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278 lines
6.9 KiB
C
278 lines
6.9 KiB
C
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/* $OpenBSD: bio_md.c,v 1.15 2018/05/02 15:51:41 tb Exp $ */
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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 <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 const BIO_METHOD methods_md = {
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.type = BIO_TYPE_MD,
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.name = "message digest",
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.bwrite = md_write,
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.bread = md_read,
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.bgets = md_gets,
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.ctrl = md_ctrl,
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.create = md_new,
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.destroy = md_free,
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.callback_ctrl = md_callback_ctrl
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};
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const BIO_METHOD *
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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
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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)
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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
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md_free(BIO *a)
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{
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if (a == NULL)
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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
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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)
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return (0);
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ctx = b->ptr;
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if ((ctx == NULL) || (b->next_bio == NULL))
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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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if (ret > 0) {
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if (EVP_DigestUpdate(ctx, (unsigned char *)out,
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(unsigned int)ret) <= 0)
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return (-1);
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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
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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))
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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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if (ret > 0) {
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if (!EVP_DigestUpdate(ctx, (const unsigned char *)in,
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(unsigned int)ret)) {
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BIO_clear_retry_flags(b);
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return 0;
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}
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}
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}
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if (b->next_bio != NULL) {
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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}
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return (ret);
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}
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static long
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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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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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ppmd = ptr;
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*ppmd = ctx->digest;
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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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b->init = 1;
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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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if (!EVP_MD_CTX_copy_ex(dctx, ctx))
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return 0;
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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
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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)
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return (0);
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switch (cmd) {
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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
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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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if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0)
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return -1;
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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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