mirror of
https://github.com/koverstreet/bcachefs-tools.git
synced 2025-02-09 00:00:04 +03:00
295 lines
7.4 KiB
C
295 lines
7.4 KiB
C
/*
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* Synchronous Cryptographic Hash operations.
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*
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* Copyright (c) 2008 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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*/
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#include <crypto/internal/hash.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include "internal.h"
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static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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return -ENOSYS;
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}
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static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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unsigned long absize;
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u8 *buffer, *alignbuffer;
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int err;
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absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
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buffer = kmalloc(absize, GFP_KERNEL);
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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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err = shash->setkey(tfm, alignbuffer, keylen);
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kzfree(buffer);
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return err;
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}
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int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if ((unsigned long)key & alignmask)
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return shash_setkey_unaligned(tfm, key, keylen);
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return shash->setkey(tfm, key, keylen);
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}
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static inline unsigned int shash_align_buffer_size(unsigned len,
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unsigned long mask)
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{
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typedef u8 __attribute__ ((aligned)) u8_aligned;
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return len + (mask & ~(__alignof__(u8_aligned) - 1));
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}
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static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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unsigned int unaligned_len = alignmask + 1 -
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((unsigned long)data & alignmask);
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u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
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__attribute__ ((aligned));
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u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
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int err;
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if (unaligned_len > len)
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unaligned_len = len;
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memcpy(buf, data, unaligned_len);
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err = shash->update(desc, buf, unaligned_len);
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memset(buf, 0, unaligned_len);
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return err ?:
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shash->update(desc, data + unaligned_len, len - unaligned_len);
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}
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int crypto_shash_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if ((unsigned long)data & alignmask)
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return shash_update_unaligned(desc, data, len);
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return shash->update(desc, data, len);
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}
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static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned int ds = crypto_shash_digestsize(tfm);
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u8 ubuf[shash_align_buffer_size(ds, alignmask)]
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__attribute__ ((aligned));
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u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
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int err;
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err = shash->final(desc, buf);
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if (err)
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goto out;
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memcpy(out, buf, ds);
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out:
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memset(buf, 0, ds);
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return err;
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}
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int crypto_shash_final(struct shash_desc *desc, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if ((unsigned long)out & alignmask)
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return shash_final_unaligned(desc, out);
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return shash->final(desc, out);
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}
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static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return crypto_shash_update(desc, data, len) ?:
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crypto_shash_final(desc, out);
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}
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int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if (((unsigned long)data | (unsigned long)out) & alignmask)
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return shash_finup_unaligned(desc, data, len, out);
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return shash->finup(desc, data, len, out);
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}
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static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return crypto_shash_init(desc) ?:
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crypto_shash_finup(desc, data, len, out);
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}
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int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if (((unsigned long)data | (unsigned long)out) & alignmask)
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return shash_digest_unaligned(desc, data, len, out);
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return shash->digest(desc, data, len, out);
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}
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static int shash_default_export(struct shash_desc *desc, void *out)
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{
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memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
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return 0;
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}
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static int shash_default_import(struct shash_desc *desc, const void *in)
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{
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memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
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return 0;
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}
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static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_shash *hash = __crypto_shash_cast(tfm);
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hash->descsize = crypto_shash_alg(hash)->descsize;
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return 0;
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}
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static const struct crypto_type crypto_shash_type = {
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.extsize = crypto_alg_extsize,
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.init_tfm = crypto_shash_init_tfm,
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_MASK,
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.type = CRYPTO_ALG_TYPE_SHASH,
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.tfmsize = offsetof(struct crypto_shash, base),
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};
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struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
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u32 mask)
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{
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return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
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}
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static int shash_prepare_alg(struct shash_alg *alg)
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{
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struct crypto_alg *base = &alg->base;
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if (alg->digestsize > PAGE_SIZE / 8 ||
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alg->descsize > PAGE_SIZE / 8 ||
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alg->statesize > PAGE_SIZE / 8)
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return -EINVAL;
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base->cra_type = &crypto_shash_type;
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base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
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base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
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if (!alg->finup)
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alg->finup = shash_finup_unaligned;
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if (!alg->digest)
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alg->digest = shash_digest_unaligned;
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if (!alg->export) {
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alg->export = shash_default_export;
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alg->import = shash_default_import;
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alg->statesize = alg->descsize;
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}
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if (!alg->setkey)
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alg->setkey = shash_no_setkey;
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return 0;
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}
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int crypto_register_shash(struct shash_alg *alg)
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{
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struct crypto_alg *base = &alg->base;
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int err;
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err = shash_prepare_alg(alg);
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if (err)
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return err;
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return crypto_register_alg(base);
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}
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int crypto_unregister_shash(struct shash_alg *alg)
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{
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return crypto_unregister_alg(&alg->base);
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}
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int crypto_register_shashes(struct shash_alg *algs, int count)
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{
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int i, ret;
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for (i = 0; i < count; i++) {
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ret = crypto_register_shash(&algs[i]);
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if (ret)
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goto err;
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}
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return 0;
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err:
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for (--i; i >= 0; --i)
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crypto_unregister_shash(&algs[i]);
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return ret;
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}
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int crypto_unregister_shashes(struct shash_alg *algs, int count)
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{
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int i, ret;
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for (i = count - 1; i >= 0; --i) {
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ret = crypto_unregister_shash(&algs[i]);
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if (ret)
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pr_err("Failed to unregister %s %s: %d\n",
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algs[i].base.cra_driver_name,
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algs[i].base.cra_name, ret);
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}
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return 0;
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}
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Synchronous cryptographic hash type");
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