Package org.bouncycastle.oldcrypto.macs
This is from some very old version of bouncycastle, part of package org.bouncycastle.crypto. Android bundled something similar in pre-Gingerbread, but upgraded to a later, incompatible version in Gingerbread. As of Java 1.4 these are in javax.crypto - more or less. To avoid having to make two different versions of our Android app, we rename to org.bouncycastle.oldcrypto.
Ref: javax.crypto and this android issue.
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Class Summary Class Description I2PHMac HMAC implementation based on RFC2104 H(K XOR opad, H(K XOR ipad, text)) modified by jrandom to use the session key byte array directly and to cache a frequently used buffer (called on doFinal).