6c2bb98bc3
Up until now algorithms have been happy to get a context pointer since they know everything that's in the tfm already (e.g., alignment, block size). However, once we have parameterised algorithms, such information will be specific to each tfm. So the algorithm API needs to be changed to pass the tfm structure instead of the context pointer. This patch is basically a text substitution. The only tricky bit is the assembly routines that need to get the context pointer offset through asm-offsets.h. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
/*
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* Cryptographic API.
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*
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* Null algorithms, aka Much Ado About Nothing.
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*
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* These are needed for IPsec, and may be useful in general for
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* testing & debugging.
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*
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* The null cipher is compliant with RFC2410.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <asm/scatterlist.h>
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#include <linux/crypto.h>
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#include <linux/string.h>
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#define NULL_KEY_SIZE 0
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#define NULL_BLOCK_SIZE 1
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#define NULL_DIGEST_SIZE 0
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static int null_compress(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen)
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{
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if (slen > *dlen)
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return -EINVAL;
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memcpy(dst, src, slen);
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*dlen = slen;
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return 0;
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}
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static void null_init(struct crypto_tfm *tfm)
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{ }
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static void null_update(struct crypto_tfm *tfm, const u8 *data,
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unsigned int len)
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{ }
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static void null_final(struct crypto_tfm *tfm, u8 *out)
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{ }
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static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen, u32 *flags)
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{ return 0; }
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static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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memcpy(dst, src, NULL_BLOCK_SIZE);
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}
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static struct crypto_alg compress_null = {
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.cra_name = "compress_null",
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_ctxsize = 0,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(compress_null.cra_list),
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.cra_u = { .compress = {
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.coa_compress = null_compress,
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.coa_decompress = null_compress } }
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};
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static struct crypto_alg digest_null = {
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.cra_name = "digest_null",
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_ctxsize = 0,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(digest_null.cra_list),
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.cra_u = { .digest = {
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.dia_digestsize = NULL_DIGEST_SIZE,
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.dia_init = null_init,
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.dia_update = null_update,
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.dia_final = null_final } }
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};
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static struct crypto_alg cipher_null = {
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.cra_name = "cipher_null",
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = NULL_BLOCK_SIZE,
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.cra_ctxsize = 0,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(cipher_null.cra_list),
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.cra_u = { .cipher = {
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.cia_min_keysize = NULL_KEY_SIZE,
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.cia_max_keysize = NULL_KEY_SIZE,
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.cia_setkey = null_setkey,
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.cia_encrypt = null_crypt,
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.cia_decrypt = null_crypt } }
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};
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MODULE_ALIAS("compress_null");
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MODULE_ALIAS("digest_null");
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MODULE_ALIAS("cipher_null");
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static int __init init(void)
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{
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int ret = 0;
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ret = crypto_register_alg(&cipher_null);
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if (ret < 0)
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goto out;
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ret = crypto_register_alg(&digest_null);
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if (ret < 0) {
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crypto_unregister_alg(&cipher_null);
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goto out;
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}
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ret = crypto_register_alg(&compress_null);
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if (ret < 0) {
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crypto_unregister_alg(&digest_null);
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crypto_unregister_alg(&cipher_null);
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goto out;
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}
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out:
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return ret;
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}
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static void __exit fini(void)
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{
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crypto_unregister_alg(&compress_null);
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crypto_unregister_alg(&digest_null);
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crypto_unregister_alg(&cipher_null);
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}
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module_init(init);
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module_exit(fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Null Cryptographic Algorithms");
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