C sha256 sample code

#include <stdio.h>
#include <string.h>
#include <openssl/sha.h>

void encode(const unsigned char *input, char *output) {
    unsigned char hash[SHA256_DIGEST_LENGTH];
    SHA256_CTX sha256;
    SHA256_Init(&sha256);
    SHA256_Update(&sha256, input, strlen((char *)input));
    SHA256_Final(hash, &sha256);

    for(int i = 0; i < SHA256_DIGEST_LENGTH; i++) {
        sprintf(output + (i * 2), "%02x", hash[i]);
    }
    output[64] = 0;
}

int main() {
    const char *input = "1234567";
    char output[65];
    encode((unsigned char*)input, output);
    printf("Encoded: %s\n", output);
    return 0;
}