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Diffstat (limited to 'thirdparty/openssl/crypto/modes/ctr128.c')
| -rw-r--r-- | thirdparty/openssl/crypto/modes/ctr128.c | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/thirdparty/openssl/crypto/modes/ctr128.c b/thirdparty/openssl/crypto/modes/ctr128.c deleted file mode 100644 index d4b22728e6..0000000000 --- a/thirdparty/openssl/crypto/modes/ctr128.c +++ /dev/null @@ -1,263 +0,0 @@ -/* ==================================================================== - * 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 <openssl/crypto.h> -#include "modes_lcl.h" -#include <string.h> - -#ifndef MODES_DEBUG -# ifndef NDEBUG -# define NDEBUG -# endif -#endif -#include <assert.h> - -/* - * NOTE: the IV/counter CTR mode is big-endian. The code itself is - * endian-neutral. - */ - -/* increment counter (128-bit int) by 1 */ -static void ctr128_inc(unsigned char *counter) -{ - u32 n = 16, c = 1; - - do { - --n; - c += counter[n]; - counter[n] = (u8)c; - c >>= 8; - } while (n); -} - -#if !defined(OPENSSL_SMALL_FOOTPRINT) -static void ctr128_inc_aligned(unsigned char *counter) -{ - size_t *data, c, d, n; - const union { - long one; - char little; - } is_endian = { - 1 - }; - - if (is_endian.little || ((size_t)counter % sizeof(size_t)) != 0) { - ctr128_inc(counter); - return; - } - - data = (size_t *)counter; - c = 1; - n = 16 / sizeof(size_t); - do { - --n; - d = data[n] += c; - /* did addition carry? */ - c = ((d - c) & ~d) >> (sizeof(size_t) * 8 - 1); - } while (n); -} -#endif - -/* - * The input encrypted as though 128bit counter mode is being used. The - * extra state information to record how much of the 128bit block we have - * used is contained in *num, and the encrypted counter is kept in - * ecount_buf. Both *num and ecount_buf must be initialised with zeros - * before the first call to CRYPTO_ctr128_encrypt(). This algorithm assumes - * that the counter is in the x lower bits of the IV (ivec), and that the - * application has full control over overflow and the rest of the IV. This - * implementation takes NO responsability for checking that the counter - * doesn't overflow into the rest of the IV when incremented. - */ -void CRYPTO_ctr128_encrypt(const unsigned char *in, unsigned char *out, - size_t len, const void *key, - unsigned char ivec[16], - unsigned char ecount_buf[16], unsigned int *num, - block128_f block) -{ - unsigned int n; - size_t l = 0; - - assert(in && out && key && ecount_buf && num); - assert(*num < 16); - - n = *num; - -#if !defined(OPENSSL_SMALL_FOOTPRINT) - if (16 % sizeof(size_t) == 0) { /* always true actually */ - do { - while (n && len) { - *(out++) = *(in++) ^ ecount_buf[n]; - --len; - n = (n + 1) % 16; - } - -# if defined(STRICT_ALIGNMENT) - if (((size_t)in | (size_t)out | (size_t)ecount_buf) - % sizeof(size_t) != 0) - break; -# endif - while (len >= 16) { - (*block) (ivec, ecount_buf, key); - ctr128_inc_aligned(ivec); - for (n = 0; n < 16; n += sizeof(size_t)) - *(size_t *)(out + n) = - *(size_t *)(in + n) ^ *(size_t *)(ecount_buf + n); - len -= 16; - out += 16; - in += 16; - n = 0; - } - if (len) { - (*block) (ivec, ecount_buf, key); - ctr128_inc_aligned(ivec); - while (len--) { - out[n] = in[n] ^ ecount_buf[n]; - ++n; - } - } - *num = n; - return; - } while (0); - } - /* the rest would be commonly eliminated by x86* compiler */ -#endif - while (l < len) { - if (n == 0) { - (*block) (ivec, ecount_buf, key); - ctr128_inc(ivec); - } - out[l] = in[l] ^ ecount_buf[n]; - ++l; - n = (n + 1) % 16; - } - - *num = n; -} - -/* increment upper 96 bits of 128-bit counter by 1 */ -static void ctr96_inc(unsigned char *counter) -{ - u32 n = 12, c = 1; - - do { - --n; - c += counter[n]; - counter[n] = (u8)c; - c >>= 8; - } while (n); -} - -void CRYPTO_ctr128_encrypt_ctr32(const unsigned char *in, unsigned char *out, - size_t len, const void *key, - unsigned char ivec[16], - unsigned char ecount_buf[16], - unsigned int *num, ctr128_f func) -{ - unsigned int n, ctr32; - - assert(in && out && key && ecount_buf && num); - assert(*num < 16); - - n = *num; - - while (n && len) { - *(out++) = *(in++) ^ ecount_buf[n]; - --len; - n = (n + 1) % 16; - } - - ctr32 = GETU32(ivec + 12); - while (len >= 16) { - size_t blocks = len / 16; - /* - * 1<<28 is just a not-so-small yet not-so-large number... - * Below condition is practically never met, but it has to - * be checked for code correctness. - */ - if (sizeof(size_t) > sizeof(unsigned int) && blocks > (1U << 28)) - blocks = (1U << 28); - /* - * As (*func) operates on 32-bit counter, caller - * has to handle overflow. 'if' below detects the - * overflow, which is then handled by limiting the - * amount of blocks to the exact overflow point... - */ - ctr32 += (u32)blocks; - if (ctr32 < blocks) { - blocks -= ctr32; - ctr32 = 0; - } - (*func) (in, out, blocks, key, ivec); - /* (*ctr) does not update ivec, caller does: */ - PUTU32(ivec + 12, ctr32); - /* ... overflow was detected, propogate carry. */ - if (ctr32 == 0) - ctr96_inc(ivec); - blocks *= 16; - len -= blocks; - out += blocks; - in += blocks; - } - if (len) { - memset(ecount_buf, 0, 16); - (*func) (ecount_buf, ecount_buf, 1, key, ivec); - ++ctr32; - PUTU32(ivec + 12, ctr32); - if (ctr32 == 0) - ctr96_inc(ivec); - while (len--) { - out[n] = in[n] ^ ecount_buf[n]; - ++n; - } - } - - *num = n; -} |