Fix KeyPair.fromSecretSeet on char array #447
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close #445
fromSecretSeed(char[] seed)decodes the seed into a byte array which is eventually passed into EdDSAPrivateKeySpec (defined in a library). EdDSAPrivateKeySpec stores a reference to the byte array in the class definition. So when we clear out the byte array usingArrays.fill(decoded, (byte) 0);it will actually affect EdDSAPrivateKeySpec. Consequently,getSecretSeed()will end up returning the private key corresponding to all zeros instead of the seed.