CryptoSys API Library Manual
cipherStreamHex
Encipher data in a hex-encoded string using specified stream cipher.
Syntax
[VBA]
Public Function cipherStreamHex ( _
szInputHex As String, _
szKeyHex As String, _
szIvHex As String, _
nOptions As Long, _
Optional nCounter As Long = 0 _
) As String
Parameters
- szInputHex
- Hex-encoded input data.
- szKeyHex
- Hex-encoded key.
- szIvHex
- Hex-encoded Initialization Vector (IV, nonce). Use "" for Arcfour.
- nOptions
- Algorithm to be used. Select one from:
API_SC_ARCFOUR
API_SC_SALSA20
API_SC_CHACHA20
- nCounter
- Counter value for ChaCha20 only, otherwise ignored.
Return Value
String: Ciphertext in hex-encoded string or empty string on error.
Remarks
Arcfour: any length key; specify "" for IV.
Salsa20: key must be exactly 16 or 32 bytes and IV exactly 8 bytes long.
ChaCha20: key must be exactly 16 or 32 bytes and IV exactly 8, 12, or 16 bytes long. Counter is ignored if IV is 16 bytes.
Note different order of parameters from core function.
Example
Debug.Print cipherStreamHex("00000000000000000000", "ef012345", "", API_SC_ARCFOUR)