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nfqws2: optimize aes-ctr gamma xor

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bol-van
2025-11-23 15:15:39 +03:00
parent f1d02aa81d
commit c65b28c3f7
2 changed files with 33 additions and 23 deletions
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53
nfq2/crypto/aes-ctr.c
View File

@@ -3,46 +3,55 @@
#define AES_BLOCKLEN 16
#if defined(__GNUC__) && !defined(__llvm__)
__attribute__((optimize ("no-strict-aliasing")))
#endif
void aes_ctr_xcrypt_buffer(aes_context *ctx, const uint8_t *iv, const uint8_t *in, size_t length, uint8_t *out)
{
uint8_t bi, buffer[AES_BLOCKLEN], ivc[AES_BLOCKLEN];
size_t i;
size_t i, l16 = length & ~0xF;
memcpy(ivc,iv,AES_BLOCKLEN);
memcpy(ivc, iv, AES_BLOCKLEN);
for (i = 0, bi = AES_BLOCKLEN; i < length; ++i, ++bi)
for (i = 0; i < l16; i += 16)
{
if (bi == AES_BLOCKLEN) /* we need to regen xor complement in buffer */
{
memcpy(buffer, ivc, AES_BLOCKLEN);
aes_cipher(ctx, buffer, buffer);
memcpy(buffer, ivc, AES_BLOCKLEN);
aes_cipher(ctx, buffer, buffer);
/* Increment ivc and handle overflow */
for (bi = (AES_BLOCKLEN - 1); bi >= 0; --bi)
// Increment ivc and handle overflow
for (bi = (AES_BLOCKLEN - 1); bi >= 0; --bi)
{
// inc will owerflow
if (ivc[bi] == 255)
{
/* inc will owerflow */
if (ivc[bi] == 255)
{
ivc[bi] = 0;
continue;
}
ivc[bi] += 1;
break;
ivc[bi] = 0;
continue;
}
bi = 0;
ivc[bi]++;;
break;
}
out[i] = in[i] ^ buffer[bi];
*((uint64_t*)(out + i)) = *((uint64_t*)(in + i)) ^ ((uint64_t*)buffer)[0];
*((uint64_t*)(out + i + 8)) = *((uint64_t*)(in + i + 8)) ^ ((uint64_t*)buffer)[1];
}
if (i<length)
{
memcpy(buffer, ivc, AES_BLOCKLEN);
aes_cipher(ctx, buffer, buffer);
for (bi=0 ; i < length; i++, bi++)
out[i] = in[i] ^ buffer[bi];
}
}
int aes_ctr_crypt(const uint8_t *key, const size_t key_len, const uint8_t *iv, const uint8_t *in, size_t length, uint8_t *out)
int aes_ctr_crypt(const uint8_t *key, unsigned int key_len, const uint8_t *iv, const uint8_t *in, size_t length, uint8_t *out)
{
int ret=0;
int ret = 0;
aes_context ctx;
aes_init_keygen_tables();
if (!(ret=aes_setkey(&ctx, AES_ENCRYPT, key, key_len)))
if (!(ret = aes_setkey(&ctx, AES_ENCRYPT, key, key_len)))
aes_ctr_xcrypt_buffer(&ctx, iv, in, length, out);
return ret;

3
nfq2/crypto/aes-ctr.h
View File

@@ -4,4 +4,5 @@
#include "aes.h"
void aes_ctr_xcrypt_buffer(aes_context *ctx, const uint8_t *iv, const uint8_t *in, size_t length, uint8_t *out);
int aes_ctr_crypt(const uint8_t *key, const size_t key_len, const uint8_t *iv, const uint8_t *in, size_t length, uint8_t *out);
int aes_ctr_crypt(const uint8_t *key, unsigned int key_len, const uint8_t *iv, const uint8_t *in, size_t length, uint8_t *out);