Subversion Repositories or1k

/*

 * Cryptographic API.

 *

 * Digest operations.

 *

 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the Free

 * Software Foundation; either version 2 of the License, or (at your option)

 * any later version.

 *

 */

#include <linux/crypto.h>

#include <linux/mm.h>

#include <linux/errno.h>

#include <linux/highmem.h>

#include <asm/scatterlist.h>

#include "internal.h"

static void init(struct crypto_tfm *tfm)

{

        tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));

}

static void update(struct crypto_tfm *tfm,

                   struct scatterlist *sg, unsigned int nsg)

{

        unsigned int i;

        for (i = 0; i < nsg; i++) {

                char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;

                tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),

                                                      p, sg[i].length);

                crypto_kunmap(p, 0);

                crypto_yield(tfm);

        }

}

static void final(struct crypto_tfm *tfm, u8 *out)

{

        tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);

}

static void digest(struct crypto_tfm *tfm,

                   struct scatterlist *sg, unsigned int nsg, u8 *out)

{

        unsigned int i;

        tfm->crt_digest.dit_init(tfm);

        for (i = 0; i < nsg; i++) {

                char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;

                tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),

                                                      p, sg[i].length);

                crypto_kunmap(p, 0);

                crypto_yield(tfm);

        }

        crypto_digest_final(tfm, out);

}

int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)

{

        return flags ? -EINVAL : 0;

}

int crypto_init_digest_ops(struct crypto_tfm *tfm)

{

        struct digest_tfm *ops = &tfm->crt_digest;

        ops->dit_init   = init;

        ops->dit_update = update;

        ops->dit_final  = final;

        ops->dit_digest = digest;

        return crypto_alloc_hmac_block(tfm);

}

void crypto_exit_digest_ops(struct crypto_tfm *tfm)

{

        crypto_free_hmac_block(tfm);

}