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/********************************************************************************/
/* */
/* Functions Required for TDES */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: CryptDes.c 1398 2018-12-17 22:37:57Z kgoldman $ */
/* */
/* Licenses and Notices */
/* */
/* 1. Copyright Licenses: */
/* */
/* - Trusted Computing Group (TCG) grants to the user of the source code in */
/* this specification (the "Source Code") a worldwide, irrevocable, */
/* nonexclusive, royalty free, copyright license to reproduce, create */
/* derivative works, distribute, display and perform the Source Code and */
/* derivative works thereof, and to grant others the rights granted herein. */
/* */
/* - The TCG grants to the user of the other parts of the specification */
/* (other than the Source Code) the rights to reproduce, distribute, */
/* display, and perform the specification solely for the purpose of */
/* developing products based on such documents. */
/* */
/* 2. Source Code Distribution Conditions: */
/* */
/* - Redistributions of Source Code must retain the above copyright licenses, */
/* this list of conditions and the following disclaimers. */
/* */
/* - Redistributions in binary form must reproduce the above copyright */
/* licenses, this list of conditions and the following disclaimers in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* 3. Disclaimers: */
/* */
/* - THE COPYRIGHT LICENSES SET FORTH ABOVE DO NOT REPRESENT ANY FORM OF */
/* LICENSE OR WAIVER, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, WITH */
/* RESPECT TO PATENT RIGHTS HELD BY TCG MEMBERS (OR OTHER THIRD PARTIES) */
/* THAT MAY BE NECESSARY TO IMPLEMENT THIS SPECIFICATION OR OTHERWISE. */
/* Contact TCG Administration (admin@trustedcomputinggroup.org) for */
/* information on specification licensing rights available through TCG */
/* membership agreements. */
/* */
/* - THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO EXPRESS OR IMPLIED */
/* WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR */
/* FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, COMPLETENESS, OR */
/* NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, OR ANY WARRANTY */
/* OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. */
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/* liability, including liability for infringement of any proprietary */
/* rights, relating to use of information in this specification and to the */
/* implementation of this specification, and TCG disclaims all liability for */
/* cost of procurement of substitute goods or services, lost profits, loss */
/* of use, loss of data or any incidental, consequential, direct, indirect, */
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/* arising in any way out of use or reliance upon this specification or any */
/* information herein. */
/* */
/* (c) Copyright IBM Corp. and others, 2016 - 2018 */
/* */
/********************************************************************************/
/* 10.2.9 CryptDes.c */
/* 10.2.9.1 Introduction */
/* This file contains the extra functions required for TDES. */
/* 10.2.9.2 Includes, Defines, and Typedefs */
#include "Tpm.h"
#include "Helpers_fp.h" // libtpms added
#if ALG_TDES
#define DES_NUM_WEAK 64
const UINT64 DesWeakKeys[DES_NUM_WEAK] = {
0x0101010101010101ULL, 0xFEFEFEFEFEFEFEFEULL, 0xE0E0E0E0F1F1F1F1ULL, 0x1F1F1F1F0E0E0E0EULL,
0x011F011F010E010EULL, 0x1F011F010E010E01ULL, 0x01E001E001F101F1ULL, 0xE001E001F101F101ULL,
0x01FE01FE01FE01FEULL, 0xFE01FE01FE01FE01ULL, 0x1FE01FE00EF10EF1ULL, 0xE01FE01FF10EF10EULL,
0x1FFE1FFE0EFE0EFEULL, 0xFE1FFE1FFE0EFE0EULL, 0xE0FEE0FEF1FEF1FEULL, 0xFEE0FEE0FEF1FEF1ULL,
0x01011F1F01010E0EULL, 0x1F1F01010E0E0101ULL, 0xE0E01F1FF1F10E0EULL, 0x0101E0E00101F1F1ULL,
0x1F1FE0E00E0EF1F1ULL, 0xE0E0FEFEF1F1FEFEULL, 0x0101FEFE0101FEFEULL, 0x1F1FFEFE0E0EFEFEULL,
0xE0FE011FF1FE010EULL, 0x011F1F01010E0E01ULL, 0x1FE001FE0EF101FEULL, 0xE0FE1F01F1FE0E01ULL,
0x011FE0FE010EF1FEULL, 0x1FE0E01F0EF1F10EULL, 0xE0FEFEE0F1FEFEF1ULL, 0x011FFEE0010EFEF1ULL,
0x1FE0FE010EF1FE01ULL, 0xFE0101FEFE0101FEULL, 0x01E01FFE01F10EFEULL, 0x1FFE01E00EFE01F1ULL,
0xFE011FE0FE010EF1ULL, 0xFE01E01FFE01F10EULL, 0x1FFEE0010EFEF101ULL, 0xFE1F01E0FE0E01F1ULL,
0x01E0E00101F1F101ULL, 0x1FFEFE1F0EFEFE0EULL, 0xFE1FE001FE0EF101ULL, 0x01E0FE1F01F1FE0EULL,
0xE00101E0F10101F1ULL, 0xFE1F1FFEFE0E0EFEULL, 0x01FE1FE001FE0EF1ULL, 0xE0011FFEF1010EFEULL,
0xFEE0011FFEF1010EULL, 0x01FEE01F01FEF10EULL, 0xE001FE1FF101FE0EULL, 0xFEE01F01FEF10E01ULL,
0x01FEFE0101FEFE01ULL, 0xE01F01FEF10E01FEULL, 0xFEE0E0FEFEF1F1FEULL, 0x1F01011F0E01010EULL,
0xE01F1FE0F10E0EF1ULL, 0xFEFE0101FEFE0101ULL, 0x1F01E0FE0E01F1FEULL, 0xE01FFE01F10EFE01ULL,
0xFEFE1F1FFEFE0E0EULL, 0x1F01FEE00E01FEF1ULL, 0xE0E00101F1F10101ULL, 0xFEFEE0E0FEFEF1F1ULL};
/* 10.2.9.2.1 CryptSetOddByteParity() */
/* This function sets the per byte parity of a 64-bit value. The least-significant bit is of each
byte is replaced with the odd parity of the other 7 bits in the byte. With odd parity, no byte
will ever be 0x00. */
UINT64
CryptSetOddByteParity(
UINT64 k
)
{
#define PMASK 0x0101010101010101ULL
UINT64 out;
k |= PMASK; // set the parity bit
out = k;
k ^= k >> 4;
k ^= k >> 2;
k ^= k >> 1;
k &= PMASK; // odd parity extracted
out ^= k; // out is now even parity because parity bit was already set
out ^= PMASK; // out is now even parity
return out;
}
/* 10.2.9.2.2 CryptDesIsWeakKey() */
/* Check to see if a DES key is on the list of weak, semi-weak, or possibly weak keys. */
/* Return Value Meaning */
/* TRUE(1) DES key is weak */
/* FALSE(0) DES key is not weak */
static BOOL
CryptDesIsWeakKey(
UINT64 k
)
{
int i;
//
for(i = 0; i < DES_NUM_WEAK; i++)
{
if(k == DesWeakKeys[i])
return TRUE;
}
return FALSE;
}
/* 10.2.9.2.3 CryptDesValidateKey() */
/* Function to check to see if the input key is a valid DES key where the definition of valid is
that none of the elements are on the list of weak, semi-weak, or possibly weak keys; and that for
two keys, K1!=K2, and for three keys that K1!=K2 and K2!=K3. */
BOOL
CryptDesValidateKey(
TPM2B_SYM_KEY *desKey // IN: key to validate
)
{
UINT64 k[3];
int i;
int keys = (desKey->t.size + 7) / 8;
BYTE *pk = desKey->t.buffer;
BOOL ok;
//
// Note: 'keys' is the number of keys, not the maximum index for 'k'
ok = ((keys == 2) || (keys == 3)) && ((desKey->t.size % 8) == 0);
for(i = 0; ok && i < keys; pk += 8, i++)
{
k[i] = CryptSetOddByteParity(BYTE_ARRAY_TO_UINT64(pk));
ok = !CryptDesIsWeakKey(k[i]);
}
ok = ok && k[0] != k[1];
if(keys == 3)
ok = ok && k[1] != k[2];
return ok;
}
/* 10.2.9.2.4 CryptGenerateKeyDes() */
/* This function is used to create a DES key of the appropriate size. The key will have odd parity
in the bytes. */
TPM_RC
CryptGenerateKeyDes(
TPMT_PUBLIC *publicArea, // IN/OUT: The public area template
// for the new key.
TPMT_SENSITIVE *sensitive, // OUT: sensitive area
RAND_STATE *rand // IN: the "entropy" source for
)
{
// Assume that the publicArea key size has been validated and is a supported
// number of bits.
sensitive->sensitive.sym.t.size =
BITS_TO_BYTES(publicArea->parameters.symDetail.sym.keyBits.sym);
#if USE_OPENSSL_FUNCTIONS_SYMMETRIC // libtpms added begin
if (rand == NULL)
return OpenSSLCryptGenerateKeyDes(sensitive);
#endif // libtpms added end
do
{
BYTE *pK = sensitive->sensitive.sym.t.buffer;
int i = (sensitive->sensitive.sym.t.size + 7) / 8;
// Use the random number generator to generate the required number of bits
if(DRBG_Generate(rand, pK, sensitive->sensitive.sym.t.size) == 0)
return TPM_RC_NO_RESULT;
for(; i > 0; pK += 8, i--)
{
UINT64 k = BYTE_ARRAY_TO_UINT64(pK);
k = CryptSetOddByteParity(k);
UINT64_TO_BYTE_ARRAY(k, pK);
}
} while(!CryptDesValidateKey(&sensitive->sensitive.sym));
return TPM_RC_SUCCESS;
}
#endif
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