49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// Copyright (c) 2020, Google Inc.
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// SPDX-License-Identifier: ISC
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#if !defined(_DEFAULT_SOURCE)
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#define _DEFAULT_SOURCE // Needed for getentropy on musl and glibc
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#endif
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#include <openssl/rand.h>
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#include "internal.h"
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#if defined(OPENSSL_RAND_CCRANDOMGENERATEBYTES)
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#include <gtest/gtest.h>
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#include <openssl/span.h>
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#include <CommonCrypto/CommonRandom.h>
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#include "../test/test_util.h"
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// This test is, strictly speaking, flaky, but we use large enough buffers
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// that the probability of failing when we should pass is negligible.
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TEST(CCRandomGenerateBytesTest, NotObviouslyBroken) {
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static const uint8_t kZeros[256] = {0};
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uint8_t buf1[256] = {0}, buf2[256] = {0}, buf3[256] = {0};
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EXPECT_EQ(CCRandomGenerateBytes(buf1, sizeof(buf1)), kCCSuccess);
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EXPECT_EQ(CCRandomGenerateBytes(buf2, sizeof(buf2)), kCCSuccess);
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EXPECT_NE(Bytes(buf1), Bytes(buf2));
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EXPECT_NE(Bytes(buf1), Bytes(kZeros));
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EXPECT_NE(Bytes(buf2), Bytes(kZeros));
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// Ensure that the implementation is not simply returning the memory unchanged.
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memcpy(buf3, buf1, sizeof(buf3));
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EXPECT_EQ(CCRandomGenerateBytes(buf1, sizeof(buf1)), kCCSuccess);
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EXPECT_NE(Bytes(buf1), Bytes(buf3));
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// |CCRandomGenerateBytes| supports bigger inputs.
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uint8_t buf4[1024] = {0}, buf5[1024] = {0};
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EXPECT_EQ(CCRandomGenerateBytes(buf4, sizeof(buf4)), kCCSuccess);
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EXPECT_EQ(CCRandomGenerateBytes(buf5, sizeof(buf5)), kCCSuccess);
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EXPECT_NE(Bytes(buf4), Bytes(buf5));
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}
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#endif // defined(OPENSSL_RAND_CCRANDOMGENERATEBYTES)
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