aes_x86ni_ctrcbc.c

/*
 * Copyright (c) 2017 Thomas Pornin <[email protected]>
 *
 * Permission is hereby granted, free of charge, to any person obtaining 
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be 
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#define BR_ENABLE_INTRINSICS   1
#include "inner.h"

#if BR_AES_X86NI

/* see bearssl_block.h */
const br_block_ctrcbc_class *
br_aes_x86ni_ctrcbc_get_vtable(void)
{
	return br_aes_x86ni_supported() ? &br_aes_x86ni_ctrcbc_vtable : NULL;
}

/* see bearssl_block.h */
void
br_aes_x86ni_ctrcbc_init(br_aes_x86ni_ctrcbc_keys *ctx,
	const void *key, size_t len)
{
	ctx->vtable = &br_aes_x86ni_ctrcbc_vtable;
	ctx->num_rounds = br_aes_x86ni_keysched_enc(ctx->skey.skni, key, len);
}

BR_TARGETS_X86_UP

/* see bearssl_block.h */
BR_TARGET("sse2,sse4.1,aes")
void
br_aes_x86ni_ctrcbc_ctr(const br_aes_x86ni_ctrcbc_keys *ctx,
	void *ctr, void *data, size_t len)
{
	unsigned char *buf;
	unsigned num_rounds;
	__m128i sk[15];
	__m128i ivx0, ivx1, ivx2, ivx3;
	__m128i erev, zero, one, four, notthree;
	unsigned u;

	buf = data;
	num_rounds = ctx->num_rounds;
	for (u = 0; u <= num_rounds; u ++) {
		sk[u] = _mm_loadu_si128((void *)(ctx->skey.skni + (u << 4)));
	}

	/*
	 * Some SSE2 constants.
	 */
	erev = _mm_set_epi8(0, 1, 2, 3, 4, 5, 6, 7,
		8, 9, 10, 11, 12, 13, 14, 15);
	zero = _mm_setzero_si128();
	one = _mm_set_epi64x(0, 1);
	four = _mm_set_epi64x(0, 4);
	notthree = _mm_sub_epi64(zero, four);

	/*
	 * Decode the counter in big-endian and pre-increment the other
	 * three counters.
	 */
	ivx0 = _mm_shuffle_epi8(_mm_loadu_si128((void *)ctr), erev);
	ivx1 = _mm_add_epi64(ivx0, one);
	ivx1 = _mm_sub_epi64(ivx1,
		_mm_slli_si128(_mm_cmpeq_epi64(ivx1, zero), 8));
	ivx2 = _mm_add_epi64(ivx1, one);
	ivx2 = _mm_sub_epi64(ivx2,
		_mm_slli_si128(_mm_cmpeq_epi64(ivx2, zero), 8));
	ivx3 = _mm_add_epi64(ivx2, one);
	ivx3 = _mm_sub_epi64(ivx3,
		_mm_slli_si128(_mm_cmpeq_epi64(ivx3, zero), 8));
	while (len > 0) {
		__m128i x0, x1, x2, x3;

		/*
		 * Load counter values; we need to byteswap them because
		 * the specification says that they use big-endian.
		 */
		x0 = _mm_shuffle_epi8(ivx0, erev);
		x1 = _mm_shuffle_epi8(ivx1, erev);
		x2 = _mm_shuffle_epi8(ivx2, erev);
		x3 = _mm_shuffle_epi8(ivx3, erev);

		x0 = _mm_xor_si128(x0, sk[0]);
		x1 = _mm_xor_si128(x1, sk[0]);
		x2 = _mm_xor_si128(x2, sk[0]);
		x3 = _mm_xor_si128(x3, sk[0]);
		x0 = _mm_aesenc_si128(x0, sk[1]);
		x1 = _mm_aesenc_si128(x1, sk[1]);
		x2 = _mm_aesenc_si128(x2, sk[1]);
		x3 = _mm_aesenc_si128(x3, sk[1]);
		x0 = _mm_aesenc_si128(x0, sk[2]);
		x1 = _mm_aesenc_si128(x1, sk[2]);
		x2 = _mm_aesenc_si128(x2, sk[2]);
		x3 = _mm_aesenc_si128(x3, sk[2]);
		x0 = _mm_aesenc_si128(x0, sk[3]);
		x1 = _mm_aesenc_si128(x1, sk[3]);
		x2 = _mm_aesenc_si128(x2, sk[3]);
		x3 = _mm_aesenc_si128(x3, sk[3]);
		x0 = _mm_aesenc_si128(x0, sk[4]);
		x1 = _mm_aesenc_si128(x1, sk[4]);
		x2 = _mm_aesenc_si128(x2, sk[4]);
		x3 = _mm_aesenc_si128(x3, sk[4]);
		x0 = _mm_aesenc_si128(x0, sk[5]);
		x1 = _mm_aesenc_si128(x1, sk[5]);
		x2 = _mm_aesenc_si128(x2, sk[5]);
		x3 = _mm_aesenc_si128(x3, sk[5]);
		x0 = _mm_aesenc_si128(x0, sk[6]);
		x1 = _mm_aesenc_si128(x1, sk[6]);
		x2 = _mm_aesenc_si128(x2, sk[6]);
		x3 = _mm_aesenc_si128(x3, sk[6]);
		x0 = _mm_aesenc_si128(x0, sk[7]);
		x1 = _mm_aesenc_si128(x1, sk[7]);
		x2 = _mm_aesenc_si128(x2, sk[7]);
		x3 = _mm_aesenc_si128(x3, sk[7]);
		x0 = _mm_aesenc_si128(x0, sk[8]);
		x1 = _mm_aesenc_si128(x1, sk[8]);
		x2 = _mm_aesenc_si128(x2, sk[8]);
		x3 = _mm_aesenc_si128(x3, sk[8]);
		x0 = _mm_aesenc_si128(x0, sk[9]);
		x1 = _mm_aesenc_si128(x1, sk[9]);
		x2 = _mm_aesenc_si128(x2, sk[9]);
		x3 = _mm_aesenc_si128(x3, sk[9]);
		if (num_rounds == 10) {
			x0 = _mm_aesenclast_si128(x0, sk[10]);
			x1 = _mm_aesenclast_si128(x1, sk[10]);
			x2 = _mm_aesenclast_si128(x2, sk[10]);
			x3 = _mm_aesenclast_si128(x3, sk[10]);
		} else if (num_rounds == 12) {
			x0 = _mm_aesenc_si128(x0, sk[10]);
			x1 = _mm_aesenc_si128(x1, sk[10]);
			x2 = _mm_aesenc_si128(x2, sk[10]);
			x3 = _mm_aesenc_si128(x3, sk[10]);
			x0 = _mm_aesenc_si128(x0, sk[11]);
			x1 = _mm_aesenc_si128(x1, sk[11]);
			x2 = _mm_aesenc_si128(x2, sk[11]);
			x3 = _mm_aesenc_si128(x3, sk[11]);
			x0 = _mm_aesenclast_si128(x0, sk[12]);
			x1 = _mm_aesenclast_si128(x1, sk[12]);
			x2 = _mm_aesenclast_si128(x2, sk[12]);
			x3 = _mm_aesenclast_si128(x3, sk[12]);
		} else {
			x0 = _mm_aesenc_si128(x0, sk[10]);
			x1 = _mm_aesenc_si128(x1, sk[10]);
			x2 = _mm_aesenc_si128(x2, sk[10]);
			x3 = _mm_aesenc_si128(x3, sk[10]);
			x0 = _mm_aesenc_si128(x0, sk[11]);
			x1 = _mm_aesenc_si128(x1, sk[11]);
			x2 = _mm_aesenc_si128(x2, sk[11]);
			x3 = _mm_aesenc_si128(x3, sk[11]);
			x0 = _mm_aesenc_si128(x0, sk[12]);
			x1 = _mm_aesenc_si128(x1, sk[12]);
			x2 = _mm_aesenc_si128(x2, sk[12]);
			x3 = _mm_aesenc_si128(x3, sk[12]);
			x0 = _mm_aesenc_si128(x0, sk[13]);
			x1 = _mm_aesenc_si128(x1, sk[13]);
			x2 = _mm_aesenc_si128(x2, sk[13]);
			x3 = _mm_aesenc_si128(x3, sk[13]);
			x0 = _mm_aesenclast_si128(x0, sk[14]);
			x1 = _mm_aesenclast_si128(x1, sk[14]);
			x2 = _mm_aesenclast_si128(x2, sk[14]);
			x3 = _mm_aesenclast_si128(x3, sk[14]);
		}
		if (len >= 64) {
			x0 = _mm_xor_si128(x0,
				_mm_loadu_si128((void *)(buf +  0)));
			x1 = _mm_xor_si128(x1,
				_mm_loadu_si128((void *)(buf + 16)));
			x2 = _mm_xor_si128(x2,
				_mm_loadu_si128((void *)(buf + 32)));
			x3 = _mm_xor_si128(x3,
				_mm_loadu_si128((void *)(buf + 48)));
			_mm_storeu_si128((void *)(buf +  0), x0);
			_mm_storeu_si128((void *)(buf + 16), x1);
			_mm_storeu_si128((void *)(buf + 32), x2);
			_mm_storeu_si128((void *)(buf + 48), x3);
			buf += 64;
			len -= 64;
		} else {
			unsigned char tmp[64];

			_mm_storeu_si128((void *)(tmp +  0), x0);
			_mm_storeu_si128((void *)(tmp + 16), x1);
			_mm_storeu_si128((void *)(tmp + 32), x2);
			_mm_storeu_si128((void *)(tmp + 48), x3);
			for (u = 0; u < len; u ++) {
				buf[u] ^= tmp[u];
			}
			switch (len) {
			case 16:
				ivx0 = ivx1;
				break;
			case 32:
				ivx0 = ivx2;
				break;
			case 48:
				ivx0 = ivx3;
				break;
			}
			break;
		}

		/*
		 * Add 4 to each counter value. For carry propagation
		 * into the upper 64-bit words, we would need to compare
		 * the results with 4, but SSE2+ has only _signed_
		 * comparisons. Instead, we mask out the low two bits,
		 * and check whether the remaining bits are zero.
		 */
		ivx0 = _mm_add_epi64(ivx0, four);
		ivx1 = _mm_add_epi64(ivx1, four);
		ivx2 = _mm_add_epi64(ivx2, four);
		ivx3 = _mm_add_epi64(ivx3, four);
		ivx0 = _mm_sub_epi64(ivx0,
			_mm_slli_si128(_mm_cmpeq_epi64(
				_mm_and_si128(ivx0, notthree), zero), 8));
		ivx1 = _mm_sub_epi64(ivx1,
			_mm_slli_si128(_mm_cmpeq_epi64(
				_mm_and_si128(ivx1, notthree), zero), 8));
		ivx2 = _mm_sub_epi64(ivx2,
			_mm_slli_si128(_mm_cmpeq_epi64(
				_mm_and_si128(ivx2, notthree), zero), 8));
		ivx3 = _mm_sub_epi64(ivx3,
			_mm_slli_si128(_mm_cmpeq_epi64(
				_mm_and_si128(ivx3, notthree), zero), 8));
	}

	/*
	 * Write back new counter value. The loop took care to put the
	 * right counter value in ivx0.
	 */
	_mm_storeu_si128((void *)ctr, _mm_shuffle_epi8(ivx0, erev));
}

/* see bearssl_block.h */
BR_TARGET("sse2,sse4.1,aes")
void
br_aes_x86ni_ctrcbc_mac(const br_aes_x86ni_ctrcbc_keys *ctx,
	void *cbcmac, const void *data, size_t len)
{
	const unsigned char *buf;
	unsigned num_rounds;
	__m128i sk[15], ivx;
	unsigned u;

	buf = data;
	ivx = _mm_loadu_si128(cbcmac);
	num_rounds = ctx->num_rounds;
	for (u = 0; u <= num_rounds; u ++) {
		sk[u] = _mm_loadu_si128((void *)(ctx->skey.skni + (u << 4)));
	}
	while (len > 0) {
		__m128i x;

		x = _mm_xor_si128(_mm_loadu_si128((void *)buf), ivx);
		x = _mm_xor_si128(x, sk[0]);
		x = _mm_aesenc_si128(x, sk[1]);
		x = _mm_aesenc_si128(x, sk[2]);
		x = _mm_aesenc_si128(x, sk[3]);
		x = _mm_aesenc_si128(x, sk[4]);
		x = _mm_aesenc_si128(x, sk[5]);
		x = _mm_aesenc_si128(x, sk[6]);
		x = _mm_aesenc_si128(x, sk[7]);
		x = _mm_aesenc_si128(x, sk[8]);
		x = _mm_aesenc_si128(x, sk[9]);
		if (num_rounds == 10) {
			x = _mm_aesenclast_si128(x, sk[10]);
		} else if (num_rounds == 12) {
			x = _mm_aesenc_si128(x, sk[10]);
			x = _mm_aesenc_si128(x, sk[11]);
			x = _mm_aesenclast_si128(x, sk[12]);
		} else {
			x = _mm_aesenc_si128(x, sk[10]);
			x = _mm_aesenc_si128(x, sk[11]);
			x = _mm_aesenc_si128(x, sk[12]);
			x = _mm_aesenc_si128(x, sk[13]);
			x = _mm_aesenclast_si128(x, sk[14]);
		}
		ivx = x;
		buf += 16;
		len -= 16;
	}
	_mm_storeu_si128(cbcmac, ivx);
}

/* see bearssl_block.h */
BR_TARGET("sse2,sse4.1,aes")
void
br_aes_x86ni_ctrcbc_encrypt(const br_aes_x86ni_ctrcbc_keys *ctx,
	void *ctr, void *cbcmac, void *data, size_t len)
{
	unsigned char *buf;
	unsigned num_rounds;
	__m128i sk[15];
	__m128i ivx, cmx;
	__m128i erev, zero, one;
	unsigned u;
	int first_iter;

	num_rounds = ctx->num_rounds;
	for (u = 0; u <= num_rounds; u ++) {
		sk[u] = _mm_loadu_si128((void *)(ctx->skey.skni + (u << 4)));
	}

	/*
	 * Some SSE2 constants.
	 */
	erev = _mm_set_epi8(0, 1, 2, 3, 4, 5, 6, 7,
		8, 9, 10, 11, 12, 13, 14, 15);
	zero = _mm_setzero_si128();
	one = _mm_set_epi64x(0, 1);

	/*
	 * Decode the counter in big-endian.
	 */
	ivx = _mm_shuffle_epi8(_mm_loadu_si128(ctr), erev);
	cmx = _mm_loadu_si128(cbcmac);

	buf = data;
	first_iter = 1;
	while (len > 0) {
		__m128i dx, x0, x1;

		/*
		 * Load initial values:
		 *   dx   encrypted block of data
		 *   x0   counter (for CTR encryption)
		 *   x1   input for CBC-MAC
		 */
		dx = _mm_loadu_si128((void *)buf);
		x0 = _mm_shuffle_epi8(ivx, erev);
		x1 = cmx;

		x0 = _mm_xor_si128(x0, sk[0]);
		x1 = _mm_xor_si128(x1, sk[0]);
		x0 = _mm_aesenc_si128(x0, sk[1]);
		x1 = _mm_aesenc_si128(x1, sk[1]);
		x0 = _mm_aesenc_si128(x0, sk[2]);
		x1 = _mm_aesenc_si128(x1, sk[2]);
		x0 = _mm_aesenc_si128(x0, sk[3]);
		x1 = _mm_aesenc_si128(x1, sk[3]);
		x0 = _mm_aesenc_si128(x0, sk[4]);
		x1 = _mm_aesenc_si128(x1, sk[4]);
		x0 = _mm_aesenc_si128(x0, sk[5]);
		x1 = _mm_aesenc_si128(x1, sk[5]);
		x0 = _mm_aesenc_si128(x0, sk[6]);
		x1 = _mm_aesenc_si128(x1, sk[6]);
		x0 = _mm_aesenc_si128(x0, sk[7]);
		x1 = _mm_aesenc_si128(x1, sk[7]);
		x0 = _mm_aesenc_si128(x0, sk[8]);
		x1 = _mm_aesenc_si128(x1, sk[8]);
		x0 = _mm_aesenc_si128(x0, sk[9]);
		x1 = _mm_aesenc_si128(x1, sk[9]);
		if (num_rounds == 10) {
			x0 = _mm_aesenclast_si128(x0, sk[10]);
			x1 = _mm_aesenclast_si128(x1, sk[10]);
		} else if (num_rounds == 12) {
			x0 = _mm_aesenc_si128(x0, sk[10]);
			x1 = _mm_aesenc_si128(x1, sk[10]);
			x0 = _mm_aesenc_si128(x0, sk[11]);
			x1 = _mm_aesenc_si128(x1, sk[11]);
			x0 = _mm_aesenclast_si128(x0, sk[12]);
			x1 = _mm_aesenclast_si128(x1, sk[12]);
		} else {
			x0 = _mm_aesenc_si128(x0, sk[10]);
			x1 = _mm_aesenc_si128(x1, sk[10]);
			x0 = _mm_aesenc_si128(x0, sk[11]);
			x1 = _mm_aesenc_si128(x1, sk[11]);
			x0 = _mm_aesenc_si128(x0, sk[12]);
			x1 = _mm_aesenc_si128(x1, sk[12]);
			x0 = _mm_aesenc_si128(x0, sk[13]);
			x1 = _mm_aesenc_si128(x1, sk[13]);
			x0 = _mm_aesenclast_si128(x0, sk[14]);
			x1 = _mm_aesenclast_si128(x1, sk[14]);
		}

		x0 = _mm_xor_si128(x0, dx);
		if (first_iter) {
			cmx = _mm_xor_si128(cmx, x0);
			first_iter = 0;
		} else {
			cmx = _mm_xor_si128(x1, x0);
		}
		_mm_storeu_si128((void *)buf, x0);

		buf += 16;
		len -= 16;

		/*
		 * Increment the counter value.
		 */
		ivx = _mm_add_epi64(ivx, one);
		ivx = _mm_sub_epi64(ivx,
			_mm_slli_si128(_mm_cmpeq_epi64(ivx, zero), 8));

		/*
		 * If this was the last iteration, then compute the
		 * extra block encryption to complete CBC-MAC.
		 */
		if (len == 0) {
			cmx = _mm_xor_si128(cmx, sk[0]);
			cmx = _mm_aesenc_si128(cmx, sk[1]);
			cmx = _mm_aesenc_si128(cmx, sk[2]);
			cmx = _mm_aesenc_si128(cmx, sk[3]);
			cmx = _mm_aesenc_si128(cmx, sk[4]);
			cmx = _mm_aesenc_si128(cmx, sk[5]);
			cmx = _mm_aesenc_si128(cmx, sk[6]);
			cmx = _mm_aesenc_si128(cmx, sk[7]);
			cmx = _mm_aesenc_si128(cmx, sk[8]);
			cmx = _mm_aesenc_si128(cmx, sk[9]);
			if (num_rounds == 10) {
				cmx = _mm_aesenclast_si128(cmx, sk[10]);
			} else if (num_rounds == 12) {
				cmx = _mm_aesenc_si128(cmx, sk[10]);
				cmx = _mm_aesenc_si128(cmx, sk[11]);
				cmx = _mm_aesenclast_si128(cmx, sk[12]);
			} else {
				cmx = _mm_aesenc_si128(cmx, sk[10]);
				cmx = _mm_aesenc_si128(cmx, sk[11]);
				cmx = _mm_aesenc_si128(cmx, sk[12]);
				cmx = _mm_aesenc_si128(cmx, sk[13]);
				cmx = _mm_aesenclast_si128(cmx, sk[14]);
			}
			break;
		}
	}

	/*
	 * Write back new counter value and CBC-MAC value.
	 */
	_mm_storeu_si128(ctr, _mm_shuffle_epi8(ivx, erev));
	_mm_storeu_si128(cbcmac, cmx);
}

/* see bearssl_block.h */
BR_TARGET("sse2,sse4.1,aes")
void
br_aes_x86ni_ctrcbc_decrypt(const br_aes_x86ni_ctrcbc_keys *ctx,
	void *ctr, void *cbcmac, void *data, size_t len)
{
	unsigned char *buf;
	unsigned num_rounds;
	__m128i sk[15];
	__m128i ivx, cmx;
	__m128i erev, zero, one;
	unsigned u;

	num_rounds = ctx->num_rounds;
	for (u = 0; u <= num_rounds; u ++) {
		sk[u] = _mm_loadu_si128((void *)(ctx->skey.skni + (u << 4)));
	}

	/*
	 * Some SSE2 constants.
	 */
	erev = _mm_set_epi8(0, 1, 2, 3, 4, 5, 6, 7,
		8, 9, 10, 11, 12, 13, 14, 15);
	zero = _mm_setzero_si128();
	one = _mm_set_epi64x(0, 1);

	/*
	 * Decode the counter in big-endian.
	 */
	ivx = _mm_shuffle_epi8(_mm_loadu_si128(ctr), erev);
	cmx = _mm_loadu_si128(cbcmac);

	buf = data;
	while (len > 0) {
		__m128i dx, x0, x1;

		/*
		 * Load initial values:
		 *   dx   encrypted block of data
		 *   x0   counter (for CTR encryption)
		 *   x1   input for CBC-MAC
		 */
		dx = _mm_loadu_si128((void *)buf);
		x0 = _mm_shuffle_epi8(ivx, erev);
		x1 = _mm_xor_si128(cmx, dx);

		x0 = _mm_xor_si128(x0, sk[0]);
		x1 = _mm_xor_si128(x1, sk[0]);
		x0 = _mm_aesenc_si128(x0, sk[1]);
		x1 = _mm_aesenc_si128(x1, sk[1]);
		x0 = _mm_aesenc_si128(x0, sk[2]);
		x1 = _mm_aesenc_si128(x1, sk[2]);
		x0 = _mm_aesenc_si128(x0, sk[3]);
		x1 = _mm_aesenc_si128(x1, sk[3]);
		x0 = _mm_aesenc_si128(x0, sk[4]);
		x1 = _mm_aesenc_si128(x1, sk[4]);
		x0 = _mm_aesenc_si128(x0, sk[5]);
		x1 = _mm_aesenc_si128(x1, sk[5]);
		x0 = _mm_aesenc_si128(x0, sk[6]);
		x1 = _mm_aesenc_si128(x1, sk[6]);
		x0 = _mm_aesenc_si128(x0, sk[7]);
		x1 = _mm_aesenc_si128(x1, sk[7]);
		x0 = _mm_aesenc_si128(x0, sk[8]);
		x1 = _mm_aesenc_si128(x1, sk[8]);
		x0 = _mm_aesenc_si128(x0, sk[9]);
		x1 = _mm_aesenc_si128(x1, sk[9]);
		if (num_rounds == 10) {
			x0 = _mm_aesenclast_si128(x0, sk[10]);
			x1 = _mm_aesenclast_si128(x1, sk[10]);
		} else if (num_rounds == 12) {
			x0 = _mm_aesenc_si128(x0, sk[10]);
			x1 = _mm_aesenc_si128(x1, sk[10]);
			x0 = _mm_aesenc_si128(x0, sk[11]);
			x1 = _mm_aesenc_si128(x1, sk[11]);
			x0 = _mm_aesenclast_si128(x0, sk[12]);
			x1 = _mm_aesenclast_si128(x1, sk[12]);
		} else {
			x0 = _mm_aesenc_si128(x0, sk[10]);
			x1 = _mm_aesenc_si128(x1, sk[10]);
			x0 = _mm_aesenc_si128(x0, sk[11]);
			x1 = _mm_aesenc_si128(x1, sk[11]);
			x0 = _mm_aesenc_si128(x0, sk[12]);
			x1 = _mm_aesenc_si128(x1, sk[12]);
			x0 = _mm_aesenc_si128(x0, sk[13]);
			x1 = _mm_aesenc_si128(x1, sk[13]);
			x0 = _mm_aesenclast_si128(x0, sk[14]);
			x1 = _mm_aesenclast_si128(x1, sk[14]);
		}
		x0 = _mm_xor_si128(x0, dx);
		cmx = x1;
		_mm_storeu_si128((void *)buf, x0);

		buf += 16;
		len -= 16;

		/*
		 * Increment the counter value.
		 */
		ivx = _mm_add_epi64(ivx, one);
		ivx = _mm_sub_epi64(ivx,
			_mm_slli_si128(_mm_cmpeq_epi64(ivx, zero), 8));
	}

	/*
	 * Write back new counter value and CBC-MAC value.
	 */
	_mm_storeu_si128(ctr, _mm_shuffle_epi8(ivx, erev));
	_mm_storeu_si128(cbcmac, cmx);
}

BR_TARGETS_X86_DOWN

/* see bearssl_block.h */
const br_block_ctrcbc_class br_aes_x86ni_ctrcbc_vtable = {
	sizeof(br_aes_x86ni_ctrcbc_keys),
	16,
	4,
	(void (*)(const br_block_ctrcbc_class **, const void *, size_t))
		&br_aes_x86ni_ctrcbc_init,
	(void (*)(const br_block_ctrcbc_class *const *,
		void *, void *, void *, size_t))
		&br_aes_x86ni_ctrcbc_encrypt,
	(void (*)(const br_block_ctrcbc_class *const *,
		void *, void *, void *, size_t))
		&br_aes_x86ni_ctrcbc_decrypt,
	(void (*)(const br_block_ctrcbc_class *const *,
		void *, void *, size_t))
		&br_aes_x86ni_ctrcbc_ctr,
	(void (*)(const br_block_ctrcbc_class *const *,
		void *, const void *, size_t))
		&br_aes_x86ni_ctrcbc_mac
};

#else

/* see bearssl_block.h */
const br_block_ctrcbc_class *
br_aes_x86ni_ctrcbc_get_vtable(void)
{
	return NULL;
}

#endif