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