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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Netflix Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 REGENTS 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 REGENTS 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 <opencrypto/xform_auth.h>
#include <opencrypto/xform_enc.h>
#include <sodium/crypto_onetimeauth_poly1305.h>
#include <sodium/crypto_stream_chacha20.h>
struct chacha20_poly1305_cipher_ctx {
const void *key;
uint32_t ic;
bool ietf;
char nonce[CHACHA20_POLY1305_IV_LEN];
};
static int
chacha20_poly1305_setkey(void *vctx, const uint8_t *key, int len)
{
struct chacha20_poly1305_cipher_ctx *ctx = vctx;
if (len != CHACHA20_POLY1305_KEY)
return (EINVAL);
ctx->key = key;
return (0);
}
static void
chacha20_poly1305_reinit(void *vctx, const uint8_t *iv, size_t ivlen)
{
struct chacha20_poly1305_cipher_ctx *ctx = vctx;
KASSERT(ivlen == 8 || ivlen == sizeof(ctx->nonce),
("%s: invalid nonce length", __func__));
/* Block 0 is used for the poly1305 key. */
memcpy(ctx->nonce, iv, ivlen);
ctx->ietf = (ivlen == CHACHA20_POLY1305_IV_LEN);
ctx->ic = 1;
}
static void
chacha20_poly1305_crypt(void *vctx, const uint8_t *in, uint8_t *out)
{
struct chacha20_poly1305_cipher_ctx *ctx = vctx;
int error;
if (ctx->ietf)
error = crypto_stream_chacha20_ietf_xor_ic(out, in,
CHACHA20_NATIVE_BLOCK_LEN, ctx->nonce, ctx->ic, ctx->key);
else
error = crypto_stream_chacha20_xor_ic(out, in,
CHACHA20_NATIVE_BLOCK_LEN, ctx->nonce, ctx->ic, ctx->key);
KASSERT(error == 0, ("%s failed: %d", __func__, error));
ctx->ic++;
}
static void
chacha20_poly1305_crypt_last(void *vctx, const uint8_t *in, uint8_t *out,
size_t len)
{
struct chacha20_poly1305_cipher_ctx *ctx = vctx;
int error;
if (ctx->ietf)
error = crypto_stream_chacha20_ietf_xor_ic(out, in, len,
ctx->nonce, ctx->ic, ctx->key);
else
error = crypto_stream_chacha20_xor_ic(out, in, len, ctx->nonce,
ctx->ic, ctx->key);
KASSERT(error == 0, ("%s failed: %d", __func__, error));
}
struct enc_xform enc_xform_chacha20_poly1305 = {
.type = CRYPTO_CHACHA20_POLY1305,
.name = "ChaCha20-Poly1305",
.ctxsize = sizeof(struct chacha20_poly1305_cipher_ctx),
.blocksize = 1,
.native_blocksize = CHACHA20_NATIVE_BLOCK_LEN,
.ivsize = CHACHA20_POLY1305_IV_LEN,
.minkey = CHACHA20_POLY1305_KEY,
.maxkey = CHACHA20_POLY1305_KEY,
.encrypt = chacha20_poly1305_crypt,
.decrypt = chacha20_poly1305_crypt,
.setkey = chacha20_poly1305_setkey,
.reinit = chacha20_poly1305_reinit,
.encrypt_last = chacha20_poly1305_crypt_last,
.decrypt_last = chacha20_poly1305_crypt_last,
};
struct chacha20_poly1305_auth_ctx {
struct crypto_onetimeauth_poly1305_state state;
const void *key;
};
CTASSERT(sizeof(union authctx) >= sizeof(struct chacha20_poly1305_auth_ctx));
static void
chacha20_poly1305_Init(void *vctx)
{
}
static void
chacha20_poly1305_Setkey(void *vctx, const uint8_t *key, u_int klen)
{
struct chacha20_poly1305_auth_ctx *ctx = vctx;
ctx->key = key;
}
static void
chacha20_poly1305_Reinit(void *vctx, const uint8_t *nonce, u_int noncelen)
{
struct chacha20_poly1305_auth_ctx *ctx = vctx;
char block[CHACHA20_NATIVE_BLOCK_LEN];
switch (noncelen) {
case 8:
crypto_stream_chacha20(block, sizeof(block), nonce, ctx->key);
break;
case CHACHA20_POLY1305_IV_LEN:
crypto_stream_chacha20_ietf(block, sizeof(block), nonce, ctx->key);
break;
default:
__assert_unreachable();
}
crypto_onetimeauth_poly1305_init(&ctx->state, block);
explicit_bzero(block, sizeof(block));
}
static int
chacha20_poly1305_Update(void *vctx, const void *data, u_int len)
{
struct chacha20_poly1305_auth_ctx *ctx = vctx;
crypto_onetimeauth_poly1305_update(&ctx->state, data, len);
return (0);
}
static void
chacha20_poly1305_Final(uint8_t *digest, void *vctx)
{
struct chacha20_poly1305_auth_ctx *ctx = vctx;
crypto_onetimeauth_poly1305_final(&ctx->state, digest);
}
struct auth_hash auth_hash_chacha20_poly1305 = {
.type = CRYPTO_POLY1305,
.name = "ChaCha20-Poly1305",
.keysize = POLY1305_KEY_LEN,
.hashsize = POLY1305_HASH_LEN,
.ctxsize = sizeof(struct chacha20_poly1305_auth_ctx),
.blocksize = crypto_onetimeauth_poly1305_BYTES,
.Init = chacha20_poly1305_Init,
.Setkey = chacha20_poly1305_Setkey,
.Reinit = chacha20_poly1305_Reinit,
.Update = chacha20_poly1305_Update,
.Final = chacha20_poly1305_Final,
};
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