d0edffc7da
Non FIPS algorithms are not normally allowed in FIPS mode. Any attempt to use them via high level functions will return an error. The low level non-FIPS algorithm functions cannot return errors so they produce assertion failures. HMAC also has to give an assertion error because it (erroneously) can't return an error either. There are exceptions (such as MD5 in TLS and non cryptographic use of algorithms) and applications can override the blocking and use non FIPS algorithms anyway. For low level functions the override is perfomed by prefixing the algorithm initalization function with "private_" for example private_MD5_Init(). For high level functions an override is performed by setting a flag in the context.
264 lines
6.5 KiB
C
264 lines
6.5 KiB
C
/* crypto/evp/bio_md.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "cryptlib.h"
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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/* BIO_put and BIO_get both add to the digest,
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* BIO_gets returns the digest */
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static int md_write(BIO *h, char const *buf, int num);
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static int md_read(BIO *h, char *buf, int size);
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/*static int md_puts(BIO *h, const char *str); */
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static int md_gets(BIO *h, char *str, int size);
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static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int md_new(BIO *h);
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static int md_free(BIO *data);
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static long md_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
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static BIO_METHOD methods_md=
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{
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BIO_TYPE_MD,"message digest",
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md_write,
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md_read,
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NULL, /* md_puts, */
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md_gets,
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md_ctrl,
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md_new,
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md_free,
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md_callback_ctrl,
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};
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BIO_METHOD *BIO_f_md(void)
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{
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return(&methods_md);
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}
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static int md_new(BIO *bi)
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{
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EVP_MD_CTX *ctx;
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ctx=EVP_MD_CTX_create();
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if (ctx == NULL) return(0);
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bi->init=0;
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bi->ptr=(char *)ctx;
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bi->flags=0;
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return(1);
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}
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static int md_free(BIO *a)
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{
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if (a == NULL) return(0);
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EVP_MD_CTX_destroy(a->ptr);
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a->ptr=NULL;
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a->init=0;
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a->flags=0;
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return(1);
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}
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static int md_read(BIO *b, char *out, int outl)
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{
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int ret=0;
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EVP_MD_CTX *ctx;
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if (out == NULL) return(0);
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ctx=b->ptr;
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if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
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ret=BIO_read(b->next_bio,out,outl);
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if (b->init)
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{
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if (ret > 0)
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{
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EVP_DigestUpdate(ctx,(unsigned char *)out,
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(unsigned int)ret);
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}
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}
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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return(ret);
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}
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static int md_write(BIO *b, const char *in, int inl)
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{
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int ret=0;
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EVP_MD_CTX *ctx;
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if ((in == NULL) || (inl <= 0)) return(0);
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ctx=b->ptr;
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if ((ctx != NULL) && (b->next_bio != NULL))
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ret=BIO_write(b->next_bio,in,inl);
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if (b->init)
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{
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if (ret > 0)
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{
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EVP_DigestUpdate(ctx,(unsigned char *)in,
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(unsigned int)ret);
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}
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}
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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return(ret);
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}
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static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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EVP_MD_CTX *ctx,*dctx,**pctx;
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const EVP_MD **ppmd;
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EVP_MD *md;
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long ret=1;
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BIO *dbio;
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ctx=b->ptr;
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switch (cmd)
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{
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case BIO_CTRL_RESET:
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if (b->init)
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ret = EVP_DigestInit_ex(ctx,ctx->digest, NULL);
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else
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ret=0;
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if (ret > 0)
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ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
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break;
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case BIO_C_GET_MD:
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if (b->init)
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{
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ppmd=ptr;
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*ppmd=ctx->digest;
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}
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else
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ret=0;
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break;
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case BIO_C_GET_MD_CTX:
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pctx=ptr;
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*pctx=ctx;
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break;
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case BIO_C_SET_MD_CTX:
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if (b->init)
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b->ptr=ptr;
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else
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ret=0;
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break;
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case BIO_C_DO_STATE_MACHINE:
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BIO_clear_retry_flags(b);
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ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
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BIO_copy_next_retry(b);
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break;
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case BIO_C_SET_MD:
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md=ptr;
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ret = EVP_DigestInit_ex(ctx,md, NULL);
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if (ret > 0)
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b->init=1;
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break;
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case BIO_CTRL_DUP:
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dbio=ptr;
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dctx=dbio->ptr;
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EVP_MD_CTX_copy_ex(dctx,ctx);
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b->init=1;
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break;
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default:
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ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
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break;
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}
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return(ret);
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}
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static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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{
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long ret=1;
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if (b->next_bio == NULL) return(0);
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switch (cmd)
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{
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default:
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ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
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break;
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}
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return(ret);
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}
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static int md_gets(BIO *bp, char *buf, int size)
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{
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EVP_MD_CTX *ctx;
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unsigned int ret;
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ctx=bp->ptr;
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if (size < ctx->digest->md_size)
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return(0);
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EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret);
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return((int)ret);
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}
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/*
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static int md_puts(bp,str)
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BIO *bp;
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char *str;
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{
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return(-1);
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}
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*/
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