418 lines
16 KiB
Groff
418 lines
16 KiB
Groff
.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.30)
|
|
.\"
|
|
.\" 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 turned on, 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 "EVP_DigestInit 3"
|
|
.TH EVP_DigestInit 3 "2015-06-12" "1.0.1o" "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"
|
|
EVP_MD_CTX_init, EVP_MD_CTX_create, EVP_DigestInit_ex, EVP_DigestUpdate,
|
|
EVP_DigestFinal_ex, EVP_MD_CTX_cleanup, EVP_MD_CTX_destroy, EVP_MAX_MD_SIZE,
|
|
EVP_MD_CTX_copy_ex, EVP_MD_CTX_copy, EVP_MD_type, EVP_MD_pkey_type, EVP_MD_size,
|
|
EVP_MD_block_size, EVP_MD_CTX_md, EVP_MD_CTX_size, EVP_MD_CTX_block_size, EVP_MD_CTX_type,
|
|
EVP_md_null, EVP_md2, EVP_md5, EVP_sha, EVP_sha1, EVP_sha224, EVP_sha256,
|
|
EVP_sha384, EVP_sha512, EVP_dss, EVP_dss1, EVP_mdc2,
|
|
EVP_ripemd160, EVP_get_digestbyname, EVP_get_digestbynid, EVP_get_digestbyobj \-
|
|
EVP digest routines
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 1
|
|
\& #include <openssl/evp.h>
|
|
\&
|
|
\& void EVP_MD_CTX_init(EVP_MD_CTX *ctx);
|
|
\& EVP_MD_CTX *EVP_MD_CTX_create(void);
|
|
\&
|
|
\& int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl);
|
|
\& int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt);
|
|
\& int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md,
|
|
\& unsigned int *s);
|
|
\&
|
|
\& int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx);
|
|
\& void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx);
|
|
\&
|
|
\& int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in);
|
|
\&
|
|
\& int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type);
|
|
\& int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md,
|
|
\& unsigned int *s);
|
|
\&
|
|
\& int EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in);
|
|
\&
|
|
\& #define EVP_MAX_MD_SIZE 64 /* SHA512 */
|
|
\&
|
|
\& int EVP_MD_type(const EVP_MD *md);
|
|
\& int EVP_MD_pkey_type(const EVP_MD *md);
|
|
\& int EVP_MD_size(const EVP_MD *md);
|
|
\& int EVP_MD_block_size(const EVP_MD *md);
|
|
\&
|
|
\& const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx);
|
|
\& #define EVP_MD_CTX_size(e) EVP_MD_size(EVP_MD_CTX_md(e))
|
|
\& #define EVP_MD_CTX_block_size(e) EVP_MD_block_size((e)\->digest)
|
|
\& #define EVP_MD_CTX_type(e) EVP_MD_type((e)\->digest)
|
|
\&
|
|
\& const EVP_MD *EVP_md_null(void);
|
|
\& const EVP_MD *EVP_md2(void);
|
|
\& const EVP_MD *EVP_md5(void);
|
|
\& const EVP_MD *EVP_sha(void);
|
|
\& const EVP_MD *EVP_sha1(void);
|
|
\& const EVP_MD *EVP_dss(void);
|
|
\& const EVP_MD *EVP_dss1(void);
|
|
\& const EVP_MD *EVP_mdc2(void);
|
|
\& const EVP_MD *EVP_ripemd160(void);
|
|
\&
|
|
\& const EVP_MD *EVP_sha224(void);
|
|
\& const EVP_MD *EVP_sha256(void);
|
|
\& const EVP_MD *EVP_sha384(void);
|
|
\& const EVP_MD *EVP_sha512(void);
|
|
\&
|
|
\& const EVP_MD *EVP_get_digestbyname(const char *name);
|
|
\& #define EVP_get_digestbynid(a) EVP_get_digestbyname(OBJ_nid2sn(a))
|
|
\& #define EVP_get_digestbyobj(a) EVP_get_digestbynid(OBJ_obj2nid(a))
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
The \s-1EVP\s0 digest routines are a high level interface to message digests.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_init()\fR initializes digest context \fBctx\fR.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_create()\fR allocates, initializes and returns a digest context.
|
|
.PP
|
|
\&\fIEVP_DigestInit_ex()\fR sets up digest context \fBctx\fR to use a digest
|
|
\&\fBtype\fR from \s-1ENGINE \s0\fBimpl\fR. \fBctx\fR must be initialized before calling this
|
|
function. \fBtype\fR will typically be supplied by a functionsuch as \fIEVP_sha1()\fR.
|
|
If \fBimpl\fR is \s-1NULL\s0 then the default implementation of digest \fBtype\fR is used.
|
|
.PP
|
|
\&\fIEVP_DigestUpdate()\fR hashes \fBcnt\fR bytes of data at \fBd\fR into the
|
|
digest context \fBctx\fR. This function can be called several times on the
|
|
same \fBctx\fR to hash additional data.
|
|
.PP
|
|
\&\fIEVP_DigestFinal_ex()\fR retrieves the digest value from \fBctx\fR and places
|
|
it in \fBmd\fR. If the \fBs\fR parameter is not \s-1NULL\s0 then the number of
|
|
bytes of data written (i.e. the length of the digest) will be written
|
|
to the integer at \fBs\fR, at most \fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes will be written.
|
|
After calling \fIEVP_DigestFinal_ex()\fR no additional calls to \fIEVP_DigestUpdate()\fR
|
|
can be made, but \fIEVP_DigestInit_ex()\fR can be called to initialize a new
|
|
digest operation.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_cleanup()\fR cleans up digest context \fBctx\fR, it should be called
|
|
after a digest context is no longer needed.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_destroy()\fR cleans up digest context \fBctx\fR and frees up the
|
|
space allocated to it, it should be called only on a context created
|
|
using \fIEVP_MD_CTX_create()\fR.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_copy_ex()\fR can be used to copy the message digest state from
|
|
\&\fBin\fR to \fBout\fR. This is useful if large amounts of data are to be
|
|
hashed which only differ in the last few bytes. \fBout\fR must be initialized
|
|
before calling this function.
|
|
.PP
|
|
\&\fIEVP_DigestInit()\fR behaves in the same way as \fIEVP_DigestInit_ex()\fR except
|
|
the passed context \fBctx\fR does not have to be initialized, and it always
|
|
uses the default digest implementation.
|
|
.PP
|
|
\&\fIEVP_DigestFinal()\fR is similar to \fIEVP_DigestFinal_ex()\fR except the digest
|
|
context \fBctx\fR is automatically cleaned up.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_copy()\fR is similar to \fIEVP_MD_CTX_copy_ex()\fR except the destination
|
|
\&\fBout\fR does not have to be initialized.
|
|
.PP
|
|
\&\fIEVP_MD_size()\fR and \fIEVP_MD_CTX_size()\fR return the size of the message digest
|
|
when passed an \fB\s-1EVP_MD\s0\fR or an \fB\s-1EVP_MD_CTX\s0\fR structure, i.e. the size of the
|
|
hash.
|
|
.PP
|
|
\&\fIEVP_MD_block_size()\fR and \fIEVP_MD_CTX_block_size()\fR return the block size of the
|
|
message digest when passed an \fB\s-1EVP_MD\s0\fR or an \fB\s-1EVP_MD_CTX\s0\fR structure.
|
|
.PP
|
|
\&\fIEVP_MD_type()\fR and \fIEVP_MD_CTX_type()\fR return the \s-1NID\s0 of the \s-1OBJECT IDENTIFIER\s0
|
|
representing the given message digest when passed an \fB\s-1EVP_MD\s0\fR structure.
|
|
For example EVP_MD_type(\fIEVP_sha1()\fR) returns \fBNID_sha1\fR. This function is
|
|
normally used when setting \s-1ASN1\s0 OIDs.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_md()\fR returns the \fB\s-1EVP_MD\s0\fR structure corresponding to the passed
|
|
\&\fB\s-1EVP_MD_CTX\s0\fR.
|
|
.PP
|
|
\&\fIEVP_MD_pkey_type()\fR returns the \s-1NID\s0 of the public key signing algorithm associated
|
|
with this digest. For example \fIEVP_sha1()\fR is associated with \s-1RSA\s0 so this will
|
|
return \fBNID_sha1WithRSAEncryption\fR. Since digests and signature algorithms
|
|
are no longer linked this function is only retained for compatibility
|
|
reasons.
|
|
.PP
|
|
\&\fIEVP_md2()\fR, \fIEVP_md5()\fR, \fIEVP_sha()\fR, \fIEVP_sha1()\fR, \fIEVP_sha224()\fR, \fIEVP_sha256()\fR,
|
|
\&\fIEVP_sha384()\fR, \fIEVP_sha512()\fR, \fIEVP_mdc2()\fR and \fIEVP_ripemd160()\fR return \fB\s-1EVP_MD\s0\fR
|
|
structures for the \s-1MD2, MD5, SHA, SHA1, SHA224, SHA256, SHA384, SHA512, MDC2\s0
|
|
and \s-1RIPEMD160\s0 digest algorithms respectively.
|
|
.PP
|
|
\&\fIEVP_dss()\fR and \fIEVP_dss1()\fR return \fB\s-1EVP_MD\s0\fR structures for \s-1SHA\s0 and \s-1SHA1\s0 digest
|
|
algorithms but using \s-1DSS \s0(\s-1DSA\s0) for the signature algorithm. Note: there is
|
|
no need to use these pseudo-digests in OpenSSL 1.0.0 and later, they are
|
|
however retained for compatibility.
|
|
.PP
|
|
\&\fIEVP_md_null()\fR is a \*(L"null\*(R" message digest that does nothing: i.e. the hash it
|
|
returns is of zero length.
|
|
.PP
|
|
\&\fIEVP_get_digestbyname()\fR, \fIEVP_get_digestbynid()\fR and \fIEVP_get_digestbyobj()\fR
|
|
return an \fB\s-1EVP_MD\s0\fR structure when passed a digest name, a digest \s-1NID\s0 or
|
|
an \s-1ASN1_OBJECT\s0 structure respectively. The digest table must be initialized
|
|
using, for example, \fIOpenSSL_add_all_digests()\fR for these functions to work.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fIEVP_DigestInit_ex()\fR, \fIEVP_DigestUpdate()\fR and \fIEVP_DigestFinal_ex()\fR return 1 for
|
|
success and 0 for failure.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_copy_ex()\fR returns 1 if successful or 0 for failure.
|
|
.PP
|
|
\&\fIEVP_MD_type()\fR, \fIEVP_MD_pkey_type()\fR and \fIEVP_MD_type()\fR return the \s-1NID\s0 of the
|
|
corresponding \s-1OBJECT IDENTIFIER\s0 or NID_undef if none exists.
|
|
.PP
|
|
\&\fIEVP_MD_size()\fR, \fIEVP_MD_block_size()\fR, \fIEVP_MD_CTX_size()\fR and
|
|
\&\fIEVP_MD_CTX_block_size()\fR return the digest or block size in bytes.
|
|
.PP
|
|
\&\fIEVP_md_null()\fR, \fIEVP_md2()\fR, \fIEVP_md5()\fR, \fIEVP_sha()\fR, \fIEVP_sha1()\fR, \fIEVP_dss()\fR,
|
|
\&\fIEVP_dss1()\fR, \fIEVP_mdc2()\fR and \fIEVP_ripemd160()\fR return pointers to the
|
|
corresponding \s-1EVP_MD\s0 structures.
|
|
.PP
|
|
\&\fIEVP_get_digestbyname()\fR, \fIEVP_get_digestbynid()\fR and \fIEVP_get_digestbyobj()\fR
|
|
return either an \fB\s-1EVP_MD\s0\fR structure or \s-1NULL\s0 if an error occurs.
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
The \fB\s-1EVP\s0\fR interface to message digests should almost always be used in
|
|
preference to the low level interfaces. This is because the code then becomes
|
|
transparent to the digest used and much more flexible.
|
|
.PP
|
|
New applications should use the \s-1SHA2\s0 digest algorithms such as \s-1SHA256.\s0
|
|
The other digest algorithms are still in common use.
|
|
.PP
|
|
For most applications the \fBimpl\fR parameter to \fIEVP_DigestInit_ex()\fR will be
|
|
set to \s-1NULL\s0 to use the default digest implementation.
|
|
.PP
|
|
The functions \fIEVP_DigestInit()\fR, \fIEVP_DigestFinal()\fR and \fIEVP_MD_CTX_copy()\fR are
|
|
obsolete but are retained to maintain compatibility with existing code. New
|
|
applications should use \fIEVP_DigestInit_ex()\fR, \fIEVP_DigestFinal_ex()\fR and
|
|
\&\fIEVP_MD_CTX_copy_ex()\fR because they can efficiently reuse a digest context
|
|
instead of initializing and cleaning it up on each call and allow non default
|
|
implementations of digests to be specified.
|
|
.PP
|
|
In OpenSSL 0.9.7 and later if digest contexts are not cleaned up after use
|
|
memory leaks will occur.
|
|
.PP
|
|
Stack allocation of \s-1EVP_MD_CTX\s0 structures is common, for example:
|
|
.PP
|
|
.Vb 2
|
|
\& EVP_MD_CTX mctx;
|
|
\& EVP_MD_CTX_init(&mctx);
|
|
.Ve
|
|
.PP
|
|
This will cause binary compatibility issues if the size of \s-1EVP_MD_CTX\s0
|
|
structure changes (this will only happen with a major release of OpenSSL).
|
|
Applications wishing to avoid this should use \fIEVP_MD_CTX_create()\fR instead:
|
|
.PP
|
|
.Vb 2
|
|
\& EVP_MD_CTX *mctx;
|
|
\& mctx = EVP_MD_CTX_create();
|
|
.Ve
|
|
.SH "EXAMPLE"
|
|
.IX Header "EXAMPLE"
|
|
This example digests the data \*(L"Test Message\en\*(R" and \*(L"Hello World\en\*(R", using the
|
|
digest name passed on the command line.
|
|
.PP
|
|
.Vb 2
|
|
\& #include <stdio.h>
|
|
\& #include <openssl/evp.h>
|
|
\&
|
|
\& main(int argc, char *argv[])
|
|
\& {
|
|
\& EVP_MD_CTX *mdctx;
|
|
\& const EVP_MD *md;
|
|
\& char mess1[] = "Test Message\en";
|
|
\& char mess2[] = "Hello World\en";
|
|
\& unsigned char md_value[EVP_MAX_MD_SIZE];
|
|
\& int md_len, i;
|
|
\&
|
|
\& OpenSSL_add_all_digests();
|
|
\&
|
|
\& if(!argv[1]) {
|
|
\& printf("Usage: mdtest digestname\en");
|
|
\& exit(1);
|
|
\& }
|
|
\&
|
|
\& md = EVP_get_digestbyname(argv[1]);
|
|
\&
|
|
\& if(!md) {
|
|
\& printf("Unknown message digest %s\en", argv[1]);
|
|
\& exit(1);
|
|
\& }
|
|
\&
|
|
\& mdctx = EVP_MD_CTX_create();
|
|
\& EVP_DigestInit_ex(mdctx, md, NULL);
|
|
\& EVP_DigestUpdate(mdctx, mess1, strlen(mess1));
|
|
\& EVP_DigestUpdate(mdctx, mess2, strlen(mess2));
|
|
\& EVP_DigestFinal_ex(mdctx, md_value, &md_len);
|
|
\& EVP_MD_CTX_destroy(mdctx);
|
|
\&
|
|
\& printf("Digest is: ");
|
|
\& for(i = 0; i < md_len; i++)
|
|
\& printf("%02x", md_value[i]);
|
|
\& printf("\en");
|
|
\&
|
|
\& /* Call this once before exit. */
|
|
\& EVP_cleanup();
|
|
\& exit(0);
|
|
\& }
|
|
.Ve
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIdgst\fR\|(1),
|
|
\&\fIevp\fR\|(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
\&\fIEVP_DigestInit()\fR, \fIEVP_DigestUpdate()\fR and \fIEVP_DigestFinal()\fR are
|
|
available in all versions of SSLeay and OpenSSL.
|
|
.PP
|
|
\&\fIEVP_MD_CTX_init()\fR, \fIEVP_MD_CTX_create()\fR, \fIEVP_MD_CTX_copy_ex()\fR,
|
|
\&\fIEVP_MD_CTX_cleanup()\fR, \fIEVP_MD_CTX_destroy()\fR, \fIEVP_DigestInit_ex()\fR
|
|
and \fIEVP_DigestFinal_ex()\fR were added in OpenSSL 0.9.7.
|
|
.PP
|
|
\&\fIEVP_md_null()\fR, \fIEVP_md2()\fR, \fIEVP_md5()\fR, \fIEVP_sha()\fR, \fIEVP_sha1()\fR,
|
|
\&\fIEVP_dss()\fR, \fIEVP_dss1()\fR, \fIEVP_mdc2()\fR and \fIEVP_ripemd160()\fR were
|
|
changed to return truely const \s-1EVP_MD\s0 * in OpenSSL 0.9.7.
|
|
.PP
|
|
The link between digests and signing algorithms was fixed in OpenSSL 1.0 and
|
|
later, so now \fIEVP_sha1()\fR can be used with \s-1RSA\s0 and \s-1DSA\s0; there is no need to
|
|
use \fIEVP_dss1()\fR any more.
|
|
.PP
|
|
OpenSSL 1.0 and later does not include the \s-1MD2\s0 digest algorithm in the
|
|
default configuration due to its security weaknesses.
|