The following signature parameters can be retrieved using EVP_PKEY_CTX_get_params().
When calling EVP_DigestSignInit() or EVP_DigestVerifyInit(), the digest type parameter MUST be set to NULL.
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 EVP_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 EVP_PKEY_new_raw_public_key(3) or loaded from a SubjectPublicKeyInfo structure in a PEM 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.
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); }
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>.