| 1 | |
| 2 | |
| 3 | * Cryptographic API.
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| 4 | *
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| 5 | * Single-block cipher operations.
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| 6 | *
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| 7 | * Copyright (c) 2002 James Morris <[email protected]>
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| 8 | * Copyright (c) 2005 Herbert Xu <[email protected]>
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| 9 |
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| 10 |
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| 11 | #include <crypto/algapi.h>
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| 12 | #include <linux/kernel.h>
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| 13 | #include <linux/crypto.h>
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| 14 | #include <linux/errno.h>
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| 15 | #include <linux/slab.h>
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| 16 | #include <linux/string.h>
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| 17 | #include "internal.h"
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| 18 |
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| 19 | static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
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| 20 | unsigned int keylen)
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| 21 | {
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| 22 | struct cipher_alg *cia = crypto_cipher_alg(tfm);
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| 23 | unsigned long alignmask = crypto_cipher_alignmask(tfm);
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| 24 | int ret;
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| 25 | u8 *buffer, *alignbuffer;
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| 26 | unsigned long absize;
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| 27 |
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| 28 | absize = keylen + alignmask;
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| 29 | buffer = kmalloc(absize, GFP_ATOMIC);
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| 30 | if (!buffer)
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| 31 | return -ENOMEM;
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| 32 |
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| 33 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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| 34 | memcpy(alignbuffer, key, keylen);
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| 35 | ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
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| 36 | memset(alignbuffer, 0, keylen);
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| 37 | kfree(buffer);
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| 38 | return ret;
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| 39 |
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| 40 | }
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| 41 |
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| 42 | int crypto_cipher_setkey(struct crypto_cipher *tfm,
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| 43 | const u8 *key, unsigned int keylen)
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| 44 | {
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| 45 | struct cipher_alg *cia = crypto_cipher_alg(tfm);
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| 46 | unsigned long alignmask = crypto_cipher_alignmask(tfm);
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| 47 |
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| 48 | if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize)
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| 49 | return -EINVAL;
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| 50 |
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| 51 | if ((unsigned long)key & alignmask)
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| 52 | return setkey_unaligned(tfm, key, keylen);
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| 53 |
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| 54 | return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
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| 55 | }
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| 56 | EXPORT_SYMBOL_GPL(crypto_cipher_setkey);
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| 57 |
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| 58 | static inline void cipher_crypt_one(struct crypto_cipher *tfm,
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| 59 | u8 *dst, const u8 *src, bool enc)
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| 60 | {
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| 61 | unsigned long alignmask = crypto_cipher_alignmask(tfm);
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| 62 | struct cipher_alg *cia = crypto_cipher_alg(tfm);
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| 63 | void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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| 64 | enc ? cia->cia_encrypt : cia->cia_decrypt;
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| 65 |
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| 66 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
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| 67 | unsigned int bs = crypto_cipher_blocksize(tfm);
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| 68 | u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
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| 69 | u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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| 70 |
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| 71 | memcpy(tmp, src, bs);
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| 72 | fn(crypto_cipher_tfm(tfm), tmp, tmp);
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| 73 | memcpy(dst, tmp, bs);
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| 74 | } else {
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| 75 | fn(crypto_cipher_tfm(tfm), dst, src);
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
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| 80 | u8 *dst, const u8 *src)
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| 81 | {
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| 82 | cipher_crypt_one(tfm, dst, src, true);
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| 83 | }
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| 84 | EXPORT_SYMBOL_GPL(crypto_cipher_encrypt_one);
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| 85 |
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| 86 | void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
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| 87 | u8 *dst, const u8 *src)
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| 88 | {
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| 89 | cipher_crypt_one(tfm, dst, src, false);
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| 90 | }
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| 91 | EXPORT_SYMBOL_GPL(crypto_cipher_decrypt_one);
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