des.h File Reference

DES block cipher. More...

#include "config.h"
#include <string.h>
#include <inttypes.h>
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Data Structures

struct  des_context
 DES context structure. More...
struct  des3_context
 Triple-DES context structure. More...

Defines

#define DES_ENCRYPT   1
#define DES_DECRYPT   0
#define POLARSSL_ERR_DES_INVALID_INPUT_LENGTH   -0x0032
 The data input has an invalid length.
#define DES_KEY_SIZE   8

Functions

void des_key_set_parity (unsigned char key[DES_KEY_SIZE])
 Set key parity on the given key to odd.
int des_key_check_key_parity (const unsigned char key[DES_KEY_SIZE])
 Check that key parity on the given key is odd.
int des_key_check_weak (const unsigned char key[DES_KEY_SIZE])
 Check that key is not a weak or semi-weak DES key.
int des_setkey_enc (des_context *ctx, const unsigned char key[DES_KEY_SIZE])
 DES key schedule (56-bit, encryption).
int des_setkey_dec (des_context *ctx, const unsigned char key[DES_KEY_SIZE])
 DES key schedule (56-bit, decryption).
int des3_set2key_enc (des3_context *ctx, const unsigned char key[DES_KEY_SIZE *2])
 Triple-DES key schedule (112-bit, encryption).
int des3_set2key_dec (des3_context *ctx, const unsigned char key[DES_KEY_SIZE *2])
 Triple-DES key schedule (112-bit, decryption).
int des3_set3key_enc (des3_context *ctx, const unsigned char key[DES_KEY_SIZE *3])
 Triple-DES key schedule (168-bit, encryption).
int des3_set3key_dec (des3_context *ctx, const unsigned char key[DES_KEY_SIZE *3])
 Triple-DES key schedule (168-bit, decryption).
int des_crypt_ecb (des_context *ctx, const unsigned char input[8], unsigned char output[8])
 DES-ECB block encryption/decryption.
int des_crypt_cbc (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 des3_crypt_ecb (des3_context *ctx, const unsigned char input[8], unsigned char output[8])
 3DES-ECB block encryption/decryption
int des3_crypt_cbc (des3_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output)
 3DES-CBC buffer encryption/decryption
int des_self_test (int verbose)
 Checkup routine.

Detailed Description

DES block cipher.

Copyright (C) 2006-2013, Brainspark B.V.

This file is part of PolarSSL (http://www.polarssl.org) Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>

All rights reserved.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

Definition in file des.h.


Define Documentation

#define DES_DECRYPT   0
#define DES_ENCRYPT   1
#define DES_KEY_SIZE   8

Definition at line 46 of file des.h.

Referenced by test_suite_des_key_parity_run().

#define POLARSSL_ERR_DES_INVALID_INPUT_LENGTH   -0x0032

The data input has an invalid length.

Definition at line 44 of file des.h.

Referenced by des3_crypt_cbc(), des_crypt_cbc(), polarssl_strerror(), and verify_int().


Function Documentation

int des3_crypt_cbc ( des3_context ctx,
int  mode,
size_t  length,
unsigned char  iv[8],
const unsigned char *  input,
unsigned char *  output 
)

3DES-CBC buffer encryption/decryption

Parameters:
ctx 3DES context
mode DES_ENCRYPT or 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 POLARSSL_ERR_DES_INVALID_INPUT_LENGTH

Definition at line 710 of file des.c.

References des3_crypt_ecb(), DES_ENCRYPT, and POLARSSL_ERR_DES_INVALID_INPUT_LENGTH.

Referenced by des3_crypt_cbc_wrap(), des_self_test(), pem_des3_decrypt(), test_suite_des3_decrypt_cbc(), and test_suite_des3_encrypt_cbc().

int des3_crypt_ecb ( 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

Definition at line 666 of file des.c.

References DES_FP, DES_IP, DES_ROUND, GET_UINT32_BE, PUT_UINT32_BE, and des3_context::sk.

Referenced by des3_crypt_cbc(), des3_crypt_ecb_wrap(), des_self_test(), test_suite_des3_decrypt_ecb(), and test_suite_des3_encrypt_ecb().

int des3_set2key_dec ( des3_context ctx,
const unsigned char  key[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

Definition at line 519 of file des.c.

References des3_set2key(), key, and des3_context::sk.

Referenced by des3_set2key_dec_wrap(), des_self_test(), test_suite_des3_decrypt_cbc(), and test_suite_des3_decrypt_ecb().

int des3_set2key_enc ( des3_context ctx,
const unsigned char  key[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

Definition at line 506 of file des.c.

References des3_set2key(), key, and des3_context::sk.

Referenced by des3_set2key_enc_wrap(), des_self_test(), test_suite_des3_encrypt_cbc(), and test_suite_des3_encrypt_ecb().

int des3_set3key_dec ( des3_context ctx,
const unsigned char  key[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

Definition at line 568 of file des.c.

References des3_set3key(), key, and des3_context::sk.

Referenced by des3_set3key_dec_wrap(), des_self_test(), pem_des3_decrypt(), test_suite_des3_decrypt_cbc(), and test_suite_des3_decrypt_ecb().

int des3_set3key_enc ( des3_context ctx,
const unsigned char  key[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

Definition at line 555 of file des.c.

References des3_set3key(), key, and des3_context::sk.

Referenced by des3_set3key_enc_wrap(), des_self_test(), test_suite_des3_encrypt_cbc(), and test_suite_des3_encrypt_ecb().

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

DES-CBC buffer encryption/decryption.

Parameters:
ctx DES context
mode DES_ENCRYPT or 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

Definition at line 613 of file des.c.

References des_crypt_ecb(), DES_ENCRYPT, and POLARSSL_ERR_DES_INVALID_INPUT_LENGTH.

Referenced by des_crypt_cbc_wrap(), des_self_test(), pem_des_decrypt(), test_suite_des_decrypt_cbc(), and test_suite_des_encrypt_cbc().

int des_crypt_ecb ( 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

Definition at line 581 of file des.c.

References DES_FP, DES_IP, DES_ROUND, GET_UINT32_BE, PUT_UINT32_BE, and des_context::sk.

Referenced by des_crypt_cbc(), des_crypt_ecb_wrap(), des_self_test(), test_suite_des_decrypt_ecb(), and test_suite_des_encrypt_ecb().

int des_key_check_key_parity ( const unsigned char  key[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.

Definition at line 315 of file des.c.

References key, and odd_parity_table.

Referenced by test_suite_des_key_parity_run().

int des_key_check_weak ( const unsigned char  key[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.

Definition at line 370 of file des.c.

References key, WEAK_KEY_COUNT, and weak_key_table.

void des_key_set_parity ( unsigned char  key[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

Definition at line 304 of file des.c.

References key, and odd_parity_table.

Referenced by test_suite_des_key_parity_run().

int des_self_test ( int  verbose  ) 
int des_setkey_dec ( des_context ctx,
const unsigned char  key[DES_KEY_SIZE] 
)

DES key schedule (56-bit, decryption).

Parameters:
ctx DES context to be initialized
key 8-byte secret key
Returns:
0

Definition at line 463 of file des.c.

References des_setkey(), key, des_context::sk, and SWAP.

Referenced by des_self_test(), des_setkey_dec_wrap(), pem_des_decrypt(), test_suite_des_decrypt_cbc(), and test_suite_des_decrypt_ecb().

int des_setkey_enc ( des_context ctx,
const unsigned char  key[DES_KEY_SIZE] 
)

DES key schedule (56-bit, encryption).

Parameters:
ctx DES context to be initialized
key 8-byte secret key
Returns:
0

Definition at line 453 of file des.c.

References des_setkey(), key, and des_context::sk.

Referenced by des_self_test(), des_setkey_enc_wrap(), test_suite_des_encrypt_cbc(), and test_suite_des_encrypt_ecb().


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