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6.6.6 Decrypting data with a Smartcard

To decrypt some data the caller should use the command

 SETDATA hexstring

to tell scdaemon about the data to be decrypted. The data must be given in hex notation. The actual decryption is then done using the command


where keyid is the hexified ID of the key to be used.

If the card is aware of the apdding format a status line with padding information is send before the plaintext data. The key for this status line is PADDING with the only defined value being 0 and meaning padding has been removed.