#include
#include
#include
#include "sha256.h"
using namespace std;
function prototype, don't put your code here. Add it at the bottom
string merkle(vecto
string>);
int main() {
vecto
string> txns;
string str;
read stdin until it is empty
while(getline(cin, str)) txns.push_back(str);
output the Merkle root to the screen
cout
merkle(txns)
endl;
return 0;
}
string merkle(vecto
string> v1) {
vecto
string> v2;
string merkleRoot = "";
add your code here
return merkleRoot;
}
ifndef SHA256.docx
#ifndef SHA256_H
#define SHA256_H
#include
class SHA256
{
protected:
typedef unsigned char uint8;
typedef unsigned int uint32;
typedef unsigned long long uint64;
const static uint32 sha256_k[];
static const unsigned int SHA224_256_BLOCK_SIZE = (512/8);
public:
void init();
void update(const unsigned char *message, unsigned int len);
void final(unsigned char *digest);
static const unsigned int DIGEST_SIZE = ( 256 / 8);
protected:
void transform(const unsigned char *message, unsigned int block_nb);
unsigned int m_tot_len;
unsigned int m_len;
unsigned char m_block[2*SHA224_256_BLOCK_SIZE];
uint32 m_h[8];
};
std::string sha256(std::string input);
#define SHA2_SHFR(x, n) (x
n)
#define SHA2_ROTR(x, n) ((x
n) | (x
((sizeof(x)
3) - n)))
#define SHA2_ROTL(x, n) ((x
n) | (x
((sizeof(x)
3) - n)))
#define SHA2_CH(x, y, z) ((x & y) ^ (~x & z))
#define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
#define SHA256_F1(x) (SHA2_ROTR(x, 2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))
#define SHA256_F2(x) (SHA2_ROTR(x, 6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))
#define SHA256_F3(x) (SHA2_ROTR(x, 7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x, 3))
#define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))
#define SHA2_UNPACK32(x, str) \
{ \
*((str) + 3) = (uint8) ((x) ); \
*((str) + 2) = (uint8) ((x)
8); \
*((str) + 1) = (uint8) ((x)
16); \
*((str) + 0) = (uint8) ((x)
24); \
}
#define SHA2_PACK32(str, x) \
{ \
*(x) = ((uint32) *((str) + 3) ) \
| ((uint32) *((str) + 2)
8) \
| ((uint32) *((str) + 1)
16) \
| ((uint32) *((str) + 0)
24); \
}
#endif
include 1.docx
#include
#include
#include "sha256.h"
const unsigned int SHA256::sha256_k[64] =
UL = uint32
{0x428a2f98, 0x XXXXXXXXXX, 0xb5c0fbcf, 0xe9b5dba5,
XXXXXXXXXX0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
XXXXXXXXXX0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
XXXXXXXXXX0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
XXXXXXXXXX0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
XXXXXXXXXX0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
XXXXXXXXXX0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
XXXXXXXXXX0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x XXXXXXXXXX,
XXXXXXXXXX0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
XXXXXXXXXX0x650a7354, 0x766a0a
, 0x81c2c92e, 0x92722c85,
XXXXXXXXXX0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
XXXXXXXXXX0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
XXXXXXXXXX0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
XXXXXXXXXX0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
XXXXXXXXXX0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
XXXXXXXXXX0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
void SHA256::transform(const unsigned char *message, unsigned int block_nb)
{
uint32 w[64];
uint32 wv[8];
uint32 t1, t2;
const unsigned char *sub_block;
int i;
int j;
for (i = 0; i < (int) block_nb; i++) {
XXXXXXXXXXsub_block = message + (i
6);
XXXXXXXXXXfor (j = 0; j < 16; j++) {
XXXXXXXXXXSHA2_PACK32(&sub_block[j
2], &w[j]);
}
XXXXXXXXXXfor (j = 16; j < 64; j++) {
XXXXXXXXXXw[j] = SHA256_F4(w[j - 2]) + w[j - 7] + SHA256_F3(w[j - 15]) + w[j - 16];
}
XXXXXXXXXXfor (j = 0; j < 8; j++) {
XXXXXXXXXXwv[j] = m_h[j];
}
XXXXXXXXXXfor (j = 0; j < 64; j++) {
XXXXXXXXXXt1 = wv[7] + SHA256_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])
XXXXXXXXXXsha256_k[j] + w[j];
XXXXXXXXXXt2 = SHA256_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);
XXXXXXXXXXwv[7] = wv[6];
XXXXXXXXXXwv[6] = wv[5];
XXXXXXXXXXwv[5] = wv[4];
XXXXXXXXXXwv[4] = wv[3] + t1;
XXXXXXXXXXwv[3] = wv[2];
XXXXXXXXXXwv[2] = wv[1];
XXXXXXXXXXwv[1] = wv[0];
XXXXXXXXXXwv[0] = t1 + t2;
}
XXXXXXXXXXfor (j = 0; j < 8; j++) {
XXXXXXXXXXm_h[j] += wv[j];
}
}
}
void SHA256::init()
{
m_h[0] = 0x6a09e667;
m_h[1] = 0x
67ae85;
m_h[2] = 0x3c6ef372;
m_h[3] = 0xa54ff53a;
m_h[4] = 0x510e527f;
m_h[5] = 0x9b05688c;
m_h[6] = 0x1f83d9ab;
m_h[7] = 0x5be0cd19;
m_len = 0;
m_tot_len = 0;
}
void SHA256::update(const unsigned char *message, unsigned int len)
{
unsigned int block_nb;
unsigned int new_len, rem_len, tmp_len;
const unsigned char *shifted_message;
tmp_len = SHA224_256_BLOCK_SIZE - m_len;
rem_len = len < tmp_len ? len : tmp_len;
memcpy(&m_block[m_len], message, rem_len);
if (m_len + len < SHA224_256_BLOCK_SIZE) {
XXXXXXXXXXm_len += len;
XXXXXXXXXXreturn;
}
new_len = len - rem_len;
block_nb = new_len / SHA224_256_BLOCK_SIZE;
shifted_message = message + rem_len;
transform(m_block, 1);
transform(shifted_message, block_nb);
rem_len = new_len % SHA224_256_BLOCK_SIZE;
memcpy(m_block, &shifted_message[block_nb
6], rem_len);
m_len = rem_len;
m_tot_len += (block_nb + 1)
6;
}
void SHA256::final(unsigned char *digest)
{
unsigned int block_nb;
unsigned int pm_len;
unsigned int len_b;
int i;
block_nb = XXXXXXXXXXSHA224_256_BLOCK_SIZE - 9)
< (m_len % SHA224_256_BLOCK_SIZE)));
len_b = (m_tot_len + m_len)
3;
pm_len = block_nb
6;
memset(m_block + m_len, 0, pm_len - m_len);
m_block[m_len] = 0x80;
SHA2_UNPACK32(len_b, m_block + pm_len - 4);
transform(m_block, block_nb);
for (i = 0 ; i < 8; i++) {
XXXXXXXXXXSHA2_UNPACK32(m_h[i], &digest[i
2]);
}
}
std::string sha256(std::string input)
{
unsigned char digest[SHA256::DIGEST_SIZE];
memset(digest,0,SHA256::DIGEST_SIZE);
SHA256 ctx = SHA256();
ctx