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Title "X25519 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
X25519, X448 \- EVP_PKEY X25519 and X448 support Header "DESCRIPTION" The X25519 and X448 \s-1EVP_PKEY\s0 implementation supports key generation and key derivation using X25519 and X448. It has associated private and public key formats compatible with \s-1RFC 8410.\s0

No additional parameters can be set during key generation.

The peer public key must be set using EVP_PKEY_derive_set_peer() when performing key derivation.

Header "NOTES" A context for the X25519 algorithm can be obtained by calling:

.Vb 1 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL); .Ve

For the X448 algorithm a context can be obtained by calling:

.Vb 1 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X448, NULL); .Ve

X25519 or X448 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.

X25519 or X448 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).

Header "EXAMPLES" This example generates an X25519 private key and writes it to standard output in \s-1PEM\s0 format:

.Vb 9 #include <openssl/evp.h> #include <openssl/pem.h> ... EVP_PKEY *pkey = NULL; EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL); EVP_PKEY_keygen_init(pctx); EVP_PKEY_keygen(pctx, &pkey); EVP_PKEY_CTX_free(pctx); PEM_write_PrivateKey(stdout, pkey, NULL, NULL, 0, NULL, NULL); .Ve

The key derivation example in EVP_PKEY_derive\|(3) can be used with \fBX25519 and X448.

Header "SEE ALSO" \fBEVP_PKEY_CTX_new\|(3), \fBEVP_PKEY_keygen\|(3), \fBEVP_PKEY_derive\|(3), \fBEVP_PKEY_derive_set_peer\|(3) Header "COPYRIGHT" Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (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>.