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 "VerifySignature_fp.h" |
| 10 | // |
| 11 | // |
| 12 | // Error Returns Meaning |
| 13 | // |
| 14 | // TPM_RC_ATTRIBUTES keyHandle does not reference a signing key |
| 15 | // TPM_RC_SIGNATURE signature is not genuine |
| 16 | // TPM_RC_SCHEME CryptVerifySignature() |
| 17 | // TPM_RC_HANDLE the input handle is references an HMAC key but the private portion is |
| 18 | // not loaded |
| 19 | // |
| 20 | TPM_RC |
| 21 | TPM2_VerifySignature( |
| 22 | VerifySignature_In *in, // IN: input parameter list |
| 23 | VerifySignature_Out *out // OUT: output parameter list |
| 24 | ) |
| 25 | { |
| 26 | TPM_RC result; |
| 27 | TPM2B_NAME name; |
| 28 | OBJECT *signObject; |
| 29 | TPMI_RH_HIERARCHY hierarchy; |
| 30 | |
| 31 | // Input Validation |
| 32 | |
| 33 | // Get sign object pointer |
| 34 | signObject = ObjectGet(in->keyHandle); |
| 35 | |
| 36 | // The object to validate the signature must be a signing key. |
| 37 | if(signObject->publicArea.objectAttributes.sign != SET) |
| 38 | return TPM_RC_ATTRIBUTES + RC_VerifySignature_keyHandle; |
| 39 | |
| 40 | // Validate Signature. TPM_RC_SCHEME, TPM_RC_HANDLE or TPM_RC_SIGNATURE |
| 41 | // error may be returned by CryptCVerifySignatrue() |
| 42 | result = CryptVerifySignature(in->keyHandle, &in->digest, &in->signature); |
| 43 | if(result != TPM_RC_SUCCESS) |
| 44 | return RcSafeAddToResult(result, RC_VerifySignature_signature); |
| 45 | |
| 46 | // Command Output |
| 47 | |
| 48 | hierarchy = ObjectGetHierarchy(in->keyHandle); |
| 49 | if( hierarchy == TPM_RH_NULL |
| 50 | || signObject->publicArea.nameAlg == TPM_ALG_NULL) |
| 51 | { |
| 52 | // produce empty ticket if hierarchy is TPM_RH_NULL or nameAlg is |
| 53 | // TPM_ALG_NULL |
| 54 | out->validation.tag = TPM_ST_VERIFIED; |
| 55 | out->validation.hierarchy = TPM_RH_NULL; |
| 56 | out->validation.digest.t.size = 0; |
| 57 | } |
| 58 | else |
| 59 | { |
| 60 | // Get object name that verifies the signature |
ChromeOS Developer | e85c65b | 2015-07-10 10:12:43 -0700 | [diff] [blame] | 61 | name.t.size = ObjectGetName(in->keyHandle, &name.t.name); |
Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 62 | // Compute ticket |
| 63 | TicketComputeVerified(hierarchy, &in->digest, &name, &out->validation); |
| 64 | } |
| 65 | |
| 66 | return TPM_RC_SUCCESS; |
| 67 | } |