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 "HMAC_Start_fp.h" |
| 10 | // |
| 11 | // |
| 12 | // Error Returns Meaning |
| 13 | // |
| 14 | // TPM_RC_ATTRIBUTES key referenced by handle is not a signing key or is restricted |
| 15 | // TPM_RC_OBJECT_MEMORY no space to create an internal object |
| 16 | // TPM_RC_KEY key referenced by handle is not an HMAC key |
| 17 | // TPM_RC_VALUE hashAlg is not compatible with the hash algorithm of the scheme of |
| 18 | // the object referenced by handle |
| 19 | // |
| 20 | TPM_RC |
| 21 | TPM2_HMAC_Start( |
| 22 | HMAC_Start_In *in, // IN: input parameter list |
| 23 | HMAC_Start_Out *out // OUT: output parameter list |
| 24 | ) |
| 25 | { |
| 26 | OBJECT *hmacObject; |
| 27 | TPMT_PUBLIC *publicArea; |
| 28 | TPM_ALG_ID hashAlg; |
| 29 | |
| 30 | // Input Validation |
| 31 | |
| 32 | // Get HMAC key object and public area pointers |
| 33 | hmacObject = ObjectGet(in->handle); |
| 34 | publicArea = &hmacObject->publicArea; |
| 35 | |
| 36 | // Make sure that the key is an HMAC key |
| 37 | if(publicArea->type != TPM_ALG_KEYEDHASH) |
| 38 | return TPM_RCS_TYPE + RC_HMAC_Start_handle; |
| 39 | |
| 40 | // and that it is unrestricted |
| 41 | if(publicArea->objectAttributes.restricted == SET) |
| 42 | return TPM_RCS_ATTRIBUTES + RC_HMAC_Start_handle; |
| 43 | |
| 44 | // and that it is a signing key |
| 45 | if(publicArea->objectAttributes.sign != SET) |
| 46 | return TPM_RCS_KEY + RC_HMAC_Start_handle; |
| 47 | |
| 48 | // See if the key has a default |
| 49 | if(publicArea->parameters.keyedHashDetail.scheme.scheme == TPM_ALG_NULL) |
| 50 | // it doesn't so use the input value |
| 51 | hashAlg = in->hashAlg; |
| 52 | else |
| 53 | { |
| 54 | // key has a default so use it |
| 55 | hashAlg |
| 56 | = publicArea->parameters.keyedHashDetail.scheme.details.hmac.hashAlg; |
| 57 | // and verify that the input was either the TPM_ALG_NULL or the default |
| 58 | if(in->hashAlg != TPM_ALG_NULL && in->hashAlg != hashAlg) |
| 59 | hashAlg = TPM_ALG_NULL; |
| 60 | } |
| 61 | // if we ended up without a hash algorith then return an error |
| 62 | if(hashAlg == TPM_ALG_NULL) |
| 63 | return TPM_RCS_VALUE + RC_HMAC_Start_hashAlg; |
| 64 | |
| 65 | // Internal Data Update |
| 66 | |
| 67 | // Create a HMAC sequence object. A TPM_RC_OBJECT_MEMORY error may be |
| 68 | // returned at this point |
| 69 | return ObjectCreateHMACSequence(hashAlg, |
| 70 | in->handle, |
| 71 | &in->auth, |
| 72 | &out->sequenceHandle); |
| 73 | } |