question: public void decrypt ( KeyParameter aesKey ) { lock . lock ( ) ; try { checkState ( getEncryptionType ( ) != EncryptionType . UNENCRYPTED , "Wallet is already decrypted" ) ; checkNotNull ( keyCrypter ) ; ArrayList < ECKey > decryptedKeyChain = new ArrayList < ECKey > ( ) ; for ( ECKey key : keychain ) { if ( ! key . isEncrypted ( ) ) { decryptedKeyChain . add ( key ) ; } else { ECKey decryptedECKey = key . decrypt ( keyCrypter , aesKey ) ; decryptedKeyChain . add ( decryptedECKey ) ; } } keychain = decryptedKeyChain ; keyCrypter = null ; extensions . remove ( MultiBitWalletProtobufSerializer . ORG_MULTIBIT_WALLET_PROTECT_2 ) ; } finally { lock . unlock ( ) ; } }
target:  Decrypt the wallet with the wallets keyCrypter and AES key.