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*len = 16;
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MD5Final(mac, &ctx->u.md5);
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break;
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case CRYPTO_HASH_ALG_SHA1:
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if (*len < 20) {
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*len = 20;
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os_free(ctx);
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return -1;
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}
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*len = 20;
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SHA1Final(mac, &ctx->u.sha1);
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break;
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case CRYPTO_HASH_ALG_HMAC_MD5:
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if (*len < 16) {
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*len = 16;
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os_free(ctx);
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return -1;
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}
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*len = 16;
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MD5Final(mac, &ctx->u.md5);
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os_memcpy(k_pad, ctx->key, ctx->key_len);
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os_memset(k_pad + ctx->key_len, 0,
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sizeof(k_pad) - ctx->key_len);
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for (i = 0; i < sizeof(k_pad); i++)
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k_pad[i] ^= 0x5c;
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MD5Init(&ctx->u.md5);
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MD5Update(&ctx->u.md5, k_pad, sizeof(k_pad));
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MD5Update(&ctx->u.md5, mac, 16);
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MD5Final(mac, &ctx->u.md5);
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break;
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case CRYPTO_HASH_ALG_HMAC_SHA1:
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if (*len < 20) {
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*len = 20;
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os_free(ctx);
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return -1;
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}
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*len = 20;
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SHA1Final(mac, &ctx->u.sha1);
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os_memcpy(k_pad, ctx->key, ctx->key_len);
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os_memset(k_pad + ctx->key_len, 0,
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sizeof(k_pad) - ctx->key_len);
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for (i = 0; i < sizeof(k_pad); i++)
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k_pad[i] ^= 0x5c;
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SHA1Init(&ctx->u.sha1);
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SHA1Update(&ctx->u.sha1, k_pad, sizeof(k_pad));
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SHA1Update(&ctx->u.sha1, mac, 20);
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SHA1Final(mac, &ctx->u.sha1);
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break;
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}
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os_free(ctx);
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return 0;
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}
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struct crypto_cipher {
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enum crypto_cipher_alg alg;
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union {
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struct {
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size_t used_bytes;
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u8 key[16];
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size_t keylen;
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} rc4;
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struct {
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u8 cbc[32];
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size_t block_size;
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void *ctx_enc;
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void *ctx_dec;
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} aes;
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struct {
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struct des3_key_s key;
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u8 cbc[8];
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} des3;
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struct {
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u32 ek[32];
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u32 dk[32];
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u8 cbc[8];
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} des;
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} u;
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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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ctx = os_zalloc(sizeof(*ctx));
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if (ctx == NULL)
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return NULL;
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ctx->alg = alg;
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switch (alg) {
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case CRYPTO_CIPHER_ALG_RC4:
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if (key_len > sizeof(ctx->u.rc4.key)) {
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os_free(ctx);
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return NULL;
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}
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ctx->u.rc4.keylen = key_len;
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os_memcpy(ctx->u.rc4.key, key, key_len);
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break;
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case CRYPTO_CIPHER_ALG_AES:
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if (key_len > sizeof(ctx->u.aes.cbc)) {
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os_free(ctx);
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return NULL;
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}
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ctx->u.aes.ctx_enc = aes_encrypt_init(key, key_len);
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if (ctx->u.aes.ctx_enc == NULL) {
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os_free(ctx);
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return NULL;
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}
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ctx->u.aes.ctx_dec = aes_decrypt_init(key, key_len);
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if (ctx->u.aes.ctx_dec == NULL) {
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aes_encrypt_deinit(ctx->u.aes.ctx_enc);
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os_free(ctx);
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return NULL;
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}
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ctx->u.aes.block_size = key_len;
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os_memcpy(ctx->u.aes.cbc, iv, ctx->u.aes.block_size);
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break;
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case CRYPTO_CIPHER_ALG_3DES:
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if (key_len != 24) {
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os_free(ctx);
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return NULL;
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}
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des3_key_setup(key, &ctx->u.des3.key);
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os_memcpy(ctx->u.des3.cbc, iv, 8);
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break;
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case CRYPTO_CIPHER_ALG_DES:
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if (key_len != 8) {
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os_free(ctx);
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return NULL;
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}
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des_key_setup(key, ctx->u.des.ek, ctx->u.des.dk);
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os_memcpy(ctx->u.des.cbc, iv, 8);
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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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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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size_t i, j, blocks;
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switch (ctx->alg) {
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case CRYPTO_CIPHER_ALG_RC4:
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if (plain != crypt)
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os_memcpy(crypt, plain, len);
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rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
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ctx->u.rc4.used_bytes, crypt, len);
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ctx->u.rc4.used_bytes += len;
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break;
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case CRYPTO_CIPHER_ALG_AES:
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if (len % ctx->u.aes.block_size)
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return -1;
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blocks = len / ctx->u.aes.block_size;
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for (i = 0; i < blocks; i++) {
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for (j = 0; j < ctx->u.aes.block_size; j++)
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ctx->u.aes.cbc[j] ^= plain[j];
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aes_encrypt(ctx->u.aes.ctx_enc, ctx->u.aes.cbc,
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ctx->u.aes.cbc);
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os_memcpy(crypt, ctx->u.aes.cbc,
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ctx->u.aes.block_size);
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plain += ctx->u.aes.block_size;
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crypt += ctx->u.aes.block_size;
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}
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break;
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case CRYPTO_CIPHER_ALG_3DES:
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if (len % 8)
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return -1;
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blocks = len / 8;
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for (i = 0; i < blocks; i++) {
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for (j = 0; j < 8; j++)
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ctx->u.des3.cbc[j] ^= plain[j];
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des3_encrypt(ctx->u.des3.cbc, &ctx->u.des3.key,
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ctx->u.des3.cbc);
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os_memcpy(crypt, ctx->u.des3.cbc, 8);
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plain += 8;
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crypt += 8;
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}
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break;
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case CRYPTO_CIPHER_ALG_DES:
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if (len % 8)
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return -1;
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blocks = len / 8;
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for (i = 0; i < blocks; i++) {
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for (j = 0; j < 8; j++)
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ctx->u.des3.cbc[j] ^= plain[j];
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des_block_encrypt(ctx->u.des.cbc, ctx->u.des.ek,
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ctx->u.des.cbc);
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os_memcpy(crypt, ctx->u.des.cbc, 8);
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plain += 8;
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crypt += 8;
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}
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break;
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default:
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return -1;
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}
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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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size_t i, j, blocks;
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u8 tmp[32];
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switch (ctx->alg) {
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case CRYPTO_CIPHER_ALG_RC4:
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if (plain != crypt)
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os_memcpy(plain, crypt, len);
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rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
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ctx->u.rc4.used_bytes, plain, len);
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ctx->u.rc4.used_bytes += len;
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break;
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case CRYPTO_CIPHER_ALG_AES:
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if (len % ctx->u.aes.block_size)
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return -1;
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blocks = len / ctx->u.aes.block_size;
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for (i = 0; i < blocks; i++) {
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os_memcpy(tmp, crypt, ctx->u.aes.block_size);
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aes_decrypt(ctx->u.aes.ctx_dec, crypt, plain);
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for (j = 0; j < ctx->u.aes.block_size; j++)
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plain[j] ^= ctx->u.aes.cbc[j];
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os_memcpy(ctx->u.aes.cbc, tmp, ctx->u.aes.block_size);
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plain += ctx->u.aes.block_size;
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crypt += ctx->u.aes.block_size;
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}
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break;
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case CRYPTO_CIPHER_ALG_3DES:
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if (len % 8)
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return -1;
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blocks = len / 8;
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for (i = 0; i < blocks; i++) {
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os_memcpy(tmp, crypt, 8);
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des3_decrypt(crypt, &ctx->u.des3.key, plain);
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for (j = 0; j < 8; j++)
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plain[j] ^= ctx->u.des3.cbc[j];
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os_memcpy(ctx->u.des3.cbc, tmp, 8);
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plain += 8;
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crypt += 8;
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}
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break;
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case CRYPTO_CIPHER_ALG_DES:
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if (len % 8)
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return -1;
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blocks = len / 8;
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for (i = 0; i < blocks; i++) {
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os_memcpy(tmp, crypt, 8);
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des_block_decrypt(crypt, ctx->u.des.dk, plain);
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for (j = 0; j < 8; j++)
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plain[j] ^= ctx->u.des.cbc[j];
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os_memcpy(ctx->u.des.cbc, tmp, 8);
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plain += 8;
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crypt += 8;
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}
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break;
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default:
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return -1;
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}
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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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switch (ctx->alg) {
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case CRYPTO_CIPHER_ALG_AES:
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aes_encrypt_deinit(ctx->u.aes.ctx_enc);
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aes_decrypt_deinit(ctx->u.aes.ctx_dec);
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break;
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case CRYPTO_CIPHER_ALG_3DES:
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break;
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default:
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break;
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}
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os_free(ctx);
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}
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/* Dummy structures; these are just typecast to struct crypto_rsa_key */
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struct crypto_public_key;
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struct crypto_private_key;
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struct crypto_public_key * crypto_public_key_import(const u8 *key, size_t len)
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{
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return (struct crypto_public_key *)
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crypto_rsa_import_public_key(key, len);
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}
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struct crypto_private_key * crypto_private_key_import(const u8 *key,
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size_t len,
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const char *passwd)
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{
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struct crypto_private_key *res;
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/* First, check for possible PKCS #8 encoding */
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res = pkcs8_key_import(key, len);
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if (res)
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return res;
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if (passwd) {
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/* Try to parse as encrypted PKCS #8 */
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res = pkcs8_enc_key_import(key, len, passwd);
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if (res)
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return res;
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}
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/* Not PKCS#8, so try to import PKCS #1 encoded RSA private key */
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wpa_printf(MSG_DEBUG, "Trying to parse PKCS #1 encoded RSA private "
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"key");
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return (struct crypto_private_key *)
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crypto_rsa_import_private_key(key, len);
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}
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struct crypto_public_key * crypto_public_key_from_cert(const u8 *buf,
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size_t len)
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{
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/* No X.509 support in crypto_internal.c */
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return NULL;
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}
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int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
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const u8 *in, size_t inlen,
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u8 *out, size_t *outlen)
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{
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return pkcs1_encrypt(2, (struct crypto_rsa_key *) key,
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0, in, inlen, out, outlen);
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}
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int crypto_private_key_decrypt_pkcs1_v15(struct crypto_private_key *key,
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const u8 *in, size_t inlen,
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u8 *out, size_t *outlen)
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{
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return pkcs1_v15_private_key_decrypt((struct crypto_rsa_key *) key,
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in, inlen, out, outlen);
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}
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|
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int crypto_private_key_sign_pkcs1(struct crypto_private_key *key,
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const u8 *in, size_t inlen,
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u8 *out, size_t *outlen)
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{
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return pkcs1_encrypt(1, (struct crypto_rsa_key *) key,
|
|
1, in, inlen, out, outlen);
|
|
}
|
|
|
|
|
|
void crypto_public_key_free(struct crypto_public_key *key)
|
|
{
|
|
crypto_rsa_free((struct crypto_rsa_key *) key);
|
|
}
|
|
|
|
|
|
void crypto_private_key_free(struct crypto_private_key *key)
|
|
{
|
|
crypto_rsa_free((struct crypto_rsa_key *) key);
|
|
}
|
|
|
|
|
|
int crypto_public_key_decrypt_pkcs1(struct crypto_public_key *key,
|
|
const u8 *crypt, size_t crypt_len,
|
|
u8 *plain, size_t *plain_len)
|
|
{
|
|
return pkcs1_decrypt_public_key((struct crypto_rsa_key *) key,
|
|
crypt, crypt_len, plain, plain_len);
|
|
}
|
|
|
|
|
|
int crypto_global_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
void crypto_global_deinit(void)
|
|
{
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_MODEXP
|
|
|
|
int crypto_mod_exp(const u8 *base, size_t base_len,
|
|
const u8 *power, size_t power_len,
|
|
const u8 *modulus, size_t modulus_len,
|
|
u8 *result, size_t *result_len)
|
|
{
|
|
struct bignum *bn_base, *bn_exp, *bn_modulus, *bn_result;
|
|
int ret = -1;
|
|
|
|
bn_base = bignum_init();
|
|
bn_exp = bignum_init();
|
|
bn_modulus = bignum_init();
|
|
bn_result = bignum_init();
|
|
|
|
if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
|
|
bn_result == NULL)
|
|
goto error;
|
|
|
|
if (bignum_set_unsigned_bin(bn_base, base, base_len) < 0 ||
|
|
bignum_set_unsigned_bin(bn_exp, power, power_len) < 0 ||
|
|
bignum_set_unsigned_bin(bn_modulus, modulus, modulus_len) < 0)
|
|
goto error;
|
|
|
|
if (bignum_exptmod(bn_base, bn_exp, bn_modulus, bn_result) < 0)
|
|
goto error;
|
|
|
|
ret = bignum_get_unsigned_bin(bn_result, result, result_len);
|
|
|
|
error:
|
|
bignum_deinit(bn_base);
|
|
bignum_deinit(bn_exp);
|
|
bignum_deinit(bn_modulus);
|
|
bignum_deinit(bn_result);
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_MODEXP */
|