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https://github.com/torvalds/linux
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0eb76ba29d
The cipher routines in the crypto API are mostly intended for templates implementing skcipher modes generically in software, and shouldn't be used outside of the crypto subsystem. So move the prototypes and all related definitions to a new header file under include/crypto/internal. Also, let's use the new module namespace feature to move the symbol exports into a new namespace CRYPTO_INTERNAL. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <crypto/algapi.h>
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#include <crypto/internal/cipher.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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int err;
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inst = skcipher_alloc_instance_simple(tmpl, tb);
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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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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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