Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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244 lines
7.4 KiB
244 lines
7.4 KiB
/* ==================================================================== |
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* Copyright (c) 2011 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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#include <openssl/evp.h> |
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#include <string.h> |
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#include <openssl/aes.h> |
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#include <openssl/cipher.h> |
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#include "../../crypto/fipsmodule/cipher/internal.h" |
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#include "../../crypto/fipsmodule/modes/internal.h" |
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typedef struct xts128_context { |
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AES_KEY *key1, *key2; |
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block128_f block1, block2; |
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} XTS128_CONTEXT; |
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static size_t CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, |
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const uint8_t iv[16], const uint8_t *inp, |
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uint8_t *out, size_t len, int enc) { |
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union { |
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uint64_t u[2]; |
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uint32_t d[4]; |
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uint8_t c[16]; |
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} tweak, scratch; |
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unsigned int i; |
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if (len < 16) return 0; |
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OPENSSL_memcpy(tweak.c, iv, 16); |
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(*ctx->block2)(tweak.c, tweak.c, ctx->key2); |
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if (!enc && (len % 16)) len -= 16; |
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while (len >= 16) { |
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OPENSSL_memcpy(scratch.c, inp, 16); |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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(*ctx->block1)(scratch.c, scratch.c, ctx->key1); |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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OPENSSL_memcpy(out, scratch.c, 16); |
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inp += 16; |
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out += 16; |
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len -= 16; |
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if (len == 0) return 1; |
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unsigned int carry, res; |
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res = 0x87 & (((int)tweak.d[3]) >> 31); |
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carry = (unsigned int)(tweak.u[0] >> 63); |
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tweak.u[0] = (tweak.u[0] << 1) ^ res; |
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tweak.u[1] = (tweak.u[1] << 1) | carry; |
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} |
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if (enc) { |
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for (i = 0; i < len; ++i) { |
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uint8_t c = inp[i]; |
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out[i] = scratch.c[i]; |
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scratch.c[i] = c; |
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} |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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(*ctx->block1)(scratch.c, scratch.c, ctx->key1); |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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OPENSSL_memcpy(out - 16, scratch.c, 16); |
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} else { |
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union { |
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uint64_t u[2]; |
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uint8_t c[16]; |
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} tweak1; |
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unsigned int carry, res; |
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res = 0x87 & (((int)tweak.d[3]) >> 31); |
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carry = (unsigned int)(tweak.u[0] >> 63); |
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tweak1.u[0] = (tweak.u[0] << 1) ^ res; |
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tweak1.u[1] = (tweak.u[1] << 1) | carry; |
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OPENSSL_memcpy(scratch.c, inp, 16); |
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scratch.u[0] ^= tweak1.u[0]; |
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scratch.u[1] ^= tweak1.u[1]; |
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(*ctx->block1)(scratch.c, scratch.c, ctx->key1); |
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scratch.u[0] ^= tweak1.u[0]; |
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scratch.u[1] ^= tweak1.u[1]; |
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for (i = 0; i < len; ++i) { |
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uint8_t c = inp[16 + i]; |
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out[16 + i] = scratch.c[i]; |
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scratch.c[i] = c; |
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} |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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(*ctx->block1)(scratch.c, scratch.c, ctx->key1); |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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OPENSSL_memcpy(out, scratch.c, 16); |
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} |
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return 1; |
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} |
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typedef struct { |
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union { |
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double align; |
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AES_KEY ks; |
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} ks1, ks2; // AES key schedules to use |
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XTS128_CONTEXT xts; |
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} EVP_AES_XTS_CTX; |
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static int aes_xts_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key, |
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const uint8_t *iv, int enc) { |
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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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} |
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if (key) { |
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// key_len is two AES keys |
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if (enc) { |
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AES_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1.ks); |
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xctx->xts.block1 = AES_encrypt; |
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} else { |
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AES_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1.ks); |
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xctx->xts.block1 = AES_decrypt; |
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} |
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AES_set_encrypt_key(key + ctx->key_len / 2, |
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ctx->key_len * 4, &xctx->ks2.ks); |
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xctx->xts.block2 = AES_encrypt; |
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xctx->xts.key1 = &xctx->ks1.ks; |
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} |
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if (iv) { |
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xctx->xts.key2 = &xctx->ks2.ks; |
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OPENSSL_memcpy(ctx->iv, iv, 16); |
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} |
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return 1; |
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} |
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static int aes_xts_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, |
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const uint8_t *in, size_t len) { |
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EVP_AES_XTS_CTX *xctx = ctx->cipher_data; |
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if (!xctx->xts.key1 || |
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!xctx->xts.key2 || |
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!out || |
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!in || |
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len < AES_BLOCK_SIZE || |
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!CRYPTO_xts128_encrypt(&xctx->xts, ctx->iv, in, out, len, ctx->encrypt)) { |
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return 0; |
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} |
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return 1; |
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} |
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static int aes_xts_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) { |
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EVP_AES_XTS_CTX *xctx = c->cipher_data; |
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if (type == EVP_CTRL_COPY) { |
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EVP_CIPHER_CTX *out = ptr; |
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EVP_AES_XTS_CTX *xctx_out = out->cipher_data; |
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if (xctx->xts.key1) { |
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if (xctx->xts.key1 != &xctx->ks1.ks) { |
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return 0; |
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} |
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xctx_out->xts.key1 = &xctx_out->ks1.ks; |
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} |
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if (xctx->xts.key2) { |
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if (xctx->xts.key2 != &xctx->ks2.ks) { |
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return 0; |
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} |
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xctx_out->xts.key2 = &xctx_out->ks2.ks; |
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} |
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return 1; |
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} else if (type != EVP_CTRL_INIT) { |
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return -1; |
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} |
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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 const EVP_CIPHER aes_256_xts = { |
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.nid = NID_aes_256_xts, |
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.block_size = 1, |
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.key_len = 64 /* 2 AES-256 keys */, |
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.iv_len = 16, |
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.ctx_size = sizeof(EVP_AES_XTS_CTX), |
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.flags = EVP_CIPH_XTS_MODE | EVP_CIPH_CUSTOM_IV | |
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EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | |
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EVP_CIPH_CUSTOM_COPY, |
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.init = aes_xts_init_key, |
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.cipher = aes_xts_cipher, |
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.ctrl = aes_xts_ctrl}; |
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const EVP_CIPHER *EVP_aes_256_xts(void) { return &aes_256_xts; }
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