110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/*
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* ECB: Electronic CodeBook mode
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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static int crypto_ecb_crypt(struct skcipher_request *req,
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struct crypto_cipher *cipher,
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
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{
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const unsigned int bsize = crypto_cipher_blocksize(cipher);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) != 0) {
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const u8 *src = walk.src.virt.addr;
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u8 *dst = walk.dst.virt.addr;
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do {
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fn(crypto_cipher_tfm(cipher), dst, src);
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src += bsize;
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dst += bsize;
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} while ((nbytes -= bsize) >= bsize);
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static int crypto_ecb_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
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return crypto_ecb_crypt(req, cipher,
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crypto_cipher_alg(cipher)->cia_encrypt);
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}
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static int crypto_ecb_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
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return crypto_ecb_crypt(req, cipher,
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crypto_cipher_alg(cipher)->cia_decrypt);
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}
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static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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struct skcipher_instance *inst;
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struct crypto_alg *alg;
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int err;
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inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
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if (IS_ERR(inst))
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return PTR_ERR(inst);
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inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
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inst->alg.encrypt = crypto_ecb_encrypt;
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inst->alg.decrypt = crypto_ecb_decrypt;
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err = skcipher_register_instance(tmpl, inst);
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if (err)
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inst->free(inst);
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crypto_mod_put(alg);
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return err;
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}
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static struct crypto_template crypto_ecb_tmpl = {
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.name = "ecb",
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.create = crypto_ecb_create,
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.module = THIS_MODULE,
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};
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static int __init crypto_ecb_module_init(void)
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{
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return crypto_register_template(&crypto_ecb_tmpl);
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}
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static void __exit crypto_ecb_module_exit(void)
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{
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crypto_unregister_template(&crypto_ecb_tmpl);
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}
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subsys_initcall(crypto_ecb_module_init);
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module_exit(crypto_ecb_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ECB block cipher mode of operation");
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MODULE_ALIAS_CRYPTO("ecb");
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