dsa_test.c

// gcc dsa_test.c -I/opt/local/include -L/opt/local/lib -lcrypto -o dsa_test && ./dsa_test
#include <openssl/dsa.h>

void checkBN(const char* what, const BIGNUM* bn, const char* should) {
    char *h = BN_bn2hex(bn);
    if (strcmp(h, should) != 0)
    {
        printf("FAILED: %s = %s instead of %s\n", what, h, should);
    }
    OPENSSL_free(h);
}

int main() {
    unsigned char seed[] = {
        0xd5, 0x01, 0x4e, 0x4b,
        0x60, 0xef, 0x2b, 0xa8,
        0xb6, 0x21, 0x1b, 0x40,
        0x62, 0xba, 0x32, 0x24,
        0xe0, 0x42, 0x7d, 0xd3
    };
    int counter_ret;
    unsigned long h_ret;
    DSA *r = DSA_generate_parameters(512, seed, 20, &counter_ret, &h_ret, NULL, NULL);
    if (counter_ret != 105)
    {
        printf("counter_ret = %d\n", counter_ret);
    }
    checkBN("p", DSA_get0_p(r), "8DF2A494492276AA3D25759BB06869CBEAC0D83AFB8D0CF7CBB8324F0D7882E5D0762FC5B7210EAFC2E9ADAC32AB7AAC49693DFBF83724C2EC0736EE31C80291");
    checkBN("q", DSA_get0_q(r), "C773218C737EC8EE993B4F2DED30F48EDACE915F");
    checkBN("g", DSA_get0_g(r), "626D027839EA0A13413163A55B4CB500299D5522956CEFCB3BFF10F399CE2C2E71CB9DE5FA24BABF58E5B79521925C9CC42E9F6F464B088CC572AF53E6D78802");
    DSA_free(r);
    return 0;
}