572 lines
14 KiB
C
572 lines
14 KiB
C
/* ====================================================================
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* Copyright (c) 2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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*/
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#define OPENSSL_FIPSAPI
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#include <openssl/opensslconf.h>
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#ifndef OPENSSL_NO_AES
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <string.h>
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#include <assert.h>
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#include <openssl/aes.h>
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#include "evp_locl.h"
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#include "modes_lcl.h"
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#include <openssl/rand.h>
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static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc);
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typedef struct
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{
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AES_KEY ks;
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} EVP_AES_KEY;
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#define data(ctx) EVP_C_DATA(EVP_AES_KEY,ctx)
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IMPLEMENT_BLOCK_CIPHER(aes_128, ks, AES, EVP_AES_KEY,
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NID_aes_128, 16, 16, 16, 128,
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EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
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aes_init_key, NULL, NULL, NULL, NULL)
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IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
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NID_aes_192, 16, 24, 16, 128,
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EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
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aes_init_key, NULL, NULL, NULL, NULL)
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IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
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NID_aes_256, 16, 32, 16, 128,
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EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1,
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aes_init_key, NULL, NULL, NULL, NULL)
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#define IMPLEMENT_AES_CFBR(ksize,cbits) IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16,EVP_CIPH_FLAG_FIPS)
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IMPLEMENT_AES_CFBR(128,1)
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IMPLEMENT_AES_CFBR(192,1)
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IMPLEMENT_AES_CFBR(256,1)
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IMPLEMENT_AES_CFBR(128,8)
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IMPLEMENT_AES_CFBR(192,8)
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IMPLEMENT_AES_CFBR(256,8)
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static int aes_counter (EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len)
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{
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unsigned int num;
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num = ctx->num;
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#ifdef AES_CTR_ASM
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void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
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size_t blocks, const AES_KEY *key,
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const unsigned char ivec[AES_BLOCK_SIZE]);
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CRYPTO_ctr128_encrypt_ctr32(in,out,len,
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&((EVP_AES_KEY *)ctx->cipher_data)->ks,
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ctx->iv,ctx->buf,&num,(ctr128_f)AES_ctr32_encrypt);
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#else
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CRYPTO_ctr128_encrypt(in,out,len,
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&((EVP_AES_KEY *)ctx->cipher_data)->ks,
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ctx->iv,ctx->buf,&num,(block128_f)AES_encrypt);
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#endif
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ctx->num = (size_t)num;
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return 1;
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}
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static const EVP_CIPHER aes_128_ctr_cipher=
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{
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NID_aes_128_ctr,1,16,16,
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EVP_CIPH_CTR_MODE|EVP_CIPH_FLAG_FIPS,
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aes_init_key,
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aes_counter,
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NULL,
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sizeof(EVP_AES_KEY),
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NULL,
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NULL,
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NULL,
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NULL
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};
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const EVP_CIPHER *EVP_aes_128_ctr (void)
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{ return &aes_128_ctr_cipher; }
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static const EVP_CIPHER aes_192_ctr_cipher=
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{
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NID_aes_192_ctr,1,24,16,
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EVP_CIPH_CTR_MODE|EVP_CIPH_FLAG_FIPS,
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aes_init_key,
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aes_counter,
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NULL,
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sizeof(EVP_AES_KEY),
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NULL,
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NULL,
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NULL,
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NULL
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};
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const EVP_CIPHER *EVP_aes_192_ctr (void)
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{ return &aes_192_ctr_cipher; }
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static const EVP_CIPHER aes_256_ctr_cipher=
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{
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NID_aes_256_ctr,1,32,16,
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EVP_CIPH_CTR_MODE|EVP_CIPH_FLAG_FIPS,
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aes_init_key,
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aes_counter,
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NULL,
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sizeof(EVP_AES_KEY),
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NULL,
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NULL,
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NULL,
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NULL
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};
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const EVP_CIPHER *EVP_aes_256_ctr (void)
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{ return &aes_256_ctr_cipher; }
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static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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int ret;
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if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
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|| (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
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&& !enc)
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ret=AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
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else
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ret=AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
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if(ret < 0)
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{
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EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
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return 0;
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}
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return 1;
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}
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typedef struct
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{
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/* AES key schedule to use */
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AES_KEY ks;
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/* Set if key initialised */
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int key_set;
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/* Set if an iv is set */
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int iv_set;
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GCM128_CONTEXT gcm;
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/* Temporary IV store */
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unsigned char *iv;
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/* IV length */
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int ivlen;
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int taglen;
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/* It is OK to generate IVs */
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int iv_gen;
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} EVP_AES_GCM_CTX;
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static int aes_gcm_cleanup(EVP_CIPHER_CTX *c)
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{
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EVP_AES_GCM_CTX *gctx = c->cipher_data;
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OPENSSL_cleanse(&gctx->gcm, sizeof(gctx->gcm));
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if (gctx->iv != c->iv)
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OPENSSL_free(gctx->iv);
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return 1;
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}
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/* increment counter (64-bit int) by 1 */
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static void ctr64_inc(unsigned char *counter) {
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int n=8;
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unsigned char c;
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do {
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--n;
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c = counter[n];
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++c;
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counter[n] = c;
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if (c) return;
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} while (n);
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}
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static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
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{
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EVP_AES_GCM_CTX *gctx = c->cipher_data;
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switch (type)
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{
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case EVP_CTRL_INIT:
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gctx->key_set = 0;
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gctx->iv_set = 0;
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gctx->ivlen = c->cipher->iv_len;
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gctx->iv = c->iv;
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gctx->taglen = -1;
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gctx->iv_gen = 0;
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return 1;
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case EVP_CTRL_GCM_SET_IVLEN:
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if (arg <= 0)
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return 0;
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#ifdef OPENSSL_FIPS
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if (FIPS_mode() && !(c->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)
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&& arg < 12)
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return 0;
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#endif
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/* Allocate memory for IV if needed */
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if ((arg > EVP_MAX_IV_LENGTH) && (arg > gctx->ivlen))
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{
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if (gctx->iv != c->iv)
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OPENSSL_free(gctx->iv);
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gctx->iv = OPENSSL_malloc(arg);
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if (!gctx->iv)
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return 0;
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}
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gctx->ivlen = arg;
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return 1;
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case EVP_CTRL_GCM_SET_TAG:
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if (arg <= 0 || arg > 16 || c->encrypt)
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return 0;
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memcpy(c->buf, ptr, arg);
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gctx->taglen = arg;
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return 1;
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case EVP_CTRL_GCM_GET_TAG:
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if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0)
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return 0;
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memcpy(ptr, c->buf, arg);
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return 1;
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case EVP_CTRL_GCM_SET_IV_FIXED:
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/* Special case: -1 length restores whole IV */
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if (arg == -1)
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{
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memcpy(gctx->iv, ptr, gctx->ivlen);
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gctx->iv_gen = 1;
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return 1;
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}
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/* Fixed field must be at least 4 bytes and invocation field
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* at least 8.
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*/
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if ((arg < 4) || (gctx->ivlen - arg) < 8)
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return 0;
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if (arg)
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memcpy(gctx->iv, ptr, arg);
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if (RAND_bytes(gctx->iv + arg, gctx->ivlen - arg) <= 0)
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return 0;
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gctx->iv_gen = 1;
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return 1;
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case EVP_CTRL_GCM_IV_GEN:
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if (gctx->iv_gen == 0 || gctx->key_set == 0)
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return 0;
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CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
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memcpy(ptr, gctx->iv, gctx->ivlen);
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/* Invocation field will be at least 8 bytes in size and
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* so no need to check wrap around or increment more than
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* last 8 bytes.
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*/
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ctr64_inc(gctx->iv + gctx->ivlen - 8);
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gctx->iv_set = 1;
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return 1;
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default:
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return -1;
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}
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}
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static int aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
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if (!iv && !key)
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return 1;
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if (key)
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{
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AES_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks);
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CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, (block128_f)AES_encrypt);
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/* If we have an iv can set it directly, otherwise use
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* saved IV.
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*/
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if (iv == NULL && gctx->iv_set)
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iv = gctx->iv;
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if (iv)
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{
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CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
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gctx->iv_set = 1;
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}
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gctx->key_set = 1;
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}
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else
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{
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/* If key set use IV, otherwise copy */
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if (gctx->key_set)
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CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
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else
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memcpy(gctx->iv, iv, gctx->ivlen);
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gctx->iv_set = 1;
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gctx->iv_gen = 0;
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}
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return 1;
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}
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static int aes_gcm(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len)
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{
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EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
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/* If not set up, return error */
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if (!gctx->iv_set && !gctx->key_set)
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return -1;
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if (!ctx->encrypt && gctx->taglen < 0)
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return -1;
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if (in)
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{
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if (out == NULL)
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{
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if (CRYPTO_gcm128_aad(&gctx->gcm, in, len))
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return -1;
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}
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else if (ctx->encrypt)
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{
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if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len))
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return -1;
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}
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else
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{
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if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len))
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return -1;
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}
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return len;
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}
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else
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{
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if (!ctx->encrypt)
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{
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if (CRYPTO_gcm128_finish(&gctx->gcm,
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ctx->buf, gctx->taglen) != 0)
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return -1;
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gctx->iv_set = 0;
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return 0;
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}
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CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
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gctx->taglen = 16;
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/* Don't reuse the IV */
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gctx->iv_set = 0;
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return 0;
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}
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}
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static const EVP_CIPHER aes_128_gcm_cipher=
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{
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NID_aes_128_gcm,1,16,12,
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EVP_CIPH_GCM_MODE|EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1
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| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER
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| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT,
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aes_gcm_init_key,
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aes_gcm,
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aes_gcm_cleanup,
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sizeof(EVP_AES_GCM_CTX),
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NULL,
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NULL,
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aes_gcm_ctrl,
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NULL
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};
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const EVP_CIPHER *EVP_aes_128_gcm (void)
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{ return &aes_128_gcm_cipher; }
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static const EVP_CIPHER aes_192_gcm_cipher=
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{
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NID_aes_128_gcm,1,24,12,
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EVP_CIPH_GCM_MODE|EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1
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| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER
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| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT,
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aes_gcm_init_key,
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aes_gcm,
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aes_gcm_cleanup,
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sizeof(EVP_AES_GCM_CTX),
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NULL,
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NULL,
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aes_gcm_ctrl,
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NULL
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};
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const EVP_CIPHER *EVP_aes_192_gcm (void)
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{ return &aes_192_gcm_cipher; }
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static const EVP_CIPHER aes_256_gcm_cipher=
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{
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NID_aes_128_gcm,1,32,12,
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EVP_CIPH_GCM_MODE|EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1
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| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER
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| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT,
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aes_gcm_init_key,
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aes_gcm,
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aes_gcm_cleanup,
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sizeof(EVP_AES_GCM_CTX),
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NULL,
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NULL,
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aes_gcm_ctrl,
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NULL
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};
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const EVP_CIPHER *EVP_aes_256_gcm (void)
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{ return &aes_256_gcm_cipher; }
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typedef struct
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{
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/* AES key schedules to use */
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AES_KEY ks1, ks2;
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XTS128_CONTEXT xts;
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} EVP_AES_XTS_CTX;
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static int aes_xts_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
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{
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EVP_AES_XTS_CTX *xctx = c->cipher_data;
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if (type != EVP_CTRL_INIT)
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return -1;
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/* key1 and key2 are used as an indicator both key and IV are set */
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xctx->xts.key1 = NULL;
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xctx->xts.key2 = NULL;
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return 1;
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}
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static int aes_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
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if (!iv && !key)
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return 1;
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if (key)
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{
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/* key_len is two AES keys */
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if (ctx->encrypt)
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{
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AES_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1);
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xctx->xts.block1 = (block128_f)AES_encrypt;
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}
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else
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{
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AES_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1);
|
|
xctx->xts.block1 = (block128_f)AES_decrypt;
|
|
}
|
|
|
|
AES_set_encrypt_key(key + ctx->key_len/2,
|
|
ctx->key_len * 4, &xctx->ks2);
|
|
xctx->xts.block2 = (block128_f)AES_encrypt;
|
|
|
|
xctx->xts.key1 = &xctx->ks1;
|
|
}
|
|
|
|
if (iv)
|
|
{
|
|
xctx->xts.key2 = &xctx->ks2;
|
|
memcpy(ctx->iv, iv, 16);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int aes_xts(EVP_CIPHER_CTX *ctx, unsigned char *out,
|
|
const unsigned char *in, size_t len)
|
|
{
|
|
EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
|
|
if (!xctx->xts.key1 || !xctx->xts.key2)
|
|
return -1;
|
|
if (!out || !in)
|
|
return -1;
|
|
#ifdef OPENSSL_FIPS
|
|
/* Requirement of SP800-38E */
|
|
if (FIPS_mode() && len > (1L<<20)*16)
|
|
{
|
|
EVPerr(EVP_F_AES_XTS, EVP_R_TOO_LARGE);
|
|
return -1;
|
|
}
|
|
#endif
|
|
if (CRYPTO_xts128_encrypt(&xctx->xts, ctx->iv, in, out, len,
|
|
ctx->encrypt))
|
|
return -1;
|
|
return len;
|
|
}
|
|
|
|
static const EVP_CIPHER aes_128_xts_cipher=
|
|
{
|
|
NID_aes_128_xts,16,32,16,
|
|
EVP_CIPH_XTS_MODE|EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1
|
|
| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER
|
|
| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT,
|
|
aes_xts_init_key,
|
|
aes_xts,
|
|
0,
|
|
sizeof(EVP_AES_XTS_CTX),
|
|
NULL,
|
|
NULL,
|
|
aes_xts_ctrl,
|
|
NULL
|
|
};
|
|
|
|
const EVP_CIPHER *EVP_aes_128_xts (void)
|
|
{ return &aes_128_xts_cipher; }
|
|
|
|
static const EVP_CIPHER aes_256_xts_cipher=
|
|
{
|
|
NID_aes_256_xts,16,64,16,
|
|
EVP_CIPH_XTS_MODE|EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_DEFAULT_ASN1
|
|
| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER
|
|
| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT,
|
|
aes_xts_init_key,
|
|
aes_xts,
|
|
0,
|
|
sizeof(EVP_AES_XTS_CTX),
|
|
NULL,
|
|
NULL,
|
|
aes_xts_ctrl,
|
|
NULL
|
|
};
|
|
|
|
const EVP_CIPHER *EVP_aes_256_xts (void)
|
|
{ return &aes_256_xts_cipher; }
|
|
|
|
#endif
|