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Diffstat (limited to 'crypto/chacha/chacha_generic.c')
| -rw-r--r-- | crypto/chacha/chacha_generic.c | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/crypto/chacha/chacha_generic.c b/crypto/chacha/chacha_generic.c deleted file mode 100644 index f262033c..00000000 --- a/crypto/chacha/chacha_generic.c +++ /dev/null @@ -1,140 +0,0 @@ -/* Copyright (c) 2014, Google Inc. - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION - * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN - * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ - -/* Adapted from the public domain, estream code by D. Bernstein. */ - -#include <openssl/chacha.h> - -#include <string.h> - -#include <openssl/cpu.h> - - -#if defined(OPENSSL_WINDOWS) || (!defined(OPENSSL_X86_64) && !defined(OPENSSL_X86)) || !defined(__SSE2__) - -/* sigma contains the ChaCha constants, which happen to be an ASCII string. */ -static const uint8_t sigma[16] = { 'e', 'x', 'p', 'a', 'n', 'd', ' ', '3', - '2', '-', 'b', 'y', 't', 'e', ' ', 'k' }; - -#define ROTATE(v, n) (((v) << (n)) | ((v) >> (32 - (n)))) -#define XOR(v, w) ((v) ^ (w)) -#define PLUS(x, y) ((x) + (y)) -#define PLUSONE(v) (PLUS((v), 1)) - -#define U32TO8_LITTLE(p, v) \ - { \ - (p)[0] = (v >> 0) & 0xff; \ - (p)[1] = (v >> 8) & 0xff; \ - (p)[2] = (v >> 16) & 0xff; \ - (p)[3] = (v >> 24) & 0xff; \ - } - -#define U8TO32_LITTLE(p) \ - (((uint32_t)((p)[0])) | ((uint32_t)((p)[1]) << 8) | \ - ((uint32_t)((p)[2]) << 16) | ((uint32_t)((p)[3]) << 24)) - -/* QUARTERROUND updates a, b, c, d with a ChaCha "quarter" round. */ -#define QUARTERROUND(a,b,c,d) \ - x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]),16); \ - x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]),12); \ - x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]), 8); \ - x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]), 7); - -#if defined(OPENSSL_ARM) && !defined(OPENSSL_NO_ASM) -/* Defined in chacha_vec.c */ -void CRYPTO_chacha_20_neon(uint8_t *out, const uint8_t *in, size_t in_len, - const uint8_t key[32], const uint8_t nonce[12], - uint32_t counter); -#endif - -/* chacha_core performs 20 rounds of ChaCha on the input words in - * |input| and writes the 64 output bytes to |output|. */ -static void chacha_core(uint8_t output[64], const uint32_t input[16]) { - uint32_t x[16]; - int i; - - memcpy(x, input, sizeof(uint32_t) * 16); - for (i = 20; i > 0; i -= 2) { - QUARTERROUND(0, 4, 8, 12) - QUARTERROUND(1, 5, 9, 13) - QUARTERROUND(2, 6, 10, 14) - QUARTERROUND(3, 7, 11, 15) - QUARTERROUND(0, 5, 10, 15) - QUARTERROUND(1, 6, 11, 12) - QUARTERROUND(2, 7, 8, 13) - QUARTERROUND(3, 4, 9, 14) - } - - for (i = 0; i < 16; ++i) { - x[i] = PLUS(x[i], input[i]); - } - for (i = 0; i < 16; ++i) { - U32TO8_LITTLE(output + 4 * i, x[i]); - } -} - -void CRYPTO_chacha_20(uint8_t *out, const uint8_t *in, size_t in_len, - const uint8_t key[32], const uint8_t nonce[12], - uint32_t counter) { - uint32_t input[16]; - uint8_t buf[64]; - size_t todo, i; - -#if defined(OPENSSL_ARM) && !defined(OPENSSL_NO_ASM) - if (CRYPTO_is_NEON_capable()) { - CRYPTO_chacha_20_neon(out, in, in_len, key, nonce, counter); - return; - } -#endif - - input[0] = U8TO32_LITTLE(sigma + 0); - input[1] = U8TO32_LITTLE(sigma + 4); - input[2] = U8TO32_LITTLE(sigma + 8); - input[3] = U8TO32_LITTLE(sigma + 12); - - input[4] = U8TO32_LITTLE(key + 0); - input[5] = U8TO32_LITTLE(key + 4); - input[6] = U8TO32_LITTLE(key + 8); - input[7] = U8TO32_LITTLE(key + 12); - - input[8] = U8TO32_LITTLE(key + 16); - input[9] = U8TO32_LITTLE(key + 20); - input[10] = U8TO32_LITTLE(key + 24); - input[11] = U8TO32_LITTLE(key + 28); - - input[12] = counter; - input[13] = U8TO32_LITTLE(nonce + 0); - input[14] = U8TO32_LITTLE(nonce + 4); - input[15] = U8TO32_LITTLE(nonce + 8); - - while (in_len > 0) { - todo = sizeof(buf); - if (in_len < todo) { - todo = in_len; - } - - chacha_core(buf, input); - for (i = 0; i < todo; i++) { - out[i] = in[i] ^ buf[i]; - } - - out += todo; - in += todo; - in_len -= todo; - - input[12]++; - } -} - -#endif /* OPENSSL_WINDOWS || !OPENSSL_X86_64 && !OPENSSL_X86 || !__SSE2__ */ |