Variable AESGCMConst

Remarks

Initialization Vectors must be 12 octets. During encryption, if IV is unspecified, it is constructed with two parts:

1. 64-bit random number, generated each time a private key instance is constructed;
2. 32-bit counter starting from zero.

During decryption, quality of IV is not automatically checked. Since the security of AES-GCM depends on having unique IVs, the application should check IV uniqueness with CounterIvChecker.