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/* 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(void *ctx, const uint8_t *key, int len)
{
if (len != CHACHA_MINKEYLEN && len != 32)
return (EINVAL);
chacha_keysetup(ctx, key, len * 8);
return (0);
}
static void
chacha20_xform_reinit(void *ctx, const uint8_t *iv)
{
chacha_ivsetup(ctx, iv + 8, iv);
}
static void
chacha20_xform_crypt(void *ctx, const uint8_t *in, uint8_t *out)
{
chacha_encrypt_bytes(ctx, in, out, CHACHA_BLOCKLEN);
}
static void
chacha20_xform_crypt_last(void *ctx, const uint8_t *in, uint8_t *out,
size_t len)
{
chacha_encrypt_bytes(ctx, in, out, len);
}
const struct enc_xform enc_xform_chacha20 = {
.type = CRYPTO_CHACHA20,
.name = "chacha20",
.ctxsize = sizeof(struct chacha_ctx),
.blocksize = 1,
.native_blocksize = CHACHA_BLOCKLEN,
.ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN,
.minkey = CHACHA_MINKEYLEN,
.maxkey = 32,
.encrypt = chacha20_xform_crypt,
.decrypt = chacha20_xform_crypt,
.setkey = chacha20_xform_setkey,
.reinit = chacha20_xform_reinit,
.encrypt_last = chacha20_xform_crypt_last,
.decrypt_last = chacha20_xform_crypt_last,
};
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