/* Copyright (c) 2014, Google Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#include <stdio.h>
#include <stdlib.h>

#include <openssl/bytestring.h>


static int test_skip(void) {
  static const uint8_t kData[] = {1, 2, 3};
  CBS data;

  CBS_init(&data, kData, sizeof(kData));
  return CBS_len(&data) == 3 &&
      CBS_skip(&data, 1) &&
      CBS_len(&data) == 2 &&
      CBS_skip(&data, 2) &&
      CBS_len(&data) == 0 &&
      !CBS_skip(&data, 1);
}

static int test_get_u(void) {
  static const uint8_t kData[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  uint8_t u8;
  uint16_t u16;
  uint32_t u32;
  CBS data;

  CBS_init(&data, kData, sizeof(kData));
  return CBS_get_u8(&data, &u8) &&
    u8 == 1 &&
    CBS_get_u16(&data, &u16) &&
    u16 == 0x203 &&
    CBS_get_u24(&data, &u32) &&
    u32 == 0x40506 &&
    CBS_get_u32(&data, &u32) &&
    u32 == 0x708090a &&
    !CBS_get_u8(&data, &u8);
}

static int test_get_prefixed(void) {
  static const uint8_t kData[] = {1, 2, 0, 2, 3, 4, 0, 0, 3, 3, 2, 1};
  uint8_t u8;
  uint16_t u16;
  uint32_t u32;
  CBS data, prefixed;

  CBS_init(&data, kData, sizeof(kData));
  return CBS_get_u8_length_prefixed(&data, &prefixed) &&
    CBS_len(&prefixed) == 1 &&
    CBS_get_u8(&prefixed, &u8) &&
    u8 == 2 &&
    CBS_get_u16_length_prefixed(&data, &prefixed) &&
    CBS_len(&prefixed) == 2 &&
    CBS_get_u16(&prefixed, &u16) &&
    u16 == 0x304 &&
    CBS_get_u24_length_prefixed(&data, &prefixed) &&
    CBS_len(&prefixed) == 3 &&
    CBS_get_u24(&prefixed, &u32) &&
    u32 == 0x30201;
}

static int test_get_prefixed_bad(void) {
  static const uint8_t kData1[] = {2, 1};
  static const uint8_t kData2[] = {0, 2, 1};
  static const uint8_t kData3[] = {0, 0, 2, 1};
  CBS data, prefixed;

  CBS_init(&data, kData1, sizeof(kData1));
  if (CBS_get_u8_length_prefixed(&data, &prefixed)) {
    return 0;
  }

  CBS_init(&data, kData2, sizeof(kData2));
  if (CBS_get_u16_length_prefixed(&data, &prefixed)) {
    return 0;
  }

  CBS_init(&data, kData3, sizeof(kData3));
  if (CBS_get_u24_length_prefixed(&data, &prefixed)) {
    return 0;
  }

  return 1;
}

static int test_get_asn1(void) {
  static const uint8_t kData1[] = {0x30, 2, 1, 2};
  static const uint8_t kData2[] = {0x30, 3, 1, 2};
  static const uint8_t kData3[] = {0x30, 0x80};
  static const uint8_t kData4[] = {0x30, 0x81, 1, 1};
  static const uint8_t kData5[] = {0x30, 0x82, 0, 1, 1};

  CBS data, contents;

  CBS_init(&data, kData1, sizeof(kData1));
  if (!CBS_get_asn1(&data, &contents, 0x30) ||
      CBS_len(&contents) != 2 ||
      memcmp(CBS_data(&contents), "\x01\x02", 2) != 0) {
    return 0;
  }

  CBS_init(&data, kData2, sizeof(kData2));
  /* data is truncated */
  if (CBS_get_asn1(&data, &contents, 0x30)) {
    return 0;
  }

  CBS_init(&data, kData3, sizeof(kData3));
  /* zero byte length of length */
  if (CBS_get_asn1(&data, &contents, 0x30)) {
    return 0;
  }

  CBS_init(&data, kData4, sizeof(kData4));
  /* long form mistakenly used. */
  if (CBS_get_asn1(&data, &contents, 0x30)) {
    return 0;
  }

  CBS_init(&data, kData5, sizeof(kData5));
  /* length takes too many bytes. */
  if (CBS_get_asn1(&data, &contents, 0x30)) {
    return 0;
  }

  CBS_init(&data, kData1, sizeof(kData1));
  /* wrong tag. */
  if (CBS_get_asn1(&data, &contents, 0x31)) {
    return 0;
  }

  return 1;
}

static int test_get_indef(void) {
  static const uint8_t kData1[] = {0x30, 0x80, 0x00, 0x00};
  static const uint8_t kDataWithoutEOC[] = {0x30, 0x80, 0x01, 0x00};
  static const uint8_t kDataWithBadInternalLength[] = {0x30, 0x80, 0x01, 0x01};
  static const uint8_t kDataNested[] = {0x30, 0x80, 0x30, 0x80, 0x30, 0x80,
                                        0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  static const uint8_t kDataPrimitive[] = {0x02, 0x80, 0x00, 0x00};

  CBS data, contents;
  CBS_init(&data, kData1, sizeof(kData1));
  if (CBS_get_asn1(&data, &contents, 0x30)) {
    /* Indefinite lengths should not be supported in DER mode. */
    fprintf(stderr, "Indefinite length parsed by CBS_get_asn1.\n");
    return 0;
  }

  if (!CBS_get_asn1_ber(&data, &contents, 0x30) ||
      CBS_len(&contents) != 0 ||
      CBS_len(&data) != 0) {
    fprintf(stderr, "Simple indefinite length failed.\n");
    return 0;
  }

  CBS_init(&data, kDataWithoutEOC, sizeof(kDataWithoutEOC));
  if (CBS_get_asn1_ber(&data, &contents, 0x30)) {
    fprintf(stderr, "Parsed without EOC.\n");
    return 0;
  }

  CBS_init(&data, kDataWithBadInternalLength,
           sizeof(kDataWithBadInternalLength));
  if (CBS_get_asn1_ber(&data, &contents, 0x30)) {
    fprintf(stderr, "Parsed with internal length.\n");
    return 0;
  }

  CBS_init(&data, kDataNested, sizeof(kDataNested));
  if (!CBS_get_asn1_ber(&data, &contents, 0x30) ||
      CBS_len(&contents) != 8 ||
      CBS_len(&data) != 0) {
    fprintf(stderr, "Nested indefinite lengths failed.\n");
    return 0;
  }

  CBS_init(&data, kDataPrimitive, sizeof(kDataPrimitive));
  if (CBS_get_asn1_ber(&data, &contents, 0x02)) {
    /* Indefinite lengths should not be supported for non-constructed
     * elements. */
    fprintf(stderr, "Parsed non-constructed element with indefinite length\n");
    return 0;
  }

  return 1;
}

static int test_cbb_basic(void) {
  static const uint8_t kExpected[] = {1, 2, 3, 4, 5, 6, 7, 8};
  uint8_t *buf;
  size_t buf_len;
  int ok;
  CBB cbb;

  if (!CBB_init(&cbb, 100)) {
    return 0;
  }
  CBB_cleanup(&cbb);

  if (!CBB_init(&cbb, 0) ||
      !CBB_add_u8(&cbb, 1) ||
      !CBB_add_u16(&cbb, 0x203) ||
      !CBB_add_u24(&cbb, 0x40506) ||
      !CBB_add_bytes(&cbb, (const uint8_t*) "\x07\x08", 2) ||
      !CBB_finish(&cbb, &buf, &buf_len)) {
    return 0;
  }

  ok = buf_len == sizeof(kExpected) && memcmp(buf, kExpected, buf_len) == 0;
  free(buf);
  return ok;
}

static int test_cbb_fixed(void) {
  CBB cbb;
  uint8_t buf[1];
  uint8_t *out_buf;
  size_t out_size;

  if (!CBB_init_fixed(&cbb, NULL, 0) ||
      CBB_add_u8(&cbb, 1) ||
      !CBB_finish(&cbb, &out_buf, &out_size) ||
      out_buf != NULL ||
      out_size != 0) {
    return 0;
  }

  if (!CBB_init_fixed(&cbb, buf, 1) ||
      !CBB_add_u8(&cbb, 1) ||
      CBB_add_u8(&cbb, 2) ||
      !CBB_finish(&cbb, &out_buf, &out_size) ||
      out_buf != buf ||
      out_size != 1 ||
      buf[0] != 1) {
    return 0;
  }

  return 1;
}

static int test_cbb_finish_child(void) {
  CBB cbb, child;
  uint8_t *out_buf;
  size_t out_size;

  if (!CBB_init(&cbb, 16) ||
      !CBB_add_u8_length_prefixed(&cbb, &child) ||
      CBB_finish(&child, &out_buf, &out_size) ||
      !CBB_finish(&cbb, &out_buf, &out_size) ||
      out_size != 1 ||
      out_buf[0] != 0) {
    return 0;
  }

  free(out_buf);
  return 1;
}

static int test_cbb_prefixed(void) {
  static const uint8_t kExpected[] = {0, 1, 1, 0, 2, 2, 3, 0, 0, 3,
                                      4, 5, 6, 5, 4, 1, 0, 1, 2};
  uint8_t *buf;
  size_t buf_len;
  CBB cbb, contents, inner_contents, inner_inner_contents;
  int ok;

  if (!CBB_init(&cbb, 0) ||
      !CBB_add_u8_length_prefixed(&cbb, &contents) ||
      !CBB_add_u8_length_prefixed(&cbb, &contents) ||
      !CBB_add_u8(&contents, 1) ||
      !CBB_add_u16_length_prefixed(&cbb, &contents) ||
      !CBB_add_u16(&contents, 0x203) ||
      !CBB_add_u24_length_prefixed(&cbb, &contents) ||
      !CBB_add_u24(&contents, 0x40506) ||
      !CBB_add_u8_length_prefixed(&cbb, &contents) ||
      !CBB_add_u8_length_prefixed(&contents, &inner_contents) ||
      !CBB_add_u8(&inner_contents, 1) ||
      !CBB_add_u16_length_prefixed(&inner_contents, &inner_inner_contents) ||
      !CBB_add_u8(&inner_inner_contents, 2) ||
      !CBB_finish(&cbb, &buf, &buf_len)) {
    return 0;
  }

  ok = buf_len == sizeof(kExpected) && memcmp(buf, kExpected, buf_len) == 0;
  free(buf);
  return ok;
}

static int test_cbb_misuse(void) {
  CBB cbb, child, contents;
  uint8_t *buf;
  size_t buf_len;

  if (!CBB_init(&cbb, 0) ||
      !CBB_add_u8_length_prefixed(&cbb, &child) ||
      !CBB_add_u8(&child, 1) ||
      !CBB_add_u8(&cbb, 2)) {
    return 0;
  }

  /* Since we wrote to |cbb|, |child| is now invalid and attempts to write to
   * it should fail. */
  if (CBB_add_u8(&child, 1) ||
      CBB_add_u16(&child, 1) ||
      CBB_add_u24(&child, 1) ||
      CBB_add_u8_length_prefixed(&child, &contents) ||
      CBB_add_u16_length_prefixed(&child, &contents) ||
      CBB_add_asn1(&child, &contents, 1) ||
      CBB_add_bytes(&child, (const uint8_t*) "a", 1)) {
    fprintf(stderr, "CBB operation on invalid CBB did not fail.\n");
    return 0;
  }

  if (!CBB_finish(&cbb, &buf, &buf_len) ||
      buf_len != 3 ||
      memcmp(buf, "\x01\x01\x02", 3) != 0) {
    return 0;
  }

  free(buf);

  return 1;
}

static int test_cbb_asn1(void) {
  static const uint8_t kExpected[] = {0x30, 3, 1, 2, 3};
  uint8_t *buf, *test_data;
  size_t buf_len;
  CBB cbb, contents, inner_contents;

  if (!CBB_init(&cbb, 0) ||
      !CBB_add_asn1(&cbb, &contents, 0x30) ||
      !CBB_add_bytes(&contents, (const uint8_t*) "\x01\x02\x03", 3) ||
      !CBB_finish(&cbb, &buf, &buf_len)) {
    return 0;
  }

  if (buf_len != sizeof(kExpected) || memcmp(buf, kExpected, buf_len) != 0) {
    return 0;
  }
  free(buf);

  test_data = malloc(100000);
  memset(test_data, 0x42, 100000);

  if (!CBB_init(&cbb, 0) ||
      !CBB_add_asn1(&cbb, &contents, 0x30) ||
      !CBB_add_bytes(&contents, test_data, 130) ||
      !CBB_finish(&cbb, &buf, &buf_len)) {
    return 0;
  }

  if (buf_len != 3 + 130 ||
      memcmp(buf, "\x30\x81\x82", 3) != 0 ||
      memcmp(buf + 3, test_data, 130) != 0) {
    return 0;
  }
  free(buf);

  if (!CBB_init(&cbb, 0) ||
      !CBB_add_asn1(&cbb, &contents, 0x30) ||
      !CBB_add_bytes(&contents, test_data, 1000) ||
      !CBB_finish(&cbb, &buf, &buf_len)) {
    return 0;
  }

  if (buf_len != 4 + 1000 ||
      memcmp(buf, "\x30\x82\x03\xe8", 4) != 0 ||
      memcmp(buf + 4, test_data, 1000)) {
    return 0;
  }
  free(buf);

  if (!CBB_init(&cbb, 0) ||
      !CBB_add_asn1(&cbb, &contents, 0x30) ||
      !CBB_add_asn1(&contents, &inner_contents, 0x30) ||
      !CBB_add_bytes(&inner_contents, test_data, 100000) ||
      !CBB_finish(&cbb, &buf, &buf_len)) {
    return 0;
  }

  if (buf_len != 5 + 5 + 100000 ||
      memcmp(buf, "\x30\x83\x01\x86\xa5\x30\x83\x01\x86\xa0", 10) != 0 ||
      memcmp(buf + 10, test_data, 100000)) {
    return 0;
  }
  free(buf);

  free(test_data);
  return 1;
}

int main(void) {
  if (!test_skip() ||
      !test_get_u() ||
      !test_get_prefixed() ||
      !test_get_prefixed_bad() ||
      !test_get_asn1() ||
      !test_get_indef() ||
      !test_cbb_basic() ||
      !test_cbb_fixed() ||
      !test_cbb_finish_child() ||
      !test_cbb_misuse() ||
      !test_cbb_prefixed() ||
      !test_cbb_asn1()) {
    return 1;
  }

  printf("PASS\n");
  return 0;
}