RFR: 8331008: KDF Implementation

[Jamil Nimeh]

On Tue, 23 Apr 2024 20:42:51 GMT, Kevin Driver <kdriver at openjdk.org> wrote:

> Introduce an API for Key Derivation Functions (KDFs), which are cryptographic algorithms for deriving additional keys from a secret key and other data. See [JEP 478](https://openjdk.org/jeps/478).

src/java.base/share/classes/com/sun/crypto/provider/HkdfKeyDerivation.java line 370:

> 368:         }
> 369:         int rounds = (outLen + hmacLen - 1) / hmacLen;
> 370:         kdfOutput = new byte[rounds * hmacLen];

Are we missing a check to ensure that the `outLen` parameter is less than or equal to 255 * HashLen?  See RFC 5869 sec. 2.3.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18924#discussion_r1594617681