Cant get password hash via openssl in c same format as crypt, mkpasswd or openssl via cmdline

Question

I need to create a hashed password via the openssl lib in C. Unfortunately, I'm not able to get the expected result

This is the code I`m using:

unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256_CTX sha256;
SHA256_Init(&sha256);
SHA256_Update(&sha256, "xxx", 3);
SHA256_Update(&sha256, "11111111", 8);
SHA256_Final(hash, &sha256);

for(int i = 0; i < SHA256_DIGEST_LENGTH; i++)
{
    printf("%02x", hash[i]);
}

The output will be

57b2e9dd7f27e02ce026c1a40c7685b4658c2dff55e3a9de93186e545d1c4af1

but i expected

EDgBhRzUlXHcobBLtDfoWalyRFoSMnO1/q.s10aKSY7

since this is the output the crypt lib will produce as well as mkpasswd or openssl via shell.

See:

mkpasswd -m sha-256 --salt=11111111 xxx
$5$11111111$EDgBhRzUlXHcobBLtDfoWalyRFoSMnO1/q.s10aKSY7

or

openssl passwd -5 -salt 11111111 xxx
$5$11111111$EDgBhRzUlXHcobBLtDfoWalyRFoSMnO1/q.s10aKSY7

or

printf("%s\n", crypt("xxx", "$5$11111111"));
// also prints $5$11111111$EDgBhRzUlXHcobBLtDfoWalyRFoSMnO1/q.s10aKSY7

I need to get this working with the openssl lib. Am I completely wrong with creating the hash and salt, or is this just a dump formatting issue?

Answer 1

The algorithm is not just a simple SHA256 hash.

As reference the OpenSSL implementation can be found on github (shacrypt(...)).