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marcus.erl |
/*
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* Cryptographic Hash operations.
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
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u32 mask)
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{
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return alg->cra_ctxsize;
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}
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static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_tfm *tfm = crypto_hash_tfm(crt);
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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unsigned long alignmask = crypto_hash_alignmask(crt);
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int ret;
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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absize = keylen + alignmask;
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buffer = kmalloc(absize, GFP_ATOMIC);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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ret = alg->setkey(crt, alignbuffer, keylen);
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memset(alignbuffer, 0, keylen);
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kfree(buffer);
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return ret;
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}
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static int hash_setkey(struct crypto_hash *crt, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_tfm *tfm = crypto_hash_tfm(crt);
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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unsigned long alignmask = crypto_hash_alignmask(crt);
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if ((unsigned long)key & alignmask)
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return hash_setkey_unaligned(crt, key, keylen);
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return alg->setkey(crt, key, keylen);
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}
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static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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struct hash_tfm *crt = &tfm->crt_hash;
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struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
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if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
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return -EINVAL;
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crt->init = alg->init;
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crt->update = alg->update;
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crt->final = alg->final;
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crt->digest = alg->digest;
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crt->setkey = hash_setkey;
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crt->digestsize = alg->digestsize;
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return 0;
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}
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static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
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{
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seq_printf(m, "type : hash\n");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize);
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}
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const struct crypto_type crypto_hash_type = {
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.ctxsize = crypto_hash_ctxsize,
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.init = crypto_init_hash_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_hash_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_hash_type);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Generic cryptographic hash type");
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