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/*
* Licensed Materials - Property of IBM
*
* trousers - An open source TCG Software Stack
*
* (C) Copyright International Business Machines Corp. 2007
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#ifndef TSS_BUILD_ASN1_OPENSSL
#include <arpa/inet.h>
#endif
#include "trousers/tss.h"
#include "trousers/trousers.h"
#include "trousers_types.h"
#include "tsplog.h"
#define TSS_OPENSSL_ASN1_ERROR (0xffffffff)
#if (OPENSSL_VERSION_NUMBER >= 0x0090800FL)
#define OPENSSL_COMPAT_CONST const
#else
#define OPENSSL_COMPAT_CONST
#endif
#define OPENSSL_COMPAT_ASN1_SEQUENCE(tname) \
static const ASN1_TEMPLATE tname##_seq_tt[]
typedef struct tdTSS_BLOB {
ASN1_INTEGER * structVersion;
ASN1_INTEGER * blobType;
ASN1_INTEGER * blobLength;
ASN1_OCTET_STRING * blob;
} TSS_BLOB;
OPENSSL_COMPAT_ASN1_SEQUENCE(TSS_BLOB) = {
ASN1_SIMPLE(TSS_BLOB, structVersion, ASN1_INTEGER),
ASN1_SIMPLE(TSS_BLOB, blobType, ASN1_INTEGER),
ASN1_SIMPLE(TSS_BLOB, blobLength, ASN1_INTEGER),
ASN1_SIMPLE(TSS_BLOB, blob, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(TSS_BLOB)
IMPLEMENT_ASN1_FUNCTIONS(TSS_BLOB)
TSS_RESULT
Tspi_EncodeDER_TssBlob(UINT32 rawBlobSize, /* in */
BYTE *rawBlob, /* in */
UINT32 blobType, /* in */
UINT32 *derBlobSize, /* in/out */
BYTE *derBlob) /* out */
{
#ifdef TSS_BUILD_ASN1_OPENSSL
TSS_BLOB *tssBlob = NULL;
#endif
BYTE *encBlob = NULL;
UINT32 encBlobLen;
if ((rawBlobSize == 0) || (rawBlob == NULL))
return TSPERR(TSS_E_BAD_PARAMETER);
if ((blobType < TSS_BLOB_TYPE_KEY) || (blobType > TSS_BLOB_TYPE_CMK_BYTE_STREAM))
return TSPERR(TSS_E_BAD_PARAMETER);
if ((*derBlobSize != 0) && (derBlob == NULL))
return TSPERR(TSS_E_BAD_PARAMETER);
/* The TSS working group has stated that the ASN1 encoding will be done in a
* specific way that generates an ASN1 encoding that is exactly 20 bytes
* larger than the blob being encoded.
*
* OpenSSL uses the smallest number of bytes possible to encode and object
* and as a result cannot be used to perform the encoding. The encoding
* must be done manually.
*
* The 20 byte fixed header will result in issues for objects greater than
* 2^16 in size since some fields are now limited to 16-bit lengths.
*/
#ifdef TSS_BUILD_ASN1_OPENSSL
tssBlob = TSS_BLOB_new();
if (!tssBlob)
return TSPERR(TSS_E_OUTOFMEMORY);
if (ASN1_INTEGER_set(tssBlob->structVersion, TSS_BLOB_STRUCT_VERSION) == 0) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_OUTOFMEMORY);
}
if (ASN1_INTEGER_set(tssBlob->blobType, blobType) == 0) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_OUTOFMEMORY);
}
if (ASN1_INTEGER_set(tssBlob->blobLength, rawBlobSize) == 0) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_OUTOFMEMORY);
}
if (ASN1_OCTET_STRING_set(tssBlob->blob, rawBlob, rawBlobSize) == 0) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_OUTOFMEMORY);
}
encBlobLen = i2d_TSS_BLOB(tssBlob, &encBlob);
if (encBlobLen <= 0) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_INTERNAL_ERROR);
}
if (*derBlobSize != 0) {
if (encBlobLen <= *derBlobSize) {
memcpy(derBlob, encBlob, encBlobLen);
}
else {
OPENSSL_free(encBlob);
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_BAD_PARAMETER);
}
}
*derBlobSize = encBlobLen;
OPENSSL_free(encBlob);
TSS_BLOB_free(tssBlob);
#else
if ((rawBlobSize + 16) > UINT16_MAX)
return TSPERR(TSS_E_INTERNAL_ERROR);
encBlobLen = rawBlobSize + 20;
if (*derBlobSize != 0) {
if (encBlobLen <= *derBlobSize) {
UINT16 *pShort;
UINT32 *pLong;
encBlob = derBlob;
encBlob[0] = 0x30; /* Sequence tag */
encBlob[1] = 0x82; /* Length in the two octets that follow */
encBlob += 2;
pShort = (UINT16 *)encBlob;
*pShort = htons(rawBlobSize + 16);
encBlob += sizeof(UINT16);
encBlob[0] = 0x02; /* Integer tag */
encBlob[1] = 0x01; /* Length is one */
encBlob[2] = (BYTE)TSS_BLOB_STRUCT_VERSION;
encBlob += 3;
encBlob[0] = 0x02; /* Integer tag */
encBlob[1] = 0x01; /* Length is one */
encBlob[2] = (BYTE)blobType;
encBlob += 3;
encBlob[0] = 0x02; /* Integer tag */
encBlob[1] = 0x04; /* Length is four */
encBlob += 2;
pLong = (UINT32 *)encBlob;
*pLong = htonl(rawBlobSize);
encBlob += sizeof(UINT32);
encBlob[0] = 0x04; /* Octet string tag */
encBlob[1] = 0x82; /* Length in the two octets that follow */
encBlob += 2;
pShort = (UINT16 *)encBlob;
*pShort = htons(rawBlobSize);
encBlob += sizeof(UINT16);
memcpy(encBlob, rawBlob, rawBlobSize);
}
else
return TSPERR(TSS_E_BAD_PARAMETER);
}
*derBlobSize = encBlobLen;
#endif
return TSS_SUCCESS;
}
TSS_RESULT
Tspi_DecodeBER_TssBlob(UINT32 berBlobSize, /* in */
BYTE *berBlob, /* in */
UINT32 *blobType, /* out */
UINT32 *rawBlobSize, /* in/out */
BYTE *rawBlob) /* out */
{
TSS_BLOB *tssBlob = NULL;
OPENSSL_COMPAT_CONST BYTE *encBlob = berBlob;
UINT32 encBlobLen = berBlobSize;
UINT32 decStructVersion, decBlobType, decBlobSize;
if ((berBlobSize == 0) || (berBlob == NULL))
return TSPERR(TSS_E_BAD_PARAMETER);
if ((*rawBlobSize != 0) && (rawBlob == NULL))
return TSPERR(TSS_E_BAD_PARAMETER);
tssBlob = d2i_TSS_BLOB(NULL, &encBlob, encBlobLen);
if (!tssBlob)
return TSPERR(TSS_E_INTERNAL_ERROR);
decStructVersion = ASN1_INTEGER_get(tssBlob->structVersion);
if (decStructVersion == TSS_OPENSSL_ASN1_ERROR) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_INTERNAL_ERROR);
}
if (decStructVersion > TSS_BLOB_STRUCT_VERSION) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_BAD_PARAMETER);
}
decBlobType = ASN1_INTEGER_get(tssBlob->blobType);
if (decBlobType == TSS_OPENSSL_ASN1_ERROR) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_INTERNAL_ERROR);
}
if ((decBlobType < TSS_BLOB_TYPE_KEY) || (decBlobType > TSS_BLOB_TYPE_CMK_BYTE_STREAM)) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_BAD_PARAMETER);
}
decBlobSize = ASN1_INTEGER_get(tssBlob->blobLength);
if (decBlobSize == TSS_OPENSSL_ASN1_ERROR) {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_INTERNAL_ERROR);
}
if (*rawBlobSize != 0) {
if (decBlobSize <= *rawBlobSize) {
memcpy(rawBlob, tssBlob->blob->data, decBlobSize);
}
else {
TSS_BLOB_free(tssBlob);
return TSPERR(TSS_E_BAD_PARAMETER);
}
}
*rawBlobSize = decBlobSize;
*blobType = decBlobType;
TSS_BLOB_free(tssBlob);
return TSS_SUCCESS;
}
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