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#ifndef _IPXE_DES_H
#define _IPXE_DES_H
/** @file
*
* DES algorithm
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/crypto.h>
/** A DES 32-bit dword value
*
* DES views data as 64-bit big-endian values, typically handled as a
* most-significant "left" half and a least-significant "right" half.
*/
union des_dword {
/** Raw bytes */
uint8_t byte[4];
/** 32-bit big-endian dword */
uint32_t dword;
};
/** A DES 64-bit block */
union des_block {
/** Raw bytes */
uint8_t byte[8];
/** 32-bit big-endian dwords */
uint32_t dword[2];
/** Named left and right halves */
struct {
/** Left (most significant) half */
union des_dword left;
/** Right (least significant) half */
union des_dword right;
};
/** Named "C" and "D" halves */
struct {
/** "C" (most significant) half */
union des_dword c;
/** "D" (least significant) half */
union des_dword d;
};
};
/** DES blocksize */
#define DES_BLOCKSIZE sizeof ( union des_block )
/** A DES round key
*
* A DES round key is a 48-bit value, consumed as 8 groups of 6 bits.
* We store these as 8 separate bytes, for simplicity of consumption.
*/
union des_round_key {
/** Raw bytes */
uint8_t byte[8];
/** 32-bit big-endian dwords */
uint32_t dword[2];
/** 6-bit step key byte
*
* There are 8 steps within a DES round (one step per S-box).
* Each step requires six bits of the round key.
*
* As an optimisation, we store the least significant of the 6
* bits in the sign bit of a signed 8-bit value, and the
* remaining 5 bits in the least significant 5 bits of the
* 8-bit value. See the comments in des_sbox() for further
* details.
*/
int8_t step[8];
};
/** Number of DES rounds */
#define DES_ROUNDS 16
/** DES context */
struct des_context {
/** Round keys */
union des_round_key rkey[DES_ROUNDS];
};
/** DES context size */
#define DES_CTX_SIZE sizeof ( struct des_context )
extern struct cipher_algorithm des_algorithm;
extern struct cipher_algorithm des_ecb_algorithm;
extern struct cipher_algorithm des_cbc_algorithm;
#endif /* _IPXE_DES_H */
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