| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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| 2 | /* |
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| 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 <jon@oberheide.org> |
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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, out: dst, in: src, len: 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(alg: &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(alg: &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 <jon@oberheide.org>" ); |
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| 82 | MODULE_ALIAS_CRYPTO("ecb(arc4)" ); |
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| 83 | |
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