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@zhongdao 2017-11-04T09:10:50.000000Z 字数 5712 阅读 1459

代码验证

未分类

对4个字母的哈希验证merkle树.

注意: 不能把少于4个字节的整数传给函数.

php验证1

  1. <?php
  3. $a = hash('sha256', "a", true);
  4. $b = hash('sha256', "b", true);
  5. $c = hash('sha256', "c", true);
  6. $d = hash('sha256', "d", true);
  7. $e = hash('sha256', $a . $b, true);
  8. $f = hash('sha256', $c . $d, true);
  9. $g = hash('sha256', $e . $f);
  11. var_dump($g);
  1. $ php program.php                                                                                                                   
  2. string(64) "14ede5e8e97ad9372327728f5099b95604a39593cac3bd38a343ad76205213e7"

c验证1

  1. #define TFM_DESC
  3. #include "stdio.h"
  4. #include "stdlib.h"
  5. #include "string.h"
  6. #include "tfm.h"
  7. #include "tomcrypt.h"
  9. char *get_sha256(char *buffer, int size)
  10. {
  11.    hash_state resource;
  12.    char *digest;
  14.    digest = malloc(32);
  15.    sha256_init(&resource);
  16.    sha256_process(&resource, buffer, size);
  17.    sha256_done(&resource, digest);
  19.    return digest;
  20. }
  22. char *get_merkle_root(char *old, int size)
  23. {
  24.    char *new, output[32], input[64];
  25.    int index;
  27.    printf("activation (%d)%c", size, 10);
  29.    if (size == 1) {
  31.       new = malloc(32);
  32.       memcpy(new, old, 32);
  33.       free(old);
  35.       return new;
  36.    }
  38.    if (size % 2) {
  40.       new = malloc(32 * (size + 1));
  41.       memcpy(new, old, size * 32);
  42.       memcpy(new + size * 32, old + (size - 1) * 32, 32);
  43.       free(old);
  45.       return get_merkle_root(new, size + 1);
  46.    }
  48.    new = malloc(32 * size / 2);
  50.    for (index = 0; index < size; index += 2) {
  52.       memcpy(input, old + index * 32, 64);
  53.       memcpy(new + (index / 2) * 32, get_sha256(input, 64), 32);
  54.    }
  56.    free(old);
  58.    return get_merkle_root(new, size / 2);
  59. }
  61. void print_digest(char *digest)   // 用unsigned char* ?
  62. {
  63.    int index;
  65.    for (index = 0; index < 32; index++)
  66.       printf("%02hhx", digest[index]);  // 注意这里的hh !
  67.       // printf 默认打印 
  69.    printf("%c", 10);
  70. }
  72. void main()
  73. {
  74.    ltc_mp = tfm_desc;
  75.    register_prng(&sprng_desc);
  76.    register_hash(&sha256_desc);
  78.    char *collection, *digest;
  80.    collection = malloc(128);
  81.    memcpy(collection, get_sha256("a", 1), 32);
  82.    memcpy(collection + 32, get_sha256("b", 1), 32);
  83.    memcpy(collection + 64, get_sha256("c", 1), 32);
  84.    memcpy(collection + 96, get_sha256("d", 1), 32);
  86.    print_digest(get_merkle_root(collection, 4));
  87. }

$ tcc -c root.c -o root.o && tcc -o root.elf root.o ../libtomcrypt.a ../libtfm.a && ./root.elf
activation (4)
activation (2)
activation (1)
14ede5e8e97ad9372327728f5099b95604a39593cac3bd38a343ad76205213e7

注意点:

char与signed char, unsigned char的区别？
http://blog.csdn.net/sinat_20265495/article/details/51733015
char 与 unsigned char的本质区别
http://www.cnblogs.com/languoliang/archive/2013/03/15/char.html

C语言中 unsigned char 与 signed char 不同输出格式一些认识
http://blog.csdn.net/ssopp24/article/details/52838210

char, signed char 与 unsigned char 区别

  1. 1.ANSI C 提供了3种字符类型，分别是char、signed char、unsigned char。
  2. 2.三者都占1个字节
  3. 3.signed char取值范围是 -128 到 127(有符号位) ; unsigned char 取值范围是 0 到 255
  4. 4.内存中一串二进制，它的含义，就是这个类型来说明的。
  5. 5.所谓signed char 和 unsigned char 其实是相对“运算”而说的，已经脱离了我们字面含义“字符”，表示的范围有限。
  7. char 是 signed 还是 unsigned ?
  8. C标准中对char是 Impementation Defined，就是未明确定义
  9. （1）那它由什么定义？坦白说，具体的编译器明确定义，一般都是用signed char或unsigned char来实现char的，也就是说不同的编译器对char是什么定义不一样
  10. （2）为什么要这样定义？因为这三种类型的对象在存储介质中的表现形式是一样的（都是一个占8bit的01串，只是解析的时候不同）
  11. （3）到底是signed char还是unsigned char？这得看编译器：VC编译器、x86上的GCC都把char定义为signed char，而arm-linux-gcc却把char定义为 unsigned char

创造自己的区块和交易

2个区块与相应交易示例.

  1. #1: 3930
  2.    [8629] -> YUANXUN(100)
  4. #2: 4479
  5.    [4140] -> YUANXUN(100)
  6.    [7159] YUANXUN/8629/1 -> YUANXUN(99) PANPENG(1)

实现代码

初始设置

  1. /*
  2.    INITIAL = 33000000
  3.    RATE = (60 / PERIOD) * 24 * 365
  4.    SUPPLY(HEIGHT) = INITIAL * (1 + 0.04 / RATE) ^ HEIGHT
  5.    DEMURRAGE(HEIGHT) = SUPPLY(HEIGHT) - SUPPLY(HEIGHT - 1)
  7.       30 * 24 * 365 = 262,800.
  8.       16,000,000 * (1 + 0.4 / 262800)^262800.
  9. */
  1. /* 参数说明:  初始发行的币,  几分钟生成1个区块, ?  */
  2. uint64_t calculate_supply(uint64_t initial, uint32_t period, uint32_t height) {
  4.    double _0687, _8326, _3014;
  6.    _0687 = (double) initial;
  7.    _8326 = (60 * 24 * 365) / period;
  8.    _3014 = _0687 * pow(1 + 0.04 / _8326, height);
  10.    return ((uint64_t) _3014);
  11. }

因为ecc的签名算法,随机数的原因,输出签名的长度在69-71之间变化.
wc 的最后1列表示字节数.

  1. $ ./engine |wc                                                                                                                      
  2.       1      13     474
  3. $ ./engine |wc                                                                                                                      
  4.       2      15     473
  5. $ ./engine |wc                                                                                                                      
  6.       1      14     472
  7. $ ./engine |wc                                                                                                                      
  8.       2      14     473
  9. $ ./engine |wc                                                                                                                      
  10.       1      14     473
  1. $ xxd 1.block                                                                                                                       
  2. 0000000: bb7e 00b5 e58d 54c3 cd08 8333 596e dcbf  .~....T....3Yn..
  3. 0000010: 13f0 b820 fa92 345a 157d 065c 6fd6 266d  ... ..4Z.}.\o.&m
  4. 0000020: 0000 0000 0000 0000 0000 0000 0000 0000  ................
  5. 0000030: 0000 0000 0000 0000 0000 0000 0000 0000  ................
  6. 0000040: 0000 0000 ffff ffff ffff ffff ffff ffff  ................
  7. 0000050: ffff ffff ffff ffff ffff ffff ffff ffff  ................
  8. 0000060: ffff ffff bf7f fd59 0100 0000 5c00 0000  .......Y....\...
  9. 0000070: 0100 0000 0100 0000 3000 0000 0000 0000  ........0.......
  10. 0000080: 0000 0000 0000 0000 0000 0000 0000 0000  ................
  11. 0000090: 0000 0000 0000 0000 0000 0000 0000 0000  ................
  12. 00000a0: 0000 0000 0000 0000 2000 0000 1000 0000  ........ .......
  13. 00000b0: 7afd 3bd3 f876 930d be40 b59e 9ba8 6b31  z.;..v...@....k1
  14. 00000c0: 6400 0000 0000 0000                      d.......
  1. $ xxd 2.block                                                                                                                       
  2. 0000000: 58c1 5725 2eee cb38 94d0 e962 2976 87d3  X.W%...8...b)v..
  3. 0000010: 4ee0 8154 4b5e cc28 6e64 041d 89ec 8a7e  N..TK^.(nd.....~
  4. 0000020: 0000 0000 bdca ccd1 f766 4054 c719 9f36  .........f@T...6
  5. 0000030: 80d5 2309 1bd7 d911 7650 d681 dcc7 e131  ..#.....vP.....1
  6. 0000040: aeea 8a33 ffff ffff ffff ffff ffff ffff  ...3............
  7. 0000050: ffff ffff ffff ffff ffff ffff ffff ffff  ................
  8. 0000060: ffff ffff ce7f fd59 0200 0000 5c00 0000  .......Y....\...
  9. 0000070: 0100 0000 0100 0000 3000 0000 0000 0000  ........0.......
  10. 0000080: 0000 0000 0000 0000 0000 0000 0000 0000  ................
  11. 0000090: 0000 0000 0000 0000 0000 0000 0000 0000  ................
  12. 00000a0: 0000 0000 0000 0000 2000 0000 1000 0000  ........ .......
  13. 00000b0: 7afd 3bd3 f876 930d be40 b59e 9ba8 6b31  z.;..v...@....k1
  14. 00000c0: 6400 0000 0000 0000 1101 0000 0100 0000  d...............
  15. 00000d0: 0200 0000 c500 0000 0100 0000 4e00 0000  ............N...
  16. 00000e0: 304c 0302 0700 0201 2002 207f 5e56 4655  0L...... . .^VFU
  17. 00000f0: 10ab 820d 50a1 9a4b 5cfd b974 1c5f 13e9  ....P..K\..t._..
  18. 0000100: 79dc 672b 413f ab9c ec8c b502 2100 f8ce  y.g+A?......!...
  19. 0000110: 98b2 ca0a 465e ba4d fbf0 a950 08b5 c661  ....F^.M...P...a
  20. 0000120: cc77 6593 6962 ddb1 a8f4 d2e8 10bf 4700  .we.ib........G.
  21. 0000130: 0000 3045 0220 5e64 de30 5cd7 a2d5 107c  ..0E. ^d.0\....|
  22. 0000140: 67e9 e5a5 b5b7 4f48 8715 d85c a587 7c98  g.....OH...\..|.
  23. 0000150: 89ea 13b3 5863 0221 00a1 816a ffbd 9b35  ....Xc.!...j...5
  24. 0000160: b2cc e4d0 29ed 981b abd0 fe63 ee8b 63ff  ....)......c..c.
  25. 0000170: 47e0 8b10 8758 93f0 d7bb 7e00 b5e5 8d54  G....X....~....T
  26. 0000180: c3cd 0883 3359 6edc bf13 f0b8 20fa 9234  ....3Yn..... ..4
  27. 0000190: 5a15 7d06 5c6f d626 6d20 0000 0010 0000  Z.}.\o.&m ......
  28. 00001a0: 007a fd3b d3f8 7693 0dbe 40b5 9e9b a86b  .z.;..v...@....k
  29. 00001b0: 3163 0000 0000 0000 0020 0000 0010 0000  1c....... ......
  30. 00001c0: 0019 fda2 6e18 9d51 a452 6e1d 23cc ce56  ....n..Q.Rn.#..V
  31. 00001d0: 2401 0000 0000 0000 00                   $........
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