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#include <machine/rtems-bsd-kernel-space.h>
/* This file is in the public domain. */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <crypto/chacha20/chacha.h>
#include <opencrypto/xform_enc.h>
static int
chacha20_xform_setkey(u_int8_t **sched, const u_int8_t *key, int len)
{
struct chacha_ctx *ctx;
if (len != CHACHA_MINKEYLEN && len != 32)
return (EINVAL);
ctx = malloc(sizeof(*ctx), M_CRYPTO_DATA, M_NOWAIT | M_ZERO);
*sched = (void *)ctx;
if (ctx == NULL)
return (ENOMEM);
chacha_keysetup(ctx, key, len * 8);
return (0);
}
static void
chacha20_xform_reinit(caddr_t key, const u_int8_t *iv)
{
struct chacha_ctx *ctx;
ctx = (void *)key;
chacha_ivsetup(ctx, iv + 8, iv);
}
static void
chacha20_xform_zerokey(u_int8_t **sched)
{
struct chacha_ctx *ctx;
ctx = (void *)*sched;
explicit_bzero(ctx, sizeof(*ctx));
free(ctx, M_CRYPTO_DATA);
*sched = NULL;
}
static void
chacha20_xform_crypt(caddr_t cctx, u_int8_t *bytes)
{
struct chacha_ctx *ctx;
ctx = (void *)cctx;
chacha_encrypt_bytes(ctx, bytes, bytes, 1);
}
static void
chacha20_xform_crypt_multi(void *vctx, uint8_t *bytes, size_t len)
{
struct chacha_ctx *ctx;
ctx = vctx;
chacha_encrypt_bytes(ctx, bytes, bytes, len);
}
struct enc_xform enc_xform_chacha20 = {
.type = CRYPTO_CHACHA20,
.name = "chacha20",
.blocksize = 1,
.ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN,
.minkey = CHACHA_MINKEYLEN,
.maxkey = 32,
.encrypt = chacha20_xform_crypt,
.decrypt = chacha20_xform_crypt,
.setkey = chacha20_xform_setkey,
.zerokey = chacha20_xform_zerokey,
.reinit = chacha20_xform_reinit,
.encrypt_multi = chacha20_xform_crypt_multi,
.decrypt_multi = chacha20_xform_crypt_multi,
};
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