From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001 From: Wojtek Kosior Date: Fri, 30 Apr 2021 00:33:56 +0200 Subject: initial/final commit --- openssl-1.1.0h/crypto/modes/cfb128.c | 198 +++++++++++++++++++++++++++++++++++ 1 file changed, 198 insertions(+) create mode 100644 openssl-1.1.0h/crypto/modes/cfb128.c (limited to 'openssl-1.1.0h/crypto/modes/cfb128.c') diff --git a/openssl-1.1.0h/crypto/modes/cfb128.c b/openssl-1.1.0h/crypto/modes/cfb128.c new file mode 100644 index 0000000..e439567 --- /dev/null +++ b/openssl-1.1.0h/crypto/modes/cfb128.c @@ -0,0 +1,198 @@ +/* + * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include +#include "modes_lcl.h" +#include + +/* + * The input and output encrypted as though 128bit cfb mode is being used. + * The extra state information to record how much of the 128bit block we have + * used is contained in *num; + */ +void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[16], int *num, + int enc, block128_f block) +{ + unsigned int n; + size_t l = 0; + + n = *num; + + if (enc) { +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (16 % sizeof(size_t) == 0) { /* always true actually */ + do { + while (n && len) { + *(out++) = ivec[n] ^= *(in++); + --len; + n = (n + 1) % 16; + } +# if defined(STRICT_ALIGNMENT) + if (((size_t)in | (size_t)out | (size_t)ivec) % + sizeof(size_t) != 0) + break; +# endif + while (len >= 16) { + (*block) (ivec, ivec, key); + for (; n < 16; n += sizeof(size_t)) { + *(size_t *)(out + n) = + *(size_t *)(ivec + n) ^= *(size_t *)(in + n); + } + len -= 16; + out += 16; + in += 16; + n = 0; + } + if (len) { + (*block) (ivec, ivec, key); + while (len--) { + out[n] = ivec[n] ^= in[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, ivec, key); + } + out[l] = ivec[n] ^= in[l]; + ++l; + n = (n + 1) % 16; + } + *num = n; + } else { +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (16 % sizeof(size_t) == 0) { /* always true actually */ + do { + while (n && len) { + unsigned char c; + *(out++) = ivec[n] ^ (c = *(in++)); + ivec[n] = c; + --len; + n = (n + 1) % 16; + } +# if defined(STRICT_ALIGNMENT) + if (((size_t)in | (size_t)out | (size_t)ivec) % + sizeof(size_t) != 0) + break; +# endif + while (len >= 16) { + (*block) (ivec, ivec, key); + for (; n < 16; n += sizeof(size_t)) { + size_t t = *(size_t *)(in + n); + *(size_t *)(out + n) = *(size_t *)(ivec + n) ^ t; + *(size_t *)(ivec + n) = t; + } + len -= 16; + out += 16; + in += 16; + n = 0; + } + if (len) { + (*block) (ivec, ivec, key); + while (len--) { + unsigned char c; + out[n] = ivec[n] ^ (c = in[n]); + ivec[n] = c; + ++n; + } + } + *num = n; + return; + } while (0); + } + /* the rest would be commonly eliminated by x86* compiler */ +#endif + while (l < len) { + unsigned char c; + if (n == 0) { + (*block) (ivec, ivec, key); + } + out[l] = ivec[n] ^ (c = in[l]); + ivec[n] = c; + ++l; + n = (n + 1) % 16; + } + *num = n; + } +} + +/* + * This expects a single block of size nbits for both in and out. Note that + * it corrupts any extra bits in the last byte of out + */ +static void cfbr_encrypt_block(const unsigned char *in, unsigned char *out, + int nbits, const void *key, + unsigned char ivec[16], int enc, + block128_f block) +{ + int n, rem, num; + unsigned char ovec[16 * 2 + 1]; /* +1 because we dereference (but don't + * use) one byte off the end */ + + if (nbits <= 0 || nbits > 128) + return; + + /* fill in the first half of the new IV with the current IV */ + memcpy(ovec, ivec, 16); + /* construct the new IV */ + (*block) (ivec, ivec, key); + num = (nbits + 7) / 8; + if (enc) /* encrypt the input */ + for (n = 0; n < num; ++n) + out[n] = (ovec[16 + n] = in[n] ^ ivec[n]); + else /* decrypt the input */ + for (n = 0; n < num; ++n) + out[n] = (ovec[16 + n] = in[n]) ^ ivec[n]; + /* shift ovec left... */ + rem = nbits % 8; + num = nbits / 8; + if (rem == 0) + memcpy(ivec, ovec + num, 16); + else + for (n = 0; n < 16; ++n) + ivec[n] = ovec[n + num] << rem | ovec[n + num + 1] >> (8 - rem); + + /* it is not necessary to cleanse ovec, since the IV is not secret */ +} + +/* N.B. This expects the input to be packed, MS bit first */ +void CRYPTO_cfb128_1_encrypt(const unsigned char *in, unsigned char *out, + size_t bits, const void *key, + unsigned char ivec[16], int *num, + int enc, block128_f block) +{ + size_t n; + unsigned char c[1], d[1]; + + for (n = 0; n < bits; ++n) { + c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0; + cfbr_encrypt_block(c, d, 1, key, ivec, enc, block); + out[n / 8] = (out[n / 8] & ~(1 << (unsigned int)(7 - n % 8))) | + ((d[0] & 0x80) >> (unsigned int)(n % 8)); + } +} + +void CRYPTO_cfb128_8_encrypt(const unsigned char *in, unsigned char *out, + size_t length, const void *key, + unsigned char ivec[16], int *num, + int enc, block128_f block) +{ + size_t n; + + for (n = 0; n < length; ++n) + cfbr_encrypt_block(&in[n], &out[n], 8, key, ivec, enc, block); +} -- cgit v1.2.3