librash 0.1.0

Rust system library for cryptographic hashes
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

/* Copied from evp_digestinit(3) man page */

#include <stdio.h>
#include <string.h>

#ifdef NO_SHIM
#include <openssl/evp.h>
#else
#include "compat/evp.h"
#endif

int main(int argc, char *argv[]) {
    EVP_MD_CTX *mdctx;
    const EVP_MD *md;

    char mess1[] = "Test Message\n";
    char mess2[] = "Hello World\n";
    unsigned char md_value[EVP_MAX_MD_SIZE];
    unsigned int md_len, i;

    if(!argv[1]) {
           printf("Usage: mdtest digestname\n");
           exit(1);
    }

    md = EVP_get_digestbyname(argv[1]);

    if(!md) {
           printf("Unknown message digest %s\n", argv[1]);
           exit(1);
    }

    mdctx = EVP_MD_CTX_new();
    EVP_DigestInit_ex(mdctx, md, NULL);
    EVP_DigestUpdate(mdctx, mess1, strlen(mess1));
    EVP_DigestUpdate(mdctx, mess2, strlen(mess2));
    EVP_DigestFinal_ex(mdctx, md_value, &md_len);
    EVP_MD_CTX_free(mdctx);

    printf("Digest is: ");
    for(i = 0; i < md_len; i++)
        printf("%02x", md_value[i]);
    printf("\n");

    return 0;
}