--- /dev/null
+/* ====================================================================
+ * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+#include <openssl/opensslconf.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <openssl/engine.h>
+
+#if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
+ defined(__x86_64) || defined(__x86_64__) || \
+ defined(_M_AMD64) || defined (_M_X64)) && !defined(OPENSSL_NO_ASM)
+
+size_t OPENSSL_ia32_rdrand(void);
+
+static int get_random_bytes (unsigned char *buf, size_t num)
+ {
+ size_t rnd;
+
+ while (num>=sizeof(size_t)) {
+ if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0;
+
+ *((size_t *)buf) = rnd;
+ buf += sizeof(size_t);
+ num -= sizeof(size_t);
+ }
+ if (num) {
+ if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0;
+
+ memcpy (buf,&rnd,num);
+ }
+
+ return 1;
+ }
+
+static int random_status (void)
+{ return 1; }
+
+static RAND_METHOD rdrand_meth =
+ {
+ NULL, /* seed */
+ get_random_bytes,
+ NULL, /* cleanup */
+ NULL, /* add */
+ get_random_bytes,
+ random_status,
+ };
+
+static int rdrand_init(ENGINE *e)
+{ return 1; }
+
+static const char *engine_e_rdrand_id = "rdrand";
+static const char *engine_e_rdrand_name = "Intel RDRAND engine";
+
+static int bind_helper(ENGINE *e)
+ {
+ if (!ENGINE_set_id(e, engine_e_rdrand_id) ||
+ !ENGINE_set_name(e, engine_e_rdrand_name) ||
+ !ENGINE_set_init_function(e, rdrand_init) ||
+ !ENGINE_set_RAND(e, &rdrand_meth) )
+ return 0;
+
+ return 1;
+ }
+
+static ENGINE *ENGINE_rdrand(void)
+ {
+ ENGINE *ret = ENGINE_new();
+ if(!ret)
+ return NULL;
+ if(!bind_helper(ret))
+ {
+ ENGINE_free(ret);
+ return NULL;
+ }
+ return ret;
+ }
+
+void ENGINE_load_rdrand (void)
+ {
+ extern OPENSSL_ia32cap_P[];
+
+ if (OPENSSL_ia32cap_P[1] & (1<<(62-32)))
+ {
+ ENGINE *toadd = ENGINE_rdrand();
+ if(!toadd) return;
+ ENGINE_add(toadd);
+ ENGINE_free(toadd);
+ ERR_clear_error();
+ }
+ }
+#else
+void ENGINE_load_rdrand (void) {}
+#endif
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