[cconlon]

This PR matches SunJCE behavior for AES Key Wrap Ciphers (AESWrap, AES/KW/*), fixing the OpenJDK NISTWrapKAT test on wolfJCE:

• On Java 17+, getIV() returns the RFC 3394 default IV (A6A6A6A6A6A6A6A6) after init(), and getParameters() returns it before and after init(), like SunJCE. Java 8-16 still return null unless an IV was set, since older SunJCE rejects all AES Key Wrap parameters.
• update() returns null instead of an empty array, like SunJCE.
• Adds WolfCryptUtil.getJavaVersion(), which returns 0 on Android or when the version is unknown.
• Updates README_JCE.md and tests, including a getIV() comparison against the running JDK's SunJCE.

[wolfSSL-Fenrir-bot]

Fenrir Automated Review — PR #294

Scan targets checked: wolfcrypt-jni-src, wolfcrypt-jni-bugs
Coverage: 2 of 4 in-scope changed file(s) opened by the reviewer; not opened: src/test/java/com/wolfssl/provider/jce/test/WolfCryptCipherAesWrapTest.java, src/test/java/com/wolfssl/provider/jce/test/WolfCryptUtilTest.java

Fenrir result: Approved ✅

No new issues found in the changed files.

Advisory only — this automated result does not count as a GitHub approval.

Review tier: Lite

[Copilot]

🟢 Approval recommended

The implementation is consistent with the stated compatibility behavior and includes focused regression coverage.

0 open findings

What changed in this PR

Aligns wolfJCE AES Key Wrap IV and update() behavior with SunJCE across supported Java versions.

Changes:

• Reports the RFC 3394 default IV on Java 17+.
• Makes AES Key Wrap update() return null.
• Adds Java-version detection, tests, and documentation.

File	Description
WolfCryptCipher.java	Implements IV reporting and update() behavior.
WolfCryptUtil.java	Adds Java major-version detection.
WolfCryptCipherAesWrapTest.java	Tests IV, parameters, interoperability, and updates.
WolfCryptUtilTest.java	Tests version parsing.
README_JCE.md	Documents version-dependent behavior.

🧠 Review effort: Balanced

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