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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.security.hpke;
import com.yahoo.security.ArrayUtils;
/**
* Various internal constants used as part of key derivation etc. in HPKE
*
* @author vekterli
*/
final class Constants {
private static byte[] toBytes(String str) {
return ArrayUtils.toUtf8Bytes(str); // We only expect US-ASCII in practice, so UTF-8 is fine.
}
static final byte[] HPKE_V1_LABEL = toBytes("HPKE-v1");
static final byte[] EMPTY_LABEL = new byte[0];
static final byte[] EAE_PRK_LABEL = toBytes("eae_prk");
static final byte[] SHARED_SECRET_LABEL = toBytes("shared_secret");
/**
* <pre>
* default_psk = ""
* default_psk_id = ""
* </pre>
*/
static final byte[] DEFAULT_PSK = new byte[0];
static final byte[] DEFAULT_PSK_ID = new byte[0];
static final byte[] PSK_ID_HASH_LABEL = toBytes("psk_id_hash");
static final byte[] INFO_HASH_LABEL = toBytes("info_hash");
static final byte[] SECRET_LABEL = toBytes("secret");
static final byte[] KEY_LABEL = toBytes("key");
static final byte[] BASE_NONCE_LABEL = toBytes("base_nonce");
static final byte[] EXP_LABEL = toBytes("exp");
}
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