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EVP_SIGNATURE-ED25519.7 revision 1.2.2.2

$NetBSD: EVP_SIGNATURE-ED25519.7,v 1.2.2.2 2023/08/11 13:42:06 martin Exp $

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Title "EVP_SIGNATURE-ED25519 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
.nh EVP_SIGNATURE-ED25519, EVP_SIGNATURE-ED448, Ed25519, Ed448 \- EVP_PKEY Ed25519 and Ed448 support Header "DESCRIPTION" The Ed25519 and Ed448 \s-1EVP_PKEY\s0 implementation supports key generation, one-shot digest sign and digest verify using PureEdDSA and Ed25519 or Ed448 (see \s-1RFC8032\s0). It has associated private and public key formats compatible with \s-1RFC 8410.\s0 Subsection "ED25519 and ED448 Signature Parameters" No additional parameters can be set during one-shot signing or verification. In particular, because PureEdDSA is used, a digest must \s-1NOT\s0 be specified when signing or verifying. See \s-1EVP_PKEY-X25519\s0\|(7) for information related to X25519 and X448 keys.

The following signature parameters can be retrieved using \fBEVP_PKEY_CTX_get_params(). Item "algorithm-id (OSSL_SIGNATURE_PARAM_ALGORITHM_ID) <octet string>" The parameters are described in provider-signature\|(7).

Header "NOTES" The PureEdDSA algorithm does not support the streaming mechanism of other signature algorithms using, for example, EVP_DigestUpdate(). The message to sign or verify must be passed using the one-shot \fBEVP_DigestSign() and EVP_DigestVerify() functions.

When calling EVP_DigestSignInit() or EVP_DigestVerifyInit(), the digest type parameter \s-1MUST\s0 be set to \s-1NULL.\s0

Applications wishing to sign certificates (or other structures such as CRLs or certificate requests) using Ed25519 or Ed448 can either use X509_sign() or X509_sign_ctx() in the usual way.

Ed25519 or Ed448 private keys can be set directly using \fBEVP_PKEY_new_raw_private_key\|(3) or loaded from a PKCS#8 private key file using PEM_read_bio_PrivateKey\|(3) (or similar function). Completely new keys can also be generated (see the example below). Setting a private key also sets the associated public key.

Ed25519 or Ed448 public keys can be set directly using \fBEVP_PKEY_new_raw_public_key\|(3) or loaded from a SubjectPublicKeyInfo structure in a \s-1PEM\s0 file using PEM_read_bio_PUBKEY\|(3) (or similar function).

Ed25519 and Ed448 can be tested with the openssl-speed\|(1) application since version 1.1.1. Valid algorithm names are ed25519, ed448 and eddsa. If eddsa is specified, then both Ed25519 and Ed448 are benchmarked.

Header "EXAMPLES" To sign a message using a \s-1ED25519\s0 or \s-1ED448\s0 key:

.Vb 5 void do_sign(EVP_PKEY *ed_key, unsigned char *msg, size_t msg_len) { size_t sig_len; unsigned char *sig = NULL; EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); \& EVP_DigestSignInit(md_ctx, NULL, NULL, NULL, ed_key); /* Calculate the requires size for the signature by passing a NULL buffer */ EVP_DigestSign(md_ctx, NULL, &sig_len, msg, msg_len); sig = OPENSSL_zalloc(sig_len); \& EVP_DigestSign(md_ctx, sig, &sig_len, msg, msg_len); ... OPENSSL_free(sig); EVP_MD_CTX_free(md_ctx); } .Ve

Header "SEE ALSO" \s-1EVP_PKEY-X25519\s0\|(7) \fBprovider-signature\|(7), \fBEVP_DigestSignInit\|(3), \fBEVP_DigestVerifyInit\|(3), Header "COPYRIGHT" Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.

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>.

Indexes created Tue May 05 00:25:04 UTC 2026