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-rw-r--r--src/libcryptobox/base64/avx2.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/src/libcryptobox/base64/avx2.c b/src/libcryptobox/base64/avx2.c
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+++ b/src/libcryptobox/base64/avx2.c
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+/*-
+ * Copyright 2018 Vsevolod Stakhov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*-
+Copyright (c) 2013-2015, Alfred Klomp
+Copyright (c) 2018, Vsevolod Stakhov
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+- Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+
+- 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.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS 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 COPYRIGHT
+HOLDER OR 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 "config.h"
+#include "cryptobox.h"
+
+extern const uint8_t base64_table_dec[256];
+
+#ifdef RSPAMD_HAS_TARGET_ATTR
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC push_options
+#pragma GCC target("avx2")
+#endif
+#ifndef __SSE2__
+#define __SSE2__
+#endif
+#ifndef __SSE__
+#define __SSE__
+#endif
+#ifndef __SSE4_2__
+#define __SSE4_2__
+#endif
+#ifndef __SSE4_1__
+#define __SSE4_1__
+#endif
+#ifndef __SSEE3__
+#define __SSEE3__
+#endif
+#ifndef __AVX__
+#define __AVX__
+#endif
+#ifndef __AVX2__
+#define __AVX2__
+#endif
+
+#include <immintrin.h>
+
+#define CMPGT(s, n) _mm256_cmpgt_epi8((s), _mm256_set1_epi8(n))
+#define CMPEQ(s, n) _mm256_cmpeq_epi8((s), _mm256_set1_epi8(n))
+#define REPLACE(s, n) _mm256_and_si256((s), _mm256_set1_epi8(n))
+#define RANGE(s, a, b) _mm256_andnot_si256(CMPGT((s), (b)), CMPGT((s), (a) -1))
+
+static inline __m256i
+dec_reshuffle(__m256i in) __attribute__((__target__("avx2")));
+
+static inline __m256i
+dec_reshuffle(__m256i in)
+{
+ // in, lower lane, bits, upper case are most significant bits, lower case are least significant bits:
+ // 00llllll 00kkkkLL 00jjKKKK 00JJJJJJ
+ // 00iiiiii 00hhhhII 00ggHHHH 00GGGGGG
+ // 00ffffff 00eeeeFF 00ddEEEE 00DDDDDD
+ // 00cccccc 00bbbbCC 00aaBBBB 00AAAAAA
+
+ const __m256i merge_ab_and_bc = _mm256_maddubs_epi16(in, _mm256_set1_epi32(0x01400140));
+ // 0000kkkk LLllllll 0000JJJJ JJjjKKKK
+ // 0000hhhh IIiiiiii 0000GGGG GGggHHHH
+ // 0000eeee FFffffff 0000DDDD DDddEEEE
+ // 0000bbbb CCcccccc 0000AAAA AAaaBBBB
+
+ __m256i out = _mm256_madd_epi16(merge_ab_and_bc, _mm256_set1_epi32(0x00011000));
+ // 00000000 JJJJJJjj KKKKkkkk LLllllll
+ // 00000000 GGGGGGgg HHHHhhhh IIiiiiii
+ // 00000000 DDDDDDdd EEEEeeee FFffffff
+ // 00000000 AAAAAAaa BBBBbbbb CCcccccc
+
+ // Pack bytes together in each lane:
+ out = _mm256_shuffle_epi8(out, _mm256_setr_epi8(
+ 2, 1, 0, 6, 5, 4, 10, 9, 8, 14, 13, 12, -1, -1, -1, -1,
+ 2, 1, 0, 6, 5, 4, 10, 9, 8, 14, 13, 12, -1, -1, -1, -1));
+ // 00000000 00000000 00000000 00000000
+ // LLllllll KKKKkkkk JJJJJJjj IIiiiiii
+ // HHHHhhhh GGGGGGgg FFffffff EEEEeeee
+ // DDDDDDdd CCcccccc BBBBbbbb AAAAAAaa
+
+ // Pack lanes
+ return _mm256_permutevar8x32_epi32(out, _mm256_setr_epi32(0, 1, 2, 4, 5, 6, -1, -1));
+}
+
+
+#define INNER_LOOP_AVX2 \
+ while (inlen >= 45) { \
+ __m256i str = _mm256_loadu_si256((__m256i *) c); \
+ const __m256i lut_lo = _mm256_setr_epi8( \
+ 0x15, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, \
+ 0x11, 0x11, 0x13, 0x1A, 0x1B, 0x1B, 0x1B, 0x1A, \
+ 0x15, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, \
+ 0x11, 0x11, 0x13, 0x1A, 0x1B, 0x1B, 0x1B, 0x1A); \
+ const __m256i lut_hi = _mm256_setr_epi8( \
+ 0x10, 0x10, 0x01, 0x02, 0x04, 0x08, 0x04, 0x08, \
+ 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, \
+ 0x10, 0x10, 0x01, 0x02, 0x04, 0x08, 0x04, 0x08, \
+ 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10); \
+ const __m256i lut_roll = _mm256_setr_epi8( \
+ 0, 16, 19, 4, -65, -65, -71, -71, \
+ 0, 0, 0, 0, 0, 0, 0, 0, \
+ 0, 16, 19, 4, -65, -65, -71, -71, \
+ 0, 0, 0, 0, 0, 0, 0, 0); \
+ const __m256i mask_2F = _mm256_set1_epi8(0x2f); \
+ const __m256i hi_nibbles = _mm256_and_si256(_mm256_srli_epi32(str, 4), mask_2F); \
+ const __m256i lo_nibbles = _mm256_and_si256(str, mask_2F); \
+ const __m256i hi = _mm256_shuffle_epi8(lut_hi, hi_nibbles); \
+ const __m256i lo = _mm256_shuffle_epi8(lut_lo, lo_nibbles); \
+ const __m256i eq_2F = _mm256_cmpeq_epi8(str, mask_2F); \
+ const __m256i roll = _mm256_shuffle_epi8(lut_roll, _mm256_add_epi8(eq_2F, hi_nibbles)); \
+ if (!_mm256_testz_si256(lo, hi)) { \
+ seen_error = true; \
+ break; \
+ } \
+ str = _mm256_add_epi8(str, roll); \
+ str = dec_reshuffle(str); \
+ _mm256_storeu_si256((__m256i *) o, str); \
+ c += 32; \
+ o += 24; \
+ outl += 24; \
+ inlen -= 32; \
+ }
+
+int base64_decode_avx2(const char *in, size_t inlen,
+ unsigned char *out, size_t *outlen) __attribute__((__target__("avx2")));
+int base64_decode_avx2(const char *in, size_t inlen,
+ unsigned char *out, size_t *outlen)
+{
+ ssize_t ret = 0;
+ const uint8_t *c = (const uint8_t *) in;
+ uint8_t *o = (uint8_t *) out;
+ uint8_t q, carry;
+ size_t outl = 0;
+ size_t leftover = 0;
+ bool seen_error = false;
+
+repeat:
+ switch (leftover) {
+ for (;;) {
+ case 0:
+ if (G_LIKELY(!seen_error)) {
+ INNER_LOOP_AVX2
+ }
+
+ if (inlen-- == 0) {
+ ret = 1;
+ break;
+ }
+ if ((q = base64_table_dec[*c++]) >= 254) {
+ ret = 0;
+ break;
+ }
+ carry = q << 2;
+ leftover++;
+
+ case 1:
+ if (inlen-- == 0) {
+ ret = 1;
+ break;
+ }
+ if ((q = base64_table_dec[*c++]) >= 254) {
+ ret = 0;
+ break;
+ }
+ *o++ = carry | (q >> 4);
+ carry = q << 4;
+ leftover++;
+ outl++;
+
+ case 2:
+ if (inlen-- == 0) {
+ ret = 1;
+ break;
+ }
+ if ((q = base64_table_dec[*c++]) >= 254) {
+ leftover++;
+
+ if (q == 254) {
+ if (inlen-- != 0) {
+ leftover = 0;
+ q = base64_table_dec[*c++];
+ ret = ((q == 254) && (inlen == 0)) ? 1 : 0;
+ break;
+ }
+ else {
+ ret = 1;
+ break;
+ }
+ }
+ else {
+ leftover--;
+ }
+ /* If we get here, there was an error: */
+ break;
+ }
+ *o++ = carry | (q >> 2);
+ carry = q << 6;
+ leftover++;
+ outl++;
+
+ case 3:
+ if (inlen-- == 0) {
+ ret = 1;
+ break;
+ }
+ if ((q = base64_table_dec[*c++]) >= 254) {
+ /*
+ * When q == 254, the input char is '='. Return 1 and EOF.
+ * When q == 255, the input char is invalid. Return 0 and EOF.
+ */
+ if (q == 254 && inlen == 0) {
+ ret = 1;
+ leftover = 0;
+ }
+ else {
+ ret = 0;
+ }
+
+ break;
+ }
+
+ *o++ = carry | q;
+ carry = 0;
+ leftover = 0;
+ outl++;
+ }
+ }
+
+ if (!ret && inlen > 0) {
+ /* Skip to the next valid character in input */
+ while (inlen > 0 && base64_table_dec[*c] >= 254) {
+ c++;
+ inlen--;
+ }
+
+ if (inlen > 0) {
+ seen_error = false;
+ goto repeat;
+ }
+ }
+
+ *outlen = outl;
+
+ return ret;
+}
+
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC pop_options
+#endif
+#endif
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