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 "Sign_fp.h" |
| 10 | #include "Attest_spt_fp.h" |
| 11 | // |
| 12 | // |
| 13 | // Error Returns Meaning |
| 14 | // |
| 15 | // TPM_RC_BINDING The public and private portions of the key are not properly bound. |
| 16 | // TPM_RC_KEY signHandle does not reference a signing key; |
| 17 | // TPM_RC_SCHEME the scheme is not compatible with sign key type, or input scheme is |
| 18 | // not compatible with default scheme, or the chosen scheme is not a |
| 19 | // valid sign scheme |
| 20 | // TPM_RC_TICKET validation is not a valid ticket |
| 21 | // TPM_RC_VALUE the value to sign is larger than allowed for the type of keyHandle |
| 22 | // |
| 23 | TPM_RC |
| 24 | TPM2_Sign( |
| 25 | Sign_In *in, // IN: input parameter list |
| 26 | Sign_Out *out // OUT: output parameter list |
| 27 | ) |
| 28 | { |
| 29 | TPM_RC result; |
| 30 | TPMT_TK_HASHCHECK ticket; |
| 31 | OBJECT *signKey; |
| 32 | |
| 33 | // Input Validation |
| 34 | // Get sign key pointer |
| 35 | signKey = ObjectGet(in->keyHandle); |
| 36 | |
| 37 | // pick a scheme for sign. If the input sign scheme is not compatible with |
| 38 | // the default scheme, return an error. |
| 39 | result = CryptSelectSignScheme(in->keyHandle, &in->inScheme); |
| 40 | if(result != TPM_RC_SUCCESS) |
| 41 | { |
| 42 | if(result == TPM_RC_KEY) |
| 43 | return TPM_RC_KEY + RC_Sign_keyHandle; |
| 44 | else |
| 45 | return RcSafeAddToResult(result, RC_Sign_inScheme); |
| 46 | } |
| 47 | |
| 48 | // If validation is provided, or the key is restricted, check the ticket |
| 49 | if( in->validation.digest.t.size != 0 |
| 50 | || signKey->publicArea.objectAttributes.restricted == SET) |
| 51 | { |
| 52 | // Compute and compare ticket |
| 53 | TicketComputeHashCheck(in->validation.hierarchy, |
| 54 | in->inScheme.details.any.hashAlg, |
| 55 | &in->digest, &ticket); |
| 56 | |
| 57 | if(!Memory2BEqual(&in->validation.digest.b, &ticket.digest.b)) |
| 58 | return TPM_RC_TICKET + RC_Sign_validation; |
| 59 | } |
| 60 | else |
| 61 | // If we don't have a ticket, at least verify that the provided 'digest' |
| 62 | // is the size of the scheme hashAlg digest. |
| 63 | // NOTE: this does not guarantee that the 'digest' is actually produced using |
| 64 | // the indicated hash algorithm, but at least it might be. |
| 65 | { |
| 66 | if( in->digest.t.size |
| 67 | != CryptGetHashDigestSize(in->inScheme.details.any.hashAlg)) |
Vadim Bendebury | 065e0d7 | 2015-10-16 09:35:42 -0700 | [diff] [blame] | 68 | return TPM_RC_SIZE + RC_Sign_digest; |
Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | // Command Output |
| 72 | // Sign the hash. A TPM_RC_VALUE or TPM_RC_SCHEME |
| 73 | // error may be returned at this point |
| 74 | result = CryptSign(in->keyHandle, &in->inScheme, &in->digest, &out->signature); |
| 75 | |
| 76 | return result; |
| 77 | } |