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SHA1 hash using Windows APIs
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| #include <Windows.h> | |
| #include <Wincrypt.h> | |
| #pragma comment(lib, "advapi32.lib") | |
| #define SHA1LEN 20 | |
| // generates SHA1 hash and returns 20-byte heap-memory if successful, otherwise NULL | |
| unsigned char* sha1(unsigned char* data, int len) | |
| { | |
| HCRYPTPROV hProv = 0; | |
| HCRYPTHASH hHash = 0; | |
| BYTE* sha1sum; | |
| DWORD sha1len = SHA1LEN; | |
| BOOL hashCalculated; | |
| if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) | |
| return NULL; | |
| if (!CryptCreateHash(hProv, CALG_SHA1, 0, 0, &hHash)) | |
| { | |
| CryptReleaseContext(hProv, 0); | |
| return NULL; | |
| } | |
| if (!CryptHashData(hHash, data, len, 0)) | |
| { | |
| CryptDestroyHash(hHash); | |
| CryptReleaseContext(hProv, 0); | |
| return NULL; | |
| } | |
| sha1sum = (BYTE*)malloc(SHA1LEN); | |
| hashCalculated = CryptGetHashParam(hHash, HP_HASHVAL, sha1sum, &sha1len, 0); | |
| CryptDestroyHash(hHash); | |
| CryptReleaseContext(hProv, 0); | |
| if (hashCalculated) | |
| return sha1sum; | |
| else | |
| { | |
| free(sha1sum); | |
| return NULL; | |
| } | |
| } | |
| int main() | |
| { | |
| char text[] = "abcd"; | |
| unsigned char* sha1sum = sha1((BYTE*)text, strlen(text)); | |
| // use the hash here | |
| // when you're done with the hash, free the memory | |
| free(sha1sum); | |
| return 0; | |
| } |
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