src/lib/tlcl_internal.h

   1 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
   2  * Use of this source code is governed by a BSD-style license that can be
   3  * found in the LICENSE file.
   4  */
   5
   6 #ifndef TPM_LITE_TLCL_INTERNAL_H_
   7 #define TPM_LITE_TLCL_INTERNAL_H_
   8
   9 /*
  10  * These numbers derive from adding the sizes of command fields as shown in the
  11  * TPM commands manual.
  12  */
  13 #define kTpmRequestHeaderLength 10
  14 #define kTpmResponseHeaderLength 10
  15 #define kTpmReadInfoLength 12
  16 #define kEncAuthLength 20
  17 #define kPcrDigestLength 20
  18
  19
  20 /*
  21  * Conversion functions.  to_tpm_TYPE puts a value of type TYPE into a TPM
  22  * command buffer. from_tpm_TYPE gets a value of type TYPE from a TPM command
  23  * buffer into a variable.
  24  */
  25 __attribute__((unused))
  26 static inline void to_tpm_uint32(uint8_t *buffer, uint32_t x)
  27 {
  28         buffer[0] = (uint8_t)(x >> 24);
  29         buffer[1] = (uint8_t)((x >> 16) & 0xff);
  30         buffer[2] = (uint8_t)((x >> 8) & 0xff);
  31         buffer[3] = (uint8_t)(x & 0xff);
  32 }
  33
  34 /*
  35  * See comment for above function.
  36  */
  37 __attribute__((unused))
  38 static inline void from_tpm_uint32(const uint8_t *buffer, uint32_t *x)
  39 {
  40         *x = ((buffer[0] << 24) |
  41               (buffer[1] << 16) |
  42               (buffer[2] << 8) |
  43               buffer[3]);
  44 }
  45
  46 /*
  47  * See comment for above function.
  48  */
  49 __attribute__((unused))
  50 static inline void to_tpm_uint16(uint8_t *buffer, uint16_t x)
  51 {
  52         buffer[0] = (uint8_t)(x >> 8);
  53         buffer[1] = (uint8_t)(x & 0xff);
  54 }
  55
  56 /*
  57  * See comment for above function.
  58  */
  59 __attribute__((unused))
  60 static inline void from_tpm_uint16(const uint8_t *buffer, uint16_t *x)
  61 {
  62         *x = (buffer[0] << 8) | buffer[1];
  63 }
  64
  65 #endif  /* TPM_LITE_TLCL_INTERNAL_H_ */