202 lines
6.1 KiB
Groff
202 lines
6.1 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "X25519 7"
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.TH X25519 7 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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X25519,
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X448
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\&\- EVP_PKEY X25519 and X448 support
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBX25519\fR and \fBX448\fR \s-1EVP_PKEY\s0 implementation supports key generation and
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key derivation using \fBX25519\fR and \fBX448\fR. It has associated private and public
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key formats compatible with draft\-ietf\-curdle\-pkix\-03.
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.PP
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No additional parameters can be set during key generation.
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.PP
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The peer public key must be set using \fIEVP_PKEY_derive_set_peer()\fR when
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performing key derivation.
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.SH "NOTES"
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.IX Header "NOTES"
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A context for the \fBX25519\fR algorithm can be obtained by calling:
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.PP
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.Vb 1
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\& EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL);
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.Ve
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.PP
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For the \fBX448\fR algorithm a context can be obtained by calling:
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.PP
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.Vb 1
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\& EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X448, NULL);
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.Ve
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.PP
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X25519 or X448 private keys can be set directly using
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\&\fIEVP_PKEY_new_raw_private_key\fR\|(3) or loaded from a PKCS#8 private key file
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using \fIPEM_read_bio_PrivateKey\fR\|(3) (or similar function). Completely new keys
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can also be generated (see the example below). Setting a private key also sets
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the associated public key.
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.PP
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X25519 or X448 public keys can be set directly using
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\&\fIEVP_PKEY_new_raw_public_key\fR\|(3) or loaded from a SubjectPublicKeyInfo
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structure in a \s-1PEM\s0 file using \fIPEM_read_bio_PUBKEY\fR\|(3) (or similar function).
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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This example generates an \fBX25519\fR private key and writes it to standard
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output in \s-1PEM\s0 format:
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.PP
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.Vb 9
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\& #include <openssl/evp.h>
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\& #include <openssl/pem.h>
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\& ...
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\& EVP_PKEY *pkey = NULL;
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\& EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL);
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\& EVP_PKEY_keygen_init(pctx);
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\& EVP_PKEY_keygen(pctx, &pkey);
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\& EVP_PKEY_CTX_free(pctx);
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\& PEM_write_PrivateKey(stdout, pkey, NULL, NULL, 0, NULL, NULL);
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.Ve
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.PP
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The key derivation example in \fIEVP_PKEY_derive\fR\|(3) can be used with
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\&\fBX25519\fR and \fBX448\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_PKEY_CTX_new\fR\|(3),
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\&\fIEVP_PKEY_keygen\fR\|(3),
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\&\fIEVP_PKEY_derive\fR\|(3),
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\&\fIEVP_PKEY_derive_set_peer\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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