NAME

       kcapi_cipher_stream_init_dec - start a decryption operation (stream)

SYNOPSIS

       ssize_t kcapi_cipher_stream_init_dec(struct kcapi_handle * handle, const uint8_t * iv,
                                            struct iovec * iov, size_t iovlen);

ARGUMENTS

       handle
           [in] cipher handle

       iv
           [in] IV to be used for cipher operation

       iov
           [in] scatter/gather list with data to be encrypted. This is the pointer to the first
           iov entry if an array of iov entries is supplied. See sendmsg(2) for details on how
           iov is to be used. This pointer may be NULL if no data to be encrypted is available at
           the point of the call.

       iovlen
           [in] number of scatter/gather list elements. If iov is NULL, this value must be zero.

DESCRIPTION

       A stream decryption operation is started with this call. Multiple successive
       kcapi_cipher_stream_update function calls can be invoked to send more ciphertext data to
       be decrypted. The kernel buffers the input until kcapi_cipher_stream_op picks up the
       decrypted data. Once ciphertext is decrypted during the kcapi_cipher_stream_op it is
       removed from the kernel buffer.

       The function calls of kcapi_cipher_stream_update and kcapi_cipher_stream_op can be mixed,
       even by multiple threads of an application.

       The IV buffer must be exactly kcapi_cipher_ivsize bytes in size.

       return number of bytes sent to the kernel upon success; a negative errno-style error code
       if an error occurred

AUTHOR

       Stephan Mueller <smueller@chronox.de>
           Author.

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