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EVP_SIGNATURE-ECDSA(7)              OpenSSL             EVP_SIGNATURE-ECDSA(7)


NAME
       EVP_SIGNATURE-ECDSA - The EVP_PKEY ECDSA signature implementation.

DESCRIPTION
       Support for computing ECDSA signatures.  See EVP_PKEY-EC(7) for
       information related to EC keys.

   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
       OBJ_obj2txt(3)).

       "ECDSA"
           The base signature algorithm, supported explicitly fetched with
           EVP_PKEY_sign_init_ex2(3), and implicitly fetched (through EC keys)
           with EVP_DigestSignInit(3) and EVP_DigestVerifyInit(3).

           It can't be used with EVP_PKEY_sign_message_init(3)

       "ECDSA-SHA1", "ECDSA-SHA-1", "ecdsa-with-SHA1", "1.2.840.10045.4.1"
       "ECDSA-SHA2-224", "ECDSA-SHA224", "ecdsa-with-SHA224",
       "1.2.840.10045.4.3.1"
       "ECDSA-SHA2-256", "ECDSA-SHA256", "ecdsa-with-SHA256",
       "1.2.840.10045.4.3.2"
       "ECDSA-SHA2-384", "ECDSA-SHA384", "ecdsa-with-SHA384",
       "1.2.840.10045.4.3.3"
       "ECDSA-SHA2-512", "ECDSA-SHA512", "ecdsa-with-SHA512",
       "1.2.840.10045.4.3.4"
       "ECDSA-SHA3-224", "ecdsa_with_SHA3-224", "id-ecdsa-with-sha3-224",
       "2.16.840.1.101.3.4.3.9"
       "ECDSA-SHA3-256", "ecdsa_with_SHA3-256", "id-ecdsa-with-sha3-256",
       "2.16.840.1.101.3.4.3.10"
       "ECDSA-SHA3-384", "ecdsa_with_SHA3-384", "id-ecdsa-with-sha3-384",
       "2.16.840.1.101.3.4.3.11"
       "ECDSA-SHA3-512", "ecdsa_with_SHA3-512", "id-ecdsa-with-sha3-512",
       "2.16.840.1.101.3.4.3.12"
           ECDSA signature schemes with diverse message digest algorithms.
           They are all supported explicitly fetched with
           EVP_PKEY_sign_init_ex2(3) and EVP_PKEY_sign_message_init(3).

   ECDSA Signature Parameters
       The following signature parameters can be set using
       EVP_PKEY_CTX_set_params().  This may be called after
       EVP_PKEY_sign_init() or EVP_PKEY_verify_init(), and before calling
       EVP_PKEY_sign() or EVP_PKEY_verify().

       "digest" (OSSL_SIGNATURE_PARAM_DIGEST) <UTF8 string>
       "properties" (OSSL_SIGNATURE_PARAM_PROPERTIES) <UTF8 string>
           These two are not supported with the ECDSA signature schemes that
           already include a message digest algorithm, See "Algorithm Names"
           above.

       "nonce-type" (OSSL_SIGNATURE_PARAM_NONCE_TYPE) <unsigned integer>
       "key-check" (OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK) <integer>
       "digest-check" (OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK) <integer>
           These parameters are described in provider-signature(7).

       The following signature parameters can be retrieved using
       EVP_PKEY_CTX_get_params().

       "algorithm-id" (OSSL_SIGNATURE_PARAM_ALGORITHM_ID) <octet string>
       "digest" (OSSL_SIGNATURE_PARAM_DIGEST) <UTF8 string>
       "nonce-type" (OSSL_SIGNATURE_PARAM_NONCE_TYPE) <unsigned integer>
       "fips-indicator" (OSSL_SIGNATURE_PARAM_FIPS_APPROVED_INDICATOR)
       <integer>
       "verify-message" (OSSL_SIGNATURE_PARAM_FIPS_VERIFY_MESSAGE <integer>
           The parameters are described in provider-signature(7).

SEE ALSO
       EVP_PKEY_CTX_set_params(3), EVP_PKEY_sign(3), EVP_PKEY_verify(3),
       provider-signature(7),

COPYRIGHT
       Copyright 2020-2024 The OpenSSL Project Authors. All Rights Reserved.

       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>.

3.5.1                             2025-07-01            EVP_SIGNATURE-ECDSA(7)