Differential D24855 Diff 72052 head/sys/crypto/chacha20/chacha-sw.c

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head/sys/crypto/chacha20/chacha-sw.c

	/* This file is in the public domain. */			/* This file is in the public domain. */

	#include <sys/cdefs.h>			#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");			__FBSDID("$FreeBSD$");

	#include <crypto/chacha20/chacha.h>			#include <crypto/chacha20/chacha.h>
	#include <opencrypto/xform_enc.h>			#include <opencrypto/xform_enc.h>

	static int			static int
	chacha20_xform_setkey(u_int8_t *sched, const u_int8_t key, int len)			chacha20_xform_setkey(void ctx, const uint8_t key, int len)
	{			{
	struct chacha_ctx *ctx;

	if (len != CHACHA_MINKEYLEN && len != 32)			if (len != CHACHA_MINKEYLEN && len != 32)
	return (EINVAL);			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);			chacha_keysetup(ctx, key, len * 8);
	return (0);			return (0);
	}			}

	static void			static void
	chacha20_xform_reinit(caddr_t key, const u_int8_t *iv)			chacha20_xform_reinit(void ctx, const u_int8_t iv)
	{			{
	struct chacha_ctx *ctx;

	ctx = (void *)key;
	chacha_ivsetup(ctx, iv + 8, iv);			chacha_ivsetup(ctx, iv + 8, iv);
	}			}

	static void			static void
	chacha20_xform_zerokey(u_int8_t **sched)			chacha20_xform_crypt(void ctx, const uint8_t in, uint8_t *out)
	{			{
	struct chacha_ctx *ctx;

	ctx = (void )sched;			chacha_encrypt_bytes(ctx, in, out, 1);
	explicit_bzero(ctx, sizeof(*ctx));
	free(ctx, M_CRYPTO_DATA);
	*sched = NULL;
	}			}

	static void			static void
	chacha20_xform_crypt(caddr_t cctx, u_int8_t *bytes)			chacha20_xform_crypt_multi(void ctx, const uint8_t in, uint8_t *out,
				size_t len)
	{			{
	struct chacha_ctx *ctx;

	ctx = (void *)cctx;			chacha_encrypt_bytes(ctx, in, out, len);
	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 = {			struct enc_xform enc_xform_chacha20 = {
	.type = CRYPTO_CHACHA20,			.type = CRYPTO_CHACHA20,
	.name = "chacha20",			.name = "chacha20",
				.ctxsize = sizeof(struct chacha_ctx),
	.blocksize = 1,			.blocksize = 1,
	.ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN,			.ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN,
	.minkey = CHACHA_MINKEYLEN,			.minkey = CHACHA_MINKEYLEN,
	.maxkey = 32,			.maxkey = 32,
	.encrypt = chacha20_xform_crypt,			.encrypt = chacha20_xform_crypt,
	.decrypt = chacha20_xform_crypt,			.decrypt = chacha20_xform_crypt,
	.setkey = chacha20_xform_setkey,			.setkey = chacha20_xform_setkey,
	.zerokey = chacha20_xform_zerokey,
	.reinit = chacha20_xform_reinit,			.reinit = chacha20_xform_reinit,
	.encrypt_multi = chacha20_xform_crypt_multi,			.encrypt_multi = chacha20_xform_crypt_multi,
	.decrypt_multi = chacha20_xform_crypt_multi,			.decrypt_multi = chacha20_xform_crypt_multi,
	};			};