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Updates to the atmel.c code to allow easier customization of the hardware interface.

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This commit is contained in:
David Garske 2018-09-27 15:41:58 -07:00
parent bb737ec99d
commit 177bf49fa6
3 changed files with 28 additions and 3 deletions
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5
configure.ac
View File

@ -817,11 +817,16 @@ AC_ARG_WITH([cryptoauthlib],
AC_MSG_ERROR([cryptoauthlib isn't found.
If it's already installed, specify its path using --with-cryptoauthlib=/dir/])
fi
AM_LDFLAGS="$AM_LDFLAGS -L$trylibatcadir/lib"
AM_CFLAGS="$AM_CFLAGS -I$trylibatcadir/lib"
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([yes])
fi
ENABLED_CRYPTOAUTHLIB="yes"
AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_ATECC508A"
]
)
AM_CONDITIONAL([BUILD_CRYPTOAUTHLIB], [test "x$ENABLED_CRYPTOAUTHLIB" = "xyes"])

23
wolfcrypt/src/port/atmel/atmel.c
View File

@ -62,6 +62,17 @@ static byte mSlotList[ATECC_MAX_SLOT];
static wolfSSL_Mutex mSlotMutex;
#endif
/* Raspberry Pi uses /dev/i2c-1 */
#ifndef ATECC_I2C_ADDR
#define ATECC_I2C_ADDR 0xC0
#endif
#ifndef ATECC_I2C_BUS
#define ATECC_I2C_BUS 1
#endif
#ifndef ATECC_DEV_TYPE
#define ATECC_DEV_TYPE ATECC508A
#endif
static ATCAIfaceCfg cfg_ateccx08a_i2c_pi;
#endif /* WOLFSSL_ATECC508A */
@ -390,8 +401,18 @@ int atmel_init(void)
}
}
/* Setup the hardware interface */
XMEMSET(&cfg_ateccx08a_i2c_pi, 0, sizeof(cfg_ateccx08a_i2c_pi));
cfg_ateccx08a_i2c_pi.iface_type = ATCA_I2C_IFACE;
cfg_ateccx08a_i2c_pi.devtype = ATECC_DEV_TYPE;
cfg_ateccx08a_i2c_pi.atcai2c.slave_address = ATECC_I2C_ADDR;
cfg_ateccx08a_i2c_pi.atcai2c.bus = ATECC_I2C_BUS;
cfg_ateccx08a_i2c_pi.atcai2c.baud = 400000;
cfg_ateccx08a_i2c_pi.wake_delay = 1500;
cfg_ateccx08a_i2c_pi.rx_retries = 20;
/* Initialize the CryptoAuthLib to communicate with ATECC508A */
status = atcab_init(&cfg_ateccx08a_i2c_default);
status = atcab_init(&cfg_ateccx08a_i2c_pi);
if (status != ATCA_SUCCESS) {
WOLFSSL_MSG("Failed to initialize atcab");
return WC_HW_E;

3
wolfssl/wolfcrypt/port/atmel/atmel.h
View File

@ -31,11 +31,10 @@
#undef SHA_BLOCK_SIZE
#define SHA_BLOCK_SIZE SHA_BLOCK_SIZE_REMAP
#include <cryptoauthlib.h>
#include <atcacert/atcacert_client.h>
#undef SHA_BLOCK_SIZE
#endif
/* ATECC508A only supports ECC-256 */
/* ATECC508A only supports ECC P-256 */
#define ATECC_KEY_SIZE (32)
#define ATECC_PUBKEY_SIZE (ATECC_KEY_SIZE*2) /* X and Y */
#define ATECC_SIG_SIZE (ATECC_KEY_SIZE*2) /* R and S */