159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
/*
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* Cryptographic API.
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*
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* Digest operations.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.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 <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/hardirq.h>
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#include <linux/highmem.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include "internal.h"
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#include "scatterwalk.h"
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static int init(struct hash_desc *desc)
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{
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struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
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tfm->__crt_alg->cra_digest.dia_init(tfm);
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return 0;
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}
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static int update2(struct hash_desc *desc,
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struct scatterlist *sg, unsigned int nbytes)
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{
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struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
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unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
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if (!nbytes)
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return 0;
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for (;;) {
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struct page *pg = sg_page(sg);
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unsigned int offset = sg->offset;
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unsigned int l = sg->length;
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if (unlikely(l > nbytes))
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l = nbytes;
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nbytes -= l;
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do {
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unsigned int bytes_from_page = min(l, ((unsigned int)
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(PAGE_SIZE)) -
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offset);
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char *src = crypto_kmap(pg, 0);
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char *p = src + offset;
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if (unlikely(offset & alignmask)) {
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unsigned int bytes =
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alignmask + 1 - (offset & alignmask);
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bytes = min(bytes, bytes_from_page);
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tfm->__crt_alg->cra_digest.dia_update(tfm, p,
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bytes);
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p += bytes;
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bytes_from_page -= bytes;
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l -= bytes;
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}
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tfm->__crt_alg->cra_digest.dia_update(tfm, p,
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bytes_from_page);
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crypto_kunmap(src, 0);
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crypto_yield(desc->flags);
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offset = 0;
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pg++;
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l -= bytes_from_page;
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} while (l > 0);
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if (!nbytes)
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break;
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sg = scatterwalk_sg_next(sg);
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}
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return 0;
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}
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static int update(struct hash_desc *desc,
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struct scatterlist *sg, unsigned int nbytes)
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{
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if (WARN_ON_ONCE(in_irq()))
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return -EDEADLK;
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return update2(desc, sg, nbytes);
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}
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static int final(struct hash_desc *desc, u8 *out)
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{
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struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
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unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
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struct digest_alg *digest = &tfm->__crt_alg->cra_digest;
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if (unlikely((unsigned long)out & alignmask)) {
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unsigned long align = alignmask + 1;
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unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
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u8 *dst = (u8 *)ALIGN(addr, align) +
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ALIGN(tfm->__crt_alg->cra_ctxsize, align);
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digest->dia_final(tfm, dst);
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memcpy(out, dst, digest->dia_digestsize);
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} else
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digest->dia_final(tfm, out);
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return 0;
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}
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static int nosetkey(struct crypto_hash *tfm, const u8 *key, unsigned int keylen)
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{
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crypto_hash_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
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return -ENOSYS;
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}
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static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen)
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{
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struct crypto_tfm *tfm = crypto_hash_tfm(hash);
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crypto_hash_clear_flags(hash, CRYPTO_TFM_RES_MASK);
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return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen);
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}
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static int digest(struct hash_desc *desc,
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struct scatterlist *sg, unsigned int nbytes, u8 *out)
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{
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if (WARN_ON_ONCE(in_irq()))
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return -EDEADLK;
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init(desc);
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update2(desc, sg, nbytes);
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return final(desc, out);
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}
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int crypto_init_digest_ops(struct crypto_tfm *tfm)
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{
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struct hash_tfm *ops = &tfm->crt_hash;
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struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
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if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
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return -EINVAL;
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ops->init = init;
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ops->update = update;
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ops->final = final;
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ops->digest = digest;
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ops->setkey = dalg->dia_setkey ? setkey : nosetkey;
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ops->digestsize = dalg->dia_digestsize;
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return 0;
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}
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void crypto_exit_digest_ops(struct crypto_tfm *tfm)
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{
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}
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