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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.
//
// Created by meganwoods on 3/16/23.
//
#include
#include "cfb.h"
/**
*
* @param d0 in / out
* @param d1 in / out
* @param d2 in / out
* @param d3 in / out
* @param d4 in / out
* @param d5 in / out
* @param d6 in / out
* @param d7 in / out
* @param feedback the chainblock
* @param roundKeys
* @param blocks blocks must be even number 16 to 2, 1 does odd block processing, any other value does nothing.
* @param max_rounds The maximum number of rounds.
*
* Odd block assumes that cipher text has been broadcast into both lanes of d0.
*
*/
static inline void aes256w_cfb_decrypt(
__m256i *d0, __m256i *d1, __m256i *d2, __m256i *d3,
__m256i *d4, __m256i *d5, __m256i *d6, __m256i *d7,
__m128i *feedback, __m128i *roundKeys, const uint32_t blocks,
const uint32_t max_rounds) {
__m256i tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
if (blocks == 16) {
tmp0 = _mm256_set_m128i(_mm256_extracti128_si256(*d0, 0), *feedback);
tmp1 = _mm256_set_m128i(_mm256_extracti128_si256(*d1, 0), _mm256_extracti128_si256(*d0, 1));
tmp2 = _mm256_set_m128i(_mm256_extracti128_si256(*d2, 0), _mm256_extracti128_si256(*d1, 1));
tmp3 = _mm256_set_m128i(_mm256_extracti128_si256(*d3, 0), _mm256_extracti128_si256(*d2, 1));
tmp4 = _mm256_set_m128i(_mm256_extracti128_si256(*d4, 0), _mm256_extracti128_si256(*d3, 1));
tmp5 = _mm256_set_m128i(_mm256_extracti128_si256(*d5, 0), _mm256_extracti128_si256(*d4, 1));
tmp6 = _mm256_set_m128i(_mm256_extracti128_si256(*d6, 0), _mm256_extracti128_si256(*d5, 1));
tmp7 = _mm256_set_m128i(_mm256_extracti128_si256(*d7, 0), _mm256_extracti128_si256(*d6, 1));
*feedback = _mm256_extracti128_si256(*d7, 1);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp1 = _mm256_xor_si256(tmp1, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp2 = _mm256_xor_si256(tmp2, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp3 = _mm256_xor_si256(tmp3, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp4 = _mm256_xor_si256(tmp4, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp5 = _mm256_xor_si256(tmp5, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp6 = _mm256_xor_si256(tmp6, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp7 = _mm256_xor_si256(tmp7, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenc_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenc_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenc_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp4 = _mm256_aesenc_epi128(tmp4, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp5 = _mm256_aesenc_epi128(tmp5, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp6 = _mm256_aesenc_epi128(tmp6, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp7 = _mm256_aesenc_epi128(tmp7, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenclast_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenclast_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenclast_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp4 = _mm256_aesenclast_epi128(tmp4, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp5 = _mm256_aesenclast_epi128(tmp5, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp6 = _mm256_aesenclast_epi128(tmp6, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp7 = _mm256_aesenclast_epi128(tmp7, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
*d1 = _mm256_xor_si256(*d1, tmp1);
*d2 = _mm256_xor_si256(*d2, tmp2);
*d3 = _mm256_xor_si256(*d3, tmp3);
*d4 = _mm256_xor_si256(*d4, tmp4);
*d5 = _mm256_xor_si256(*d5, tmp5);
*d6 = _mm256_xor_si256(*d6, tmp6);
*d7 = _mm256_xor_si256(*d7, tmp7);
} else if (blocks == 14) {
tmp0 = _mm256_set_m128i(_mm256_extracti128_si256(*d0, 0), *feedback);
tmp1 = _mm256_set_m128i(_mm256_extracti128_si256(*d1, 0), _mm256_extracti128_si256(*d0, 1));
tmp2 = _mm256_set_m128i(_mm256_extracti128_si256(*d2, 0), _mm256_extracti128_si256(*d1, 1));
tmp3 = _mm256_set_m128i(_mm256_extracti128_si256(*d3, 0), _mm256_extracti128_si256(*d2, 1));
tmp4 = _mm256_set_m128i(_mm256_extracti128_si256(*d4, 0), _mm256_extracti128_si256(*d3, 1));
tmp5 = _mm256_set_m128i(_mm256_extracti128_si256(*d5, 0), _mm256_extracti128_si256(*d4, 1));
tmp6 = _mm256_set_m128i(_mm256_extracti128_si256(*d6, 0), _mm256_extracti128_si256(*d5, 1));
*feedback = _mm256_extracti128_si256(*d6, 1);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp1 = _mm256_xor_si256(tmp1, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp2 = _mm256_xor_si256(tmp2, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp3 = _mm256_xor_si256(tmp3, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp4 = _mm256_xor_si256(tmp4, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp5 = _mm256_xor_si256(tmp5, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp6 = _mm256_xor_si256(tmp6, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenc_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenc_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenc_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp4 = _mm256_aesenc_epi128(tmp4, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp5 = _mm256_aesenc_epi128(tmp5, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp6 = _mm256_aesenc_epi128(tmp6, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenclast_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenclast_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenclast_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp4 = _mm256_aesenclast_epi128(tmp4, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp5 = _mm256_aesenclast_epi128(tmp5, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp6 = _mm256_aesenclast_epi128(tmp6, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
*d1 = _mm256_xor_si256(*d1, tmp1);
*d2 = _mm256_xor_si256(*d2, tmp2);
*d3 = _mm256_xor_si256(*d3, tmp3);
*d4 = _mm256_xor_si256(*d4, tmp4);
*d5 = _mm256_xor_si256(*d5, tmp5);
*d6 = _mm256_xor_si256(*d6, tmp6);
} else if (blocks == 12) {
tmp0 = _mm256_set_m128i(_mm256_extracti128_si256(*d0, 0), *feedback);
tmp1 = _mm256_set_m128i(_mm256_extracti128_si256(*d1, 0), _mm256_extracti128_si256(*d0, 1));
tmp2 = _mm256_set_m128i(_mm256_extracti128_si256(*d2, 0), _mm256_extracti128_si256(*d1, 1));
tmp3 = _mm256_set_m128i(_mm256_extracti128_si256(*d3, 0), _mm256_extracti128_si256(*d2, 1));
tmp4 = _mm256_set_m128i(_mm256_extracti128_si256(*d4, 0), _mm256_extracti128_si256(*d3, 1));
tmp5 = _mm256_set_m128i(_mm256_extracti128_si256(*d5, 0), _mm256_extracti128_si256(*d4, 1));
*feedback = _mm256_extracti128_si256(*d5, 1);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp1 = _mm256_xor_si256(tmp1, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp2 = _mm256_xor_si256(tmp2, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp3 = _mm256_xor_si256(tmp3, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp4 = _mm256_xor_si256(tmp4, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp5 = _mm256_xor_si256(tmp5, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenc_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenc_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenc_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp4 = _mm256_aesenc_epi128(tmp4, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp5 = _mm256_aesenc_epi128(tmp5, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenclast_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenclast_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenclast_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp4 = _mm256_aesenclast_epi128(tmp4, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp5 = _mm256_aesenclast_epi128(tmp5, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
*d1 = _mm256_xor_si256(*d1, tmp1);
*d2 = _mm256_xor_si256(*d2, tmp2);
*d3 = _mm256_xor_si256(*d3, tmp3);
*d4 = _mm256_xor_si256(*d4, tmp4);
*d5 = _mm256_xor_si256(*d5, tmp5);
} else if (blocks == 10) {
tmp0 = _mm256_set_m128i(_mm256_extracti128_si256(*d0, 0), *feedback);
tmp1 = _mm256_set_m128i(_mm256_extracti128_si256(*d1, 0), _mm256_extracti128_si256(*d0, 1));
tmp2 = _mm256_set_m128i(_mm256_extracti128_si256(*d2, 0), _mm256_extracti128_si256(*d1, 1));
tmp3 = _mm256_set_m128i(_mm256_extracti128_si256(*d3, 0), _mm256_extracti128_si256(*d2, 1));
tmp4 = _mm256_set_m128i(_mm256_extracti128_si256(*d4, 0), _mm256_extracti128_si256(*d3, 1));
*feedback = _mm256_extracti128_si256(*d4, 1);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp1 = _mm256_xor_si256(tmp1, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp2 = _mm256_xor_si256(tmp2, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp3 = _mm256_xor_si256(tmp3, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp4 = _mm256_xor_si256(tmp4, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenc_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenc_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenc_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp4 = _mm256_aesenc_epi128(tmp4, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenclast_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenclast_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenclast_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp4 = _mm256_aesenclast_epi128(tmp4, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
*d1 = _mm256_xor_si256(*d1, tmp1);
*d2 = _mm256_xor_si256(*d2, tmp2);
*d3 = _mm256_xor_si256(*d3, tmp3);
*d4 = _mm256_xor_si256(*d4, tmp4);
} else if (blocks == 8) {
tmp0 = _mm256_set_m128i(_mm256_extracti128_si256(*d0, 0), *feedback);
tmp1 = _mm256_set_m128i(_mm256_extracti128_si256(*d1, 0), _mm256_extracti128_si256(*d0, 1));
tmp2 = _mm256_set_m128i(_mm256_extracti128_si256(*d2, 0), _mm256_extracti128_si256(*d1, 1));
tmp3 = _mm256_set_m128i(_mm256_extracti128_si256(*d3, 0), _mm256_extracti128_si256(*d2, 1));
*feedback = _mm256_extracti128_si256(*d3, 1);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp1 = _mm256_xor_si256(tmp1, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp2 = _mm256_xor_si256(tmp2, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp3 = _mm256_xor_si256(tmp3, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenc_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenc_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenc_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenclast_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenclast_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp3 = _mm256_aesenclast_epi128(tmp3, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
*d1 = _mm256_xor_si256(*d1, tmp1);
*d2 = _mm256_xor_si256(*d2, tmp2);
*d3 = _mm256_xor_si256(*d3, tmp3);
} else if (blocks == 6) {
tmp0 = _mm256_set_m128i(_mm256_extracti128_si256(*d0, 0), *feedback);
tmp1 = _mm256_set_m128i(_mm256_extracti128_si256(*d1, 0), _mm256_extracti128_si256(*d0, 1));
tmp2 = _mm256_set_m128i(_mm256_extracti128_si256(*d2, 0), _mm256_extracti128_si256(*d1, 1));
*feedback = _mm256_extracti128_si256(*d2, 1);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp1 = _mm256_xor_si256(tmp1, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp2 = _mm256_xor_si256(tmp2, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenc_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenc_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenclast_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp2 = _mm256_aesenclast_epi128(tmp2, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
*d1 = _mm256_xor_si256(*d1, tmp1);
*d2 = _mm256_xor_si256(*d2, tmp2);
} else if (blocks == 4) {
tmp0 = _mm256_set_m128i(_mm256_extracti128_si256(*d0, 0), *feedback);
tmp1 = _mm256_set_m128i(_mm256_extracti128_si256(*d1, 0), _mm256_extracti128_si256(*d0, 1));
*feedback = _mm256_extracti128_si256(*d1, 1);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
tmp1 = _mm256_xor_si256(tmp1, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenc_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
tmp1 = _mm256_aesenclast_epi128(tmp1, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
*d1 = _mm256_xor_si256(*d1, tmp1);
} else if (blocks == 2) {
tmp0 = _mm256_set_m128i(_mm256_extracti128_si256(*d0, 0), *feedback);
*feedback = _mm256_extracti128_si256(*d0, 1);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
} else {
// The odd block assumes block as been broadcast into both lanes.
// Feedback is broadcast into both lanes.
// Result can be extracted by doing cast down to __m128i
tmp0 = _mm256_broadcastsi128_si256(*feedback);
*feedback = _mm256_castsi256_si128(*d0);
tmp0 = _mm256_xor_si256(tmp0, _mm256_broadcastsi128_si256(roundKeys[0]));
int rounds;
for (rounds = 1; rounds < max_rounds; rounds++) {
tmp0 = _mm256_aesenc_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
}
tmp0 = _mm256_aesenclast_epi128(tmp0, _mm256_broadcastsi128_si256(roundKeys[rounds]));
*d0 = _mm256_xor_si256(*d0, tmp0);
}
}
size_t cfb_decrypt(cfb_ctx *cfb, unsigned char *src, size_t len, unsigned char *dest) {
unsigned char *destStart = dest;
//
// Round out buffer.
//
while (cfb->buf_index > 0 && len > 0) {
*dest = cfb_decrypt_byte(cfb, *src);
len--;
dest++;
src++;
}
while (len >= 16 * CFB_BLOCK_SIZE) {
__m256i d0 = _mm256_loadu_si256((__m256i *) &src[0 * 32]);
__m256i d1 = _mm256_loadu_si256((__m256i *) &src[1 * 32]);
__m256i d2 = _mm256_loadu_si256((__m256i *) &src[2 * 32]);
__m256i d3 = _mm256_loadu_si256((__m256i *) &src[3 * 32]);
__m256i d4 = _mm256_loadu_si256((__m256i *) &src[4 * 32]);
__m256i d5 = _mm256_loadu_si256((__m256i *) &src[5 * 32]);
__m256i d6 = _mm256_loadu_si256((__m256i *) &src[6 * 32]);
__m256i d7 = _mm256_loadu_si256((__m256i *) &src[7 * 32]);
aes256w_cfb_decrypt(&d0, &d1, &d2, &d3, &d4, &d5, &d6, &d7, &cfb->feedback, cfb->roundKeys, 16,
cfb->num_rounds);
_mm256_storeu_si256((__m256i *) &dest[0 * 32], d0);
_mm256_storeu_si256((__m256i *) &dest[1 * 32], d1);
_mm256_storeu_si256((__m256i *) &dest[2 * 32], d2);
_mm256_storeu_si256((__m256i *) &dest[3 * 32], d3);
_mm256_storeu_si256((__m256i *) &dest[4 * 32], d4);
_mm256_storeu_si256((__m256i *) &dest[5 * 32], d5);
_mm256_storeu_si256((__m256i *) &dest[6 * 32], d6);
_mm256_storeu_si256((__m256i *) &dest[7 * 32], d7);
len -= 16 * CFB_BLOCK_SIZE;
src += 16 * CFB_BLOCK_SIZE;
dest += 16 * CFB_BLOCK_SIZE;
}
while (len >= CFB_BLOCK_SIZE) {
if (len >= 14 * CFB_BLOCK_SIZE) {
__m256i d0 = _mm256_loadu_si256((__m256i *) &src[0 * 32]);
__m256i d1 = _mm256_loadu_si256((__m256i *) &src[1 * 32]);
__m256i d2 = _mm256_loadu_si256((__m256i *) &src[2 * 32]);
__m256i d3 = _mm256_loadu_si256((__m256i *) &src[3 * 32]);
__m256i d4 = _mm256_loadu_si256((__m256i *) &src[4 * 32]);
__m256i d5 = _mm256_loadu_si256((__m256i *) &src[5 * 32]);
__m256i d6 = _mm256_loadu_si256((__m256i *) &src[6 * 32]);
aes256w_cfb_decrypt(&d0, &d1, &d2, &d3, &d4, &d5, &d6, &d6, &cfb->feedback, cfb->roundKeys, 14,
cfb->num_rounds);
_mm256_storeu_si256((__m256i *) &dest[0 * 32], d0);
_mm256_storeu_si256((__m256i *) &dest[1 * 32], d1);
_mm256_storeu_si256((__m256i *) &dest[2 * 32], d2);
_mm256_storeu_si256((__m256i *) &dest[3 * 32], d3);
_mm256_storeu_si256((__m256i *) &dest[4 * 32], d4);
_mm256_storeu_si256((__m256i *) &dest[5 * 32], d5);
_mm256_storeu_si256((__m256i *) &dest[6 * 32], d6);
len -= 14 * CFB_BLOCK_SIZE;
src += 14 * CFB_BLOCK_SIZE;
dest += 14 * CFB_BLOCK_SIZE;
} else if (len >= 12 * CFB_BLOCK_SIZE) {
__m256i d0 = _mm256_loadu_si256((__m256i *) &src[0 * 32]);
__m256i d1 = _mm256_loadu_si256((__m256i *) &src[1 * 32]);
__m256i d2 = _mm256_loadu_si256((__m256i *) &src[2 * 32]);
__m256i d3 = _mm256_loadu_si256((__m256i *) &src[3 * 32]);
__m256i d4 = _mm256_loadu_si256((__m256i *) &src[4 * 32]);
__m256i d5 = _mm256_loadu_si256((__m256i *) &src[5 * 32]);
aes256w_cfb_decrypt(&d0, &d1, &d2, &d3, &d4, &d5, &d5, &d5, &cfb->feedback, cfb->roundKeys, 12,
cfb->num_rounds);
_mm256_storeu_si256((__m256i *) &dest[0 * 32], d0);
_mm256_storeu_si256((__m256i *) &dest[1 * 32], d1);
_mm256_storeu_si256((__m256i *) &dest[2 * 32], d2);
_mm256_storeu_si256((__m256i *) &dest[3 * 32], d3);
_mm256_storeu_si256((__m256i *) &dest[4 * 32], d4);
_mm256_storeu_si256((__m256i *) &dest[5 * 32], d5);
len -= 12 * CFB_BLOCK_SIZE;
src += 12 * CFB_BLOCK_SIZE;
dest += 12 * CFB_BLOCK_SIZE;
} else if (len >= 10 * CFB_BLOCK_SIZE) {
__m256i d0 = _mm256_loadu_si256((__m256i *) &src[0 * 32]);
__m256i d1 = _mm256_loadu_si256((__m256i *) &src[1 * 32]);
__m256i d2 = _mm256_loadu_si256((__m256i *) &src[2 * 32]);
__m256i d3 = _mm256_loadu_si256((__m256i *) &src[3 * 32]);
__m256i d4 = _mm256_loadu_si256((__m256i *) &src[4 * 32]);
aes256w_cfb_decrypt(&d0, &d1, &d2, &d3, &d4, &d4, &d4, &d4, &cfb->feedback, cfb->roundKeys, 10,
cfb->num_rounds);
_mm256_storeu_si256((__m256i *) &dest[0 * 32], d0);
_mm256_storeu_si256((__m256i *) &dest[1 * 32], d1);
_mm256_storeu_si256((__m256i *) &dest[2 * 32], d2);
_mm256_storeu_si256((__m256i *) &dest[3 * 32], d3);
_mm256_storeu_si256((__m256i *) &dest[4 * 32], d4);
len -= 10 * CFB_BLOCK_SIZE;
src += 10 * CFB_BLOCK_SIZE;
dest += 10 * CFB_BLOCK_SIZE;
} else if (len >= 8 * CFB_BLOCK_SIZE) {
__m256i d0 = _mm256_loadu_si256((__m256i *) &src[0 * 32]);
__m256i d1 = _mm256_loadu_si256((__m256i *) &src[1 * 32]);
__m256i d2 = _mm256_loadu_si256((__m256i *) &src[2 * 32]);
__m256i d3 = _mm256_loadu_si256((__m256i *) &src[3 * 32]);
aes256w_cfb_decrypt(&d0, &d1, &d2, &d3, &d3, &d3, &d3, &d3, &cfb->feedback, cfb->roundKeys, 8,
cfb->num_rounds);
_mm256_storeu_si256((__m256i *) &dest[0 * 32], d0);
_mm256_storeu_si256((__m256i *) &dest[1 * 32], d1);
_mm256_storeu_si256((__m256i *) &dest[2 * 32], d2);
_mm256_storeu_si256((__m256i *) &dest[3 * 32], d3);
len -= 8 * CFB_BLOCK_SIZE;
src += 8 * CFB_BLOCK_SIZE;
dest += 8 * CFB_BLOCK_SIZE;
} else if (len >= 6 * CFB_BLOCK_SIZE) {
__m256i d0 = _mm256_loadu_si256((__m256i *) &src[0 * 32]);
__m256i d1 = _mm256_loadu_si256((__m256i *) &src[1 * 32]);
__m256i d2 = _mm256_loadu_si256((__m256i *) &src[2 * 32]);
aes256w_cfb_decrypt(&d0, &d1, &d2, &d2, &d2, &d2, &d2, &d2, &cfb->feedback, cfb->roundKeys, 6,
cfb->num_rounds);
_mm256_storeu_si256((__m256i *) &dest[0 * 32], d0);
_mm256_storeu_si256((__m256i *) &dest[1 * 32], d1);
_mm256_storeu_si256((__m256i *) &dest[2 * 32], d2);
len -= 6 * CFB_BLOCK_SIZE;
src += 6 * CFB_BLOCK_SIZE;
dest += 6 * CFB_BLOCK_SIZE;
} else if (len >= 4 * CFB_BLOCK_SIZE) {
__m256i d0 = _mm256_loadu_si256((__m256i *) &src[0 * 32]);
__m256i d1 = _mm256_loadu_si256((__m256i *) &src[1 * 32]);
aes256w_cfb_decrypt(&d0, &d1, &d1, &d1, &d1, &d1, &d1, &d1, &cfb->feedback, cfb->roundKeys, 4,
cfb->num_rounds);
_mm256_storeu_si256((__m256i *) &dest[0 * 32], d0);
_mm256_storeu_si256((__m256i *) &dest[1 * 32], d1);
len -= 4 * CFB_BLOCK_SIZE;
src += 4 * CFB_BLOCK_SIZE;
dest += 4 * CFB_BLOCK_SIZE;
} else if (len >= 2 * CFB_BLOCK_SIZE) {
__m256i d0 = _mm256_loadu_si256((__m256i *) &src[0 * 32]);
aes256w_cfb_decrypt(&d0, &d0, &d0, &d0, &d0, &d0, &d0, &d0, &cfb->feedback, cfb->roundKeys, 2,
cfb->num_rounds);
_mm256_storeu_si256((__m256i *) &dest[0 * 32], d0);
len -= 2 * CFB_BLOCK_SIZE;
src += 2 * CFB_BLOCK_SIZE;
dest += 2 * CFB_BLOCK_SIZE;
} else {
//
// If we get here we have an odd block
// The odd block is broadcast into both lanes of d0
//
__m256i d0 = _mm256_broadcastsi128_si256(_mm_loadu_si128((__m128i *) &src[0 * 16]));
aes256w_cfb_decrypt(&d0, &d0, &d0, &d0, &d0, &d0, &d0, &d0, &cfb->feedback, cfb->roundKeys, 1,
cfb->num_rounds);
_mm_storeu_si128(((__m128i *) &dest[0 * 16]), _mm256_castsi256_si128(d0));
len -= CFB_BLOCK_SIZE;
src += CFB_BLOCK_SIZE;
dest += CFB_BLOCK_SIZE;
}
}
//
// load any trailing bytes into the buffer, the expectation is that
// whatever is passed in has to be decrypted, ideally callers will
// try and stick to the AES block size for as long as possible.
//
while (len > 0) {
*dest = cfb_decrypt_byte(cfb, *src);
len--;
dest++;
src++;
}
return (size_t) (dest - destStart);
}
unsigned char cfb_decrypt_byte(cfb_ctx *cfbCtx, unsigned char b) {
if (cfbCtx->buf_index == 0) {
// We need to generate a new encrypted feedback block to xor into the data.,
cfbCtx->mask = _mm_xor_si128(cfbCtx->feedback, cfbCtx->roundKeys[0]);
int j;
for (j = 1; j < cfbCtx->num_rounds; j++) {
cfbCtx->mask = _mm_aesenc_si128(cfbCtx->mask, cfbCtx->roundKeys[j]);
}
cfbCtx->mask = _mm_aesenclast_si128(cfbCtx->mask, cfbCtx->roundKeys[j]);
}
//
// incrementally mask becomes the last block of cipher text
//
unsigned char pt = ((unsigned char *) &cfbCtx->mask)[cfbCtx->buf_index] ^ b;
((unsigned char *) &cfbCtx->mask)[cfbCtx->buf_index++] = b; // Mask fills with last cipher text directly.
if (cfbCtx->buf_index == CFB_BLOCK_SIZE) {
cfbCtx->buf_index = 0;
cfbCtx->feedback = cfbCtx->mask;
}
return pt;
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