Constant Time Algorithms for Java

Hi David,

Just working through the Constant Time Algorithms section of the course, I came across an incorrect statement regarding Java library support for it. The name of the Java method that performs constant-time equality checking for digests is MessageDigest::isEqual see https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/security/MessageDigest.html#isEqual(byte[],byte[]) (the page names it equals).

There is also a Google Guava method HashCode::equals whose documentation explicitly states it is intended to protect against timing attacks, see https://github.com/google/guava/blob/master/guava/src/com/google/common/hash/HashCode.java#L371.

Best regards,

Simon