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/********************************************************************************/
/* */
/* Encrypt Decrypt Support */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: EncryptDecrypt_spt.c 1658 2021-01-22 23:14:01Z 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. */
/* */
/* - Without limitation, TCG and its members and licensors disclaim all */
/* 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 - 2021 */
/* */
/********************************************************************************/
/* 7.7 Encrypt Decrypt Support (EncryptDecrypt_spt.c) */
#include "Tpm.h"
#include "EncryptDecrypt_fp.h"
#include "EncryptDecrypt_spt_fp.h"
#if CC_EncryptDecrypt2
/* Error Returns Meaning */
/* TPM_RC_KEY is not a symmetric decryption key with both public and private portions loaded */
/* TPM_RC_SIZE IvIn size is incompatible with the block cipher mode; or inData size is not an even
multiple of the block size for CBC or ECB mode */
/* TPM_RC_VALUE keyHandle is restricted and the argument mode does not match the key's mode */
TPM_RC
EncryptDecryptShared(
TPMI_DH_OBJECT keyHandleIn,
TPMI_YES_NO decryptIn,
TPMI_ALG_SYM_MODE modeIn,
TPM2B_IV *ivIn,
TPM2B_MAX_BUFFER *inData,
EncryptDecrypt_Out *out
)
{
OBJECT *symKey;
UINT16 keySize;
UINT16 blockSize;
BYTE *key;
TPM_ALG_ID alg;
TPM_ALG_ID mode;
TPM_RC result;
BOOL OK;
// Input Validation
symKey = HandleToObject(keyHandleIn);
mode = symKey->publicArea.parameters.symDetail.sym.mode.sym;
// The input key should be a symmetric key
if(symKey->publicArea.type != TPM_ALG_SYMCIPHER)
return TPM_RCS_KEY + RC_EncryptDecrypt_keyHandle;
// The key must be unrestricted and allow the selected operation
OK = !IS_ATTRIBUTE(symKey->publicArea.objectAttributes,
TPMA_OBJECT, restricted);
if(YES == decryptIn)
OK = OK && IS_ATTRIBUTE(symKey->publicArea.objectAttributes,
TPMA_OBJECT, decrypt);
else
OK = OK && IS_ATTRIBUTE(symKey->publicArea.objectAttributes,
TPMA_OBJECT, sign);
if(!OK)
return TPM_RCS_ATTRIBUTES + RC_EncryptDecrypt_keyHandle;
// Make sure that key is an encrypt/decrypt key and not SMAC
if(!CryptSymModeIsValid(mode, TRUE))
return TPM_RCS_MODE + RC_EncryptDecrypt_keyHandle;
// If the key mode is not TPM_ALG_NULL...
// or TPM_ALG_NULL
if(mode != TPM_ALG_NULL)
{
// then the input mode has to be TPM_ALG_NULL or the same as the key
if((modeIn != TPM_ALG_NULL) && (modeIn != mode))
return TPM_RCS_MODE + RC_EncryptDecrypt_mode;
}
else
{
// if the key mode is null, then the input can't be null
if(modeIn == TPM_ALG_NULL)
return TPM_RCS_MODE + RC_EncryptDecrypt_mode;
mode = modeIn;
}
// The input iv for ECB mode should be an Empty Buffer. All the other modes
// should have an iv size same as encryption block size
keySize = symKey->publicArea.parameters.symDetail.sym.keyBits.sym;
alg = symKey->publicArea.parameters.symDetail.sym.algorithm;
blockSize = CryptGetSymmetricBlockSize(alg, keySize);
// reverify the algorithm. This is mainly to keep static analysis tools happy
if(blockSize == 0)
return TPM_RCS_KEY + RC_EncryptDecrypt_keyHandle;
if(((mode == TPM_ALG_ECB) && (ivIn->t.size != 0))
|| ((mode != TPM_ALG_ECB) && (ivIn->t.size != blockSize)))
return TPM_RCS_SIZE + RC_EncryptDecrypt_ivIn;
// The input data size of CBC mode or ECB mode must be an even multiple of
// the symmetric algorithm's block size
if(((mode == TPM_ALG_CBC) || (mode == TPM_ALG_ECB))
&& ((inData->t.size % blockSize) != 0))
return TPM_RCS_SIZE + RC_EncryptDecrypt_inData;
// Copy IV
// Note: This is copied here so that the calls to the encrypt/decrypt functions
// will modify the output buffer, not the input buffer
out->ivOut = *ivIn;
// Command Output
key = symKey->sensitive.sensitive.sym.t.buffer;
// For symmetric encryption, the cipher data size is the same as plain data
// size.
out->outData.t.size = inData->t.size;
if(decryptIn == YES)
{
// Decrypt data to output
result = CryptSymmetricDecrypt(out->outData.t.buffer, alg, keySize, key,
&(out->ivOut), mode, inData->t.size,
inData->t.buffer);
}
else
{
// Encrypt data to output
result = CryptSymmetricEncrypt(out->outData.t.buffer, alg, keySize, key,
&(out->ivOut), mode, inData->t.size,
inData->t.buffer);
}
return result;
}
#endif // CC_EncryptDecrypt
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