jrihtarsic commented on code in PR #298:
URL: https://github.com/apache/ws-wss4j/pull/298#discussion_r1531896178
##########
ws-security-dom/src/main/java/org/apache/wss4j/dom/message/WSSecEncryptedKey.java:
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@@ -561,6 +581,56 @@ private KeyAgreementParameters
buildKeyAgreementParameter(PublicKey recipientPub
return dhSpec;
}
+ /**
+ * Method builds the KeyDerivationParameters for keyDerivationMethod and
default values. The default values for
+ * the key derivation method are:
+ * <ul>
+ * <li>ConcatKDF
+ * <ul>
+ * <li> DigestAlgorithm:
"http://www.w3.org/2001/04/xmlenc#sha256";</li>
+ * <li> AlgorithmID: "0000"</li>
+ * <li> PartyUInfo: ""</li>
+ * <li> PartyVInfo: ""</li>
+ * <li> SuppPubInfo: null</li>
+ * <li> SuppPrivInfo: null</li>
+ * </ul>
+ * <li>HKDF: SHA-256
+ * <ul>
+ * <li> PRF: http://www.w3.org/2001/04/xmldsig-more#hmac-sha256 </li>
+ * <li> Salt: random 256 bit value</li>
+ * <li> Info: null</li>
+ * </ul>
+ * </li>
+ * </ul>
+ *
+ * @param keyBitLength the length of the derived key in bits
+ * @return KeyDerivationParameters the {@link KeyDerivationParameters} for
generating the
+ * key for encrypting transport key and generating XML elements.
+ * @throws WSSecurityException if the KeyDerivationParameters cannot be
created
+ */
+ private KeyDerivationParameters buildKeyDerivationParameters(int
keyBitLength) throws WSSecurityException {
+
+ switch (keyDerivationMethod) {
+ case WSS4JConstants.KEYDERIVATION_CONCATKDF:
+ return
XMLCipherUtil.constructConcatKeyDerivationParameter(keyBitLength,
WSConstants.SHA256,
+ "0000", "", "", null, null);
+ case WSS4JConstants.KEYDERIVATION_HKDF:
+ // use semi random value for salt.
+ // rfc5869: Yet, even a salt value of less quality (shorter in
+ // size or with limited entropy) may still make a significant
+ // contribution to the security of the output keying material
+ byte[] semiRandom = new byte[keyBitLength / 8];
+ new Random().nextBytes(semiRandom);
Review Comment:
In this particular case the SecureRandom does not significantly enhance
cryptographic security but does impact performance.
The Random is most optimal choice for most use cases with HKDF.
However, if a user requires stronger cryptographic security for HKDF salt,
they can provide their own value using keyDerivationParameters.”
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