| 1 | |
| 2 | |
| 3 | * Cryptographic API
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| 4 | *
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| 5 | * ARC4 Cipher Algorithm
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| 6 | *
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| 7 | * Jon Oberheide <[email protected]>
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| 8 |
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| 9 |
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| 10 | #include <crypto/arc4.h>
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| 11 | #include <crypto/internal/skcipher.h>
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| 12 | #include <linux/init.h>
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| 13 | #include <linux/kernel.h>
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| 14 | #include <linux/module.h>
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| 15 | #include <linux/sched.h>
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| 16 |
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| 17 | #define ARC4_ALIGN __alignof__(struct arc4_ctx)
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| 18 |
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| 19 | static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key,
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| 20 | unsigned int key_len)
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| 21 | {
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| 22 | struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
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| 23 |
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| 24 | return arc4_setkey(ctx, in_key, key_len);
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| 25 | }
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| 26 |
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| 27 | static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src,
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| 28 | u8 *dst, unsigned nbytes, u8 *siv, u32 flags)
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| 29 | {
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| 30 | struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
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| 31 |
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| 32 | if (!(flags & CRYPTO_LSKCIPHER_FLAG_CONT))
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| 33 | memcpy(siv, ctx, sizeof(*ctx));
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| 34 |
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| 35 | ctx = (struct arc4_ctx *)siv;
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| 36 |
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| 37 | arc4_crypt(ctx, dst, src, nbytes);
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| 38 | return 0;
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| 39 | }
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| 40 |
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| 41 | static int crypto_arc4_init(struct crypto_lskcipher *tfm)
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| 42 | {
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| 43 | pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",
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| 44 | current->comm, (unsigned long)current->pid);
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| 45 |
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| 46 | return 0;
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| 47 | }
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| 48 |
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| 49 | static struct lskcipher_alg arc4_alg = {
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| 50 | .co.base.cra_name = "arc4",
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| 51 | .co.base.cra_driver_name = "arc4-generic",
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| 52 | .co.base.cra_priority = 100,
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| 53 | .co.base.cra_blocksize = ARC4_BLOCK_SIZE,
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| 54 | .co.base.cra_ctxsize = sizeof(struct arc4_ctx),
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| 55 | .co.base.cra_alignmask = ARC4_ALIGN - 1,
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| 56 | .co.base.cra_module = THIS_MODULE,
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| 57 | .co.min_keysize = ARC4_MIN_KEY_SIZE,
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| 58 | .co.max_keysize = ARC4_MAX_KEY_SIZE,
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| 59 | .co.statesize = sizeof(struct arc4_ctx),
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| 60 | .setkey = crypto_arc4_setkey,
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| 61 | .encrypt = crypto_arc4_crypt,
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| 62 | .decrypt = crypto_arc4_crypt,
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| 63 | .init = crypto_arc4_init,
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| 64 | };
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| 65 |
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| 66 | static int __init arc4_init(void)
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| 67 | {
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| 68 | return crypto_register_lskcipher(&arc4_alg);
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| 69 | }
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| 70 |
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| 71 | static void __exit arc4_exit(void)
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| 72 | {
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| 73 | crypto_unregister_lskcipher(&arc4_alg);
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| 74 | }
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| 75 |
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| 76 | module_init(arc4_init);
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| 77 | module_exit(arc4_exit);
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| 78 |
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| 79 | MODULE_LICENSE("GPL");
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| 80 | MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
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| 81 | MODULE_AUTHOR("Jon Oberheide <[email protected]>");
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| 82 | MODULE_ALIAS_CRYPTO("ecb(arc4)");
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