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-rw-r--r--crypto/sm4_generic.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/crypto/sm4_generic.c b/crypto/sm4_generic.c
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+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * SM4 Cipher Algorithm.
+ *
+ * Copyright (C) 2018 ARM Limited or its affiliates.
+ * All rights reserved.
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/sm4.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
+/**
+ * sm4_setkey - Set the SM4 key.
+ * @tfm: The %crypto_tfm that is used in the context.
+ * @in_key: The input key.
+ * @key_len: The size of the key.
+ *
+ * This function uses sm4_expandkey() to expand the key.
+ * &sm4_ctx _must_ be the private data embedded in @tfm which is
+ * retrieved with crypto_tfm_ctx().
+ *
+ * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
+ */
+static int sm4_setkey(struct crypto_tfm *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ return sm4_expandkey(ctx, in_key, key_len);
+}
+
+/* encrypt a block of text */
+
+static void sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+{
+ const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ sm4_crypt_block(ctx->rkey_enc, out, in);
+}
+
+/* decrypt a block of text */
+
+static void sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+{
+ const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ sm4_crypt_block(ctx->rkey_dec, out, in);
+}
+
+static struct crypto_alg sm4_alg = {
+ .cra_name = "sm4",
+ .cra_driver_name = "sm4-generic",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = SM4_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct sm4_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .cipher = {
+ .cia_min_keysize = SM4_KEY_SIZE,
+ .cia_max_keysize = SM4_KEY_SIZE,
+ .cia_setkey = sm4_setkey,
+ .cia_encrypt = sm4_encrypt,
+ .cia_decrypt = sm4_decrypt
+ }
+ }
+};
+
+static int __init sm4_init(void)
+{
+ return crypto_register_alg(&sm4_alg);
+}
+
+static void __exit sm4_fini(void)
+{
+ crypto_unregister_alg(&sm4_alg);
+}
+
+subsys_initcall(sm4_init);
+module_exit(sm4_fini);
+
+MODULE_DESCRIPTION("SM4 Cipher Algorithm");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_CRYPTO("sm4");
+MODULE_ALIAS_CRYPTO("sm4-generic");