des.h File Reference

DES block cipher. More...

#include "config.h"
#include <stddef.h>
#include <stdint.h>
Include dependency graph for des.h:

Go to the source code of this file.

Data Structures

struct  mbedtls_des_context
 DES context structure. More...
struct  mbedtls_des3_context
 Triple-DES context structure. More...

Defines

#define MBEDTLS_DES_ENCRYPT   1
#define MBEDTLS_DES_DECRYPT   0
#define MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH   -0x0032
#define MBEDTLS_ERR_DES_HW_ACCEL_FAILED   -0x0033
#define MBEDTLS_DES_KEY_SIZE   8

Functions

void mbedtls_des_init (mbedtls_des_context *ctx)
 Initialize DES context.
void mbedtls_des_free (mbedtls_des_context *ctx)
 Clear DES context.
void mbedtls_des3_init (mbedtls_des3_context *ctx)
 Initialize Triple-DES context.
void mbedtls_des3_free (mbedtls_des3_context *ctx)
 Clear Triple-DES context.
void mbedtls_des_key_set_parity (unsigned char key[MBEDTLS_DES_KEY_SIZE])
 Set key parity on the given key to odd.
int mbedtls_des_key_check_key_parity (const unsigned char key[MBEDTLS_DES_KEY_SIZE])
 Check that key parity on the given key is odd.
int mbedtls_des_key_check_weak (const unsigned char key[MBEDTLS_DES_KEY_SIZE])
 Check that key is not a weak or semi-weak DES key.
int mbedtls_des_setkey_enc (mbedtls_des_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE])
 DES key schedule (56-bit, encryption).
int mbedtls_des_setkey_dec (mbedtls_des_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE])
 DES key schedule (56-bit, decryption).
int mbedtls_des3_set2key_enc (mbedtls_des3_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE *2])
 Triple-DES key schedule (112-bit, encryption).
int mbedtls_des3_set2key_dec (mbedtls_des3_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE *2])
 Triple-DES key schedule (112-bit, decryption).
int mbedtls_des3_set3key_enc (mbedtls_des3_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE *3])
 Triple-DES key schedule (168-bit, encryption).
int mbedtls_des3_set3key_dec (mbedtls_des3_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE *3])
 Triple-DES key schedule (168-bit, decryption).
int mbedtls_des_crypt_ecb (mbedtls_des_context *ctx, const unsigned char input[8], unsigned char output[8])
 DES-ECB block encryption/decryption.
int mbedtls_des_crypt_cbc (mbedtls_des_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output)
 DES-CBC buffer encryption/decryption.
int mbedtls_des3_crypt_ecb (mbedtls_des3_context *ctx, const unsigned char input[8], unsigned char output[8])
 3DES-ECB block encryption/decryption
int mbedtls_des3_crypt_cbc (mbedtls_des3_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output)
 3DES-CBC buffer encryption/decryption
void mbedtls_des_setkey (uint32_t SK[32], const unsigned char key[MBEDTLS_DES_KEY_SIZE])
 Internal function for key expansion. (Only exposed to allow overriding it, see MBEDTLS_DES_SETKEY_ALT).
int mbedtls_des_self_test (int verbose)
 Checkup routine.

Detailed Description

DES block cipher.

Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.

Definition in file des.h.


Define Documentation

#define MBEDTLS_DES_DECRYPT   0

Definition at line 69 of file des.h.

#define MBEDTLS_DES_ENCRYPT   1

Definition at line 68 of file des.h.

#define MBEDTLS_DES_KEY_SIZE   8

Definition at line 74 of file des.h.

#define MBEDTLS_ERR_DES_HW_ACCEL_FAILED   -0x0033

DES hardware accelerator failed.

Definition at line 72 of file des.h.

#define MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH   -0x0032

The data input has an invalid length.

Definition at line 71 of file des.h.


Function Documentation

int mbedtls_des3_crypt_cbc ( mbedtls_des3_context ctx,
int  mode,
size_t  length,
unsigned char  iv[8],
const unsigned char *  input,
unsigned char *  output 
)

3DES-CBC buffer encryption/decryption

Note:
Upon exit, the content of the IV is updated so that you can call the function same function again on the following block(s) of data and get the same result as if it was encrypted in one call. This allows a "streaming" usage. If on the other hand you need to retain the contents of the IV, you should either save it manually or use the cipher module instead.
Parameters:
ctx 3DES context
mode MBEDTLS_DES_ENCRYPT or MBEDTLS_DES_DECRYPT
length length of the input data
iv initialization vector (updated after use)
input buffer holding the input data
output buffer holding the output data
Returns:
0 if successful, or MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH
int mbedtls_des3_crypt_ecb ( mbedtls_des3_context ctx,
const unsigned char  input[8],
unsigned char  output[8] 
)

3DES-ECB block encryption/decryption

Parameters:
ctx 3DES context
input 64-bit input block
output 64-bit output block
Returns:
0 if successful
void mbedtls_des3_free ( mbedtls_des3_context ctx  ) 

Clear Triple-DES context.

Parameters:
ctx DES3 context to be cleared
void mbedtls_des3_init ( mbedtls_des3_context ctx  ) 

Initialize Triple-DES context.

Parameters:
ctx DES3 context to be initialized
int mbedtls_des3_set2key_dec ( mbedtls_des3_context ctx,
const unsigned char  key[MBEDTLS_DES_KEY_SIZE *2] 
)

Triple-DES key schedule (112-bit, decryption).

Parameters:
ctx 3DES context to be initialized
key 16-byte secret key
Returns:
0
int mbedtls_des3_set2key_enc ( mbedtls_des3_context ctx,
const unsigned char  key[MBEDTLS_DES_KEY_SIZE *2] 
)

Triple-DES key schedule (112-bit, encryption).

Parameters:
ctx 3DES context to be initialized
key 16-byte secret key
Returns:
0
int mbedtls_des3_set3key_dec ( mbedtls_des3_context ctx,
const unsigned char  key[MBEDTLS_DES_KEY_SIZE *3] 
)

Triple-DES key schedule (168-bit, decryption).

Parameters:
ctx 3DES context to be initialized
key 24-byte secret key
Returns:
0
int mbedtls_des3_set3key_enc ( mbedtls_des3_context ctx,
const unsigned char  key[MBEDTLS_DES_KEY_SIZE *3] 
)

Triple-DES key schedule (168-bit, encryption).

Parameters:
ctx 3DES context to be initialized
key 24-byte secret key
Returns:
0
int mbedtls_des_crypt_cbc ( mbedtls_des_context ctx,
int  mode,
size_t  length,
unsigned char  iv[8],
const unsigned char *  input,
unsigned char *  output 
)

DES-CBC buffer encryption/decryption.

Note:
Upon exit, the content of the IV is updated so that you can call the function same function again on the following block(s) of data and get the same result as if it was encrypted in one call. This allows a "streaming" usage. If on the other hand you need to retain the contents of the IV, you should either save it manually or use the cipher module instead.
Parameters:
ctx DES context
mode MBEDTLS_DES_ENCRYPT or MBEDTLS_DES_DECRYPT
length length of the input data
iv initialization vector (updated after use)
input buffer holding the input data
output buffer holding the output data
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
int mbedtls_des_crypt_ecb ( mbedtls_des_context ctx,
const unsigned char  input[8],
unsigned char  output[8] 
)

DES-ECB block encryption/decryption.

Parameters:
ctx DES context
input 64-bit input block
output 64-bit output block
Returns:
0 if successful
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
void mbedtls_des_free ( mbedtls_des_context ctx  ) 

Clear DES context.

Parameters:
ctx DES context to be cleared
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
void mbedtls_des_init ( mbedtls_des_context ctx  ) 

Initialize DES context.

Parameters:
ctx DES context to be initialized
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
int mbedtls_des_key_check_key_parity ( const unsigned char  key[MBEDTLS_DES_KEY_SIZE]  ) 

Check that key parity on the given key is odd.

DES keys are 56 bits long, but each byte is padded with a parity bit to allow verification.

Parameters:
key 8-byte secret key
Returns:
0 is parity was ok, 1 if parity was not correct.
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
int mbedtls_des_key_check_weak ( const unsigned char  key[MBEDTLS_DES_KEY_SIZE]  ) 

Check that key is not a weak or semi-weak DES key.

Parameters:
key 8-byte secret key
Returns:
0 if no weak key was found, 1 if a weak key was identified.
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
void mbedtls_des_key_set_parity ( unsigned char  key[MBEDTLS_DES_KEY_SIZE]  ) 

Set key parity on the given key to odd.

DES keys are 56 bits long, but each byte is padded with a parity bit to allow verification.

Parameters:
key 8-byte secret key
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
int mbedtls_des_self_test ( int  verbose  ) 

Checkup routine.

Returns:
0 if successful, or 1 if the test failed
void mbedtls_des_setkey ( uint32_t  SK[32],
const unsigned char  key[MBEDTLS_DES_KEY_SIZE] 
)

Internal function for key expansion. (Only exposed to allow overriding it, see MBEDTLS_DES_SETKEY_ALT).

Parameters:
SK Round keys
key Base key
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
int mbedtls_des_setkey_dec ( mbedtls_des_context ctx,
const unsigned char  key[MBEDTLS_DES_KEY_SIZE] 
)

DES key schedule (56-bit, decryption).

Parameters:
ctx DES context to be initialized
key 8-byte secret key
Returns:
0
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.
int mbedtls_des_setkey_enc ( mbedtls_des_context ctx,
const unsigned char  key[MBEDTLS_DES_KEY_SIZE] 
)

DES key schedule (56-bit, encryption).

Parameters:
ctx DES context to be initialized
key 8-byte secret key
Returns:
0
Warning:
DES is considered a weak cipher and its use constitutes a security risk. We recommend considering stronger ciphers instead.

Generated on 10 Aug 2020 for mbed TLS v2.7.16 by  doxygen 1.6.1