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/* Copyright (c) 2017, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <gtest/gtest.h>
#include <openssl/rand.h>
#include <openssl/sha.h>
#include "internal.h"
#include "../../test/file_test.h"
#include "../../test/test_util.h"
TEST(CTRDRBGTest, Basic) {
const uint8_t kSeed[CTR_DRBG_ENTROPY_LEN] = {
0xe4, 0xbc, 0x23, 0xc5, 0x08, 0x9a, 0x19, 0xd8, 0x6f, 0x41, 0x19, 0xcb,
0x3f, 0xa0, 0x8c, 0x0a, 0x49, 0x91, 0xe0, 0xa1, 0xde, 0xf1, 0x7e, 0x10,
0x1e, 0x4c, 0x14, 0xd9, 0xc3, 0x23, 0x46, 0x0a, 0x7c, 0x2f, 0xb5, 0x8e,
0x0b, 0x08, 0x6c, 0x6c, 0x57, 0xb5, 0x5f, 0x56, 0xca, 0xe2, 0x5b, 0xad,
};
CTR_DRBG_STATE drbg;
ASSERT_TRUE(CTR_DRBG_init(&drbg, kSeed, nullptr, 0));
const uint8_t kReseed[CTR_DRBG_ENTROPY_LEN] = {
0xfd, 0x85, 0xa8, 0x36, 0xbb, 0xa8, 0x50, 0x19, 0x88, 0x1e, 0x8c, 0x6b,
0xad, 0x23, 0xc9, 0x06, 0x1a, 0xdc, 0x75, 0x47, 0x76, 0x59, 0xac, 0xae,
0xa8, 0xe4, 0xa0, 0x1d, 0xfe, 0x07, 0xa1, 0x83, 0x2d, 0xad, 0x1c, 0x13,
0x6f, 0x59, 0xd7, 0x0f, 0x86, 0x53, 0xa5, 0xdc, 0x11, 0x86, 0x63, 0xd6,
};
ASSERT_TRUE(CTR_DRBG_reseed(&drbg, kReseed, nullptr, 0));
uint8_t out[64];
ASSERT_TRUE(CTR_DRBG_generate(&drbg, out, sizeof(out), nullptr, 0));
ASSERT_TRUE(CTR_DRBG_generate(&drbg, out, sizeof(out), nullptr, 0));
const uint8_t kExpected[64] = {
0xb2, 0xcb, 0x89, 0x05, 0xc0, 0x5e, 0x59, 0x50, 0xca, 0x31, 0x89,
0x50, 0x96, 0xbe, 0x29, 0xea, 0x3d, 0x5a, 0x3b, 0x82, 0xb2, 0x69,
0x49, 0x55, 0x54, 0xeb, 0x80, 0xfe, 0x07, 0xde, 0x43, 0xe1, 0x93,
0xb9, 0xe7, 0xc3, 0xec, 0xe7, 0x3b, 0x80, 0xe0, 0x62, 0xb1, 0xc1,
0xf6, 0x82, 0x02, 0xfb, 0xb1, 0xc5, 0x2a, 0x04, 0x0e, 0xa2, 0x47,
0x88, 0x64, 0x29, 0x52, 0x82, 0x23, 0x4a, 0xaa, 0xda,
};
EXPECT_EQ(Bytes(kExpected), Bytes(out));
CTR_DRBG_clear(&drbg);
}
TEST(CTRDRBGTest, Large) {
const uint8_t kSeed[CTR_DRBG_ENTROPY_LEN] = {0};
CTR_DRBG_STATE drbg;
ASSERT_TRUE(CTR_DRBG_init(&drbg, kSeed, nullptr, 0));
std::unique_ptr<uint8_t[]> buf(new uint8_t[CTR_DRBG_MAX_GENERATE_LENGTH]);
ASSERT_TRUE(CTR_DRBG_generate(&drbg, buf.get(), CTR_DRBG_MAX_GENERATE_LENGTH,
nullptr, 0));
uint8_t digest[SHA256_DIGEST_LENGTH];
SHA256(buf.get(), CTR_DRBG_MAX_GENERATE_LENGTH, digest);
const uint8_t kExpected[SHA256_DIGEST_LENGTH] = {
0x69, 0x78, 0x15, 0x96, 0xca, 0xc0, 0x3f, 0x6a, 0x6d, 0xed, 0x22,
0x1e, 0x26, 0xd0, 0x75, 0x49, 0xa0, 0x4b, 0x91, 0x58, 0x3c, 0xf4,
0xe3, 0x6d, 0xff, 0x41, 0xbf, 0xb9, 0xf8, 0xa8, 0x1c, 0x2b,
};
EXPECT_EQ(Bytes(kExpected), Bytes(digest));
CTR_DRBG_clear(&drbg);
}
TEST(CTRDRBGTest, TestVectors) {
FileTestGTest("crypto/fipsmodule/rand/ctrdrbg_vectors.txt", [](FileTest *t) {
std::vector<uint8_t> seed, personalisation, reseed, ai_reseed, ai1, ai2,
expected;
ASSERT_TRUE(t->GetBytes(&seed, "EntropyInput"));
ASSERT_TRUE(t->GetBytes(&personalisation, "PersonalizationString"));
ASSERT_TRUE(t->GetBytes(&reseed, "EntropyInputReseed"));
ASSERT_TRUE(t->GetBytes(&ai_reseed, "AdditionalInputReseed"));
ASSERT_TRUE(t->GetBytes(&ai1, "AdditionalInput1"));
ASSERT_TRUE(t->GetBytes(&ai2, "AdditionalInput2"));
ASSERT_TRUE(t->GetBytes(&expected, "ReturnedBits"));
ASSERT_EQ(static_cast<size_t>(CTR_DRBG_ENTROPY_LEN), seed.size());
ASSERT_EQ(static_cast<size_t>(CTR_DRBG_ENTROPY_LEN), reseed.size());
CTR_DRBG_STATE drbg;
CTR_DRBG_init(&drbg, seed.data(),
personalisation.empty() ? nullptr : personalisation.data(),
personalisation.size());
CTR_DRBG_reseed(&drbg, reseed.data(),
ai_reseed.empty() ? nullptr : ai_reseed.data(),
ai_reseed.size());
std::vector<uint8_t> out;
out.resize(expected.size());
CTR_DRBG_generate(&drbg, out.data(), out.size(),
ai1.empty() ? nullptr : ai1.data(), ai1.size());
CTR_DRBG_generate(&drbg, out.data(), out.size(),
ai2.empty() ? nullptr : ai2.data(), ai2.size());
EXPECT_EQ(Bytes(expected), Bytes(out));
});
}
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