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+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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+.\"
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+.\" ========================================================================
+.\"
+.IX Title "EVP_KEM-X25519 7ossl"
+.TH EVP_KEM-X25519 7ossl 2026-04-07 3.5.6 OpenSSL
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+EVP_KEM\-X25519, EVP_KEM\-X448
+\&\- EVP_KEM X25519 and EVP_KEM X448 keytype and algorithm support
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+The \fBX25519\fR and <X448> keytype and its parameters are described in
+\&\fBEVP_PKEY\-X25519\fR\|(7).
+See \fBEVP_PKEY_encapsulate\fR\|(3) and \fBEVP_PKEY_decapsulate\fR\|(3) for more info.
+.SS "X25519 and X448 KEM parameters"
+.IX Subsection "X25519 and X448 KEM parameters"
+.IP """operation"" (\fBOSSL_KEM_PARAM_OPERATION\fR)<UTF8 string>" 4
+.IX Item """operation"" (OSSL_KEM_PARAM_OPERATION)<UTF8 string>"
+The OpenSSL X25519 and X448 Key Encapsulation Mechanisms only support the
+following default operation (operating mode):
+.RS 4
+.IP """DHKEM"" (\fBOSSL_KEM_PARAM_OPERATION_DHKEM\fR)" 4
+.IX Item """DHKEM"" (OSSL_KEM_PARAM_OPERATION_DHKEM)"
+The encapsulate function generates an ephemeral keypair. It produces keymaterial
+by doing an X25519 or X448 key exchange using the ephemeral private key and a
+supplied recipient public key. A HKDF operation using the keymaterial and a kem
+context then produces a shared secret. The shared secret and the ephemeral
+public key are returned.
+The decapsulate function uses the recipient private key and the
+ephemeral public key to produce the same keymaterial, which can then be used to
+produce the same shared secret.
+See <https://www.rfc\-editor.org/rfc/rfc9180.html#name\-dh\-based\-kem\-dhkem>
+.RE
+.RS 4
+.Sp
+This can be set using either \fBEVP_PKEY_CTX_set_kem_op()\fR or
+\&\fBEVP_PKEY_CTX_set_params()\fR.
+.RE
+.IP """ikme"" (\fBOSSL_KEM_PARAM_IKME\fR) <octet string>" 4
+.IX Item """ikme"" (OSSL_KEM_PARAM_IKME) <octet string>"
+Used to specify the key material used for generation of the ephemeral key.
+This value should not be reused for other purposes.
+It should have a length of at least 32 for X25519, and 56 for X448.
+If this value is not set, then a random ikm is used.
+.SH "CONFORMING TO"
+.IX Header "CONFORMING TO"
+.IP RFC9180 4
+.IX Item "RFC9180"
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBEVP_PKEY_CTX_set_kem_op\fR\|(3),
+\&\fBEVP_PKEY_encapsulate\fR\|(3),
+\&\fBEVP_PKEY_decapsulate\fR\|(3)
+\&\fBEVP_KEYMGMT\fR\|(3),
+\&\fBEVP_PKEY\fR\|(3),
+\&\fBprovider\-keymgmt\fR\|(7)
+.SH HISTORY
+.IX Header "HISTORY"
+This functionality was added in OpenSSL 3.2.
+.PP
+The \f(CW\*(C`operation\*(C'\fR (operating mode) was a required parameter prior to OpenSSL 3.5.
+As of OpenSSL 3.5, \f(CW\*(C`DHKEM\*(C'\fR is the default operating mode, and no explicit value
+need be specified.
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2022\-2025 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+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>.