1 /* crypto/evp/bio_md.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
62 #include <openssl/buffer.h>
63 #include <openssl/evp.h>
65 /* BIO_put and BIO_get both add to the digest,
66 * BIO_gets returns the digest */
68 static int md_write(BIO *h, char const *buf, int num);
69 static int md_read(BIO *h, char *buf, int size);
70 /*static int md_puts(BIO *h, const char *str); */
71 static int md_gets(BIO *h, char *str, int size);
72 static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
73 static int md_new(BIO *h);
74 static int md_free(BIO *data);
75 static long md_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
77 static BIO_METHOD methods_md=
79 BIO_TYPE_MD,"message digest",
90 BIO_METHOD *BIO_f_md(void)
95 static int md_new(BIO *bi)
99 ctx=(EVP_MD_CTX *)OPENSSL_malloc(sizeof(EVP_MD_CTX));
100 if (ctx == NULL) return(0);
108 static int md_free(BIO *a)
110 if (a == NULL) return(0);
111 OPENSSL_free(a->ptr);
118 static int md_read(BIO *b, char *out, int outl)
123 if (out == NULL) return(0);
124 ctx=(EVP_MD_CTX *)b->ptr;
126 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
128 ret=BIO_read(b->next_bio,out,outl);
133 EVP_DigestUpdate(ctx,(unsigned char *)out,
137 BIO_clear_retry_flags(b);
138 BIO_copy_next_retry(b);
142 static int md_write(BIO *b, const char *in, int inl)
147 if ((in == NULL) || (inl <= 0)) return(0);
148 ctx=(EVP_MD_CTX *)b->ptr;
150 if ((ctx != NULL) && (b->next_bio != NULL))
151 ret=BIO_write(b->next_bio,in,inl);
156 EVP_DigestUpdate(ctx,(unsigned char *)in,
160 BIO_clear_retry_flags(b);
161 BIO_copy_next_retry(b);
165 static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
167 EVP_MD_CTX *ctx,*dctx,**pctx;
173 ctx=(EVP_MD_CTX *)b->ptr;
179 EVP_DigestInit(ctx,ctx->digest);
182 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
187 ppmd=(const EVP_MD **)ptr;
193 case BIO_C_GET_MD_CTX:
196 pctx=(EVP_MD_CTX **)ptr;
202 case BIO_C_DO_STATE_MACHINE:
203 BIO_clear_retry_flags(b);
204 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
205 BIO_copy_next_retry(b);
210 EVP_DigestInit(ctx,md);
215 dctx=(EVP_MD_CTX *)dbio->ptr;
216 memcpy(dctx,ctx,sizeof(ctx));
220 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
226 static long md_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
230 if (b->next_bio == NULL) return(0);
234 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
240 static int md_gets(BIO *bp, char *buf, int size)
246 ctx=(EVP_MD_CTX *)bp->ptr;
247 if (size < ctx->digest->md_size)
249 EVP_DigestFinal(ctx,(unsigned char *)buf,&ret);
254 static int md_puts(bp,str)