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https://github.com/torvalds/linux
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611a23c2d3
There are no remaining users of the cipher implementation, and there are no meaningful ways in which the arc4 cipher can be combined with templates other than ECB (and the way we do provide that combination is highly dubious to begin with). So let's drop the arc4 cipher altogether, and only keep the ecb(arc4) skcipher, which is used in various places in the kernel. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
82 lines
2 KiB
C
82 lines
2 KiB
C
/*
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* Cryptographic API
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*
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* ARC4 Cipher Algorithm
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*
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* Jon Oberheide <jon@oberheide.org>
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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 <crypto/algapi.h>
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#include <crypto/arc4.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/init.h>
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#include <linux/module.h>
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static int crypto_arc4_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
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return arc4_setkey(ctx, in_key, key_len);
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}
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static int crypto_arc4_crypt(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 arc4_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes > 0) {
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arc4_crypt(ctx, walk.dst.virt.addr, walk.src.virt.addr,
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walk.nbytes);
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err = skcipher_walk_done(&walk, 0);
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}
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return err;
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}
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static struct skcipher_alg arc4_alg = {
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/*
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* For legacy reasons, this is named "ecb(arc4)", not "arc4".
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* Nevertheless it's actually a stream cipher, not a block cipher.
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*/
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.base.cra_name = "ecb(arc4)",
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.base.cra_driver_name = "ecb(arc4)-generic",
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.base.cra_priority = 100,
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.base.cra_blocksize = ARC4_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct arc4_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = ARC4_MIN_KEY_SIZE,
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.max_keysize = ARC4_MAX_KEY_SIZE,
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.setkey = crypto_arc4_setkey,
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.encrypt = crypto_arc4_crypt,
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.decrypt = crypto_arc4_crypt,
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};
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static int __init arc4_init(void)
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{
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return crypto_register_skcipher(&arc4_alg);
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}
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static void __exit arc4_exit(void)
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{
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crypto_unregister_skcipher(&arc4_alg);
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}
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subsys_initcall(arc4_init);
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module_exit(arc4_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
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MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
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MODULE_ALIAS_CRYPTO("ecb(arc4)");
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