--- /dev/null
+/* ====================================================================
+ * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ==================================================================== */
+
+#include <assert.h>
+#include <string.h>
+
+#include "internal.h"
+
+
+void CRYPTO_cbc128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
+ const void *key, uint8_t ivec[16],
+ block128_f block) {
+ size_t n;
+ const uint8_t *iv = ivec;
+
+ assert(key != NULL && ivec != NULL);
+ assert(len == 0 || (in != NULL && out != NULL));
+
+ if (STRICT_ALIGNMENT &&
+ ((uintptr_t)in | (uintptr_t)out | (uintptr_t)ivec) % sizeof(size_t) !=
+ 0) {
+ while (len >= 16) {
+ for (n = 0; n < 16; ++n) {
+ out[n] = in[n] ^ iv[n];
+ }
+ (*block)(out, out, key);
+ iv = out;
+ len -= 16;
+ in += 16;
+ out += 16;
+ }
+ } else {
+ while (len >= 16) {
+ for (n = 0; n < 16; n += sizeof(size_t)) {
+ store_word_le(out + n, load_word_le(in + n) ^ load_word_le(iv + n));
+ }
+ (*block)(out, out, key);
+ iv = out;
+ len -= 16;
+ in += 16;
+ out += 16;
+ }
+ }
+
+ while (len) {
+ for (n = 0; n < 16 && n < len; ++n) {
+ out[n] = in[n] ^ iv[n];
+ }
+ for (; n < 16; ++n) {
+ out[n] = iv[n];
+ }
+ (*block)(out, out, key);
+ iv = out;
+ if (len <= 16) {
+ break;
+ }
+ len -= 16;
+ in += 16;
+ out += 16;
+ }
+
+ OPENSSL_memcpy(ivec, iv, 16);
+}
+
+void CRYPTO_cbc128_decrypt(const uint8_t *in, uint8_t *out, size_t len,
+ const void *key, uint8_t ivec[16],
+ block128_f block) {
+ size_t n;
+ union {
+ size_t t[16 / sizeof(size_t)];
+ uint8_t c[16];
+ } tmp;
+
+ assert(key != NULL && ivec != NULL);
+ assert(len == 0 || (in != NULL && out != NULL));
+
+ const uintptr_t inptr = (uintptr_t) in;
+ const uintptr_t outptr = (uintptr_t) out;
+ // If |in| and |out| alias, |in| must be ahead.
+ assert(inptr >= outptr || inptr + len <= outptr);
+
+ if ((inptr >= 32 && outptr <= inptr - 32) || inptr < outptr) {
+ // If |out| is at least two blocks behind |in| or completely disjoint, there
+ // is no need to decrypt to a temporary block.
+ const uint8_t *iv = ivec;
+
+ if (STRICT_ALIGNMENT &&
+ ((uintptr_t)in | (uintptr_t)out | (uintptr_t)ivec) % sizeof(size_t) !=
+ 0) {
+ while (len >= 16) {
+ (*block)(in, out, key);
+ for (n = 0; n < 16; ++n) {
+ out[n] ^= iv[n];
+ }
+ iv = in;
+ len -= 16;
+ in += 16;
+ out += 16;
+ }
+ } else if (16 % sizeof(size_t) == 0) { // always true
+ while (len >= 16) {
+ (*block)(in, out, key);
+ for (n = 0; n < 16; n += sizeof(size_t)) {
+ store_word_le(out + n, load_word_le(out + n) ^ load_word_le(iv + n));
+ }
+ iv = in;
+ len -= 16;
+ in += 16;
+ out += 16;
+ }
+ }
+ OPENSSL_memcpy(ivec, iv, 16);
+ } else {
+ // |out| is less than two blocks behind |in|. Decrypting an input block
+ // directly to |out| would overwrite a ciphertext block before it is used as
+ // the next block's IV. Decrypt to a temporary block instead.
+ if (STRICT_ALIGNMENT &&
+ ((uintptr_t)in | (uintptr_t)out | (uintptr_t)ivec) % sizeof(size_t) !=
+ 0) {
+ uint8_t c;
+ while (len >= 16) {
+ (*block)(in, tmp.c, key);
+ for (n = 0; n < 16; ++n) {
+ c = in[n];
+ out[n] = tmp.c[n] ^ ivec[n];
+ ivec[n] = c;
+ }
+ len -= 16;
+ in += 16;
+ out += 16;
+ }
+ } else if (16 % sizeof(size_t) == 0) { // always true
+ while (len >= 16) {
+ (*block)(in, tmp.c, key);
+ for (n = 0; n < 16; n += sizeof(size_t)) {
+ size_t c = load_word_le(in + n);
+ store_word_le(out + n,
+ tmp.t[n / sizeof(size_t)] ^ load_word_le(ivec + n));
+ store_word_le(ivec + n, c);
+ }
+ len -= 16;
+ in += 16;
+ out += 16;
+ }
+ }
+ }
+
+ while (len) {
+ uint8_t c;
+ (*block)(in, tmp.c, key);
+ for (n = 0; n < 16 && n < len; ++n) {
+ c = in[n];
+ out[n] = tmp.c[n] ^ ivec[n];
+ ivec[n] = c;
+ }
+ if (len <= 16) {
+ for (; n < 16; ++n) {
+ ivec[n] = in[n];
+ }
+ break;
+ }
+ len -= 16;
+ in += 16;
+ out += 16;
+ }
+}
git://repos.xcallymotion.com / motion2.git / blobdiff