| /* Microsoft Reference Implementation for TPM 2.0 | |
| * | |
| * The copyright in this software is being made available under the BSD License, | |
| * included below. This software may be subject to other third party and | |
| * contributor rights, including patent rights, and no such rights are granted | |
| * under this license. | |
| * | |
| * Copyright (c) Microsoft Corporation | |
| * | |
| * All rights reserved. | |
| * | |
| * BSD License | |
| * | |
| * Redistribution and use in source and binary forms, with or without modification, | |
| * are permitted provided that the following conditions are met: | |
| * | |
| * Redistributions of source code must retain the above copyright notice, this list | |
| * of conditions and the following disclaimer. | |
| * | |
| * Redistributions in binary form must reproduce the above copyright notice, this | |
| * list of conditions and the following disclaimer in the documentation and/or | |
| * other materials provided with the distribution. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS"" | |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR | |
| * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| */ | |
| #include "Tpm.h" | |
| #include "ECDH_ZGen_fp.h" | |
| #if CC_ECDH_ZGen // Conditional expansion of this file | |
| /*(See part 3 specification) | |
| // This command uses the TPM to recover the Z value from a public point | |
| */ | |
| // Return Type: TPM_RC | |
| // TPM_RC_ATTRIBUTES key referenced by 'keyA' is restricted or | |
| // not a decrypt key | |
| // TPM_RC_KEY key referenced by 'keyA' is not an ECC key | |
| // TPM_RC_NO_RESULT multiplying 'inPoint' resulted in a | |
| // point at infinity | |
| // TPM_RC_SCHEME the scheme of the key referenced by 'keyA' | |
| // is not TPM_ALG_NULL, TPM_ALG_ECDH, | |
| TPM_RC | |
| TPM2_ECDH_ZGen( | |
| ECDH_ZGen_In *in, // IN: input parameter list | |
| ECDH_ZGen_Out *out // OUT: output parameter list | |
| ) | |
| { | |
| TPM_RC result; | |
| OBJECT *eccKey; | |
| // Input Validation | |
| eccKey = HandleToObject(in->keyHandle); | |
| // Selected key must be a non-restricted, decrypt ECC key | |
| if(eccKey->publicArea.type != TPM_ALG_ECC) | |
| return TPM_RCS_KEY + RC_ECDH_ZGen_keyHandle; | |
| // Selected key needs to be unrestricted with the 'decrypt' attribute | |
| if(IS_ATTRIBUTE(eccKey->publicArea.objectAttributes, TPMA_OBJECT, restricted) | |
| || !IS_ATTRIBUTE(eccKey->publicArea.objectAttributes, TPMA_OBJECT, decrypt)) | |
| return TPM_RCS_ATTRIBUTES + RC_ECDH_ZGen_keyHandle; | |
| // Make sure the scheme allows this use | |
| if(eccKey->publicArea.parameters.eccDetail.scheme.scheme != TPM_ALG_ECDH | |
| && eccKey->publicArea.parameters.eccDetail.scheme.scheme != TPM_ALG_NULL) | |
| return TPM_RCS_SCHEME + RC_ECDH_ZGen_keyHandle; | |
| // Command Output | |
| // Compute Z. TPM_RC_ECC_POINT or TPM_RC_NO_RESULT may be returned here. | |
| result = CryptEccPointMultiply(&out->outPoint.point, | |
| eccKey->publicArea.parameters.eccDetail.curveID, | |
| &in->inPoint.point, | |
| &eccKey->sensitive.sensitive.ecc, | |
| NULL, NULL); | |
| if(result != TPM_RC_SUCCESS) | |
| return RcSafeAddToResult(result, RC_ECDH_ZGen_inPoint); | |
| return result; | |
| } | |
| #endif // CC_ECDH_ZGen |