library/padlock.h

/**
 * \file padlock.h
 *
 * \brief VIA PadLock ACE for HW encryption/decryption supported by some
 *        processors
 *
 * \warning These functions are only for internal use by other library
 *          functions; you must not call them directly.
 */
/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */
#ifndef MBEDTLS_PADLOCK_H
#define MBEDTLS_PADLOCK_H

#include "mbedtls/build_info.h"

#include "mbedtls/aes.h"

#define MBEDTLS_ERR_PADLOCK_DATA_MISALIGNED               -0x0030  /**< Input data should be aligned. */

#if defined(__has_feature)
#if __has_feature(address_sanitizer)
#define MBEDTLS_HAVE_ASAN
#endif
#endif

/*
 * - `padlock` is implements with GNUC assembly for x86 target.
 * - Some versions of ASan result in errors about not enough registers.
 */
#if defined(MBEDTLS_PADLOCK_C) && \
    defined(__GNUC__) && defined(MBEDTLS_ARCH_IS_X86) && \
    defined(MBEDTLS_HAVE_ASM) && \
    !defined(MBEDTLS_HAVE_ASAN)

#define MBEDTLS_VIA_PADLOCK_HAVE_CODE

#include <stdint.h>

#define MBEDTLS_PADLOCK_RNG 0x000C
#define MBEDTLS_PADLOCK_ACE 0x00C0
#define MBEDTLS_PADLOCK_PHE 0x0C00
#define MBEDTLS_PADLOCK_PMM 0x3000

#define MBEDTLS_PADLOCK_ALIGN16(x) (uint32_t *) (16 + ((int32_t) (x) & ~15))

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief          Internal PadLock detection routine
 *
 * \note           This function is only for internal use by other library
 *                 functions; you must not call it directly.
 *
 * \param feature  The feature to detect
 *
 * \return         non-zero if CPU has support for the feature, 0 otherwise
 */
int mbedtls_padlock_has_support(int feature);

/**
 * \brief          Internal PadLock AES-ECB block en(de)cryption
 *
 * \note           This function is only for internal use by other library
 *                 functions; you must not call it directly.
 *
 * \param ctx      AES context
 * \param mode     MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
 * \param input    16-byte input block
 * \param output   16-byte output block
 *
 * \return         0 if success, 1 if operation failed
 */
int mbedtls_padlock_xcryptecb(mbedtls_aes_context *ctx,
                              int mode,
                              const unsigned char input[16],
                              unsigned char output[16]);

/**
 * \brief          Internal PadLock AES-CBC buffer en(de)cryption
 *
 * \note           This function is only for internal use by other library
 *                 functions; you must not call it directly.
 *
 * \param ctx      AES context
 * \param mode     MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
 * \param length   length of the input data
 * \param iv       initialization vector (updated after use)
 * \param input    buffer holding the input data
 * \param output   buffer holding the output data
 *
 * \return         0 if success, 1 if operation failed
 */
int mbedtls_padlock_xcryptcbc(mbedtls_aes_context *ctx,
                              int mode,
                              size_t length,
                              unsigned char iv[16],
                              const unsigned char *input,
                              unsigned char *output);

#ifdef __cplusplus
}
#endif

#endif /* HAVE_X86  */

#endif /* padlock.h */