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/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef TPM_LITE_TLCL_INTERNAL_H_
#define TPM_LITE_TLCL_INTERNAL_H_
/*
* These numbers derive from adding the sizes of command fields as shown in the
* TPM commands manual.
*/
#define kTpmRequestHeaderLength 10
#define kTpmResponseHeaderLength 10
#define kTpmReadInfoLength 12
#define kEncAuthLength 20
#define kPcrDigestLength 20
/*
* Conversion functions. ToTpmTYPE puts a value of type TYPE into a TPM
* command buffer. FromTpmTYPE gets a value of type TYPE from a TPM command
* buffer into a variable. ReadTpmTYPE reads a value of type TYPE from a buffer
* and advances the buffer pointer to after the field.
*/
__attribute__((unused))
static inline void ToTpmUint32(uint8_t *buffer, uint32_t x) {
buffer[0] = (uint8_t)(x >> 24);
buffer[1] = (uint8_t)((x >> 16) & 0xff);
buffer[2] = (uint8_t)((x >> 8) & 0xff);
buffer[3] = (uint8_t)(x & 0xff);
}
/*
* See comment for above function.
*/
__attribute__((unused))
static inline void FromTpmUint32(const uint8_t *buffer, uint32_t *x) {
*x = ((buffer[0] << 24) |
(buffer[1] << 16) |
(buffer[2] << 8) |
buffer[3]);
}
/*
* See comment for above function.
*/
__attribute__((unused))
static inline uint32_t ReadTpmUint32(const uint8_t **buffer) {
uint32_t value;
FromTpmUint32(*buffer, &value);
*buffer += sizeof(value);
return value;
}
/*
* See comment for above function.
*/
__attribute__((unused))
static inline void ToTpmUint16(uint8_t *buffer, uint16_t x) {
buffer[0] = (uint8_t)(x >> 8);
buffer[1] = (uint8_t)(x & 0xff);
}
/*
* See comment for above function.
*/
__attribute__((unused))
static inline void FromTpmUint16(const uint8_t *buffer, uint16_t *x) {
*x = (buffer[0] << 8) | buffer[1];
}
/*
* See comment for above function.
*/
__attribute__((unused))
static inline uint16_t ReadTpmUint16(const uint8_t **buffer) {
uint16_t value;
FromTpmUint16(*buffer, &value);
*buffer += sizeof(value);
return value;
}
#endif /* TPM_LITE_TLCL_INTERNAL_H_ */
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