printf("Digest is: ");
    for (unsigned int i=0; i<digest_len; ++i)
        printf("%02x", digest.get()[i]);
    printf("\n");

    cout << "Digest is: ";
    for (unsigned int i=0; i<digest_len; ++i)
        cout << hex << setw(2) << setfill('0') << digest.get()[i];
    cout << "\n";

===
Digest is: edeaaff3f1774ad2888673770c6d64097e391bc362d7d6fb34982ddf0efd18cb
Digest is: 0�0�0�0�0�0w0J0�0�0�0s0w0
                                    0m0d0       0~090�0b0�0�0�040�0-0�00�0▒0�