:-'Generic Commit'

dropshell-tool/openssl-1.1.1w/test/rdrand_sanitytest.c

@@ -0,0 +1,126 @@
+/*
+ * Copyright 2018-2019 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "testutil.h"
+#include <openssl/opensslconf.h>
+
+#if (defined(__i386)   || defined(__i386__)   || defined(_M_IX86) || \
+     defined(__x86_64) || defined(__x86_64__) || \
+     defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ)
+
+size_t OPENSSL_ia32_rdrand_bytes(unsigned char *buf, size_t len);
+size_t OPENSSL_ia32_rdseed_bytes(unsigned char *buf, size_t len);
+
+void OPENSSL_cpuid_setup(void);
+
+extern unsigned int OPENSSL_ia32cap_P[4];
+
+static int sanity_check_bytes(size_t (*rng)(unsigned char *, size_t),
+    int rounds, int min_failures, int max_retries, int max_zero_words)
+{
+    int testresult = 0;
+    unsigned char prior[31] = {0}, buf[31] = {0}, check[7];
+    int failures = 0, zero_words = 0;
+
+    int i;
+    for (i = 0; i < rounds; i++) {
+        size_t generated = 0;
+
+        int retry;
+        for (retry = 0; retry < max_retries; retry++) {
+            generated = rng(buf, sizeof(buf));
+            if (generated == sizeof(buf))
+                break;
+            failures++;
+        }
+
+        /*-
+         * Verify that we don't have too many unexpected runs of zeroes,
+         * implying that we might be accidentally using the 32-bit RDRAND
+         * instead of the 64-bit one on 64-bit systems.
+         */
+        size_t j;
+        for (j = 0; j < sizeof(buf) - 1; j++) {
+            if (buf[j] == 0 && buf[j+1] == 0) {
+                zero_words++;
+            }
+        }
+
+        if (!TEST_int_eq(generated, sizeof(buf)))
+            goto end;
+        if (!TEST_false(!memcmp(prior, buf, sizeof(buf))))
+            goto end;
+
+        /* Verify that the last 7 bytes of buf aren't all the same value */
+        unsigned char *tail = &buf[sizeof(buf) - sizeof(check)];
+        memset(check, tail[0], 7);
+        if (!TEST_false(!memcmp(check, tail, sizeof(check))))
+            goto end;
+
+        /* Save the result and make sure it's different next time */
+        memcpy(prior, buf, sizeof(buf));
+    }
+
+    if (!TEST_int_le(zero_words, max_zero_words))
+        goto end;
+
+    if (!TEST_int_ge(failures, min_failures))
+        goto end;
+
+    testresult = 1;
+end:
+    return testresult;
+}
+
+static int sanity_check_rdrand_bytes(void)
+{
+    return sanity_check_bytes(OPENSSL_ia32_rdrand_bytes, 1000, 0, 10, 10);
+}
+
+static int sanity_check_rdseed_bytes(void)
+{
+    /*-
+     * RDSEED may take many retries to succeed; note that this is effectively
+     * multiplied by the 8x retry loop in asm, and failure probabilities are
+     * increased by the fact that we need either 4 or 8 samples depending on
+     * the platform.
+     */
+    return sanity_check_bytes(OPENSSL_ia32_rdseed_bytes, 1000, 1, 10000, 10);
+}
+
+int setup_tests(void)
+{
+    OPENSSL_cpuid_setup();
+
+    int have_rdseed = (OPENSSL_ia32cap_P[2] & (1 << 18)) != 0;
+    int have_rdrand = (OPENSSL_ia32cap_P[1] & (1 << (62 - 32))) != 0;
+
+    if (have_rdrand) {
+        ADD_TEST(sanity_check_rdrand_bytes);
+    }
+
+    if (have_rdseed) {
+        ADD_TEST(sanity_check_rdseed_bytes);
+    }
+
+    return 1;
+}
+
+
+#else
+
+int setup_tests(void)
+{
+    return 1;
+}
+
+#endif