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

DES_cbc_cksum()

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

DES_cbc_encrypt()

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.

DES_cfb64_encrypt()

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.

DES_check_key_parity()

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.

DES_ecb3_encrypt()

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.

DES_ecb_encrypt()

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.

DES_ede3_cbc_encrypt()

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.

DES_encrypt()

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.

DES_init_random_number_generator()

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.

DES_is_weak_key()

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.

DES_key_sched()

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.

DES_new_random_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.

DES_pcbc_encrypt()

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.

DES_random_key()

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.

DES_set_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

DES_set_key_checked()

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.

DES_set_key_unchecked()

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

DES_set_odd_parity()

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.

DES_string_to_key()

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