Cipher (gb.openssl)
This class wraps the cipher (block and stream) algorithms of OpenSSL. See
Wikipedia: Ciphers for a start on ciphers.
This class is static.
This class acts like a
read-only static array.
IsSupported
Checks if the cipher method
Method is supported by the OpenSSL library installed on the system.
En- and decryption is done using the Cipher class. First, you have to settle
on a cipher, say AES256 in CBC mode. You can get a list of ciphers that your
local openssl supports from Cipher.List. You'll see that "AES-256-CBC" is a
supported method (I suppose virtually everywhere). You use this string as an
index into the Cipher class to get a .Cipher.Method object which can do en-
and decryption, see . For example:
Use "gb.openssl" 'For Gambas Script Only
Public Sub Main()
Dim sCipher, sData As String
sCipher = Cipher["AES-256-CBC"].EncryptSalted("Hello there", "secret")
Print "Cipher text (base64):";; Base64$(sCipher)
sData = Cipher["AES-256-CBC"].DecryptSalted(sCipher, "secret")
Print "Decrypted:";; sData
Try Cipher["AES-256-CBC"].DecryptSalted(sCipher, "wrong")
If Error Then Print "ERROR:";; Error.Text
End
Cipher text (base64): U2FsdGVkX1+j36HLTJVWjG2ciDw2ZOk/dhbdB7aiTOg=
Decrypted: Hello there
ERROR: Decryption failed