128 lines
5.2 KiB
C
128 lines
5.2 KiB
C
// This file was extracted from the TCG Published
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// Trusted Platform Module Library
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// Part 3: Commands
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// Family "2.0"
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// Level 00 Revision 01.16
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// October 30, 2014
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#include "InternalRoutines.h"
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#include "Rewrap_fp.h"
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#include "Object_spt_fp.h"
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//
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//
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// Error Returns Meaning
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//
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// TPM_RC_ATTRIBUTES newParent is not a decryption key
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// TPM_RC_HANDLE oldParent does not consistent with inSymSeed
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// TPM_RC_INTEGRITY the integrity check of inDuplicate failed
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// TPM_RC_KEY for an ECC key, the public key is not on the curve of the curve ID
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// TPM_RC_KEY_SIZE the decrypted input symmetric key size does not matches the
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// symmetric algorithm key size of oldParent
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// TPM_RC_TYPE oldParent is not a storage key, or 'newParent is not a storage key
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// TPM_RC_VALUE for an 'oldParent; RSA key, the data to be decrypted is greater than
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// the public exponent
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// Unmarshal errors errors during unmarshaling the input encrypted buffer to a ECC public
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// key, or unmarshal the private buffer to sensitive
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//
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TPM_RC
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TPM2_Rewrap(
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Rewrap_In *in, // IN: input parameter list
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Rewrap_Out *out // OUT: output parameter list
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)
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{
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TPM_RC result = TPM_RC_SUCCESS;
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OBJECT *oldParent;
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TPM2B_DATA data; // symmetric key
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UINT16 hashSize = 0;
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TPM2B_PRIVATE privateBlob; // A temporary private blob
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// to transit between old
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// and new wrappers
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// Input Validation
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if((in->inSymSeed.t.size == 0 && in->oldParent != TPM_RH_NULL)
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|| (in->inSymSeed.t.size != 0 && in->oldParent == TPM_RH_NULL))
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return TPM_RC_HANDLE + RC_Rewrap_oldParent;
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if(in->oldParent != TPM_RH_NULL)
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{
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// Get old parent pointer
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oldParent = ObjectGet(in->oldParent);
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// old parent key must be a storage object
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if(!ObjectIsStorage(in->oldParent))
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return TPM_RC_TYPE + RC_Rewrap_oldParent;
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// Decrypt input secret data via asymmetric decryption. A
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// TPM_RC_VALUE, TPM_RC_KEY or unmarshal errors may be returned at this
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// point
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result = CryptSecretDecrypt(in->oldParent, NULL,
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"DUPLICATE", &in->inSymSeed, &data);
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if(result != TPM_RC_SUCCESS)
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return TPM_RC_VALUE + RC_Rewrap_inSymSeed;
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// Unwrap Outer
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result = UnwrapOuter(in->oldParent, &in->name,
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oldParent->publicArea.nameAlg, (TPM2B_SEED *) &data,
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FALSE,
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in->inDuplicate.t.size, in->inDuplicate.t.buffer);
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if(result != TPM_RC_SUCCESS)
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return RcSafeAddToResult(result, RC_Rewrap_inDuplicate);
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// Copy unwrapped data to temporary variable, remove the integrity field
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hashSize = sizeof(UINT16) +
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CryptGetHashDigestSize(oldParent->publicArea.nameAlg);
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privateBlob.t.size = in->inDuplicate.t.size - hashSize;
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MemoryCopy(privateBlob.t.buffer, in->inDuplicate.t.buffer + hashSize,
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privateBlob.t.size, sizeof(privateBlob.t.buffer));
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}
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else
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{
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// No outer wrap from input blob. Direct copy.
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privateBlob = in->inDuplicate;
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}
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if(in->newParent != TPM_RH_NULL)
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{
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OBJECT *newParent;
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newParent = ObjectGet(in->newParent);
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// New parent must be a storage object
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if(!ObjectIsStorage(in->newParent))
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return TPM_RC_TYPE + RC_Rewrap_newParent;
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// Make new encrypt key and its associated secret structure. A
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// TPM_RC_VALUE error may be returned at this point if RSA algorithm is
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// enabled in TPM
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out->outSymSeed.t.size = sizeof(out->outSymSeed.t.secret);
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result = CryptSecretEncrypt(in->newParent,
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"DUPLICATE", &data, &out->outSymSeed);
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if(result != TPM_RC_SUCCESS) return result;
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// Command output
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// Copy temporary variable to output, reserve the space for integrity
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hashSize = sizeof(UINT16) +
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CryptGetHashDigestSize(newParent->publicArea.nameAlg);
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out->outDuplicate.t.size = privateBlob.t.size;
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MemoryCopy(out->outDuplicate.t.buffer + hashSize, privateBlob.t.buffer,
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privateBlob.t.size, sizeof(out->outDuplicate.t.buffer));
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// Produce outer wrapper for output
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out->outDuplicate.t.size = ProduceOuterWrap(in->newParent, &in->name,
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newParent->publicArea.nameAlg,
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(TPM2B_SEED *) &data,
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FALSE,
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out->outDuplicate.t.size,
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out->outDuplicate.t.buffer);
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}
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else // New parent is a null key so there is no seed
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{
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out->outSymSeed.t.size = 0;
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// Copy privateBlob directly
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out->outDuplicate = privateBlob;
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}
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return TPM_RC_SUCCESS;
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}
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