c语言 sha256,C/C++知识点之密码学---hash函数（SHA-256）的C++实现
6 #include 7
8 using namespace std;
9
10 #define SHA256_ROTL(a,b) (((a>>(32-b))&(0x7fffffff>>(31-b)))|(a<
11 #define SHA256_SR(a,b) ((a>>b)&(0x7fffffff>>(b-1)))
12 #define SHA256_Ch(x,y,z) ((x&y)^((~x)&z))
13 #define SHA256_Maj(x,y,z) ((x&y)^(x&z)^(y&z))
14 #define SHA256_E0(x) (SHA256_ROTL(x,30)^SHA256_ROTL(x,19)^SHA256_ROTL(x,10))
15 #define SHA256_E1(x) (SHA256_ROTL(x,26)^SHA256_ROTL(x,21)^SHA256_ROTL(x,7))
16 #define SHA256_O0(x) (SHA256_ROTL(x,25)^SHA256_ROTL(x,14)^SHA256_SR(x,3))
17 #define SHA256_O1(x) (SHA256_ROTL(x,15)^SHA256_ROTL(x,13)^SHA256_SR(x,10))
18 char* StrSHA256(const char* str, long long length, char* sha256){
19 char *pp, *ppend;
20 long l, i, W[64], T1, T2, A, B, C, D, E, F, G, H, H0, H1, H2, H3, H4, H5, H6, H7;
21 H0 = 0x6a09e667, H1 = 0xbb67ae85, H2 = 0x3c6ef372, H3 = 0xa54ff53a;
22 H4 = 0x510e527f, H5 = 0x9b05688c, H6 = 0x1f83d9ab, H7 = 0x5be0cd19;
23 long K[64] = {
24 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
25 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
26 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
27 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
28 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
29 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
30 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
31 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
32 };
33 l = length + ((length % 64 > 56) ? (128 - length % 64) : (64 - length % 64));
34 if (!(pp = (char*)malloc((unsigned long)l))) return 0;
35 for (i = 0; i
36 for (pp[i + 3 - 2 * (i % 4)] = 128, i++; i
37 *((long*)(pp + l - 4)) = length <
38 *((long*)(pp + l - 8)) = length >> 29;
39 for (ppend = pp + l; pp
40 for (i = 0; i
41 for (i = 16; i
42 A = H0, B = H1, C = H2, D = H3, E = H4, F = H5, G = H6, H = H7;
43 for (i = 0; i
44 T1 = H + SHA256_E1(E) + SHA256_Ch(E, F, G) + K[i] + W[i];
45 T2 = SHA256_E0(A) + SHA256_Maj(A, B, C);
46 H = G, G = F, F = E, E = D + T1, D = C, C = B, B = A, A = T1 + T2;
47 }
48 H0 += A, H1 += B, H2 += C, H3 += D, H4 += E, H5 += F, H6 += G, H7 += H;
49 }
50 free(pp - l);
51 sprintf(sha256, "%08X%08X%08X%08X%08X%08X%08X%08X", H0, H1, H2, H3, H4, H5, H6, H7);
52 return sha256;
53 }
54 char* FileSHA256(const char* file, char* sha256){
55
56 FILE* fh;
57 char* addlp, T[64];
58 long addlsize, j, W[64], T1, T2, A, B, C, D, E, F, G, H, H0, H1, H2, H3, H4, H5, H6, H7;
59 long long length, i, cpys;
60 void *pp, *ppend;
61 H0 = 0x6a09e667, H1 = 0xbb67ae85, H2 = 0x3c6ef372, H3 = 0xa54ff53a;
62 H4 = 0x510e527f, H5 = 0x9b05688c, H6 = 0x1f83d9ab, H7 = 0x5be0cd19;
63 long K[64] = {
64 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
65 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
66 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
67 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
68 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
69 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
70 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
71 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
72 };
73 fh = fopen(file, "rb");
74 fseek(fh, 0, SEEK_END);
75 length = _ftelli64(fh);
76 addlsize = (56 - length % 64 > 0) ? (64) : (128);
77 if (!(addlp = (char*)malloc(addlsize))) return 0;
78 cpys = ((length - (56 - length % 64)) > 0) ? (length - length % 64) : (0);
79 j = (long)(length - cpys);
80 if (!(pp = (char*)malloc(j))) return 0;
81 fseek(fh, -j, SEEK_END);
82 fread(pp, 1, j, fh);
83 for (i = 0; i
84 free(pp);
85 for (addlp[i + 3 - 2 * (i % 4)] = 128, i++; i
86 *((long*)(addlp + addlsize - 4)) = length <
87 *((long*)(addlp + addlsize - 8)) = length >> 29;
88 for (rewind(fh); 64 == fread(W, 1, 64, fh);){
89 for (i = 0; i
90 for (i = 0; i
91 for (i = 16; i
92 A = H0, B = H1, C = H2, D = H3, E = H4, F = H5, G = H6, H = H7;
93 for (i = 0; i
94 T1 = H + SHA256_E1(E) + SHA256_Ch(E, F, G) + K[i] + W[i];
95 T2 = SHA256_E0(A) + SHA256_Maj(A, B, C);
96 H = G, G = F, F = E, E = D + T1, D = C, C = B, B = A, A = T1 + T2;
97 }
98 H0 += A, H1 += B, H2 += C, H3 += D, H4 += E, H5 += F, H6 += G, H7 += H;
99 }
100 for (pp = addlp, ppend = addlp + addlsize; pp
101 for (i = 0; i
102 for (i = 16; i
103 A = H0, B = H1, C = H2, D = H3, E = H4, F = H5, G = H6, H = H7;
104 for (i = 0; i
105 T1 = H + SHA256_E1(E) + SHA256_Ch(E, F, G) + K[i] + W[i];
106 T2 = SHA256_E0(A) + SHA256_Maj(A, B, C);
107 H = G, G = F, F = E, E = D + T1, D = C, C = B, B = A, A = T1 + T2;
108 }
109 H0 += A, H1 += B, H2 += C, H3 += D, H4 += E, H5 += F, H6 += G, H7 += H;
110 }
111 free(addlp); fclose(fh);
112 sprintf(sha256, "%08X%08X%08X%08X%08X%08X%08X%08X", H0, H1, H2, H3, H4, H5, H6, H7);
113 return sha256;
114 }
115
116 char* StrSHA256(const char* str, long long length, char* sha256);
117
118 int main(void){
119 char text[256];
120 cout<
121 while(cin>>text)
122 {
123 cout<
124 char sha256[256];
125 StrSHA256(text,sizeof(text)-1,sha256); // sizeof()包含了末尾的终止符‘\0‘故 -1
126 cout<
127 puts(sha256);
128
129 }
130
131 system("pause");
132 return 0;
133 }