xhdcp22_common.h File Reference

Overview

This file contains common functions shared between HDCP22 drivers.

 MODIFICATION HISTORY:

 Ver   Who  Date     Changes



 1.00  MH   10/30/15 First Release.
 1.01  MH   01/15/16 Added prefix to function names.

Functions
void	XHdcp22Cmn_Sha256Hash (const u8 *Data, u32 DataSize, u8 *HashedData)
	This function computes a SHA256 hash on a array of data. More...
int	XHdcp22Cmn_HmacSha256Hash (const u8 *Data, int DataSize, const u8 *Key, int KeySize, u8 *HashedData)
	This function does a HMAC_SHA256 transform: SHA256(K XOR opad, SHA256(K XOR ipad, text)) More...
void	XHdcp22Cmn_Aes128Encrypt (const u8 *Data, const u8 *Key, u8 *Output)
	This function encrypts 128 bits data with a key of size 128 bits. More...
void	XHdcp22Cmn_Aes128Decrypt (const u8 *Data, const u8 *Key, u8 *Output)
	This function encrypts 128 bits data with a key of size 128 bits. More...

Function Documentation

void XHdcp22Cmn_Aes128Decrypt	(	const u8 *	Data,
		const u8 *	Key,
		u8 *	Output
	)

This function encrypts 128 bits data with a key of size 128 bits.

Parameters

Input	is the 16 byte ciphertext
Key	is the user supplied input key
Output	is the 16 byte plaintext

Returns

None.

Note

None.

void XHdcp22Cmn_Aes128Encrypt	(	const u8 *	Data,
		const u8 *	Key,
		u8 *	Output
	)

This function encrypts 128 bits data with a key of size 128 bits.

Parameters

Input	is the 16 byte plaintext
Key	is the user supplied input key
Output	is the 16 byte ciphertext

Returns

None.

Note

None.

int XHdcp22Cmn_HmacSha256Hash	(	const u8 *	Data,
		int	DataSize,
		const u8 *	Key,
		int	KeySize,
		u8 *	HashedData
	)

This function does a HMAC_SHA256 transform: SHA256(K XOR opad, SHA256(K XOR ipad, text))

ipad is the byte 0x36 repeated 64 times opad is the byte 0x5c repeated 64 times and text is the data being protected

Parameters

Data	is the input data.
DataSize	is the size of the data buffer.
Key	is the hash-key to use.
KeySize	is the size of the hash key.
HashedData	is the output of this function.

Returns

- XST_SUCCESS if no errors occured

• XST_FAILURE if the datasize execeeds the size of the local buffer.

Note

None.

References SHA256_SIZE, and XHdcp22Cmn_Sha256Hash().

void XHdcp22Cmn_Sha256Hash	(	const u8 *	Data,
		u32	DataSize,
		u8 *	HashedData
	)

This function computes a SHA256 hash on a array of data.

Parameters

Data	is the data on which a hash is calculated.
DataSize	is the size of the data array..
HashedData	is a 256-bits size hash.

Returns

None.

Note

None.

Referenced by XHdcp22Cmn_HmacSha256Hash().