ref: dc96f164a2b72ccb209ae98ce50a11087cbe44f8
dir: /sys/src/ape/lib/openssl/crypto/evp/bio_md.c/
/* crypto/evp/bio_md.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young ([email protected]).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson ([email protected]).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young ([email protected])"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson ([email protected])"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include <errno.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/evp.h>
/* BIO_put and BIO_get both add to the digest,
* BIO_gets returns the digest */
static int md_write(BIO *h, char const *buf, int num);
static int md_read(BIO *h, char *buf, int size);
/*static int md_puts(BIO *h, const char *str); */
static int md_gets(BIO *h, char *str, int size);
static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int md_new(BIO *h);
static int md_free(BIO *data);
static long md_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
static BIO_METHOD methods_md=
{
BIO_TYPE_MD,"message digest",
md_write,
md_read,
NULL, /* md_puts, */
md_gets,
md_ctrl,
md_new,
md_free,
md_callback_ctrl,
};
BIO_METHOD *BIO_f_md(void)
{
return(&methods_md);
}
static int md_new(BIO *bi)
{
EVP_MD_CTX *ctx;
ctx=EVP_MD_CTX_create();
if (ctx == NULL) return(0);
bi->init=0;
bi->ptr=(char *)ctx;
bi->flags=0;
return(1);
}
static int md_free(BIO *a)
{
if (a == NULL) return(0);
EVP_MD_CTX_destroy(a->ptr);
a->ptr=NULL;
a->init=0;
a->flags=0;
return(1);
}
static int md_read(BIO *b, char *out, int outl)
{
int ret=0;
EVP_MD_CTX *ctx;
if (out == NULL) return(0);
ctx=b->ptr;
if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
ret=BIO_read(b->next_bio,out,outl);
if (b->init)
{
if (ret > 0)
{
EVP_DigestUpdate(ctx,(unsigned char *)out,
(unsigned int)ret);
}
}
BIO_clear_retry_flags(b);
BIO_copy_next_retry(b);
return(ret);
}
static int md_write(BIO *b, const char *in, int inl)
{
int ret=0;
EVP_MD_CTX *ctx;
if ((in == NULL) || (inl <= 0)) return(0);
ctx=b->ptr;
if ((ctx != NULL) && (b->next_bio != NULL))
ret=BIO_write(b->next_bio,in,inl);
if (b->init)
{
if (ret > 0)
{
EVP_DigestUpdate(ctx,(const unsigned char *)in,
(unsigned int)ret);
}
}
BIO_clear_retry_flags(b);
BIO_copy_next_retry(b);
return(ret);
}
static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
{
EVP_MD_CTX *ctx,*dctx,**pctx;
const EVP_MD **ppmd;
EVP_MD *md;
long ret=1;
BIO *dbio;
ctx=b->ptr;
switch (cmd)
{
case BIO_CTRL_RESET:
if (b->init)
ret = EVP_DigestInit_ex(ctx,ctx->digest, NULL);
else
ret=0;
if (ret > 0)
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
case BIO_C_GET_MD:
if (b->init)
{
ppmd=ptr;
*ppmd=ctx->digest;
}
else
ret=0;
break;
case BIO_C_GET_MD_CTX:
if (b->init)
{
pctx=ptr;
*pctx=ctx;
}
else
ret=0;
break;
case BIO_C_SET_MD_CTX:
if (b->init)
b->ptr=ptr;
else
ret=0;
break;
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
BIO_copy_next_retry(b);
break;
case BIO_C_SET_MD:
md=ptr;
ret = EVP_DigestInit_ex(ctx,md, NULL);
if (ret > 0)
b->init=1;
break;
case BIO_CTRL_DUP:
dbio=ptr;
dctx=dbio->ptr;
EVP_MD_CTX_copy_ex(dctx,ctx);
b->init=1;
break;
default:
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
}
return(ret);
}
static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
{
long ret=1;
if (b->next_bio == NULL) return(0);
switch (cmd)
{
default:
ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
break;
}
return(ret);
}
static int md_gets(BIO *bp, char *buf, int size)
{
EVP_MD_CTX *ctx;
unsigned int ret;
ctx=bp->ptr;
if (size < ctx->digest->md_size)
return(0);
EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret);
return((int)ret);
}
/*
static int md_puts(bp,str)
BIO *bp;
char *str;
{
return(-1);
}
*/