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.\" $NetBSD: EVP_SIGNATURE-ECDSA.7,v 1.5 2026/04/08 17:06:44 christos Exp $
.\"
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.IX Title "EVP_SIGNATURE-ECDSA 7"
.TH EVP_SIGNATURE-ECDSA 7 2026-04-07 3.5.6 OpenSSL
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH NAME
EVP_SIGNATURE\-ECDSA \- The EVP_PKEY ECDSA signature implementation
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Support for computing ECDSA signatures.
See \fBEVP_PKEY\-EC\fR\|(7) for information related to EC 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 OID in canonical
decimal form (which means that they are possible to fetch if the caller has a
mere OID which came out in this form after a call to \fBOBJ_obj2txt\fR\|(3)).
.IP """ECDSA""" 4
.IX Item """ECDSA"""
The base signature algorithm, supported explicitly fetched with
\&\fBEVP_PKEY_sign_init_ex2\fR\|(3), and implicitly fetched (through
EC keys) with \fBEVP_DigestSignInit\fR\|(3) and
\&\fBEVP_DigestVerifyInit\fR\|(3).
.Sp
It can\*(Aqt be used with \fBEVP_PKEY_sign_message_init\fR\|(3)
.IP """ECDSA\-SHA1"", ""ECDSA\-SHA\-1"", ""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
.IP """ECDSA\-SHA2\-224"", ""ECDSA\-SHA224"", ""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"""
.IP """ECDSA\-SHA2\-256"", ""ECDSA\-SHA256"", ""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"""
.IP """ECDSA\-SHA2\-384"", ""ECDSA\-SHA384"", ""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"""
.IP """ECDSA\-SHA2\-512"", ""ECDSA\-SHA512"", ""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"""
.IP """ECDSA\-SHA3\-224"", ""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"""
.IP """ECDSA\-SHA3\-256"", ""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"""
.IP """ECDSA\-SHA3\-384"", ""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"""
.IP """ECDSA\-SHA3\-512"", ""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
ECDSA 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 "ECDSA 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.
.IP """digest"" (\fBOSSL_SIGNATURE_PARAM_DIGEST\fR) <UTF8 string>" 4
.IX Item """digest"" (OSSL_SIGNATURE_PARAM_DIGEST) <UTF8 string>"
.PD 0
.IP """properties"" (\fBOSSL_SIGNATURE_PARAM_PROPERTIES\fR) <UTF8 string>" 4
.IX Item """properties"" (OSSL_SIGNATURE_PARAM_PROPERTIES) <UTF8 string>"
.PD
These two are not supported with the ECDSA signature schemes that already
include a message digest algorithm, See "Algorithm Names" above.
.IP """nonce\-type"" (\fBOSSL_SIGNATURE_PARAM_NONCE_TYPE\fR) <unsigned integer>" 4
.IX Item """nonce-type"" (OSSL_SIGNATURE_PARAM_NONCE_TYPE) <unsigned integer>"
.PD 0
.IP """key\-check"" (\fBOSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK\fR) <integer>" 4
.IX Item """key-check"" (OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK) <integer>"
.IP """digest\-check"" (\fBOSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK\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.
.IP """algorithm\-id"" (\fBOSSL_SIGNATURE_PARAM_ALGORITHM_ID\fR) <octet string>" 4
.IX Item """algorithm-id"" (OSSL_SIGNATURE_PARAM_ALGORITHM_ID) <octet string>"
.PD 0
.IP """digest"" (\fBOSSL_SIGNATURE_PARAM_DIGEST\fR) <UTF8 string>" 4
.IX Item """digest"" (OSSL_SIGNATURE_PARAM_DIGEST) <UTF8 string>"
.IP """nonce\-type"" (\fBOSSL_SIGNATURE_PARAM_NONCE_TYPE\fR) <unsigned integer>" 4
.IX Item """nonce-type"" (OSSL_SIGNATURE_PARAM_NONCE_TYPE) <unsigned integer>"
.IP """fips\-indicator"" (\fBOSSL_SIGNATURE_PARAM_FIPS_APPROVED_INDICATOR\fR) <integer>" 4
.IX Item """fips-indicator"" (OSSL_SIGNATURE_PARAM_FIPS_APPROVED_INDICATOR) <integer>"
.IP """verify\-message"" (\fBOSSL_SIGNATURE_PARAM_FIPS_VERIFY_MESSAGE\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\-2026 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
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