1 files changed, 104 insertions, 0 deletions
diff --git a/crypto/ecb.c b/crypto/ecb.c
new file mode 100644
index 000000000..71fbb0543
--- /dev/null
+++ b/crypto/ecb.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ECB: Electronic CodeBook mode
+ *
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+static int crypto_ecb_crypt(struct skcipher_request *req,
+			    struct crypto_cipher *cipher,
+			    void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
+{
+	const unsigned int bsize = crypto_cipher_blocksize(cipher);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes) != 0) {
+		const u8 *src = walk.src.virt.addr;
+		u8 *dst = walk.dst.virt.addr;
+
+		do {
+			fn(crypto_cipher_tfm(cipher), dst, src);
+
+			src += bsize;
+			dst += bsize;
+		} while ((nbytes -= bsize) >= bsize);
+
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	return err;
+}
+
+static int crypto_ecb_encrypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
+
+	return crypto_ecb_crypt(req, cipher,
+				crypto_cipher_alg(cipher)->cia_encrypt);
+}
+
+static int crypto_ecb_decrypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
+
+	return crypto_ecb_crypt(req, cipher,
+				crypto_cipher_alg(cipher)->cia_decrypt);
+}
+
+static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+	struct skcipher_instance *inst;
+	int err;
+
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
+	if (IS_ERR(inst))
+		return PTR_ERR(inst);
+
+	inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
+
+	inst->alg.encrypt = crypto_ecb_encrypt;
+	inst->alg.decrypt = crypto_ecb_decrypt;
+
+	err = skcipher_register_instance(tmpl, inst);
+	if (err)
+		inst->free(inst);
+
+	return err;
+}
+
+static struct crypto_template crypto_ecb_tmpl = {
+	.name = "ecb",
+	.create = crypto_ecb_create,
+	.module = THIS_MODULE,
+};
+
+static int __init crypto_ecb_module_init(void)
+{
+	return crypto_register_template(&crypto_ecb_tmpl);
+}
+
+static void __exit crypto_ecb_module_exit(void)
+{
+	crypto_unregister_template(&crypto_ecb_tmpl);
+}
+
+subsys_initcall(crypto_ecb_module_init);
+module_exit(crypto_ecb_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ECB block cipher mode of operation");
+MODULE_ALIAS_CRYPTO("ecb");