#$@%#$%!

Ngiler SH3LL 360
: / opt / cpanel / ea-openssl11 / share / man / man3 /

Information Server
MySQL : OFF Perl : OFF CURL : ON WGET : OFF PKEXEC : OFF

Directive	Local Value
IP Address	162.0.209.101
System	Linux premium169.web-hosting.com 4.18.0-553.50.1.lve.el8.x86_64 #1 SMP Thu Apr 17 19:10:24 UTC 2025 x86_64
User	luxeelil
PHP Version	8.0.30
Software	LiteSpeed
Doc root	Writable

Edit File : BIO_get_md.3 \| Size : 9.30 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \(C` and \(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(W\h'-12u'\(W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(W\h'-12u'\(W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \\|\(em\\| . ds PI \(p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). .\" Fear. Run. Save yourself. No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u)).13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu8/10-\(#H)'\'\h"\|\\n:u" . ds ` \\k:\h'-(\\n(.wu8/10-\(#H)'\`\h'\|\\n:u' . ds ^ \\k:\h'-(\\n(.wu10/11-\(#H)'^\h'\|\\n:u' . ds , \\k:\h'-(\\n(.wu8/10)',\h'\|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\(#H-.1m)'~\h'\|\\n:u' . ds / \\k:\h'-(\\n(.wu8/10-\(#H)'\z\(sl\h'\|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu8/10-\(#H+.1m+\(#F)'\v'-\(#V'\z.\h'.2m+\(#F'.\h'\|\\n:u'\v'\(#V' .ds 8 \h'\(#H'\(b\h'-\(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\(#H)/2u'\v'-.3n'\(#[\z\(de\v'.3n'\h'\|\\n:u'\(#] .ds d- \h'\(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'\|\\n:u' .ds th \(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u2/3)'\s-1o\s+1\(#] .ds Th \(#[\s+2I\s-2\h'-\w'I'u3/5'\v'-.3m'o\v'.3m'\(#] .ds ae a\h'-(\w'a'u4/10)'e .ds Ae A\h'-(\w'A'u4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu9/10-\(#H)'\s-2\u~\d\s+2\h'\|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu10/11-\(#H)'\v'-.4m'^\v'.4m'\h'\|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "BIO_F_MD 3" .TH BIO_F_MD 3 "2023-09-11" "1.1.1w" "OpenSSL" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BIO_f_md, BIO_set_md, BIO_get_md, BIO_get_md_ctx \- message digest BIO filter .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 2 \& #include <openssl/bio.h> \& #include <openssl/evp.h> \& \& const BIO_METHOD BIO_f_md(void); \& int BIO_set_md(BIO b, EVP_MD md); \& int BIO_get_md(BIO b, EVP_MD mdp); \& int BIO_get_md_ctx(BIO b, EVP_MD_CTX *mdcp); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBIO_f_md()\fR returns the message digest \s-1BIO\s0 method. This is a filter \&\s-1BIO\s0 that digests any data passed through it, it is a \s-1BIO\s0 wrapper for the digest routines \fBEVP_DigestInit()\fR, \fBEVP_DigestUpdate()\fR and \fBEVP_DigestFinal()\fR. .PP Any data written or read through a digest \s-1BIO\s0 using \fBBIO_read_ex()\fR and \&\fBBIO_write_ex()\fR is digested. .PP \&\fBBIO_gets()\fR, if its \fBsize\fR parameter is large enough finishes the digest calculation and returns the digest value. \fBBIO_puts()\fR is not supported. .PP \&\fBBIO_reset()\fR reinitialises a digest \s-1BIO.\s0 .PP \&\fBBIO_set_md()\fR sets the message digest of \s-1BIO\s0 \fBb\fR to \fBmd\fR: this must be called to initialize a digest \s-1BIO\s0 before any data is passed through it. It is a \fBBIO_ctrl()\fR macro. .PP \&\fBBIO_get_md()\fR places the a pointer to the digest BIOs digest method in \fBmdp\fR, it is a \fBBIO_ctrl()\fR macro. .PP \&\fBBIO_get_md_ctx()\fR returns the digest BIOs context into \fBmdcp\fR. .SH "NOTES" .IX Header "NOTES" The context returned by \fBBIO_get_md_ctx()\fR can be used in calls to \fBEVP_DigestFinal()\fR and also the signature routines \fBEVP_SignFinal()\fR and \fBEVP_VerifyFinal()\fR. .PP The context returned by \fBBIO_get_md_ctx()\fR is an internal context structure. Changes made to this context will affect the digest \&\s-1BIO\s0 itself and the context pointer will become invalid when the digest \&\s-1BIO\s0 is freed. .PP After the digest has been retrieved from a digest \s-1BIO\s0 it must be reinitialized by calling \fBBIO_reset()\fR, or \fBBIO_set_md()\fR before any more data is passed through it. .PP If an application needs to call \fBBIO_gets()\fR or \fBBIO_puts()\fR through a chain containing digest BIOs then this can be done by prepending a buffering \s-1BIO.\s0 .PP Calling \fBBIO_get_md_ctx()\fR will return the context and initialize the \s-1BIO\s0 state. This allows applications to initialize the context externally if the standard calls such as \fBBIO_set_md()\fR are not sufficiently flexible. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_f_md()\fR returns the digest \s-1BIO\s0 method. .PP \&\fBBIO_set_md()\fR, \fBBIO_get_md()\fR and \fBBIO_md_ctx()\fR return 1 for success and 0 for failure. .SH "EXAMPLES" .IX Header "EXAMPLES" The following example creates a \s-1BIO\s0 chain containing an \s-1SHA1\s0 and \s-1MD5\s0 digest \s-1BIO\s0 and passes the string \(L"Hello World\(R" through it. Error checking has been omitted for clarity. .PP .Vb 2 \& BIO bio, mdtmp; \& char message[] = "Hello World"; \& \& bio = BIO_new(BIO_s_null()); \& mdtmp = BIO_new(BIO_f_md()); \& BIO_set_md(mdtmp, EVP_sha1()); \& / \& * For BIO_push() we want to append the sink BIO and keep a note of \& * the start of the chain. \& / \& bio = BIO_push(mdtmp, bio); \& mdtmp = BIO_new(BIO_f_md()); \& BIO_set_md(mdtmp, EVP_md5()); \& bio = BIO_push(mdtmp, bio); \& / Note: mdtmp can now be discarded / \& BIO_write(bio, message, strlen(message)); .Ve .PP The next example digests data by reading through a chain instead: .PP .Vb 3 \& BIO bio, mdtmp; \& char buf[1024]; \& int rdlen; \& \& bio = BIO_new_file(file, "rb"); \& mdtmp = BIO_new(BIO_f_md()); \& BIO_set_md(mdtmp, EVP_sha1()); \& bio = BIO_push(mdtmp, bio); \& mdtmp = BIO_new(BIO_f_md()); \& BIO_set_md(mdtmp, EVP_md5()); \& bio = BIO_push(mdtmp, bio); \& do { \& rdlen = BIO_read(bio, buf, sizeof(buf)); \& / Might want to do something with the data here / \& } while (rdlen > 0); .Ve .PP This next example retrieves the message digests from a \s-1BIO\s0 chain and outputs them. This could be used with the examples above. .PP .Vb 4 \& BIO mdtmp; \& unsigned char mdbuf[EVP_MAX_MD_SIZE]; \& int mdlen; \& int i; \& \& mdtmp = bio; /* Assume bio has previously been set up / \& do { \& EVP_MD md; \& \& mdtmp = BIO_find_type(mdtmp, BIO_TYPE_MD); \& if (!mdtmp) \& break; \& BIO_get_md(mdtmp, &md); \& printf("%s digest", OBJ_nid2sn(EVP_MD_type(md))); \& mdlen = BIO_gets(mdtmp, mdbuf, EVP_MAX_MD_SIZE); \& for (i = 0; i < mdlen; i++) printf(":%02X", mdbuf[i]); \& printf("\en"); \& mdtmp = BIO_next(mdtmp); \& } while (mdtmp); \& \& BIO_free_all(bio); .Ve .SH "BUGS" .IX Header "BUGS" The lack of support for \fBBIO_puts()\fR and the non standard behaviour of \&\fBBIO_gets()\fR could be regarded as anomalous. It could be argued that \fBBIO_gets()\fR and \fBBIO_puts()\fR should be passed to the next \s-1BIO\s0 in the chain and digest the data passed through and that digests should be retrieved using a separate \fBBIO_ctrl()\fR call. .SH "HISTORY" .IX Header "HISTORY" Before OpenSSL 1.0.0., the call to \fBBIO_get_md_ctx()\fR would only work if the \&\s-1BIO\s0 was initialized first. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>. Back

Edit File : BIO_get_md.3 | Size : 9.30 KB

.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" Set up some character translations and predefined strings.  \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote.  \*(C+ will
.\" give a nicer C++.  Capital omega is used to do unbreakable dashes and
.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
.\" nothing in troff, for use with C<>.
.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
.    ds -- \(*W-
.    ds PI pi
.    if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
.    if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\"  diablo 12 pitch
.    ds L" ""
.    ds R" ""
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds -- \|\(em\|
.    ds PI \(*p
.    ds L" ``
.    ds R" ''
.    ds C`
.    ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
.    if \nF \{\
.        de IX
.        tm Index:\\$1\t\\n%\t"\\$2"
..
.        if !\nF==2 \{\
.            nr % 0
.            nr F 2
.        \}
.    \}
.\}
.rr rF
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
.    \" fudge factors for nroff and troff
.if n \{\
.    ds #H 0
.    ds #V .8m
.    ds #F .3m
.    ds #[ \f1
.    ds #] \fP
.\}
.if t \{\
.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
.    ds #V .6m
.    ds #F 0
.    ds #[ \&
.    ds #] \&
.\}
.    \" simple accents for nroff and troff
.if n \{\
.    ds ' \&
.    ds ` \&
.    ds ^ \&
.    ds , \&
.    ds ~ ~
.    ds /
.\}
.if t \{\
.    ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
.    ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
.    ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
.    ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
.    ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
.    ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
.    \" troff and (daisy-wheel) nroff accents
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
.    \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
.    \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
.    ds : e
.    ds 8 ss
.    ds o a
.    ds d- d\h'-1'\(ga
.    ds D- D\h'-1'\(hy
.    ds th \o'bp'
.    ds Th \o'LP'
.    ds ae ae
.    ds Ae AE
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "BIO_F_MD 3"
.TH BIO_F_MD 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
BIO_f_md, BIO_set_md, BIO_get_md, BIO_get_md_ctx \- message digest BIO filter
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\& #include <openssl/bio.h>
\& #include <openssl/evp.h>
\&
\& const BIO_METHOD *BIO_f_md(void);
\& int BIO_set_md(BIO *b, EVP_MD *md);
\& int BIO_get_md(BIO *b, EVP_MD **mdp);
\& int BIO_get_md_ctx(BIO *b, EVP_MD_CTX **mdcp);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBIO_f_md()\fR returns the message digest \s-1BIO\s0 method. This is a filter
\&\s-1BIO\s0 that digests any data passed through it, it is a \s-1BIO\s0 wrapper
for the digest routines \fBEVP_DigestInit()\fR, \fBEVP_DigestUpdate()\fR
and \fBEVP_DigestFinal()\fR.
.PP
Any data written or read through a digest \s-1BIO\s0 using \fBBIO_read_ex()\fR and
\&\fBBIO_write_ex()\fR is digested.
.PP
\&\fBBIO_gets()\fR, if its \fBsize\fR parameter is large enough finishes the
digest calculation and returns the digest value. \fBBIO_puts()\fR is
not supported.
.PP
\&\fBBIO_reset()\fR reinitialises a digest \s-1BIO.\s0
.PP
\&\fBBIO_set_md()\fR sets the message digest of \s-1BIO\s0 \fBb\fR to \fBmd\fR: this
must be called to initialize a digest \s-1BIO\s0 before any data is
passed through it. It is a \fBBIO_ctrl()\fR macro.
.PP
\&\fBBIO_get_md()\fR places the a pointer to the digest BIOs digest method
in \fBmdp\fR, it is a \fBBIO_ctrl()\fR macro.
.PP
\&\fBBIO_get_md_ctx()\fR returns the digest BIOs context into \fBmdcp\fR.
.SH "NOTES"
.IX Header "NOTES"
The context returned by \fBBIO_get_md_ctx()\fR can be used in calls
to \fBEVP_DigestFinal()\fR and also the signature routines \fBEVP_SignFinal()\fR
and \fBEVP_VerifyFinal()\fR.
.PP
The context returned by \fBBIO_get_md_ctx()\fR is an internal context
structure. Changes made to this context will affect the digest
\&\s-1BIO\s0 itself and the context pointer will become invalid when the digest
\&\s-1BIO\s0 is freed.
.PP
After the digest has been retrieved from a digest \s-1BIO\s0 it must be
reinitialized by calling \fBBIO_reset()\fR, or \fBBIO_set_md()\fR before any more
data is passed through it.
.PP
If an application needs to call \fBBIO_gets()\fR or \fBBIO_puts()\fR through
a chain containing digest BIOs then this can be done by prepending
a buffering \s-1BIO.\s0
.PP
Calling \fBBIO_get_md_ctx()\fR will return the context and initialize the \s-1BIO\s0
state. This allows applications to initialize the context externally
if the standard calls such as \fBBIO_set_md()\fR are not sufficiently flexible.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_f_md()\fR returns the digest \s-1BIO\s0 method.
.PP
\&\fBBIO_set_md()\fR, \fBBIO_get_md()\fR and \fBBIO_md_ctx()\fR return 1 for success and
0 for failure.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
The following example creates a \s-1BIO\s0 chain containing an \s-1SHA1\s0 and \s-1MD5\s0
digest \s-1BIO\s0 and passes the string \*(L"Hello World\*(R" through it. Error
checking has been omitted for clarity.
.PP
.Vb 2
\& BIO *bio, *mdtmp;
\& char message[] = "Hello World";
\&
\& bio = BIO_new(BIO_s_null());
\& mdtmp = BIO_new(BIO_f_md());
\& BIO_set_md(mdtmp, EVP_sha1());
\& /*
\&  * For BIO_push() we want to append the sink BIO and keep a note of
\&  * the start of the chain.
\&  */
\& bio = BIO_push(mdtmp, bio);
\& mdtmp = BIO_new(BIO_f_md());
\& BIO_set_md(mdtmp, EVP_md5());
\& bio = BIO_push(mdtmp, bio);
\& /* Note: mdtmp can now be discarded */
\& BIO_write(bio, message, strlen(message));
.Ve
.PP
The next example digests data by reading through a chain instead:
.PP
.Vb 3
\& BIO *bio, *mdtmp;
\& char buf[1024];
\& int rdlen;
\&
\& bio = BIO_new_file(file, "rb");
\& mdtmp = BIO_new(BIO_f_md());
\& BIO_set_md(mdtmp, EVP_sha1());
\& bio = BIO_push(mdtmp, bio);
\& mdtmp = BIO_new(BIO_f_md());
\& BIO_set_md(mdtmp, EVP_md5());
\& bio = BIO_push(mdtmp, bio);
\& do {
\&     rdlen = BIO_read(bio, buf, sizeof(buf));
\&     /* Might want to do something with the data here */
\& } while (rdlen > 0);
.Ve
.PP
This next example retrieves the message digests from a \s-1BIO\s0 chain and
outputs them. This could be used with the examples above.
.PP
.Vb 4
\& BIO *mdtmp;
\& unsigned char mdbuf[EVP_MAX_MD_SIZE];
\& int mdlen;
\& int i;
\&
\& mdtmp = bio;   /* Assume bio has previously been set up */
\& do {
\&     EVP_MD *md;
\&
\&     mdtmp = BIO_find_type(mdtmp, BIO_TYPE_MD);
\&     if (!mdtmp)
\&         break;
\&     BIO_get_md(mdtmp, &md);
\&     printf("%s digest", OBJ_nid2sn(EVP_MD_type(md)));
\&     mdlen = BIO_gets(mdtmp, mdbuf, EVP_MAX_MD_SIZE);
\&     for (i = 0; i < mdlen; i++) printf(":%02X", mdbuf[i]);
\&     printf("\en");
\&     mdtmp = BIO_next(mdtmp);
\& } while (mdtmp);
\&
\& BIO_free_all(bio);
.Ve
.SH "BUGS"
.IX Header "BUGS"
The lack of support for \fBBIO_puts()\fR and the non standard behaviour of
\&\fBBIO_gets()\fR could be regarded as anomalous. It could be argued that \fBBIO_gets()\fR
and \fBBIO_puts()\fR should be passed to the next \s-1BIO\s0 in the chain and digest
the data passed through and that digests should be retrieved using a
separate \fBBIO_ctrl()\fR call.
.SH "HISTORY"
.IX Header "HISTORY"
Before OpenSSL 1.0.0., the call to \fBBIO_get_md_ctx()\fR would only work if the
\&\s-1BIO\s0 was initialized first.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

Back