1 files changed, 78 insertions, 0 deletions

diff --git a/sys/crypto/chacha20/chacha-sw.c b/sys/crypto/chacha20/chacha-sw.c
new file mode 100644
index 0000000000000..e874d48c606e2
--- /dev/null
+++ b/sys/crypto/chacha20/chacha-sw.c
@@ -0,0 +1,78 @@
+/* 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, 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, 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,
+};