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/*
* Licensed Materials - Property of IBM
*
* trousers - An open source TCG Software Stack
*
* (C) Copyright International Business Machines Corp. 2004-2006
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "trousers/tss.h"
#include "trousers/trousers.h"
#include "trousers_types.h"
#include "spi_utils.h"
#include "capabilities.h"
#include "tsplog.h"
#include "obj.h"
TSS_RESULT
Tspi_Hash_Sign(TSS_HHASH hHash, /* in */
TSS_HKEY hKey, /* in */
UINT32 * pulSignatureLength, /* out */
BYTE ** prgbSignature) /* out */
{
TPM_AUTH privAuth;
TPM_AUTH *pPrivAuth = &privAuth;
TCPA_DIGEST digest;
TCPA_RESULT result;
TSS_HPOLICY hPolicy;
TCS_KEY_HANDLE tcsKeyHandle;
TSS_BOOL usesAuth;
TSS_HCONTEXT tspContext;
UINT32 ulDataLen;
BYTE *data;
Trspi_HashCtx hashCtx;
if (pulSignatureLength == NULL || prgbSignature == NULL)
return TSPERR(TSS_E_BAD_PARAMETER);
if ((result = obj_hash_get_tsp_context(hHash, &tspContext)))
return result;
if ((result = obj_rsakey_get_policy(hKey, TSS_POLICY_USAGE, &hPolicy, &usesAuth)))
return result;
if ((result = obj_hash_get_value(hHash, &ulDataLen, &data)))
return result;
if ((result = obj_rsakey_get_tcs_handle(hKey, &tcsKeyHandle)))
goto done;
if (usesAuth) {
result = Trspi_HashInit(&hashCtx, TSS_HASH_SHA1);
result |= Trspi_Hash_UINT32(&hashCtx, TPM_ORD_Sign);
result |= Trspi_Hash_UINT32(&hashCtx, ulDataLen);
result |= Trspi_HashUpdate(&hashCtx, ulDataLen, data);
if ((result |= Trspi_HashFinal(&hashCtx, digest.digest)))
goto done;
pPrivAuth = &privAuth;
if ((result = secret_PerformAuth_OIAP(hKey, TPM_ORD_Sign, hPolicy, FALSE, &digest,
&privAuth)))
goto done;
} else {
pPrivAuth = NULL;
}
if ((result = TCS_API(tspContext)->Sign(tspContext, tcsKeyHandle, ulDataLen, data,
pPrivAuth, pulSignatureLength, prgbSignature)))
goto done;
if (usesAuth) {
result = Trspi_HashInit(&hashCtx, TSS_HASH_SHA1);
result |= Trspi_Hash_UINT32(&hashCtx, result);
result |= Trspi_Hash_UINT32(&hashCtx, TPM_ORD_Sign);
result |= Trspi_Hash_UINT32(&hashCtx, *pulSignatureLength);
result |= Trspi_HashUpdate(&hashCtx, *pulSignatureLength, *prgbSignature);
if ((result |= Trspi_HashFinal(&hashCtx, digest.digest))) {
free(*prgbSignature);
goto done;
}
if ((result = obj_policy_validate_auth_oiap(hPolicy, &digest, &privAuth))) {
free(*prgbSignature);
goto done;
}
}
if ((result = __tspi_add_mem_entry(tspContext, *prgbSignature)))
free(*prgbSignature);
done:
free_tspi(tspContext, data);
return result;
}
TSS_RESULT
Tspi_Hash_VerifySignature(TSS_HHASH hHash, /* in */
TSS_HKEY hKey, /* in */
UINT32 ulSignatureLength, /* in */
BYTE * rgbSignature) /* in */
{
TCPA_RESULT result;
BYTE *pubKey = NULL;
UINT32 pubKeySize;
BYTE *hashData = NULL;
UINT32 hashDataSize;
UINT32 sigScheme;
TSS_HCONTEXT tspContext;
if (ulSignatureLength > 0 && rgbSignature == NULL)
return TSPERR(TSS_E_BAD_PARAMETER);
if ((result = obj_rsakey_get_tsp_context(hKey, &tspContext)))
return result;
if ((result = obj_rsakey_get_modulus(hKey, &pubKeySize, &pubKey)))
return result;
if ((result = obj_rsakey_get_ss(hKey, &sigScheme))) {
free_tspi(tspContext, pubKey);
return result;
}
if ((result = obj_hash_get_value(hHash, &hashDataSize, &hashData))) {
free_tspi(tspContext, pubKey);
return result;
}
if (sigScheme == TSS_SS_RSASSAPKCS1V15_SHA1) {
result = Trspi_Verify(TSS_HASH_SHA1, hashData, hashDataSize, pubKey, pubKeySize,
rgbSignature, ulSignatureLength);
} else if (sigScheme == TSS_SS_RSASSAPKCS1V15_DER) {
result = Trspi_Verify(TSS_HASH_OTHER, hashData, hashDataSize, pubKey, pubKeySize,
rgbSignature, ulSignatureLength);
} else {
result = TSPERR(TSS_E_INVALID_SIGSCHEME);
}
free_tspi(tspContext, pubKey);
free_tspi(tspContext, hashData);
return result;
}
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