Key Property
The secret key for the symmetric algorithm.
Syntax
property Key: String read get_Key write set_Key; property KeyB: TBytes read get_KeyB write set_KeyB;
Default Value
''
Remarks
This secret key is used both for encryption and decryption. The secret key should be known only to the sender and the receiver. The legal key size varies depending on the algorithm.
If this property is left empty and KeyPassword is specified, a Key value will be generated by the component as necessary.
Legal Key and Block Sizes (in bits)
| AES | Rijndael | CAST | DES | IDEA | RC2 | RC4 | TripleDES | Blowfish | Twofish | TEA | |
| Minimum Key Size | 128 | 128 | 112 | 64 | 128 | 112 | 112 | 128 | 112 | 128 | 128 |
| Maximum Key Size | 256 | 256 | 128 | 64 | 128 | 128 | 2048 | 192 | 448 | 256 | 128 |
| Key Size Step | 64 | 64 | 8 | 0 | 0 | 8 | 8 | 64 | 1 | 8 | 0 |
| Block Size | 128 | 128/192/256 | 64 | 64 | 64 | 64 | N/A | 64 | 64 | 128 | 64* |
Note: When using TEA if Algorithm is set to XXTEA valid block sizes are 64 + n * 32. Where n is any positive integer.
The default KeySize is the Maximum Key Size.