115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// FILE : des3.c //
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// DESCRIPTION : Crypto CP interfaces: //
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// CPEncrypt //
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// CPDecrypt //
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// AUTHOR : //
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// HISTORY : //
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// Sep 13 1996 jeffspel Created //
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// //
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// Copyright (C) 1993 Microsoft Corporation All Rights Reserved //
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/////////////////////////////////////////////////////////////////////////////
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//#include <wtypes.h>
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#include "precomp.h"
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#include "nt_rsa.h"
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#include "des3.h"
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static BYTE l_ParityTable[] = {0x00,0x01,0x01,0x02,0x01,0x02,0x02,0x03,
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0x01,0x02,0x02,0x03,0x02,0x03,0x03,0x04};
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// In des2key.c:
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//
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// Fill in the DES3Table structs with the decrypt and encrypt
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// key expansions.
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//
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// Assumes that the second parameter points to 2 * DES_BLOCKLEN
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// bytes of key.
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//
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//
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void
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des2key(
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PDES3TABLE pDES3Table,
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PBYTE pbKey)
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{
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deskey(&pDES3Table->keytab1, pbKey);
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deskey(&pDES3Table->keytab2, pbKey+DES_KEYSIZE);
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CopyMemory(&pDES3Table->keytab3, &pDES3Table->keytab1, DES_TABLESIZE);
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}
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// In des3key.c:
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//
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// Fill in the DES3Table structs with the decrypt and encrypt
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// key expansions.
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//
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// Assumes that the second parameter points to 3 * DES_BLOCKLEN
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// bytes of key.
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//
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//
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void
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des3key(
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PDES3TABLE pDES3Table,
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PBYTE pbKey)
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{
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deskey(&pDES3Table->keytab1, pbKey);
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deskey(&pDES3Table->keytab2, pbKey+DES_KEYSIZE);
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deskey(&pDES3Table->keytab3, pbKey+2*DES_KEYSIZE);
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}
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//
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// Encrypt or decrypt with the key in DES3Table
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//
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void
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des3(
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PBYTE pbOut,
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PBYTE pbIn,
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void *pKey,
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int op)
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{
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PDES3TABLE pDES3Table = (PDES3TABLE)pKey;
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BYTE rgbEnc1[DES_BLOCKLEN];
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BYTE rgbEnc2[DES_BLOCKLEN];
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if (ENCRYPT == op) // encrypt case
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{
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des(rgbEnc1, pbIn, &pDES3Table->keytab1, ENCRYPT);
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des(rgbEnc2, rgbEnc1, &pDES3Table->keytab2, DECRYPT);
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memset(rgbEnc1, 0xFF, DES_BLOCKLEN);
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des(pbOut, rgbEnc2, &pDES3Table->keytab3, ENCRYPT);
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memset(rgbEnc2, 0xFF, DES_BLOCKLEN);
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}
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else // decrypt case
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{
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des(rgbEnc1, pbIn, &pDES3Table->keytab3, DECRYPT);
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des(rgbEnc2, rgbEnc1, &pDES3Table->keytab2, ENCRYPT);
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memset(rgbEnc1, 0xFF, DES_BLOCKLEN);
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des(pbOut, rgbEnc2, &pDES3Table->keytab1, DECRYPT);
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memset(rgbEnc2, 0xFF, DES_BLOCKLEN);
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}
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}
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//
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// set the parity on the DES key to be odd
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//
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void
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desparity(
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PBYTE pbKey,
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DWORD cbKey)
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{
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DWORD i;
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for (i=0;i<cbKey;i++)
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{
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if (!((l_ParityTable[pbKey[i]>>4] + l_ParityTable[pbKey[i]&0x0F]) % 2))
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pbKey[i] = (BYTE)(pbKey[i] ^ 0x01);
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}
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}
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