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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
#include <string.h>
#include <stdio.h>
#include "seccomon.h"
#include "secerr.h"
#include "blapit.h"
#include "blapii.h"
#ifndef NSS_DISABLE_CHACHAPOLY
#include "chacha20poly1305.h"
// Forward declaration from "Hacl_Chacha20_Vec128.h".
extern void Hacl_Chacha20_Vec128_chacha20(uint8_t *output, uint8_t *plain,
uint32_t len, uint8_t *k, uint8_t *n1,
uint32_t ctr);
// Forward declaration from "Hacl_Chacha20.h".
extern void Hacl_Chacha20_chacha20(uint8_t *output, uint8_t *plain, uint32_t len,
uint8_t *k, uint8_t *n1, uint32_t ctr);
#if defined(HAVE_INT128_SUPPORT) && (defined(NSS_X86_OR_X64) || defined(__aarch64__))
/* Use HACL* Poly1305 on 64-bit Intel and ARM */
#include "verified/Hacl_Poly1305_64.h"
#define NSS_POLY1305_64 1
#define Hacl_Poly1305_update Hacl_Poly1305_64_update
#define Hacl_Poly1305_mk_state Hacl_Poly1305_64_mk_state
#define Hacl_Poly1305_init Hacl_Poly1305_64_init
#define Hacl_Poly1305_finish Hacl_Poly1305_64_finish
typedef Hacl_Impl_Poly1305_64_State_poly1305_state Hacl_Impl_Poly1305_State_poly1305_state;
#else
/* All other platforms get the 32-bit poly1305 HACL* implementation. */
#include "verified/Hacl_Poly1305_32.h"
#define NSS_POLY1305_32 1
#define Hacl_Poly1305_update Hacl_Poly1305_32_update
#define Hacl_Poly1305_mk_state Hacl_Poly1305_32_mk_state
#define Hacl_Poly1305_init Hacl_Poly1305_32_init
#define Hacl_Poly1305_finish Hacl_Poly1305_32_finish
typedef Hacl_Impl_Poly1305_32_State_poly1305_state Hacl_Impl_Poly1305_State_poly1305_state;
#endif /* HAVE_INT128_SUPPORT */
static void
Poly1305PadUpdate(Hacl_Impl_Poly1305_State_poly1305_state state,
unsigned char *block, const unsigned char *p,
const unsigned int pLen)
{
unsigned int pRemLen = pLen % 16;
Hacl_Poly1305_update(state, (uint8_t *)p, (pLen / 16));
if (pRemLen > 0) {
memcpy(block, p + (pLen - pRemLen), pRemLen);
Hacl_Poly1305_update(state, block, 1);
}
}
/* Poly1305Do writes the Poly1305 authenticator of the given additional data
* and ciphertext to |out|. */
static void
Poly1305Do(unsigned char *out, const unsigned char *ad, unsigned int adLen,
const unsigned char *ciphertext, unsigned int ciphertextLen,
const unsigned char key[32])
{
#ifdef NSS_POLY1305_64
uint64_t stateStack[6U] = { 0U };
size_t offset = 3;
#elif defined NSS_POLY1305_32
uint32_t stateStack[10U] = { 0U };
size_t offset = 5;
#else
#error "This can't happen."
#endif
Hacl_Impl_Poly1305_State_poly1305_state state =
Hacl_Poly1305_mk_state(stateStack, stateStack + offset);
unsigned char block[16] = { 0 };
Hacl_Poly1305_init(state, (uint8_t *)key);
Poly1305PadUpdate(state, block, ad, adLen);
memset(block, 0, 16);
Poly1305PadUpdate(state, block, ciphertext, ciphertextLen);
unsigned int i;
unsigned int j;
for (i = 0, j = adLen; i < 8; i++, j >>= 8) {
block[i] = j;
}
for (i = 8, j = ciphertextLen; i < 16; i++, j >>= 8) {
block[i] = j;
}
Hacl_Poly1305_update(state, block, 1);
Hacl_Poly1305_finish(state, out, (uint8_t *)(key + 16));
#undef NSS_POLY1305_64
#undef NSS_POLY1305_32
}
#endif /* NSS_DISABLE_CHACHAPOLY */
SECStatus
ChaCha20Poly1305_InitContext(ChaCha20Poly1305Context *ctx,
const unsigned char *key, unsigned int keyLen,
unsigned int tagLen)
{
#ifdef NSS_DISABLE_CHACHAPOLY
return SECFailure;
#else
if (keyLen != 32) {
PORT_SetError(SEC_ERROR_BAD_KEY);
return SECFailure;
}
if (tagLen == 0 || tagLen > 16) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
return SECFailure;
}
PORT_Memcpy(ctx->key, key, sizeof(ctx->key));
ctx->tagLen = tagLen;
return SECSuccess;
#endif
}
ChaCha20Poly1305Context *
ChaCha20Poly1305_CreateContext(const unsigned char *key, unsigned int keyLen,
unsigned int tagLen)
{
#ifdef NSS_DISABLE_CHACHAPOLY
return NULL;
#else
ChaCha20Poly1305Context *ctx;
ctx = PORT_New(ChaCha20Poly1305Context);
if (ctx == NULL) {
return NULL;
}
if (ChaCha20Poly1305_InitContext(ctx, key, keyLen, tagLen) != SECSuccess) {
PORT_Free(ctx);
ctx = NULL;
}
return ctx;
#endif
}
void
ChaCha20Poly1305_DestroyContext(ChaCha20Poly1305Context *ctx, PRBool freeit)
{
#ifndef NSS_DISABLE_CHACHAPOLY
PORT_Memset(ctx, 0, sizeof(*ctx));
if (freeit) {
PORT_Free(ctx);
}
#endif
}
void
ChaCha20Xor(uint8_t *output, uint8_t *block, uint32_t len, uint8_t *k,
uint8_t *nonce, uint32_t ctr)
{
if (ssse3_support() || arm_neon_support()) {
Hacl_Chacha20_Vec128_chacha20(output, block, len, k, nonce, ctr);
} else {
Hacl_Chacha20_chacha20(output, block, len, k, nonce, ctr);
}
}
SECStatus
ChaCha20Poly1305_Seal(const ChaCha20Poly1305Context *ctx, unsigned char *output,
unsigned int *outputLen, unsigned int maxOutputLen,
const unsigned char *input, unsigned int inputLen,
const unsigned char *nonce, unsigned int nonceLen,
const unsigned char *ad, unsigned int adLen)
{
#ifdef NSS_DISABLE_CHACHAPOLY
return SECFailure;
#else
unsigned char block[64];
unsigned char tag[16];
if (nonceLen != 12) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
return SECFailure;
}
*outputLen = inputLen + ctx->tagLen;
if (maxOutputLen < *outputLen) {
PORT_SetError(SEC_ERROR_OUTPUT_LEN);
return SECFailure;
}
PORT_Memset(block, 0, sizeof(block));
// Generate a block of keystream. The first 32 bytes will be the poly1305
// key. The remainder of the block is discarded.
ChaCha20Xor(block, (uint8_t *)block, sizeof(block), (uint8_t *)ctx->key,
(uint8_t *)nonce, 0);
ChaCha20Xor(output, (uint8_t *)input, inputLen, (uint8_t *)ctx->key,
(uint8_t *)nonce, 1);
Poly1305Do(tag, ad, adLen, output, inputLen, block);
PORT_Memcpy(output + inputLen, tag, ctx->tagLen);
return SECSuccess;
#endif
}
SECStatus
ChaCha20Poly1305_Open(const ChaCha20Poly1305Context *ctx, unsigned char *output,
unsigned int *outputLen, unsigned int maxOutputLen,
const unsigned char *input, unsigned int inputLen,
const unsigned char *nonce, unsigned int nonceLen,
const unsigned char *ad, unsigned int adLen)
{
#ifdef NSS_DISABLE_CHACHAPOLY
return SECFailure;
#else
unsigned char block[64];
unsigned char tag[16];
unsigned int ciphertextLen;
if (nonceLen != 12) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
return SECFailure;
}
if (inputLen < ctx->tagLen) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
return SECFailure;
}
ciphertextLen = inputLen - ctx->tagLen;
*outputLen = ciphertextLen;
if (maxOutputLen < *outputLen) {
PORT_SetError(SEC_ERROR_OUTPUT_LEN);
return SECFailure;
}
PORT_Memset(block, 0, sizeof(block));
// Generate a block of keystream. The first 32 bytes will be the poly1305
// key. The remainder of the block is discarded.
ChaCha20Xor(block, (uint8_t *)block, sizeof(block), (uint8_t *)ctx->key,
(uint8_t *)nonce, 0);
Poly1305Do(tag, ad, adLen, input, ciphertextLen, block);
if (NSS_SecureMemcmp(tag, &input[ciphertextLen], ctx->tagLen) != 0) {
PORT_SetError(SEC_ERROR_BAD_DATA);
return SECFailure;
}
ChaCha20Xor(output, (uint8_t *)input, ciphertextLen, (uint8_t *)ctx->key,
(uint8_t *)nonce, 1);
return SECSuccess;
#endif
}
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