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129.\" ========================================================================
130.\"
131.IX Title "BIO_f_md 3"
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124.\" ========================================================================
125.\"
126.IX Title "BIO_f_md 3"
|
132.TH BIO_f_md 3 "2010-03-24" "0.9.8n" "OpenSSL"
| 127.TH BIO_f_md 3 "2010-11-16" "0.9.8p" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
|
133.SH "NAME"
134BIO_f_md, BIO_set_md, BIO_get_md, BIO_get_md_ctx \- message digest BIO filter
135.SH "SYNOPSIS"
136.IX Header "SYNOPSIS"
137.Vb 2
138\& #include <openssl/bio.h>
139\& #include <openssl/evp.h>
| 132.SH "NAME"
133BIO_f_md, BIO_set_md, BIO_get_md, BIO_get_md_ctx \- message digest BIO filter
134.SH "SYNOPSIS"
135.IX Header "SYNOPSIS"
136.Vb 2
137\& #include <openssl/bio.h>
138\& #include <openssl/evp.h>
|
140.Ve
141.PP
142.Vb 4
| 139\&
|
143\& BIO_METHOD * BIO_f_md(void);
144\& int BIO_set_md(BIO *b,EVP_MD *md);
145\& int BIO_get_md(BIO *b,EVP_MD **mdp);
146\& int BIO_get_md_ctx(BIO *b,EVP_MD_CTX **mdcp);
147.Ve
148.SH "DESCRIPTION"
149.IX Header "DESCRIPTION"
150\&\fIBIO_f_md()\fR returns the message digest \s-1BIO\s0 method. This is a filter
151\&\s-1BIO\s0 that digests any data passed through it, it is a \s-1BIO\s0 wrapper
152for the digest routines \fIEVP_DigestInit()\fR, \fIEVP_DigestUpdate()\fR
153and \fIEVP_DigestFinal()\fR.
154.PP
155Any data written or read through a digest \s-1BIO\s0 using \fIBIO_read()\fR and
156\&\fIBIO_write()\fR is digested.
157.PP
158\&\fIBIO_gets()\fR, if its \fBsize\fR parameter is large enough finishes the
159digest calculation and returns the digest value. \fIBIO_puts()\fR is
160not supported.
161.PP
162\&\fIBIO_reset()\fR reinitialises a digest \s-1BIO\s0.
163.PP
164\&\fIBIO_set_md()\fR sets the message digest of \s-1BIO\s0 \fBb\fR to \fBmd\fR: this
165must be called to initialize a digest \s-1BIO\s0 before any data is
166passed through it. It is a \fIBIO_ctrl()\fR macro.
167.PP
168\&\fIBIO_get_md()\fR places the a pointer to the digest BIOs digest method
169in \fBmdp\fR, it is a \fIBIO_ctrl()\fR macro.
170.PP
171\&\fIBIO_get_md_ctx()\fR returns the digest BIOs context into \fBmdcp\fR.
172.SH "NOTES"
173.IX Header "NOTES"
174The context returned by \fIBIO_get_md_ctx()\fR can be used in calls
175to \fIEVP_DigestFinal()\fR and also the signature routines \fIEVP_SignFinal()\fR
176and \fIEVP_VerifyFinal()\fR.
177.PP
178The context returned by \fIBIO_get_md_ctx()\fR is an internal context
179structure. Changes made to this context will affect the digest
180\&\s-1BIO\s0 itself and the context pointer will become invalid when the digest
181\&\s-1BIO\s0 is freed.
182.PP
183After the digest has been retrieved from a digest \s-1BIO\s0 it must be
184reinitialized by calling \fIBIO_reset()\fR, or \fIBIO_set_md()\fR before any more
185data is passed through it.
186.PP
187If an application needs to call \fIBIO_gets()\fR or \fIBIO_puts()\fR through
188a chain containing digest BIOs then this can be done by prepending
189a buffering \s-1BIO\s0.
190.SH "RETURN VALUES"
191.IX Header "RETURN VALUES"
192\&\fIBIO_f_md()\fR returns the digest \s-1BIO\s0 method.
193.PP
194\&\fIBIO_set_md()\fR, \fIBIO_get_md()\fR and \fIBIO_md_ctx()\fR return 1 for success and
1950 for failure.
196.SH "EXAMPLES"
197.IX Header "EXAMPLES"
198The following example creates a \s-1BIO\s0 chain containing an \s-1SHA1\s0 and \s-1MD5\s0
199digest \s-1BIO\s0 and passes the string \*(L"Hello World\*(R" through it. Error
200checking has been omitted for clarity.
201.PP
| 140\& BIO_METHOD * BIO_f_md(void);
141\& int BIO_set_md(BIO *b,EVP_MD *md);
142\& int BIO_get_md(BIO *b,EVP_MD **mdp);
143\& int BIO_get_md_ctx(BIO *b,EVP_MD_CTX **mdcp);
144.Ve
145.SH "DESCRIPTION"
146.IX Header "DESCRIPTION"
147\&\fIBIO_f_md()\fR returns the message digest \s-1BIO\s0 method. This is a filter
148\&\s-1BIO\s0 that digests any data passed through it, it is a \s-1BIO\s0 wrapper
149for the digest routines \fIEVP_DigestInit()\fR, \fIEVP_DigestUpdate()\fR
150and \fIEVP_DigestFinal()\fR.
151.PP
152Any data written or read through a digest \s-1BIO\s0 using \fIBIO_read()\fR and
153\&\fIBIO_write()\fR is digested.
154.PP
155\&\fIBIO_gets()\fR, if its \fBsize\fR parameter is large enough finishes the
156digest calculation and returns the digest value. \fIBIO_puts()\fR is
157not supported.
158.PP
159\&\fIBIO_reset()\fR reinitialises a digest \s-1BIO\s0.
160.PP
161\&\fIBIO_set_md()\fR sets the message digest of \s-1BIO\s0 \fBb\fR to \fBmd\fR: this
162must be called to initialize a digest \s-1BIO\s0 before any data is
163passed through it. It is a \fIBIO_ctrl()\fR macro.
164.PP
165\&\fIBIO_get_md()\fR places the a pointer to the digest BIOs digest method
166in \fBmdp\fR, it is a \fIBIO_ctrl()\fR macro.
167.PP
168\&\fIBIO_get_md_ctx()\fR returns the digest BIOs context into \fBmdcp\fR.
169.SH "NOTES"
170.IX Header "NOTES"
171The context returned by \fIBIO_get_md_ctx()\fR can be used in calls
172to \fIEVP_DigestFinal()\fR and also the signature routines \fIEVP_SignFinal()\fR
173and \fIEVP_VerifyFinal()\fR.
174.PP
175The context returned by \fIBIO_get_md_ctx()\fR is an internal context
176structure. Changes made to this context will affect the digest
177\&\s-1BIO\s0 itself and the context pointer will become invalid when the digest
178\&\s-1BIO\s0 is freed.
179.PP
180After the digest has been retrieved from a digest \s-1BIO\s0 it must be
181reinitialized by calling \fIBIO_reset()\fR, or \fIBIO_set_md()\fR before any more
182data is passed through it.
183.PP
184If an application needs to call \fIBIO_gets()\fR or \fIBIO_puts()\fR through
185a chain containing digest BIOs then this can be done by prepending
186a buffering \s-1BIO\s0.
187.SH "RETURN VALUES"
188.IX Header "RETURN VALUES"
189\&\fIBIO_f_md()\fR returns the digest \s-1BIO\s0 method.
190.PP
191\&\fIBIO_set_md()\fR, \fIBIO_get_md()\fR and \fIBIO_md_ctx()\fR return 1 for success and
1920 for failure.
193.SH "EXAMPLES"
194.IX Header "EXAMPLES"
195The following example creates a \s-1BIO\s0 chain containing an \s-1SHA1\s0 and \s-1MD5\s0
196digest \s-1BIO\s0 and passes the string \*(L"Hello World\*(R" through it. Error
197checking has been omitted for clarity.
198.PP
|
202.Vb 14
| 199.Vb 10
|
203\& BIO *bio, *mdtmp;
204\& char message[] = "Hello World";
205\& bio = BIO_new(BIO_s_null());
206\& mdtmp = BIO_new(BIO_f_md());
207\& BIO_set_md(mdtmp, EVP_sha1());
208\& /* For BIO_push() we want to append the sink BIO and keep a note of
209\& * the start of the chain.
210\& */
211\& bio = BIO_push(mdtmp, bio);
212\& mdtmp = BIO_new(BIO_f_md());
213\& BIO_set_md(mdtmp, EVP_md5());
214\& bio = BIO_push(mdtmp, bio);
215\& /* Note: mdtmp can now be discarded */
216\& BIO_write(bio, message, strlen(message));
217.Ve
218.PP
219The next example digests data by reading through a chain instead:
220.PP
| 200\& BIO *bio, *mdtmp;
201\& char message[] = "Hello World";
202\& bio = BIO_new(BIO_s_null());
203\& mdtmp = BIO_new(BIO_f_md());
204\& BIO_set_md(mdtmp, EVP_sha1());
205\& /* For BIO_push() we want to append the sink BIO and keep a note of
206\& * the start of the chain.
207\& */
208\& bio = BIO_push(mdtmp, bio);
209\& mdtmp = BIO_new(BIO_f_md());
210\& BIO_set_md(mdtmp, EVP_md5());
211\& bio = BIO_push(mdtmp, bio);
212\& /* Note: mdtmp can now be discarded */
213\& BIO_write(bio, message, strlen(message));
214.Ve
215.PP
216The next example digests data by reading through a chain instead:
217.PP
|
221.Vb 14
| 218.Vb 10
|
222\& BIO *bio, *mdtmp;
223\& char buf[1024];
224\& int rdlen;
225\& bio = BIO_new_file(file, "rb");
226\& mdtmp = BIO_new(BIO_f_md());
227\& BIO_set_md(mdtmp, EVP_sha1());
228\& bio = BIO_push(mdtmp, bio);
229\& mdtmp = BIO_new(BIO_f_md());
230\& BIO_set_md(mdtmp, EVP_md5());
231\& bio = BIO_push(mdtmp, bio);
232\& do {
233\& rdlen = BIO_read(bio, buf, sizeof(buf));
234\& /* Might want to do something with the data here */
235\& } while(rdlen > 0);
236.Ve
237.PP
238This next example retrieves the message digests from a \s-1BIO\s0 chain and
239outputs them. This could be used with the examples above.
240.PP
| 219\& BIO *bio, *mdtmp;
220\& char buf[1024];
221\& int rdlen;
222\& bio = BIO_new_file(file, "rb");
223\& mdtmp = BIO_new(BIO_f_md());
224\& BIO_set_md(mdtmp, EVP_sha1());
225\& bio = BIO_push(mdtmp, bio);
226\& mdtmp = BIO_new(BIO_f_md());
227\& BIO_set_md(mdtmp, EVP_md5());
228\& bio = BIO_push(mdtmp, bio);
229\& do {
230\& rdlen = BIO_read(bio, buf, sizeof(buf));
231\& /* Might want to do something with the data here */
232\& } while(rdlen > 0);
233.Ve
234.PP
235This next example retrieves the message digests from a \s-1BIO\s0 chain and
236outputs them. This could be used with the examples above.
237.PP
|
241.Vb 16
| 238.Vb 10
|
242\& BIO *mdtmp;
243\& unsigned char mdbuf[EVP_MAX_MD_SIZE];
244\& int mdlen;
245\& int i;
246\& mdtmp = bio; /* Assume bio has previously been set up */
247\& do {
248\& EVP_MD *md;
249\& mdtmp = BIO_find_type(mdtmp, BIO_TYPE_MD);
250\& if(!mdtmp) break;
251\& BIO_get_md(mdtmp, &md);
252\& printf("%s digest", OBJ_nid2sn(EVP_MD_type(md)));
253\& mdlen = BIO_gets(mdtmp, mdbuf, EVP_MAX_MD_SIZE);
254\& for(i = 0; i < mdlen; i++) printf(":%02X", mdbuf[i]);
255\& printf("\en");
256\& mdtmp = BIO_next(mdtmp);
257\& } while(mdtmp);
| 239\& BIO *mdtmp;
240\& unsigned char mdbuf[EVP_MAX_MD_SIZE];
241\& int mdlen;
242\& int i;
243\& mdtmp = bio; /* Assume bio has previously been set up */
244\& do {
245\& EVP_MD *md;
246\& mdtmp = BIO_find_type(mdtmp, BIO_TYPE_MD);
247\& if(!mdtmp) break;
248\& BIO_get_md(mdtmp, &md);
249\& printf("%s digest", OBJ_nid2sn(EVP_MD_type(md)));
250\& mdlen = BIO_gets(mdtmp, mdbuf, EVP_MAX_MD_SIZE);
251\& for(i = 0; i < mdlen; i++) printf(":%02X", mdbuf[i]);
252\& printf("\en");
253\& mdtmp = BIO_next(mdtmp);
254\& } while(mdtmp);
|
258.Ve
259.PP
260.Vb 1
| 255\&
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261\& BIO_free_all(bio);
262.Ve
263.SH "BUGS"
264.IX Header "BUGS"
265The lack of support for \fIBIO_puts()\fR and the non standard behaviour of
266\&\fIBIO_gets()\fR could be regarded as anomalous. It could be argued that \fIBIO_gets()\fR
267and \fIBIO_puts()\fR should be passed to the next \s-1BIO\s0 in the chain and digest
268the data passed through and that digests should be retrieved using a
269separate \fIBIO_ctrl()\fR call.
270.SH "SEE ALSO"
271.IX Header "SEE ALSO"
272\&\s-1TBA\s0
| 256\& BIO_free_all(bio);
257.Ve
258.SH "BUGS"
259.IX Header "BUGS"
260The lack of support for \fIBIO_puts()\fR and the non standard behaviour of
261\&\fIBIO_gets()\fR could be regarded as anomalous. It could be argued that \fIBIO_gets()\fR
262and \fIBIO_puts()\fR should be passed to the next \s-1BIO\s0 in the chain and digest
263the data passed through and that digests should be retrieved using a
264separate \fIBIO_ctrl()\fR call.
265.SH "SEE ALSO"
266.IX Header "SEE ALSO"
267\&\s-1TBA\s0
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