/* 
 * hash_tester.c
 * --------------
 * This program sends several commands to the coretest_hashes subsystem
 * in order to verify the SHA-1, SHA-256 and SHA-512/x hash function
 * cores.
 *
 * Note: This version of the program talks to the FPGA over an I2C bus.
 *
 * The single and dual block test cases are taken from the
 * NIST KAT document:
 * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/SHA_All.pdf
 *
 * 
 * Authors: Joachim Strömbergson, Paul Selkirk
 * Copyright (c) 2014, SUNET
 * 
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following 
 * conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in 
 *    the documentation and/or other materials provided with the 
 *    distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <ctype.h>

/* I2C configuration */
#define I2C_DEV  "/dev/i2c-2"

#define I2C_SHA1_ADDR    0x1e
#define I2C_SHA256_ADDR  0x1f
#define I2C_SHA512_ADDR  0x20

#define MODE_SHA_512_224 0x00
#define MODE_SHA_512_256 0x01
#define MODE_SHA_384     0x02
#define MODE_SHA_512     0x03

int i2cfd;
int debug = 0;

#define SHA1_BLOCK_BITS         512
#define SHA1_BLOCK_BYTES        SHA1_BLOCK_BITS/8
#define SHA1_DIGEST_BITS        160
#define SHA1_DIGEST_BYTES       SHA1_DIGEST_BITS/8

#define SHA256_BLOCK_BITS       512
#define SHA256_BLOCK_BYTES      SHA256_BLOCK_BITS/8
#define SHA256_DIGEST_BITS      256
#define SHA256_DIGEST_BYTES     SHA256_DIGEST_BITS/8

#define SHA512_BLOCK_BITS       1024
#define SHA512_BLOCK_BYTES      SHA512_BLOCK_BITS/8
#define SHA512_224_DIGEST_BITS  224
#define SHA512_224_DIGEST_BYTES SHA512_224_DIGEST_BITS/8
#define SHA512_256_DIGEST_BITS  256
#define SHA512_256_DIGEST_BYTES SHA512_256_DIGEST_BITS/8
#define SHA384_DIGEST_BITS      384
#define SHA384_DIGEST_BYTES     SHA384_DIGEST_BITS/8
#define SHA512_DIGEST_BITS      512
#define SHA512_DIGEST_BYTES     SHA512_DIGEST_BITS/8

/* SHA-1/SHA-256 One Block Message Sample
   Input Message: "abc" */
const uint8_t NIST_512_SINGLE[] =
{ 0x61, 0x62, 0x63, 0x80, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18 };

const uint8_t SHA1_SINGLE_DIGEST[] =
{ 0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81, 0x6a,
  0xba, 0x3e, 0x25, 0x71, 0x78, 0x50, 0xc2, 0x6c,
  0x9c, 0xd0, 0xd8, 0x9d };

const uint8_t SHA256_SINGLE_DIGEST[] =
{ 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA,
  0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23,
  0xB0, 0x03, 0x61, 0xA3, 0x96, 0x17, 0x7A, 0x9C,
  0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD };

/* SHA-1/SHA-256 Two Block Message Sample
   Input Message: "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" */
const uint8_t NIST_512_DOUBLE0[] =
{ 0x61, 0x62, 0x63, 0x64, 0x62, 0x63, 0x64, 0x65,
  0x63, 0x64, 0x65, 0x66, 0x64, 0x65, 0x66, 0x67,
  0x65, 0x66, 0x67, 0x68, 0x66, 0x67, 0x68, 0x69,
  0x67, 0x68, 0x69, 0x6A, 0x68, 0x69, 0x6A, 0x6B,
  0x69, 0x6A, 0x6B, 0x6C, 0x6A, 0x6B, 0x6C, 0x6D,
  0x6B, 0x6C, 0x6D, 0x6E, 0x6C, 0x6D, 0x6E, 0x6F,
  0x6D, 0x6E, 0x6F, 0x70, 0x6E, 0x6F, 0x70, 0x71,
  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
const uint8_t NIST_512_DOUBLE1[] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xC0 };

const uint8_t SHA1_DOUBLE_DIGEST[] =
{ 0x84, 0x98, 0x3E, 0x44, 0x1C, 0x3B, 0xD2, 0x6E,
  0xBA, 0xAE, 0x4A, 0xA1, 0xF9, 0x51, 0x29, 0xE5,
  0xE5, 0x46, 0x70, 0xF1 };

const uint8_t SHA256_DOUBLE_DIGEST[] =
{ 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8,
  0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39,
  0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67,
  0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 };

/* SHA-512 One Block Message Sample
   Input Message: "abc" */
const uint8_t NIST_1024_SINGLE[] =
{ 0x61, 0x62, 0x63, 0x80, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18 };

const uint8_t SHA512_224_SINGLE_DIGEST[] =
{ 0x46, 0x34, 0x27, 0x0f, 0x70, 0x7b, 0x6a, 0x54,
  0xda, 0xae, 0x75, 0x30, 0x46, 0x08, 0x42, 0xe2,
  0x0e, 0x37, 0xed, 0x26, 0x5c, 0xee, 0xe9, 0xa4,
  0x3e, 0x89, 0x24, 0xaa };
const uint8_t SHA512_256_SINGLE_DIGEST[] =
{ 0x53, 0x04, 0x8e, 0x26, 0x81, 0x94, 0x1e, 0xf9,
  0x9b, 0x2e, 0x29, 0xb7, 0x6b, 0x4c, 0x7d, 0xab,
  0xe4, 0xc2, 0xd0, 0xc6, 0x34, 0xfc, 0x6d, 0x46,
  0xe0, 0xe2, 0xf1, 0x31, 0x07, 0xe7, 0xaf, 0x23 };
const uint8_t SHA384_SINGLE_DIGEST[] =
{ 0xcb, 0x00, 0x75, 0x3f, 0x45, 0xa3, 0x5e, 0x8b,
  0xb5, 0xa0, 0x3d, 0x69, 0x9a, 0xc6, 0x50, 0x07,
  0x27, 0x2c, 0x32, 0xab, 0x0e, 0xde, 0xd1, 0x63,
  0x1a, 0x8b, 0x60, 0x5a, 0x43, 0xff, 0x5b, 0xed,
  0x80, 0x86, 0x07, 0x2b, 0xa1, 0xe7, 0xcc, 0x23,
  0x58, 0xba, 0xec, 0xa1, 0x34, 0xc8, 0x25, 0xa7 };
const uint8_t SHA512_SINGLE_DIGEST[] =
{ 0xdd, 0xaf, 0x35, 0xa1, 0x93, 0x61, 0x7a, 0xba,
  0xcc, 0x41, 0x73, 0x49, 0xae, 0x20, 0x41, 0x31,
  0x12, 0xe6, 0xfa, 0x4e, 0x89, 0xa9, 0x7e, 0xa2,
  0x0a, 0x9e, 0xee, 0xe6, 0x4b, 0x55, 0xd3, 0x9a,
  0x21, 0x92, 0x99, 0x2a, 0x27, 0x4f, 0xc1, 0xa8,
  0x36, 0xba, 0x3c, 0x23, 0xa3, 0xfe, 0xeb, 0xbd,
  0x45, 0x4d, 0x44, 0x23, 0x64, 0x3c, 0xe8, 0x0e,
  0x2a, 0x9a, 0xc9, 0x4f, 0xa5, 0x4c, 0xa4, 0x9f };

/* SHA-512 Two Block Message Sample
   Input Message: "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"
   "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu" */
const uint8_t NIST_1024_DOUBLE0[] =
{ 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
  0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
  0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
  0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b,
  0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c,
  0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d,
  0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
  0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
  0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
  0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71,
  0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72,
  0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73,
  0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74,
  0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75,
  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
const uint8_t NIST_1024_DOUBLE1[] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x80 };

const uint8_t SHA512_224_DOUBLE_DIGEST[] = 
{ 0x23, 0xfe, 0xc5, 0xbb, 0x94, 0xd6, 0x0b, 0x23,
  0x30, 0x81, 0x92, 0x64, 0x0b, 0x0c, 0x45, 0x33,
  0x35, 0xd6, 0x64, 0x73, 0x4f, 0xe4, 0x0e, 0x72,
  0x68, 0x67, 0x4a, 0xf9 };
const uint8_t SHA512_256_DOUBLE_DIGEST[] =
{ 0x39, 0x28, 0xe1, 0x84, 0xfb, 0x86, 0x90, 0xf8,
  0x40, 0xda, 0x39, 0x88, 0x12, 0x1d, 0x31, 0xbe,
  0x65, 0xcb, 0x9d, 0x3e, 0xf8, 0x3e, 0xe6, 0x14,
  0x6f, 0xea, 0xc8, 0x61, 0xe1, 0x9b, 0x56, 0x3a };
const uint8_t SHA384_DOUBLE_DIGEST[] =
{ 0x09, 0x33, 0x0c, 0x33, 0xf7, 0x11, 0x47, 0xe8,
  0x3d, 0x19, 0x2f, 0xc7, 0x82, 0xcd, 0x1b, 0x47,
  0x53, 0x11, 0x1b, 0x17, 0x3b, 0x3b, 0x05, 0xd2,
  0x2f, 0xa0, 0x80, 0x86, 0xe3, 0xb0, 0xf7, 0x12,
  0xfc, 0xc7, 0xc7, 0x1a, 0x55, 0x7e, 0x2d, 0xb9,
  0x66, 0xc3, 0xe9, 0xfa, 0x91, 0x74, 0x60, 0x39 };
const uint8_t SHA512_DOUBLE_DIGEST[] =
{ 0x8e, 0x95, 0x9b, 0x75, 0xda, 0xe3, 0x13, 0xda,
  0x8c, 0xf4, 0xf7, 0x28, 0x14, 0xfc, 0x14, 0x3f,
  0x8f, 0x77, 0x79, 0xc6, 0xeb, 0x9f, 0x7f, 0xa1,
  0x72, 0x99, 0xae, 0xad, 0xb6, 0x88, 0x90, 0x18,
  0x50, 0x1d, 0x28, 0x9e, 0x49, 0x00, 0xf7, 0xe4,
  0x33, 0x1b, 0x99, 0xde, 0xc4, 0xb5, 0x43, 0x3a,
  0xc7, 0xd3, 0x29, 0xee, 0xb6, 0xdd, 0x26, 0x54,
  0x5e, 0x96, 0xe5, 0x5b, 0x87, 0x4b, 0xe9, 0x09 };

/* ---------------- I2C low-level code ---------------- */

int i2c_open(char *dev)
{
    i2cfd = open(dev, O_RDWR);
    if (i2cfd < 0) {
        fprintf(stderr, "Unable to open %s: ", dev);
        perror("");
        i2cfd = 0;
        return 1;
    }

    return 0;
}

int i2c_addr(int addr)
{
    static int cur_addr = 0;

    if (addr != cur_addr) {
        if (ioctl(i2cfd, I2C_SLAVE, addr) < 0) {
            fprintf(stderr, "Unable to set I2C slave device 0x%02x: ", addr);
            perror("");
            return 1;
        }
        addr = cur_addr;
    }

    return 0;
}

int i2c_close(void)
{
    return close(i2cfd);
}

int i2c_write(const uint8_t *buf, int len)
{
    if (write(i2cfd, buf, len) != len) {
        perror("i2c write failed");
        return 1;
    }

    return 0;
}

int i2c_read(uint8_t *b)
{
    /* read() on the i2c device only returns one byte at a time,
     * and tc_get_resp() needs to parse the response one byte at a time
     */
    if (read(i2cfd, b, 1) != 1) {
        perror("i2c read failed");
        return 1;
    }

    return 0;
}

/* ---------------- test-case low-level code ---------------- */

int tc_write(int addr, const uint8_t *buf, int len)
{
    /* we only set the i2c device addr on tc_write, because test cases always
     * write before reading, plus test cases never call tc_read directly
     */
    if (i2c_addr(addr) != 0)
        return 1;

    if (debug) {
        int i;
        printf("write [");
        for (i = 0; i < len; ++i)
            printf(" %02x", buf[i]);
        printf(" ]\n");
    }

    return i2c_write(buf, len);
}

int tc_read(uint8_t *buf, int len)
{
    int i;

    if (debug) printf("read  [");

    for (i = 0; i < len; ++i) {
        if (i2c_read(&buf[i]) != 0) {
            if (debug) printf(" ]\n");
            return 1;
        }
        if (debug) printf(" %02x", buf[i]);
    }

    if (debug) printf(" ]\n");

    return 0;
}

int tc_expected(const uint8_t *expected, int len)
{
    uint8_t *buf;
    int i;

    buf = malloc(len);
    if (buf == NULL) {
        perror("malloc");
        return 1;
    }

    if (tc_read(buf, len) != 0)
        goto errout;

    for (i = 0; i < len; ++i)
        if (buf[i] != expected[i]) {
            fprintf(stderr, "response byte %d: expected 0x%02x, got 0x%02x\n",
                    i, expected[i], buf[i]);
            goto errout;
        }

    free(buf);
    return 0;
errout:
    free(buf);
    return 1;
}

/* ---------------- SHA-1 test cases ---------------- */

#define BLOCK_LEN  SHA1_BLOCK_BYTES
#define DIGEST_LEN SHA1_DIGEST_BYTES

/* TC1: Read name and version from SHA-1 core. */
int TC1(int addr)
{
    return 0;
}

/* TC2: SHA-1 Single block message test as specified by NIST. */
int TC2(int addr)
{
    const uint8_t *block = NIST_512_SINGLE;
    const uint8_t *expected = SHA1_SINGLE_DIGEST;

    printf("TC2: Single block message test for SHA-1.\n");

    if (addr == 0)
        addr = I2C_SHA1_ADDR;

    return
        tc_write(addr, block, BLOCK_LEN) ||
        tc_expected(expected, DIGEST_LEN);
}

/* TC3: SHA-1 Double block message test as specified by NIST. */
int TC3(int addr)
{
    const uint8_t *block[2] = { NIST_512_DOUBLE0, NIST_512_DOUBLE1 };
    const uint8_t *expected = SHA1_DOUBLE_DIGEST;

    printf("TC3: Double block message test for SHA-1.\n");

    if (addr == 0)
        addr = I2C_SHA1_ADDR;

    return
        tc_write(addr, block[0], BLOCK_LEN) ||
        tc_write(addr, block[1], BLOCK_LEN) ||
        tc_expected(expected, DIGEST_LEN);
}

/* ---------------- SHA-256 test cases ---------------- */

#undef  BLOCK_LEN
#define BLOCK_LEN  SHA256_BLOCK_BYTES
#undef  DIGEST_LEN
#define DIGEST_LEN SHA256_DIGEST_BYTES

int TC4(int addr)
{
    return 0;
}

/* TC5: SHA-256 Single block message test as specified by NIST. */
int TC5(int addr)
{
    const uint8_t *block = NIST_512_SINGLE;
    const uint8_t *expected = SHA256_SINGLE_DIGEST;

    printf("TC5: Single block message test for SHA-256.\n");

    if (addr == 0)
        addr = I2C_SHA256_ADDR;

    return
        tc_write(addr, block, BLOCK_LEN) ||
        tc_expected(expected, DIGEST_LEN);
}

/* TC6: SHA-256 Double block message test as specified by NIST. */
int TC6(int addr)
{
    const uint8_t *block[2] = { NIST_512_DOUBLE0, NIST_512_DOUBLE1 };
    const uint8_t *expected = SHA256_DOUBLE_DIGEST;

    printf("TC6: Double block message test for SHA-256.\n");

    if (addr == 0)
        addr = I2C_SHA256_ADDR;

    return
        tc_write(addr, block[0], BLOCK_LEN) ||
        tc_write(addr, block[1], BLOCK_LEN) ||
        tc_expected(expected, DIGEST_LEN);
}

/* TC7: SHA-256 Huge message test. */
int TC7(int addr)
{
    static const uint8_t block[] =
        { 0xaa, 0x55, 0xaa, 0x55, 0xde, 0xad, 0xbe, 0xef,
          0x55, 0xaa, 0x55, 0xaa, 0xf0, 0x0f, 0xf0, 0x0f,
          0xaa, 0x55, 0xaa, 0x55, 0xde, 0xad, 0xbe, 0xef,
          0x55, 0xaa, 0x55, 0xaa, 0xf0, 0x0f, 0xf0, 0x0f,
          0xaa, 0x55, 0xaa, 0x55, 0xde, 0xad, 0xbe, 0xef,
          0x55, 0xaa, 0x55, 0xaa, 0xf0, 0x0f, 0xf0, 0x0f,
          0xaa, 0x55, 0xaa, 0x55, 0xde, 0xad, 0xbe, 0xef,
          0x55, 0xaa, 0x55, 0xaa, 0xf0, 0x0f, 0xf0, 0x0f };

    /* final digest after 1000 iterations */
    static const uint8_t expected[] = 
        { 0x76, 0x38, 0xf3, 0xbc, 0x50, 0x0d, 0xd1, 0xa6,
          0x58, 0x6d, 0xd4, 0xd0, 0x1a, 0x15, 0x51, 0xaf,
          0xd8, 0x21, 0xd2, 0x35, 0x2f, 0x91, 0x9e, 0x28,
          0xd5, 0x84, 0x2f, 0xab, 0x03, 0xa4, 0x0f, 0x2a };

    int i, n = 1000;

    printf("TC7: Message with %d blocks test for SHA-256.\n", n);

    if (addr == 0)
        addr = I2C_SHA256_ADDR;

    /* Write blocks to SHA-256. */
    for (i = 0; i < n; ++i)
        if (tc_write(addr, block, BLOCK_LEN) != 0)
            return 1;

    /* Extract the final digest. */
    return tc_expected(expected, DIGEST_LEN);
}

/* ---------------- SHA-512 test cases ---------------- */

#undef  BLOCK_LEN
#define BLOCK_LEN  SHA512_BLOCK_BYTES

/* TC8: Read name and version from SHA-512 core. */
int TC8(int addr)
{
    return 0;
}

/* TC9: SHA-512 Single block message test as specified by NIST.
   We do this for all modes. */
int tc9(int addr, const uint8_t *expected, int digest_len)
{
    const uint8_t *block = NIST_1024_SINGLE;

    return
        tc_write(addr, block, BLOCK_LEN) ||
        tc_expected(expected, digest_len);
}

int TC9(int addr)
{
    if (addr == 0)
        addr = I2C_SHA512_ADDR;

    printf("TC9-1: Single block message test for SHA-512/224.\n");
    if (tc9(addr + MODE_SHA_512_224, SHA512_224_SINGLE_DIGEST,
            sizeof(SHA512_224_SINGLE_DIGEST)) != 0)
        return 1;

    printf("TC9-2: Single block message test for SHA-512/256.\n");
    if (tc9(addr + MODE_SHA_512_256, SHA512_256_SINGLE_DIGEST,
            sizeof(SHA512_256_SINGLE_DIGEST)) != 0)
        return 1;

    printf("TC9-3: Single block message test for SHA-384.\n");
    if (tc9(addr + MODE_SHA_384, SHA384_SINGLE_DIGEST,
            sizeof(SHA384_SINGLE_DIGEST)) != 0)
        return 1;

    printf("TC9-4: Single block message test for SHA-512.\n");
    if (tc9(addr + MODE_SHA_512, SHA512_SINGLE_DIGEST,
            sizeof(SHA512_SINGLE_DIGEST)) != 0)
        return 1;

    return 0;
}

/* TC10: SHA-512 Double block message test as specified by NIST.
   We do this for all modes. */
int tc10(int addr, const uint8_t *expected, int digest_len)
{
    const uint8_t *block[2] = { NIST_1024_DOUBLE0, NIST_1024_DOUBLE1 };

    return
        tc_write(addr, block[0], BLOCK_LEN) ||
        tc_write(addr, block[1], BLOCK_LEN) ||
        tc_expected(expected, digest_len);
}

int TC10(int addr)
{
    if (addr == 0)
        addr = I2C_SHA512_ADDR;

    printf("TC10-1: Double block message test for SHA-512/224.\n");
    if (tc10(addr + MODE_SHA_512_224, SHA512_224_DOUBLE_DIGEST,
             sizeof(SHA512_224_DOUBLE_DIGEST)) != 0)
        return 1;

    printf("TC10-2: Double block message test for SHA-512/256.\n");
    if (tc10(addr + MODE_SHA_512_256, SHA512_256_DOUBLE_DIGEST,
             sizeof(SHA512_256_DOUBLE_DIGEST)) != 0)
        return 1;

    printf("TC10-3: Double block message test for SHA-384.\n");
    if (tc10(addr + MODE_SHA_384, SHA384_DOUBLE_DIGEST,
             sizeof(SHA384_DOUBLE_DIGEST)) != 0)
        return 1;

    printf("TC10-4: Double block message test for SHA-512.\n");
    if (tc10(addr + MODE_SHA_512, SHA512_DOUBLE_DIGEST,
             sizeof(SHA512_DOUBLE_DIGEST)) != 0)
        return 1;

    return 0;
}

/* ---------------- main ---------------- */

int main(int argc, char *argv[])
{
    typedef int (*tcfp)(int);
    tcfp all_tests[] = { TC1, TC2, TC3, TC4, TC5, TC6, TC7, TC9, TC10
    };
    tcfp sha1_tests[] = { TC1, TC2, TC3 };
    tcfp sha256_tests[] = { TC4, TC5, TC6, TC7 };
    tcfp sha512_tests[] = { TC9, TC10 };

    char *usage = "Usage: %s [-h] [-d] [-i I2C_device] [-a I2C_addr] tc...\n";
    char *dev = I2C_DEV;
    int addr = 0;
    int i, j, opt;

    while ((opt = getopt(argc, argv, "h?di:a:")) != -1) {
        switch (opt) {
        case 'h':
        case '?':
            printf(usage, argv[0]);
            return 0;
        case 'd':
            debug = 1;
            break;
        case 'i':
            dev = optarg;
            break;
        case 'a':
            addr = (int)strtol(optarg, NULL, 0);
            if ((addr < 0x03) || (addr > 0x77)) {
                fprintf(stderr, "addr must be between 0x03 and 0x77\n");
                return 1;
            }
            break;
        default:
            fprintf(stderr, usage, argv[0]);
            return 1;
        }
    }

    if (i2c_open(dev) != 0)
        return 1;

    /* no args == run all tests */
    if (optind >= argc) {
        for (j = 0; j < sizeof(all_tests)/sizeof(all_tests[0]); ++j)
            if (all_tests[j](addr) != 0)
                return 1;
        return 0;
    }

    for (i = optind; i < argc; ++i) {
        if (strcmp(argv[i], "sha1") == 0) {
            for (j = 0; j < sizeof(sha1_tests)/sizeof(sha1_tests[0]); ++j)
                if (sha1_tests[j](addr) != 0)
                    return 1;
        }
        else if (strcmp(argv[i], "sha256") == 0) {
            for (j = 0; j < sizeof(sha256_tests)/sizeof(sha256_tests[0]); ++j)
                if (sha256_tests[j](addr) != 0)
                    return 1;
        }
        else if (strcmp(argv[i], "sha512") == 0) {
            for (j = 0; j < sizeof(sha512_tests)/sizeof(sha512_tests[0]); ++j)
                if (sha512_tests[j](addr) != 0)
                    return 1;
        }
        else if (strcmp(argv[i], "all") == 0) {
            for (j = 0; j < sizeof(all_tests)/sizeof(all_tests[0]); ++j)
                if (all_tests[j](addr) != 0)
                    return 1;
        }
        else if (isdigit(argv[i][0]) &&
                 (((j = atoi(argv[i])) > 0) &&
                  (j <= sizeof(all_tests)/sizeof(all_tests[0])))) {
            if (all_tests[j - 1](addr) != 0)
                return 1;
        }
        else {
            fprintf(stderr, "unknown test case %s\n", argv[i]);
            return 1;
        }
    }

    return 0;
}