DES crypto functions


Functions
void	DES_set_odd_parity (DES_cblock *key)
int HC_DEPRECATED	DES_check_key_parity (DES_cblock *key)
int	DES_is_weak_key (DES_cblock *key)
int HC_DEPRECATED	DES_set_key (DES_cblock key, DES_key_schedule ks)
int	DES_set_key_unchecked (DES_cblock key, DES_key_schedule ks)
int	DES_set_key_checked (DES_cblock key, DES_key_schedule ks)
int	DES_key_sched (DES_cblock key, DES_key_schedule ks)
void	DES_encrypt (uint32_t u[2], DES_key_schedule *ks, int encp)
void	DES_ecb_encrypt (DES_cblock input, DES_cblock output, DES_key_schedule *ks, int encp)
void	DES_cbc_encrypt (const void in, void out, long length, DES_key_schedule ks, DES_cblock iv, int encp)
void	DES_pcbc_encrypt (const void in, void out, long length, DES_key_schedule ks, DES_cblock iv, int encp)
void	DES_ecb3_encrypt (DES_cblock input, DES_cblock output, DES_key_schedule ks1, DES_key_schedule ks2, DES_key_schedule *ks3, int encp)
void	DES_ede3_cbc_encrypt (const void in, void out, long length, DES_key_schedule ks1, DES_key_schedule ks2, DES_key_schedule ks3, DES_cblock iv, int encp)
void	DES_cfb64_encrypt (const void in, void out, long length, DES_key_schedule ks, DES_cblock iv, int *num, int encp)
uint32_t	DES_cbc_cksum (const void in, DES_cblock output, long length, DES_key_schedule ks, DES_cblock iv)
void	DES_string_to_key (const char str, DES_cblock key)
int HC_DEPRECATED	DES_new_random_key (DES_cblock *key)
void HC_DEPRECATED	DES_init_random_number_generator (DES_cblock *seed)
void HC_DEPRECATED	DES_random_key (DES_cblock *key)

Detailed Description

See the DES - Data Encryption Standard crypto interface for description and examples.

Function Documentation

uint32_t DES_cbc_cksum	(	const void *	in,
		DES_cblock *	output,
		long	length,
		DES_key_schedule *	ks,
		DES_cblock *	iv
	)

Crete a checksum using DES in CBC encryption mode. This mode is only used for Kerberos 4, and it should stay that way.

The IV must always be diffrent for diffrent input data blocks.

Parameters:

	in	data to checksum
	output	the checksum
	length	length of data
	ks	key schedule to use
	iv	initial vector to use

void DES_cbc_encrypt	(	const void *	in,
		void *	out,
		long	length,
		DES_key_schedule *	ks,
		DES_cblock *	iv,
		int	encp
	)

Encrypt/decrypt a block using DES in Chain Block Cipher mode (cbc).

The IV must always be diffrent for diffrent input data blocks.

Parameters:

	in	data to encrypt
	out	data to encrypt
	length	length of data
	ks	key schedule to use
	iv	initial vector to use
	encp	if non zero, encrypt. if zero, decrypt.

void DES_cfb64_encrypt	(	const void *	in,
		void *	out,
		long	length,
		DES_key_schedule *	ks,
		DES_cblock *	iv,
		int *	num,
		int	encp
	)

Encrypt/decrypt using DES in cipher feedback mode with 64 bit feedback.

The IV must always be diffrent for diffrent input data blocks.

Parameters:

	in	data to encrypt
	out	data to encrypt
	length	length of data
	ks	key schedule to use
	iv	initial vector to use
	num	offset into in cipher block encryption/decryption stop last time.
	encp	if non zero, encrypt. if zero, decrypt.

int HC_DEPRECATED DES_check_key_parity ( DES_cblock * key )

Check if the key have correct parity.

Parameters:

key

key to check the parity.

Returns:: 1 on success, 0 on failure.

void DES_ecb3_encrypt	(	DES_cblock *	input,
		DES_cblock *	output,
		DES_key_schedule *	ks1,
		DES_key_schedule *	ks2,
		DES_key_schedule *	ks3,
		int	encp
	)

Encrypt/decrypt a block using triple DES using EDE mode, encrypt/decrypt/encrypt.

Parameters:

	input	data to encrypt
	output	data to encrypt
	ks1	key schedule to use
	ks2	key schedule to use
	ks3	key schedule to use
	encp	if non zero, encrypt. if zero, decrypt.

void DES_ecb_encrypt	(	DES_cblock *	input,
		DES_cblock *	output,
		DES_key_schedule *	ks,
		int	encp
	)

Encrypt/decrypt a block using DES.

Parameters:

	input	data to encrypt
	output	data to encrypt
	ks	key schedule to use
	encp	if non zero, encrypt. if zero, decrypt.

void DES_ede3_cbc_encrypt	(	const void *	in,
		void *	out,
		long	length,
		DES_key_schedule *	ks1,
		DES_key_schedule *	ks2,
		DES_key_schedule *	ks3,
		DES_cblock *	iv,
		int	encp
	)

Encrypt/decrypt using Triple DES in Chain Block Cipher mode (cbc).

The IV must always be diffrent for diffrent input data blocks.

Parameters:

	in	data to encrypt
	out	data to encrypt
	length	length of data
	ks1	key schedule to use
	ks2	key schedule to use
	ks3	key schedule to use
	iv	initial vector to use
	encp	if non zero, encrypt. if zero, decrypt.

void DES_encrypt	(	uint32_t	u[2],
		DES_key_schedule *	ks,
		int	encp
	)

Encrypt/decrypt a block using DES. Also called ECB mode

Parameters:

	u	data to encrypt
	ks	key schedule to use
	encp	if non zero, encrypt. if zero, decrypt.

void HC_DEPRECATED DES_init_random_number_generator ( DES_cblock * seed )

Seed the random number generator. Deprecated, use RAND - random number

Parameters:

seed

a seed to seed that random number generate with.

int DES_is_weak_key ( DES_cblock * key )

Checks if the key is any of the weaks keys that makes DES attacks trival.

Parameters:

key

key to check.

Returns:: 1 if the key is weak, 0 otherwise.

int DES_key_sched	(	DES_cblock *	key,
		DES_key_schedule *	ks
	)

Compatibility function for eay libdes, works just like DES_set_key_checked().

Parameters:

	key	a key to initialize the key schedule with.
	ks	a key schedule to initialize.

Returns:: 0 on success, -1 on invalid parity, -2 on weak key.

int HC_DEPRECATED DES_new_random_key ( DES_cblock * key )

Generate a random des key using a random block, fixup parity and skip weak keys.

Parameters:

key

is set to a random key.

Returns:: 0 on success, non zero on random number generator failure.

void DES_pcbc_encrypt	(	const void *	in,
		void *	out,
		long	length,
		DES_key_schedule *	ks,
		DES_cblock *	iv,
		int	encp
	)

Encrypt/decrypt a block using DES in Propagating Cipher Block Chaining mode. This mode is only used for Kerberos 4, and it should stay that way.

The IV must always be diffrent for diffrent input data blocks.

Parameters:

	in	data to encrypt
	out	data to encrypt
	length	length of data
	ks	key schedule to use
	iv	initial vector to use
	encp	if non zero, encrypt. if zero, decrypt.

void HC_DEPRECATED DES_random_key ( DES_cblock * key )

Generate a random key, deprecated since it doesn't return an error code, use DES_new_random_key().

Parameters:

key

is set to a random key.

int HC_DEPRECATED DES_set_key	(	DES_cblock *	key,
		DES_key_schedule *	ks
	)

Setup a des key schedule from a key. Deprecated function, use DES_set_key_unchecked() or DES_set_key_checked() instead.

Parameters:

	key	a key to initialize the key schedule with.
	ks	a key schedule to initialize.

Returns:: 0 on success

int DES_set_key_checked	(	DES_cblock *	key,
		DES_key_schedule *	ks
	)

Just like DES_set_key_unchecked() except checking that the key is not weak for or have correct parity.

Parameters:

	key	a key to initialize the key schedule with.
	ks	a key schedule to initialize.

Returns:: 0 on success, -1 on invalid parity, -2 on weak key.

int DES_set_key_unchecked	(	DES_cblock *	key,
		DES_key_schedule *	ks
	)

Setup a des key schedule from a key. The key is no longer needed after this transaction and can cleared.

Does NOT check that the key is weak for or have wrong parity.

Parameters:

	key	a key to initialize the key schedule with.
	ks	a key schedule to initialize.

Returns:: 0 on success

void DES_set_odd_parity ( DES_cblock * key )

Set the parity of the key block, used to generate a des key from a random key. See DES key generation.

Parameters:

key

key to fixup the parity for.

void DES_string_to_key	(	const char *	str,
		DES_cblock *	key
	)

Convert a string to a DES key. Use something like PKCS5_PBKDF2_HMAC_SHA1() to create key from passwords.

Parameters:

	str	The string to convert to a key
	key	the resulting key

DES crypto functions

Functions

Detailed Description

Function Documentation