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#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "core.h"
#include "crypto_stream_chacha20.h"
#include "private/common.h"
#include "private/sse2_64_32.h"
#include "utils.h"
#if defined(HAVE_EMMINTRIN_H) && defined(HAVE_TMMINTRIN_H)
# ifdef __GNUC__
# pragma GCC target("sse2")
# pragma GCC target("ssse3")
# endif
# include <emmintrin.h>
# include <tmmintrin.h>
# include "../stream_chacha20.h"
# include "chacha20_dolbeau-ssse3.h"
# define ROUNDS 20
typedef struct chacha_ctx {
uint32_t input[16];
} chacha_ctx;
static void
chacha_keysetup(chacha_ctx *ctx, const uint8_t *k)
{
ctx->input[0] = 0x61707865;
ctx->input[1] = 0x3320646e;
ctx->input[2] = 0x79622d32;
ctx->input[3] = 0x6b206574;
ctx->input[4] = LOAD32_LE(k + 0);
ctx->input[5] = LOAD32_LE(k + 4);
ctx->input[6] = LOAD32_LE(k + 8);
ctx->input[7] = LOAD32_LE(k + 12);
ctx->input[8] = LOAD32_LE(k + 16);
ctx->input[9] = LOAD32_LE(k + 20);
ctx->input[10] = LOAD32_LE(k + 24);
ctx->input[11] = LOAD32_LE(k + 28);
}
static void
chacha_ivsetup(chacha_ctx *ctx, const uint8_t *iv, const uint8_t *counter)
{
ctx->input[12] = counter == NULL ? 0 : LOAD32_LE(counter + 0);
ctx->input[13] = counter == NULL ? 0 : LOAD32_LE(counter + 4);
ctx->input[14] = LOAD32_LE(iv + 0);
ctx->input[15] = LOAD32_LE(iv + 4);
}
static void
chacha_ietf_ivsetup(chacha_ctx *ctx, const uint8_t *iv, const uint8_t *counter)
{
ctx->input[12] = counter == NULL ? 0 : LOAD32_LE(counter);
ctx->input[13] = LOAD32_LE(iv + 0);
ctx->input[14] = LOAD32_LE(iv + 4);
ctx->input[15] = LOAD32_LE(iv + 8);
}
static void
chacha20_encrypt_bytes(chacha_ctx *ctx, const uint8_t *m, uint8_t *c,
unsigned long long bytes)
{
uint32_t * const x = &ctx->input[0];
if (!bytes) {
return; /* LCOV_EXCL_LINE */
}
# include "u4.h"
# include "u1.h"
# include "u0.h"
}
static int
stream_ref(unsigned char *c, unsigned long long clen, const unsigned char *n,
const unsigned char *k)
{
struct chacha_ctx ctx;
if (!clen) {
return 0;
}
COMPILER_ASSERT(crypto_stream_chacha20_KEYBYTES == 256 / 8);
chacha_keysetup(&ctx, k);
chacha_ivsetup(&ctx, n, NULL);
memset(c, 0, clen);
chacha20_encrypt_bytes(&ctx, c, c, clen);
sodium_memzero(&ctx, sizeof ctx);
return 0;
}
static int
stream_ietf_ext_ref(unsigned char *c, unsigned long long clen,
const unsigned char *n, const unsigned char *k)
{
struct chacha_ctx ctx;
if (!clen) {
return 0;
}
COMPILER_ASSERT(crypto_stream_chacha20_KEYBYTES == 256 / 8);
chacha_keysetup(&ctx, k);
chacha_ietf_ivsetup(&ctx, n, NULL);
memset(c, 0, clen);
chacha20_encrypt_bytes(&ctx, c, c, clen);
sodium_memzero(&ctx, sizeof ctx);
return 0;
}
static int
stream_ref_xor_ic(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n, uint64_t ic,
const unsigned char *k)
{
struct chacha_ctx ctx;
uint8_t ic_bytes[8];
uint32_t ic_high;
uint32_t ic_low;
if (!mlen) {
return 0;
}
ic_high = (uint32_t) (ic >> 32);
ic_low = (uint32_t) ic;
STORE32_LE(&ic_bytes[0], ic_low);
STORE32_LE(&ic_bytes[4], ic_high);
chacha_keysetup(&ctx, k);
chacha_ivsetup(&ctx, n, ic_bytes);
chacha20_encrypt_bytes(&ctx, m, c, mlen);
sodium_memzero(&ctx, sizeof ctx);
return 0;
}
static int
stream_ietf_ext_ref_xor_ic(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n,
uint32_t ic, const unsigned char *k)
{
struct chacha_ctx ctx;
uint8_t ic_bytes[4];
if (!mlen) {
return 0;
}
STORE32_LE(ic_bytes, ic);
chacha_keysetup(&ctx, k);
chacha_ietf_ivsetup(&ctx, n, ic_bytes);
chacha20_encrypt_bytes(&ctx, m, c, mlen);
sodium_memzero(&ctx, sizeof ctx);
return 0;
}
struct crypto_stream_chacha20_implementation
crypto_stream_chacha20_dolbeau_ssse3_implementation = {
SODIUM_C99(.stream =) stream_ref,
SODIUM_C99(.stream_ietf_ext =) stream_ietf_ext_ref,
SODIUM_C99(.stream_xor_ic =) stream_ref_xor_ic,
SODIUM_C99(.stream_ietf_ext_xor_ic =) stream_ietf_ext_ref_xor_ic
};
#endif
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