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77 lines
3.4 KiB
Java
77 lines
3.4 KiB
Java
/*
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* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import javax.crypto.Cipher;
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import javax.crypto.spec.HPKEParameterSpec;
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import java.nio.charset.StandardCharsets;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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import java.util.Arrays;
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import java.util.HexFormat;
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class PackageSnippets {
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public static void main(String[] args) throws Exception {
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// @start region="hpke-spec-example"
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// Recipient key pair generation
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KeyPairGenerator g = KeyPairGenerator.getInstance("X25519");
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KeyPair kp = g.generateKeyPair();
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// The HPKE sender cipher is initialized with the recipient's public
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// key and an HPKEParameterSpec using specified algorithm identifiers
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// and application-supplied info.
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Cipher senderCipher = Cipher.getInstance("HPKE");
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HPKEParameterSpec ps = HPKEParameterSpec.of(
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HPKEParameterSpec.KEM_DHKEM_X25519_HKDF_SHA256,
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HPKEParameterSpec.KDF_HKDF_SHA256,
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HPKEParameterSpec.AEAD_AES_128_GCM)
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.withInfo(HexFormat.of().parseHex("010203040506"));
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senderCipher.init(Cipher.ENCRYPT_MODE, kp.getPublic(), ps);
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// Retrieve the key encapsulation message (from the KEM step) from
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// the sender.
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byte[] kemEncap = senderCipher.getIV();
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// The HPKE recipient cipher is initialized with its own private key,
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// an HPKEParameterSpec using the same algorithm identifiers as used by
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// the sender, and the key encapsulation message from the sender.
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Cipher recipientCipher = Cipher.getInstance("HPKE");
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HPKEParameterSpec pr = HPKEParameterSpec.of(
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HPKEParameterSpec.KEM_DHKEM_X25519_HKDF_SHA256,
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HPKEParameterSpec.KDF_HKDF_SHA256,
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HPKEParameterSpec.AEAD_AES_128_GCM)
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.withInfo(HexFormat.of().parseHex("010203040506"))
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.withEncapsulation(kemEncap);
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recipientCipher.init(Cipher.DECRYPT_MODE, kp.getPrivate(), pr);
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// Encryption and decryption
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byte[] msg = "Hello World".getBytes(StandardCharsets.UTF_8);
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byte[] ct = senderCipher.doFinal(msg);
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byte[] pt = recipientCipher.doFinal(ct);
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assert Arrays.equals(msg, pt);
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// @end
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}
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}
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