/* crypto/evp/bio_md.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * 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 (tjh@cryptsoft.com). * * 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 (eay@cryptsoft.com)" * 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 (tjh@cryptsoft.com)" * * 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) { if (EVP_DigestUpdate(ctx,(unsigned char *)out, (unsigned int)ret)<=0) return (-1); } } 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); } } if(b->next_bio != NULL) { 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: pctx=ptr; *pctx=ctx; b->init = 1; 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); if (EVP_DigestFinal_ex(ctx,(unsigned char *)buf,&ret)<=0) return -1; return((int)ret); } /* static int md_puts(bp,str) BIO *bp; char *str; { return(-1); } */