desx.c File Reference

#include "precomp.h"

Include dependency graph for desx.c:

Go to the source code of this file.

Functions
SYMCRYPT_ERROR SYMCRYPT_CALL	SymCryptDesxExpandKey (_Out_ PSYMCRYPT_DESX_EXPANDED_KEY pExpandedKey, _In_reads_(cbKey) PCBYTE pbKey, SIZE_T cbKey)
VOID SYMCRYPT_CALL	SymCryptDesxEncrypt (_In_ PCSYMCRYPT_DESX_EXPANDED_KEY pExpandedKey, _In_reads_(SYMCRYPT_DESX_BLOCK_SIZE) PCBYTE pbSrc, _Out_writes_(SYMCRYPT_DESX_BLOCK_SIZE) PBYTE pbDst)
VOID SYMCRYPT_CALL	SymCryptDesxDecrypt (_In_ PCSYMCRYPT_DESX_EXPANDED_KEY pExpandedKey, _In_reads_(SYMCRYPT_DESX_BLOCK_SIZE) PCBYTE pbSrc, _Out_writes_(SYMCRYPT_DESX_BLOCK_SIZE) PBYTE pbDst)
VOID SYMCRYPT_CALL	SymCryptDesxSelftest (void)

Variables
const SYMCRYPT_BLOCKCIPHER	SymCryptDesxBlockCipher_default
const PCSYMCRYPT_BLOCKCIPHER	SymCryptDesxBlockCipher = &SymCryptDesxBlockCipher_default
static const BYTE	desxKnownKey [24]
static const BYTE	desxKnownPlaintext []
static const BYTE	desxKnownCiphertext []

Function Documentation

SymCryptDesxDecrypt()

VOID SYMCRYPT_CALL SymCryptDesxDecrypt	(	_In_ PCSYMCRYPT_DESX_EXPANDED_KEY	pExpandedKey,
		_In_reads_(SYMCRYPT_DESX_BLOCK_SIZE) PCBYTE	pbSrc,
		_Out_writes_(SYMCRYPT_DESX_BLOCK_SIZE) PBYTE	pbDst
	)

Definition at line 68 of file desx.c.

{
    SYMCRYPT_ALIGN BYTE buf[8];
 
    //
    // We buffer the result locally to obey the read once/write once rule.
    //
    SymCryptXorBytes( pbSrc, pExpandedKey->outputWhitening, buf, 8 );
    SymCryptDesDecrypt( &pExpandedKey->desKey, buf, buf );
    SymCryptXorBytes( buf, pExpandedKey->inputWhitening, pbDst, 8 );
 
    SymCryptWipeKnownSize( buf, sizeof( buf ) );
}

Referenced by SymCryptDesxSelftest().

SymCryptDesxEncrypt()

VOID SYMCRYPT_CALL SymCryptDesxEncrypt	(	_In_ PCSYMCRYPT_DESX_EXPANDED_KEY	pExpandedKey,
		_In_reads_(SYMCRYPT_DESX_BLOCK_SIZE) PCBYTE	pbSrc,
		_Out_writes_(SYMCRYPT_DESX_BLOCK_SIZE) PBYTE	pbDst
	)

Definition at line 49 of file desx.c.

{
    SYMCRYPT_ALIGN BYTE buf[8];
 
    //
    // We buffer the result locally to obey the read once/write once rule.
    //
    SymCryptXorBytes( pbSrc, pExpandedKey->inputWhitening, buf, 8 );
    SymCryptDesEncrypt( &pExpandedKey->desKey, buf, buf );
    SymCryptXorBytes( buf, pExpandedKey->outputWhitening, pbDst, 8 );
 
    SymCryptWipeKnownSize( buf, sizeof( buf ) );
}

Referenced by SymCryptDesxSelftest().

SymCryptDesxExpandKey()

SYMCRYPT_ERROR SYMCRYPT_CALL SymCryptDesxExpandKey	(	_Out_ PSYMCRYPT_DESX_EXPANDED_KEY	pExpandedKey,
		_In_reads_(cbKey) PCBYTE	pbKey,
		SIZE_T	cbKey
	)

Definition at line 31 of file desx.c.

{
    if( cbKey != 24 )
    {
        return SYMCRYPT_WRONG_KEY_SIZE;
    }
 
    SymCryptDesExpandKey( &pExpandedKey->desKey, pbKey, 8 );
    memcpy( pExpandedKey->inputWhitening, pbKey+8, 8 );
    memcpy( pExpandedKey->outputWhitening, pbKey+16, 8 );
 
    return SYMCRYPT_NO_ERROR;
}

Referenced by SymCryptDesxSelftest().

SymCryptDesxSelftest()

VOID SYMCRYPT_CALL SymCryptDesxSelftest

(

void

)

Definition at line 103 of file desx.c.

{
    SYMCRYPT_DESX_EXPANDED_KEY key;
    BYTE buf[SYMCRYPT_DESX_BLOCK_SIZE];
 
    if( SymCryptDesxExpandKey( &key, desxKnownKey, sizeof( desxKnownKey )) != SYMCRYPT_NO_ERROR )
    {
        SymCryptFatal( 'desx' );
    }
 
    SymCryptDesxEncrypt( &key, desxKnownPlaintext, buf );
 
    SymCryptInjectError( buf, SYMCRYPT_DESX_BLOCK_SIZE );
 
    if( memcmp( buf, desxKnownCiphertext, SYMCRYPT_DESX_BLOCK_SIZE ) != 0 )
    {
        SymCryptFatal( 'desy' );
    }
 
    SymCryptDesxDecrypt( &key, desxKnownCiphertext, buf );
 
    SymCryptInjectError( buf, SYMCRYPT_DESX_BLOCK_SIZE );
 
    if( memcmp( buf, desxKnownPlaintext, SYMCRYPT_DESX_BLOCK_SIZE ) != 0 )
    {
        SymCryptFatal( 'desz' );
    }
 
}

Variable Documentation

desxKnownCiphertext

const BYTE desxKnownCiphertext[]

static

Initial value:

= {
    0x66, 0x77, 0x1f, 0x2a, 0x0c, 0x05, 0x01, 0xca
}

Definition at line 96 of file desx.c.

Referenced by SymCryptDesxSelftest().

desxKnownKey

const BYTE desxKnownKey[24]

static

Initial value:

= {
    0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
    0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff,
    0x01, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18
}

Definition at line 86 of file desx.c.

Referenced by SymCryptDesxSelftest().

desxKnownPlaintext

const BYTE desxKnownPlaintext[]

static

Initial value:

= {
    0xd9, 0xb6, 0xa1, 0x4e, 0xe6, 0x71, 0x4e, 0x17
}

Definition at line 92 of file desx.c.

Referenced by SymCryptDesxSelftest().

SymCryptDesxBlockCipher

const PCSYMCRYPT_BLOCKCIPHER SymCryptDesxBlockCipher = &SymCryptDesxBlockCipher_default

Definition at line 27 of file desx.c.

SymCryptDesxBlockCipher_default

const SYMCRYPT_BLOCKCIPHER SymCryptDesxBlockCipher_default

Initial value:

= {
    SymCryptDesxExpandKey,  
    SymCryptDesxEncrypt,    
    SymCryptDesxDecrypt,    
    NULL,                   
    NULL,                   
    NULL,                   
    NULL,                   
    NULL,                   
    NULL,                   
    NULL,                   
    NULL,                   
    8,                      
    sizeof( SYMCRYPT_DESX_EXPANDED_KEY ), 
}

Definition at line 11 of file desx.c.