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Nitpick: keytool accepts both alias and keypass if specified; if not specified it prompts for key password if needed but defaults alias to mykey. A JCEKS file can be operated on either by keytool or by other code. JCEKS can support three types of entries: privateKey, trustedCert, and secretKey (the older and default JKS file can do the first two). The ...


If you definitely can't use other libraries such as Bouncy Castle, your best option is probably to just add an HMAC authentication tag (it should be easy to write a MacInputStream/MacOutputStream to chain it into your existing pipeline). The primary reason is that the JDK 8 (at least up to 1.8.0_25) GCM implementation suffers from two problems that make it ...


You should get the IV of CBC as the first ciphertext block. Wikipedia: CBC

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