.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.43)
.\"
.\" 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 "EVP_SIGNATURE-ECDSA 7ossl"
.TH EVP_SIGNATURE-ECDSA 7ossl "2025-09-30" "3.5.4" "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_SIGNATURE\-ECDSA \- The EVP_PKEY ECDSA signature implementation.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Support for computing \s-1ECDSA\s0 signatures.
See \s-1\fBEVP_PKEY\-EC\s0\fR\|(7) for information related to \s-1EC\s0 keys.
.SS "Algorithm Names"
.IX Subsection "Algorithm Names"
In this list, names are grouped together to signify that they are the same
algorithm having multiple names.  This also includes the \s-1OID\s0 in canonical
decimal form (which means that they are possible to fetch if the caller has a
mere \s-1OID\s0 which came out in this form after a call to \fBOBJ_obj2txt\fR\|(3)).
.ie n .IP """\s-1ECDSA""\s0" 4
.el .IP "``\s-1ECDSA''\s0" 4
.IX Item "ECDSA"
The base signature algorithm, supported explicitly fetched with
\&\fBEVP_PKEY_sign_init_ex2\fR\|(3), and implicitly fetched (through
\&\s-1EC\s0 keys) with \fBEVP_DigestSignInit\fR\|(3) and
\&\fBEVP_DigestVerifyInit\fR\|(3).
.Sp
It can't be used with \fBEVP_PKEY_sign_message_init\fR\|(3)
.ie n .IP """\s-1ECDSA\-SHA1"", ""ECDSA\-SHA\-1"",\s0 ""ecdsa\-with\-SHA1"", ""1.2.840.10045.4.1""" 4
.el .IP "``\s-1ECDSA\-SHA1'', ``ECDSA\-SHA\-1'',\s0 ``ecdsa\-with\-SHA1'', ``1.2.840.10045.4.1''" 4
.IX Item "ECDSA-SHA1, ECDSA-SHA-1, ecdsa-with-SHA1, 1.2.840.10045.4.1"
.PD 0
.ie n .IP """\s-1ECDSA\-SHA2\-224"", ""ECDSA\-SHA224"",\s0 ""ecdsa\-with\-SHA224"", ""1.2.840.10045.4.3.1""" 4
.el .IP "``\s-1ECDSA\-SHA2\-224'', ``ECDSA\-SHA224'',\s0 ``ecdsa\-with\-SHA224'', ``1.2.840.10045.4.3.1''" 4
.IX Item "ECDSA-SHA2-224, ECDSA-SHA224, ecdsa-with-SHA224, 1.2.840.10045.4.3.1"
.ie n .IP """\s-1ECDSA\-SHA2\-256"", ""ECDSA\-SHA256"",\s0 ""ecdsa\-with\-SHA256"", ""1.2.840.10045.4.3.2""" 4
.el .IP "``\s-1ECDSA\-SHA2\-256'', ``ECDSA\-SHA256'',\s0 ``ecdsa\-with\-SHA256'', ``1.2.840.10045.4.3.2''" 4
.IX Item "ECDSA-SHA2-256, ECDSA-SHA256, ecdsa-with-SHA256, 1.2.840.10045.4.3.2"
.ie n .IP """\s-1ECDSA\-SHA2\-384"", ""ECDSA\-SHA384"",\s0 ""ecdsa\-with\-SHA384"", ""1.2.840.10045.4.3.3""" 4
.el .IP "``\s-1ECDSA\-SHA2\-384'', ``ECDSA\-SHA384'',\s0 ``ecdsa\-with\-SHA384'', ``1.2.840.10045.4.3.3''" 4
.IX Item "ECDSA-SHA2-384, ECDSA-SHA384, ecdsa-with-SHA384, 1.2.840.10045.4.3.3"
.ie n .IP """\s-1ECDSA\-SHA2\-512"", ""ECDSA\-SHA512"",\s0 ""ecdsa\-with\-SHA512"", ""1.2.840.10045.4.3.4""" 4
.el .IP "``\s-1ECDSA\-SHA2\-512'', ``ECDSA\-SHA512'',\s0 ``ecdsa\-with\-SHA512'', ``1.2.840.10045.4.3.4''" 4
.IX Item "ECDSA-SHA2-512, ECDSA-SHA512, ecdsa-with-SHA512, 1.2.840.10045.4.3.4"
.ie n .IP """\s-1ECDSA\-SHA3\-224"",\s0 ""ecdsa_with_SHA3\-224"", ""id\-ecdsa\-with\-sha3\-224"", ""2.16.840.1.101.3.4.3.9""" 4
.el .IP "``\s-1ECDSA\-SHA3\-224'',\s0 ``ecdsa_with_SHA3\-224'', ``id\-ecdsa\-with\-sha3\-224'', ``2.16.840.1.101.3.4.3.9''" 4
.IX Item "ECDSA-SHA3-224, ecdsa_with_SHA3-224, id-ecdsa-with-sha3-224, 2.16.840.1.101.3.4.3.9"
.ie n .IP """\s-1ECDSA\-SHA3\-256"",\s0 ""ecdsa_with_SHA3\-256"", ""id\-ecdsa\-with\-sha3\-256"", ""2.16.840.1.101.3.4.3.10""" 4
.el .IP "``\s-1ECDSA\-SHA3\-256'',\s0 ``ecdsa_with_SHA3\-256'', ``id\-ecdsa\-with\-sha3\-256'', ``2.16.840.1.101.3.4.3.10''" 4
.IX Item "ECDSA-SHA3-256, ecdsa_with_SHA3-256, id-ecdsa-with-sha3-256, 2.16.840.1.101.3.4.3.10"
.ie n .IP """\s-1ECDSA\-SHA3\-384"",\s0 ""ecdsa_with_SHA3\-384"", ""id\-ecdsa\-with\-sha3\-384"", ""2.16.840.1.101.3.4.3.11""" 4
.el .IP "``\s-1ECDSA\-SHA3\-384'',\s0 ``ecdsa_with_SHA3\-384'', ``id\-ecdsa\-with\-sha3\-384'', ``2.16.840.1.101.3.4.3.11''" 4
.IX Item "ECDSA-SHA3-384, ecdsa_with_SHA3-384, id-ecdsa-with-sha3-384, 2.16.840.1.101.3.4.3.11"
.ie n .IP """\s-1ECDSA\-SHA3\-512"",\s0 ""ecdsa_with_SHA3\-512"", ""id\-ecdsa\-with\-sha3\-512"", ""2.16.840.1.101.3.4.3.12""" 4
.el .IP "``\s-1ECDSA\-SHA3\-512'',\s0 ``ecdsa_with_SHA3\-512'', ``id\-ecdsa\-with\-sha3\-512'', ``2.16.840.1.101.3.4.3.12''" 4
.IX Item "ECDSA-SHA3-512, ecdsa_with_SHA3-512, id-ecdsa-with-sha3-512, 2.16.840.1.101.3.4.3.12"
.PD
\&\s-1ECDSA\s0 signature schemes with diverse message digest algorithms.  They are all
supported explicitly fetched with \fBEVP_PKEY_sign_init_ex2\fR\|(3) and
\&\fBEVP_PKEY_sign_message_init\fR\|(3).
.SS "\s-1ECDSA\s0 Signature Parameters"
.IX Subsection "ECDSA Signature Parameters"
The following signature parameters can be set using \fBEVP_PKEY_CTX_set_params()\fR.
This may be called after \fBEVP_PKEY_sign_init()\fR or \fBEVP_PKEY_verify_init()\fR,
and before calling \fBEVP_PKEY_sign()\fR or \fBEVP_PKEY_verify()\fR.
.ie n .IP """digest"" (\fB\s-1OSSL_SIGNATURE_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``digest'' (\fB\s-1OSSL_SIGNATURE_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "digest (OSSL_SIGNATURE_PARAM_DIGEST) <UTF8 string>"
.PD 0
.ie n .IP """properties"" (\fB\s-1OSSL_SIGNATURE_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``properties'' (\fB\s-1OSSL_SIGNATURE_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "properties (OSSL_SIGNATURE_PARAM_PROPERTIES) <UTF8 string>"
.PD
These two are not supported with the \s-1ECDSA\s0 signature schemes that already
include a message digest algorithm, See \*(L"Algorithm Names\*(R" above.
.ie n .IP """nonce-type"" (\fB\s-1OSSL_SIGNATURE_PARAM_NONCE_TYPE\s0\fR) <unsigned integer>" 4
.el .IP "``nonce-type'' (\fB\s-1OSSL_SIGNATURE_PARAM_NONCE_TYPE\s0\fR) <unsigned integer>" 4
.IX Item "nonce-type (OSSL_SIGNATURE_PARAM_NONCE_TYPE) <unsigned integer>"
.PD 0
.ie n .IP """key-check"" (\fB\s-1OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK\s0\fR) <integer>" 4
.el .IP "``key-check'' (\fB\s-1OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK\s0\fR) <integer>" 4
.IX Item "key-check (OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK) <integer>"
.ie n .IP """digest-check"" (\fB\s-1OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK\s0\fR) <integer>" 4
.el .IP "``digest-check'' (\fB\s-1OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK\s0\fR) <integer>" 4
.IX Item "digest-check (OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK) <integer>"
.PD
These parameters are described in \fBprovider\-signature\fR\|(7).
.PP
The following signature parameters can be retrieved using
\&\fBEVP_PKEY_CTX_get_params()\fR.
.ie n .IP """algorithm-id"" (\fB\s-1OSSL_SIGNATURE_PARAM_ALGORITHM_ID\s0\fR) <octet string>" 4
.el .IP "``algorithm-id'' (\fB\s-1OSSL_SIGNATURE_PARAM_ALGORITHM_ID\s0\fR) <octet string>" 4
.IX Item "algorithm-id (OSSL_SIGNATURE_PARAM_ALGORITHM_ID) <octet string>"
.PD 0
.ie n .IP """digest"" (\fB\s-1OSSL_SIGNATURE_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``digest'' (\fB\s-1OSSL_SIGNATURE_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "digest (OSSL_SIGNATURE_PARAM_DIGEST) <UTF8 string>"
.ie n .IP """nonce-type"" (\fB\s-1OSSL_SIGNATURE_PARAM_NONCE_TYPE\s0\fR) <unsigned integer>" 4
.el .IP "``nonce-type'' (\fB\s-1OSSL_SIGNATURE_PARAM_NONCE_TYPE\s0\fR) <unsigned integer>" 4
.IX Item "nonce-type (OSSL_SIGNATURE_PARAM_NONCE_TYPE) <unsigned integer>"
.ie n .IP """fips-indicator"" (\fB\s-1OSSL_SIGNATURE_PARAM_FIPS_APPROVED_INDICATOR\s0\fR) <integer>" 4
.el .IP "``fips-indicator'' (\fB\s-1OSSL_SIGNATURE_PARAM_FIPS_APPROVED_INDICATOR\s0\fR) <integer>" 4
.IX Item "fips-indicator (OSSL_SIGNATURE_PARAM_FIPS_APPROVED_INDICATOR) <integer>"
.ie n .IP """verify-message"" (\fB\s-1OSSL_SIGNATURE_PARAM_FIPS_VERIFY_MESSAGE\s0\fR <integer>" 4
.el .IP "``verify-message'' (\fB\s-1OSSL_SIGNATURE_PARAM_FIPS_VERIFY_MESSAGE\s0\fR <integer>" 4
.IX Item "verify-message (OSSL_SIGNATURE_PARAM_FIPS_VERIFY_MESSAGE <integer>"
.PD
The parameters are described in \fBprovider\-signature\fR\|(7).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_PKEY_CTX_set_params\fR\|(3),
\&\fBEVP_PKEY_sign\fR\|(3),
\&\fBEVP_PKEY_verify\fR\|(3),
\&\fBprovider\-signature\fR\|(7),
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2020\-2024 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (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>.
