CheckPassword checks to see if the password matches the hashed password.

Decrypt decrypts data using 256-bit AES-GCM.

Encrypt encrypts data using 256-bit AES-GCM.

Hmac key随意设置 data 要加密数据.

PKCS7Padding 补码.

PKCS7UnPadding 去码.

SecureKey generates a random 256-bit key for Encrypt() and Decrypt().

SecureToken create a new random token.