digest.c

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    1 /*
    2  * Cryptographic API.
    3  *
    4  * Digest operations.
    5  *
    6  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
    7  *
    8  * This program is free software; you can redistribute it and/or modify it
    9  * under the terms of the GNU General Public License as published by the Free
   10  * Software Foundation; either version 2 of the License, or (at your option) 
   11  * any later version.
   12  *
   13  */
   14 #include <linux/crypto.h>
   15 #include <linux/mm.h>
   16 #include <linux/errno.h>
   17 #include <linux/highmem.h>
   18 #include <asm/scatterlist.h>
   19 #include "internal.h"
   20 
   21 static void init(struct crypto_tfm *tfm)
   22 {
   23         tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));
   24 }
   25 
   26 static void update(struct crypto_tfm *tfm,
   27                    struct scatterlist *sg, unsigned int nsg)
   28 {
   29         unsigned int i;
   30         
   31         for (i = 0; i < nsg; i++) {
   32                 char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
   33                 tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
   34                                                       p, sg[i].length);
   35                 crypto_kunmap(p, 0);
   36                 crypto_yield(tfm);
   37         }
   38 }
   39 
   40 static void final(struct crypto_tfm *tfm, u8 *out)
   41 {
   42         tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
   43 }
   44 
   45 static void digest(struct crypto_tfm *tfm,
   46                    struct scatterlist *sg, unsigned int nsg, u8 *out)
   47 {
   48         unsigned int i;
   49 
   50         tfm->crt_digest.dit_init(tfm);
   51                 
   52         for (i = 0; i < nsg; i++) {
   53                 char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
   54                 tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
   55                                                       p, sg[i].length);
   56                 crypto_kunmap(p, 0);
   57                 crypto_yield(tfm);
   58         }
   59         crypto_digest_final(tfm, out);
   60 }
   61 
   62 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
   63 {
   64         return flags ? -EINVAL : 0;
   65 }
   66 
   67 int crypto_init_digest_ops(struct crypto_tfm *tfm)
   68 {
   69         struct digest_tfm *ops = &tfm->crt_digest;
   70         
   71         ops->dit_init   = init;
   72         ops->dit_update = update;
   73         ops->dit_final  = final;
   74         ops->dit_digest = digest;
   75         
   76         return crypto_alloc_hmac_block(tfm);
   77 }
   78 
   79 void crypto_exit_digest_ops(struct crypto_tfm *tfm)
   80 {
   81         crypto_free_hmac_block(tfm);
   82 }

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FreeBSD/Linux Kernel Cross Reference sys/crypto/digest.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/digest.c