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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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20036252fc
This patch adds the walking helpers for hash algorithms akin to those of block ciphers. This is a necessary step before we can reimplement existing hash algorithms using the new ahash interface. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
195 lines
4.7 KiB
C
195 lines
4.7 KiB
C
/*
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* Asynchronous Cryptographic Hash operations.
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*
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* This is the asynchronous version of hash.c with notification of
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* completion via a callback.
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*
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* Copyright (c) 2008 Loc Ho <lho@amcc.com>
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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 <crypto/scatterwalk.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/sched.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 int hash_walk_next(struct crypto_hash_walk *walk)
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{
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unsigned int alignmask = walk->alignmask;
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unsigned int offset = walk->offset;
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unsigned int nbytes = min(walk->entrylen,
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((unsigned int)(PAGE_SIZE)) - offset);
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walk->data = crypto_kmap(walk->pg, 0);
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walk->data += offset;
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if (offset & alignmask)
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nbytes = alignmask + 1 - (offset & alignmask);
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walk->entrylen -= nbytes;
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return nbytes;
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}
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static int hash_walk_new_entry(struct crypto_hash_walk *walk)
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{
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struct scatterlist *sg;
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sg = walk->sg;
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walk->pg = sg_page(sg);
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walk->offset = sg->offset;
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walk->entrylen = sg->length;
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if (walk->entrylen > walk->total)
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walk->entrylen = walk->total;
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walk->total -= walk->entrylen;
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return hash_walk_next(walk);
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}
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int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
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{
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unsigned int alignmask = walk->alignmask;
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unsigned int nbytes = walk->entrylen;
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walk->data -= walk->offset;
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if (nbytes && walk->offset & alignmask && !err) {
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walk->offset += alignmask - 1;
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walk->offset = ALIGN(walk->offset, alignmask + 1);
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walk->data += walk->offset;
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nbytes = min(nbytes,
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((unsigned int)(PAGE_SIZE)) - walk->offset);
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walk->entrylen -= nbytes;
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return nbytes;
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}
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crypto_kunmap(walk->data, 0);
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crypto_yield(walk->flags);
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if (err)
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return err;
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walk->offset = 0;
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if (nbytes)
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return hash_walk_next(walk);
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if (!walk->total)
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return 0;
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walk->sg = scatterwalk_sg_next(walk->sg);
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return hash_walk_new_entry(walk);
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}
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EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
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int crypto_hash_walk_first(struct ahash_request *req,
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struct crypto_hash_walk *walk)
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{
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walk->total = req->nbytes;
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if (!walk->total)
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return 0;
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walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
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walk->sg = req->src;
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walk->flags = req->base.flags;
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return hash_walk_new_entry(walk);
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}
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EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
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static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ahash_alg *ahash = crypto_ahash_alg(tfm);
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unsigned long alignmask = crypto_ahash_alignmask(tfm);
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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 = ahash->setkey(tfm, 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 ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ahash_alg *ahash = crypto_ahash_alg(tfm);
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unsigned long alignmask = crypto_ahash_alignmask(tfm);
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if ((unsigned long)key & alignmask)
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return ahash_setkey_unaligned(tfm, key, keylen);
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return ahash->setkey(tfm, key, keylen);
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}
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static unsigned int crypto_ahash_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 crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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{
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struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash;
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struct ahash_tfm *crt = &tfm->crt_ahash;
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if (alg->digestsize > PAGE_SIZE / 8)
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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 = ahash_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_ahash_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
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{
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seq_printf(m, "type : ahash\n");
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seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"yes" : "no");
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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_ahash_type = {
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.ctxsize = crypto_ahash_ctxsize,
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.init = crypto_init_ahash_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_ahash_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_ahash_type);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
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