brp_Crypto_DecryptBuffer()

brp_errcode brp_Crypto_DecryptBuffer	(	brp_protocol	protocol,
		unsigned	KeyIndex,
		brp_buf	KeyValue,
		brp_buf	InitialVector,
		brp_buf	Buffer,
		size_t	Buffer_len,
		brp_buf *	NextInitialVector,
		brp_buf *	UnencryptedBuffer,
		size_t *	UnencryptedBuffer_len,
		brp_mempool *	mempool
	)

This command decrypts a variable length buffer given in the Buffer parameter using the SkipJack algorithm.

If KeyIndex is set to 0x00, KeyValue will be used as encryption key. Otherwise, KeyIndex is interpreted as the index of the corresponding entry in the internal key list. KeyIndex = 0x01 denotes configuration value 0x81, KeyIndex = 0x02 denotes configuration value 0x82, etc.

The value returned in the InitialVector variable is necessary for CBC encryption. If large amounts of data must be encrypted, this command has to be called more than once. In this case, the returned InitialVector variable of call i of the command has to be specified as the InitialVector parameter of call i+1.

Parameters

[in]	protocol	used to execute the command
[in]	KeyIndex	Index of key to use to decrypt data. KeyIndex must be set to 0x00 if a user- defined key, specified in the KeyValue parameter, should be used for decryption.
[in]	KeyValue	If KeyIndex is set to 0x00, this value specifies a user-defined decryption key.
[in]	InitialVector	Initial vector (IV) used for decryption.
[in]	Buffer	Data buffer to decrypt.
[in]	Buffer_len
[out]	NextInitialVector	Initial vector to be used as InitialVector parameter in the next call of this command.
[out]	UnencryptedBuffer	Unencrypted buffer after decryption.
[out]	UnencryptedBuffer_len
[in]	mempool	is used to store response data. Maybe NULL to use an internal mempool, in this case the data is only available until another command uses the internal mempool