EVP_SIGNATURE-ECDSA(7ossl)

📦 version 3.5.0, in opensuse-leap 16.0

💅 NAME 💅

Okay bestie, welcome to EVP_SIGNATURE-ECDSA(7ossl) — the manual page for the EVP_PKEY ECDSA signature implementation. This is where ECDSA signatures get their whole moment, and it’s iconic. ✨

🦋 DESCRIPTION 🦋

This page is support for computing ECDSA signatures. For the EC key tea, go see EVP_PKEY-EC(7).

👑 Algorithm Names 👑

In this list, names are grouped together to show they’re the same algorithm with multiple names. The OID is included in canonical decimal form too — which means they’re possible to fetch if the caller has a mere OID that came out in this form after a call to OBJ_obj2txt(3). iykyk. 💅

  • "ECDSA" — the base signature algorithm. It’s supported explicitly fetched with EVP_PKEY_sign_init_ex2(3), and implicitly fetched (through EC keys) with EVP_DigestSignInit(3) and EVP_DigestVerifyInit(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"

These are 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). Slay. 🔥

🎀 ECDSA Signature Parameters 🎀

The following signature parameters can be set using EVP_PKEY_CTX_set_params(). You can call this after EVP_PKEY_sign_init() or EVP_PKEY_verify_init(), and before calling EVP_PKEY_sign() or EVP_PKEY_verify(). No cap.

  • "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>

These parameters are described in provider-signature(7).

🌈 SEE ALSO 🌈

Go peek at these, bestie:

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>.

Mwah 💋 — that’s the EVP_SIGNATURE-ECDSA(7ossl) page from OpenSSL 3.5.0, dated 2026-09-25. Go forth and verify, bestie. 🫶✨

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