671 lines
14 KiB
C
671 lines
14 KiB
C
/*
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* WPA Supplicant / Crypto wrapper for internal crypto implementation
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* Copyright (c) 2006, 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 "rc4.h"
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#include "aes.h"
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#include "rsa.h"
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#include "bignum.h"
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#ifdef EAP_TLS_FUNCS
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#ifdef CONFIG_TLS_INTERNAL
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/* from des.c */
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struct des3_key_s {
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u32 ek[3][32];
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u32 dk[3][32];
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};
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void des3_key_setup(const u8 *key, struct des3_key_s *dkey);
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void des3_encrypt(const u8 *plain, const struct des3_key_s *key, u8 *crypt);
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void des3_decrypt(const u8 *crypt, const struct des3_key_s *key, u8 *plain);
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struct MD5Context {
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u32 buf[4];
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u32 bits[2];
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u8 in[64];
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};
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struct SHA1Context {
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u32 state[5];
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u32 count[2];
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unsigned char buffer[64];
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};
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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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} 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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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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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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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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{
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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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static int pkcs1_generate_encryption_block(u8 block_type, size_t modlen,
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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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size_t ps_len;
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u8 *pos;
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/*
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* PKCS #1 v1.5, 8.1:
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*
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* EB = 00 || BT || PS || 00 || D
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* BT = 00 or 01 for private-key operation; 02 for public-key operation
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* PS = k-3-||D||; at least eight octets
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* (BT=0: PS=0x00, BT=1: PS=0xff, BT=2: PS=pseudorandom non-zero)
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* k = length of modulus in octets (modlen)
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*/
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if (modlen < 12 || modlen > *outlen || inlen > modlen - 11) {
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wpa_printf(MSG_DEBUG, "PKCS #1: %s - Invalid buffer "
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"lengths (modlen=%lu outlen=%lu inlen=%lu)",
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__func__, (unsigned long) modlen,
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(unsigned long) *outlen,
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(unsigned long) inlen);
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return -1;
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}
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pos = out;
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*pos++ = 0x00;
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*pos++ = block_type; /* BT */
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ps_len = modlen - inlen - 3;
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switch (block_type) {
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case 0:
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os_memset(pos, 0x00, ps_len);
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pos += ps_len;
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break;
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case 1:
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os_memset(pos, 0xff, ps_len);
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pos += ps_len;
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break;
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case 2:
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if (os_get_random(pos, ps_len) < 0) {
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wpa_printf(MSG_DEBUG, "PKCS #1: %s - Failed to get "
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"random data for PS", __func__);
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return -1;
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}
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while (ps_len--) {
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if (*pos == 0x00)
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*pos = 0x01;
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pos++;
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}
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break;
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default:
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wpa_printf(MSG_DEBUG, "PKCS #1: %s - Unsupported block type "
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"%d", __func__, block_type);
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return -1;
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}
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*pos++ = 0x00;
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os_memcpy(pos, in, inlen); /* D */
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return 0;
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}
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static int crypto_rsa_encrypt_pkcs1(int block_type, struct crypto_rsa_key *key,
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int use_private,
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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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size_t modlen;
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modlen = crypto_rsa_get_modulus_len(key);
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if (pkcs1_generate_encryption_block(block_type, modlen, in, inlen,
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out, outlen) < 0)
|
|
return -1;
|
|
|
|
return crypto_rsa_exptmod(out, modlen, out, outlen, key, use_private);
|
|
}
|
|
|
|
|
|
int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
|
|
const u8 *in, size_t inlen,
|
|
u8 *out, size_t *outlen)
|
|
{
|
|
return crypto_rsa_encrypt_pkcs1(2, (struct crypto_rsa_key *) key,
|
|
0, in, inlen, out, outlen);
|
|
}
|
|
|
|
|
|
int crypto_private_key_sign_pkcs1(struct crypto_private_key *key,
|
|
const u8 *in, size_t inlen,
|
|
u8 *out, size_t *outlen)
|
|
{
|
|
return crypto_rsa_encrypt_pkcs1(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)
|
|
{
|
|
size_t len;
|
|
u8 *pos;
|
|
|
|
len = *plain_len;
|
|
if (crypto_rsa_exptmod(crypt, crypt_len, plain, &len,
|
|
(struct crypto_rsa_key *) key, 0) < 0)
|
|
return -1;
|
|
|
|
/*
|
|
* PKCS #1 v1.5, 8.1:
|
|
*
|
|
* EB = 00 || BT || PS || 00 || D
|
|
* BT = 01
|
|
* PS = k-3-||D|| times FF
|
|
* k = length of modulus in octets
|
|
*/
|
|
|
|
if (len < 3 + 8 + 16 /* min hash len */ ||
|
|
plain[0] != 0x00 || plain[1] != 0x01 || plain[2] != 0xff) {
|
|
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
|
|
"structure");
|
|
return -1;
|
|
}
|
|
|
|
pos = plain + 3;
|
|
while (pos < plain + len && *pos == 0xff)
|
|
pos++;
|
|
if (pos - plain - 2 < 8) {
|
|
/* PKCS #1 v1.5, 8.1: At least eight octets long PS */
|
|
wpa_printf(MSG_INFO, "LibTomCrypt: Too short signature "
|
|
"padding");
|
|
return -1;
|
|
}
|
|
|
|
if (pos + 16 /* min hash len */ >= plain + len || *pos != 0x00) {
|
|
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
|
|
"structure (2)");
|
|
return -1;
|
|
}
|
|
pos++;
|
|
len -= pos - plain;
|
|
|
|
/* Strip PKCS #1 header */
|
|
os_memmove(plain, pos, len);
|
|
*plain_len = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int crypto_global_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
void crypto_global_deinit(void)
|
|
{
|
|
}
|
|
|
|
|
|
#ifdef EAP_FAST
|
|
|
|
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 = 0;
|
|
|
|
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 /* EAP_FAST */
|
|
|
|
|
|
#endif /* CONFIG_TLS_INTERNAL */
|
|
|
|
#endif /* EAP_TLS_FUNCS */
|