| Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 1 | // This file was extracted from the TCG Published |
| 2 | // Trusted Platform Module Library |
| 3 | // Part 3: Commands |
| 4 | // Family "2.0" |
| 5 | // Level 00 Revision 01.16 |
| 6 | // October 30, 2014 |
| 7 | |
| 8 | #include "InternalRoutines.h" |
| 9 | #include "ECDH_ZGen_fp.h" |
| 10 | #ifdef TPM_ALG_ECC |
| 11 | // |
| 12 | // |
| 13 | // Error Returns Meaning |
| 14 | // |
| 15 | // TPM_RC_ATTRIBUTES key referenced by keyA is restricted or not a decrypt key |
| 16 | // TPM_RC_KEY key referenced by keyA is not an ECC key |
| 17 | // TPM_RC_NO_RESULT multiplying inPoint resulted in a point at infinity |
| 18 | // TPM_RC_SCHEME the scheme of the key referenced by keyA is not TPM_ALG_NULL, |
| 19 | // TPM_ALG_ECDH, |
| 20 | // |
| 21 | TPM_RC |
| 22 | TPM2_ECDH_ZGen( |
| 23 | ECDH_ZGen_In *in, // IN: input parameter list |
| 24 | ECDH_ZGen_Out *out // OUT: output parameter list |
| 25 | ) |
| 26 | { |
| 27 | TPM_RC result; |
| 28 | OBJECT *eccKey; |
| 29 | |
| 30 | // Input Validation |
| 31 | |
| 32 | eccKey = ObjectGet(in->keyHandle); |
| 33 | |
| 34 | // Input key must be a non-restricted, decrypt ECC key |
| 35 | if( eccKey->publicArea.type != TPM_ALG_ECC) |
| Vadim Bendebury | 065e0d7 | 2015-10-16 09:35:42 -0700 | [diff] [blame] | 36 | return TPM_RC_KEY + RC_ECDH_ZGen_keyHandle; |
| Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 37 | |
| 38 | if( eccKey->publicArea.objectAttributes.restricted == SET |
| 39 | || eccKey->publicArea.objectAttributes.decrypt != SET |
| 40 | ) |
| 41 | return TPM_RC_KEY + RC_ECDH_ZGen_keyHandle; |
| 42 | |
| 43 | // Make sure the scheme allows this use |
| 44 | if( eccKey->publicArea.parameters.eccDetail.scheme.scheme != TPM_ALG_ECDH |
| 45 | && eccKey->publicArea.parameters.eccDetail.scheme.scheme != TPM_ALG_NULL) |
| 46 | return TPM_RC_SCHEME + RC_ECDH_ZGen_keyHandle; |
| 47 | |
| 48 | // Command Output |
| 49 | |
| 50 | // Compute Z. TPM_RC_ECC_POINT or TPM_RC_NO_RESULT may be returned here. |
| 51 | result = CryptEccPointMultiply(&out->outPoint.t.point, |
| 52 | eccKey->publicArea.parameters.eccDetail.curveID, |
| 53 | &eccKey->sensitive.sensitive.ecc, |
| 54 | &in->inPoint.t.point); |
| 55 | if(result != TPM_RC_SUCCESS) |
| 56 | return RcSafeAddToResult(result, RC_ECDH_ZGen_inPoint); |
| 57 | |
| 58 | out->outPoint.t.size = TPMS_ECC_POINT_Marshal(&out->outPoint.t.point, |
| 59 | NULL, NULL); |
| 60 | |
| 61 | return TPM_RC_SUCCESS; |
| 62 | } |
| 63 | #endif |