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/*
*****************************************************************************
*
* File: fko_digest.c
*
* Author: Damien S. Stuart
*
* Purpose: Create the base64-encoded digest for the current spa data. The
* digest used is determined by the digest_type setting in the
* fko context.
*
* Copyright 2009-2010 Damien Stuart (dstuart@dstuart.org)
*
* License (GNU Public License):
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*****************************************************************************
*/
#include "fko_common.h"
#include "fko.h"
#include "digest.h"
/* Set the SPA digest type.
*/
static int
set_spa_digest_type(fko_ctx_t ctx,
short *digest_type_field, const short digest_type)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return(FKO_ERROR_CTX_NOT_INITIALIZED);
if(digest_type < 1 || digest_type >= FKO_LAST_DIGEST_TYPE)
return(FKO_ERROR_INVALID_DATA);
*digest_type_field = digest_type;
ctx->state |= FKO_DIGEST_TYPE_MODIFIED;
return(FKO_SUCCESS);
}
int
fko_set_spa_digest_type(fko_ctx_t ctx, const short digest_type)
{
return set_spa_digest_type(ctx, &ctx->digest_type, digest_type);
}
int
fko_set_raw_spa_digest_type(fko_ctx_t ctx, const short raw_digest_type)
{
return set_spa_digest_type(ctx, &ctx->raw_digest_type, raw_digest_type);
}
/* Return the SPA digest type.
*/
int
fko_get_spa_digest_type(fko_ctx_t ctx, short *digest_type)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return(FKO_ERROR_CTX_NOT_INITIALIZED);
*digest_type = ctx->digest_type;
return(FKO_SUCCESS);
}
/* Return the SPA digest type.
*/
int
fko_get_raw_spa_digest_type(fko_ctx_t ctx, short *raw_digest_type)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return(FKO_ERROR_CTX_NOT_INITIALIZED);
*raw_digest_type = ctx->raw_digest_type;
return(FKO_SUCCESS);
}
static int
set_digest(char *data, char **digest, short digest_type)
{
char *md = NULL;
switch(digest_type)
{
case FKO_DIGEST_MD5:
md = malloc(MD_HEX_SIZE(MD5_DIGEST_LENGTH)+1);
if(md == NULL)
return(FKO_ERROR_MEMORY_ALLOCATION);
md5_base64(md,
(unsigned char*)data, strlen(data));
break;
case FKO_DIGEST_SHA1:
md = malloc(MD_HEX_SIZE(SHA1_DIGEST_LENGTH)+1);
if(md == NULL)
return(FKO_ERROR_MEMORY_ALLOCATION);
sha1_base64(md,
(unsigned char*)data, strlen(data));
break;
case FKO_DIGEST_SHA256:
md = malloc(MD_HEX_SIZE(SHA256_DIGEST_LENGTH)+1);
if(md == NULL)
return(FKO_ERROR_MEMORY_ALLOCATION);
sha256_base64(md,
(unsigned char*)data, strlen(data));
break;
case FKO_DIGEST_SHA384:
md = malloc(MD_HEX_SIZE(SHA384_DIGEST_LENGTH)+1);
if(md == NULL)
return(FKO_ERROR_MEMORY_ALLOCATION);
sha384_base64(md,
(unsigned char*)data, strlen(data));
break;
case FKO_DIGEST_SHA512:
md = malloc(MD_HEX_SIZE(SHA512_DIGEST_LENGTH)+1);
if(md == NULL)
return(FKO_ERROR_MEMORY_ALLOCATION);
sha512_base64(md,
(unsigned char*)data, strlen(data));
break;
default:
return(FKO_ERROR_INVALID_DIGEST_TYPE);
}
/* Just in case this is a subsquent call to this function. We
* do not want to be leaking memory.
*/
if(*digest != NULL)
free(*digest);
*digest = md;
return(FKO_SUCCESS);
}
int
fko_set_spa_digest(fko_ctx_t ctx)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return(FKO_ERROR_CTX_NOT_INITIALIZED);
/* Must have encoded message data to start with.
*/
if(ctx->encoded_msg == NULL)
return(FKO_ERROR_MISSING_ENCODED_DATA);
return set_digest(ctx->encoded_msg,
&ctx->digest, ctx->digest_type);
}
int
fko_set_raw_spa_digest(fko_ctx_t ctx)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return(FKO_ERROR_CTX_NOT_INITIALIZED);
/* Must have encoded message data to start with.
*/
if(ctx->encrypted_msg == NULL)
return(FKO_ERROR_MISSING_ENCODED_DATA);
return set_digest(ctx->encrypted_msg,
&ctx->raw_digest, ctx->raw_digest_type);
}
int
fko_get_spa_digest(fko_ctx_t ctx, char **md)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return(FKO_ERROR_CTX_NOT_INITIALIZED);
*md = ctx->digest;
return(FKO_SUCCESS);
}
int
fko_get_raw_spa_digest(fko_ctx_t ctx, char **md)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return(FKO_ERROR_CTX_NOT_INITIALIZED);
*md = ctx->raw_digest;
return(FKO_SUCCESS);
}
/***EOF***/
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