File: gnupg.info,  Node: GPGSM DECRYPT,  Next: GPGSM SIGN,  Prev: GPGSM ENCRYPT,  Up: GPGSM Protocol

5.6.2 Decrypting a message
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Input and output FDs are set the same way as in encryption, but 'INPUT'
refers to the ciphertext and 'OUTPUT' to the plaintext.  There is no
need to set recipients.  'GPGSM' automatically strips any S/MIME headers
from the input, so it is valid to pass an entire MIME part to the INPUT
pipe.

   The decryption is done by using the command

       DECRYPT

   It performs the decrypt operation after doing some check on the
internal state (e.g.  that all needed data has been set).  Because it
utilizes the GPG-Agent for the session key decryption, there is no need
to ask the client for a protecting passphrase - GpgAgent takes care of
this by requesting this from the user.