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/*
* Copyright (c) 2015 Mike Belopuhov
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <crypto/chacha_private.h>
#include <crypto/poly1305.h>
#include <crypto/chachapoly.h>
int
chacha20_setkey(void *sched, u_int8_t *key, int len)
{
struct chacha20_ctx *ctx = (struct chacha20_ctx *)sched;
if (len != CHACHA20_KEYSIZE + CHACHA20_SALT)
return (-1);
/* initial counter is 1 */
ctx->nonce[0] = 1;
memcpy(ctx->nonce + CHACHA20_CTR, key + CHACHA20_KEYSIZE,
CHACHA20_SALT);
chacha_keysetup((chacha_ctx *)&ctx->block, key, CHACHA20_KEYSIZE * 8);
return (0);
}
void
chacha20_reinit(caddr_t key, u_int8_t *iv)
{
struct chacha20_ctx *ctx = (struct chacha20_ctx *)key;
chacha_ivsetup((chacha_ctx *)ctx->block, iv, ctx->nonce);
}
void
chacha20_crypt(caddr_t key, u_int8_t *data)
{
struct chacha20_ctx *ctx = (struct chacha20_ctx *)key;
chacha_encrypt_bytes((chacha_ctx *)ctx->block, data, data,
CHACHA20_BLOCK_LEN);
}
void
Chacha20_Poly1305_Init(void *xctx)
{
CHACHA20_POLY1305_CTX *ctx = xctx;
memset(ctx, 0, sizeof(*ctx));
}
void
Chacha20_Poly1305_Setkey(void *xctx, const uint8_t *key, uint16_t klen)
{
CHACHA20_POLY1305_CTX *ctx = xctx;
/* salt is provided with the key material */
memcpy(ctx->nonce + CHACHA20_CTR, key + CHACHA20_KEYSIZE,
CHACHA20_SALT);
chacha_keysetup((chacha_ctx *)&ctx->chacha, key, CHACHA20_KEYSIZE * 8);
}
void
Chacha20_Poly1305_Reinit(void *xctx, const uint8_t *iv, uint16_t ivlen)
{
CHACHA20_POLY1305_CTX *ctx = xctx;
/* initial counter is 0 */
chacha_ivsetup((chacha_ctx *)&ctx->chacha, iv, ctx->nonce);
chacha_encrypt_bytes((chacha_ctx *)&ctx->chacha, ctx->key, ctx->key,
POLY1305_KEYLEN);
poly1305_init((poly1305_state *)&ctx->poly, ctx->key);
}
int
Chacha20_Poly1305_Update(void *xctx, const uint8_t *data, uint16_t len)
{
static const char zeroes[POLY1305_BLOCK_LEN];
CHACHA20_POLY1305_CTX *ctx = xctx;
size_t rem;
poly1305_update((poly1305_state *)&ctx->poly, data, len);
/* number of bytes in the last 16 byte block */
rem = (len + POLY1305_BLOCK_LEN) & (POLY1305_BLOCK_LEN - 1);
if (rem > 0)
poly1305_update((poly1305_state *)&ctx->poly, zeroes,
POLY1305_BLOCK_LEN - rem);
return (0);
}
void
Chacha20_Poly1305_Final(uint8_t tag[POLY1305_TAGLEN], void *xctx)
{
CHACHA20_POLY1305_CTX *ctx = xctx;
poly1305_finish((poly1305_state *)&ctx->poly, tag);
explicit_bzero(ctx, sizeof(*ctx));
}
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