Standalone test for OPENSSL_ia32_rdrand_bytes bug

rdrand_test.c

/*
 * Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

#include <stdio.h>
#include <openssl/rsa.h>

size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);

void dump() {
    unsigned char buf[7];

    OPENSSL_ia32_rdrand_bytes(buf, sizeof(buf));

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

    printf("\n");
}

int main() {
    for (int i = 0; i < 25; i++) {
        dump();
    }

    return 0;
}