Robert Sloan | 8ff0355 | 2017-06-14 12:40:58 -0700 | [diff] [blame^] | 1 | /* Copyright (c) 2014, Google Inc. |
| 2 | * |
| 3 | * Permission to use, copy, modify, and/or distribute this software for any |
| 4 | * purpose with or without fee is hereby granted, provided that the above |
| 5 | * copyright notice and this permission notice appear in all copies. |
| 6 | * |
| 7 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 8 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 9 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 10 | * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 11 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| 12 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 13 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ |
| 14 | |
| 15 | #include <stdint.h> |
| 16 | #include <string.h> |
| 17 | |
| 18 | #include <vector> |
| 19 | |
| 20 | #include <gtest/gtest.h> |
| 21 | |
| 22 | #include <openssl/aead.h> |
| 23 | #include <openssl/cipher.h> |
| 24 | #include <openssl/err.h> |
| 25 | |
| 26 | #include "../internal.h" |
| 27 | #include "../test/file_test.h" |
| 28 | #include "../test/test_util.h" |
| 29 | |
| 30 | |
| 31 | struct KnownAEAD { |
| 32 | const char name[40]; |
| 33 | const EVP_AEAD *(*func)(void); |
| 34 | const char *test_vectors; |
| 35 | // limited_implementation indicates that tests that assume a generic AEAD |
| 36 | // interface should not be performed. For example, the key-wrap AEADs only |
| 37 | // handle inputs that are a multiple of eight bytes in length and the |
| 38 | // SSLv3/TLS AEADs have the concept of “direction”. |
| 39 | bool limited_implementation; |
| 40 | // truncated_tags is true if the AEAD supports truncating tags to arbitrary |
| 41 | // lengths. |
| 42 | bool truncated_tags; |
| 43 | // ad_len, if non-zero, is the required length of the AD. |
| 44 | size_t ad_len; |
| 45 | }; |
| 46 | |
| 47 | static const struct KnownAEAD kAEADs[] = { |
| 48 | {"AES_128_GCM", EVP_aead_aes_128_gcm, "aes_128_gcm_tests.txt", false, true, |
| 49 | 0}, |
| 50 | {"AES_128_GCM_NIST", EVP_aead_aes_128_gcm, "nist_cavp/aes_128_gcm.txt", |
| 51 | false, true, 0}, |
| 52 | {"AES_256_GCM", EVP_aead_aes_256_gcm, "aes_256_gcm_tests.txt", false, true, |
| 53 | 0}, |
| 54 | {"AES_256_GCM_NIST", EVP_aead_aes_256_gcm, "nist_cavp/aes_256_gcm.txt", |
| 55 | false, true, 0}, |
| 56 | #if !defined(OPENSSL_SMALL) |
| 57 | {"AES_128_GCM_SIV", EVP_aead_aes_128_gcm_siv, "aes_128_gcm_siv_tests.txt", |
| 58 | false, false, 0}, |
| 59 | {"AES_256_GCM_SIV", EVP_aead_aes_256_gcm_siv, "aes_256_gcm_siv_tests.txt", |
| 60 | false, false, 0}, |
| 61 | #endif |
| 62 | {"ChaCha20Poly1305", EVP_aead_chacha20_poly1305, |
| 63 | "chacha20_poly1305_tests.txt", false, true, 0}, |
| 64 | {"AES_128_CBC_SHA1_TLS", EVP_aead_aes_128_cbc_sha1_tls, |
| 65 | "aes_128_cbc_sha1_tls_tests.txt", true, false, 11}, |
| 66 | {"AES_128_CBC_SHA1_TLSImplicitIV", |
| 67 | EVP_aead_aes_128_cbc_sha1_tls_implicit_iv, |
| 68 | "aes_128_cbc_sha1_tls_implicit_iv_tests.txt", true, false, 11}, |
| 69 | {"AES_128_CBC_SHA256_TLS", EVP_aead_aes_128_cbc_sha256_tls, |
| 70 | "aes_128_cbc_sha256_tls_tests.txt", true, false, 11}, |
| 71 | {"AES_256_CBC_SHA1_TLS", EVP_aead_aes_256_cbc_sha1_tls, |
| 72 | "aes_256_cbc_sha1_tls_tests.txt", true, false, 11}, |
| 73 | {"AES_256_CBC_SHA1_TLSImplicitIV", |
| 74 | EVP_aead_aes_256_cbc_sha1_tls_implicit_iv, |
| 75 | "aes_256_cbc_sha1_tls_implicit_iv_tests.txt", true, false, 11}, |
| 76 | {"AES_256_CBC_SHA256_TLS", EVP_aead_aes_256_cbc_sha256_tls, |
| 77 | "aes_256_cbc_sha256_tls_tests.txt", true, false, 11}, |
| 78 | {"AES_256_CBC_SHA384_TLS", EVP_aead_aes_256_cbc_sha384_tls, |
| 79 | "aes_256_cbc_sha384_tls_tests.txt", true, false, 11}, |
| 80 | {"DES_EDE3_CBC_SHA1_TLS", EVP_aead_des_ede3_cbc_sha1_tls, |
| 81 | "des_ede3_cbc_sha1_tls_tests.txt", true, false, 11}, |
| 82 | {"DES_EDE3_CBC_SHA1_TLSImplicitIV", |
| 83 | EVP_aead_des_ede3_cbc_sha1_tls_implicit_iv, |
| 84 | "des_ede3_cbc_sha1_tls_implicit_iv_tests.txt", true, false, 11}, |
| 85 | {"AES_128_CBC_SHA1_SSL3", EVP_aead_aes_128_cbc_sha1_ssl3, |
| 86 | "aes_128_cbc_sha1_ssl3_tests.txt", true, false, 9}, |
| 87 | {"AES_256_CBC_SHA1_SSL3", EVP_aead_aes_256_cbc_sha1_ssl3, |
| 88 | "aes_256_cbc_sha1_ssl3_tests.txt", true, false, 9}, |
| 89 | {"DES_EDE3_CBC_SHA1_SSL3", EVP_aead_des_ede3_cbc_sha1_ssl3, |
| 90 | "des_ede3_cbc_sha1_ssl3_tests.txt", true, false, 9}, |
| 91 | {"AES_128_CTR_HMAC_SHA256", EVP_aead_aes_128_ctr_hmac_sha256, |
| 92 | "aes_128_ctr_hmac_sha256.txt", false, true, 0}, |
| 93 | {"AES_256_CTR_HMAC_SHA256", EVP_aead_aes_256_ctr_hmac_sha256, |
| 94 | "aes_256_ctr_hmac_sha256.txt", false, true, 0}, |
| 95 | }; |
| 96 | |
| 97 | class PerAEADTest : public testing::TestWithParam<KnownAEAD> { |
| 98 | public: |
| 99 | const EVP_AEAD *aead() { return GetParam().func(); } |
| 100 | }; |
| 101 | |
| 102 | INSTANTIATE_TEST_CASE_P(, PerAEADTest, testing::ValuesIn(kAEADs), |
| 103 | [](const testing::TestParamInfo<KnownAEAD> ¶ms) |
| 104 | -> std::string { return params.param.name; }); |
| 105 | |
| 106 | // Tests an AEAD against a series of test vectors from a file, using the |
| 107 | // FileTest format. As an example, here's a valid test case: |
| 108 | // |
| 109 | // KEY: 5a19f3173586b4c42f8412f4d5a786531b3231753e9e00998aec12fda8df10e4 |
| 110 | // NONCE: 978105dfce667bf4 |
| 111 | // IN: 6a4583908d |
| 112 | // AD: b654574932 |
| 113 | // CT: 5294265a60 |
| 114 | // TAG: 1d45758621762e061368e68868e2f929 |
| 115 | TEST_P(PerAEADTest, TestVector) { |
| 116 | std::string test_vectors = "crypto/cipher_extra/test/"; |
| 117 | test_vectors += GetParam().test_vectors; |
| 118 | FileTestGTest(test_vectors.c_str(), [&](FileTest *t) { |
| 119 | std::vector<uint8_t> key, nonce, in, ad, ct, tag; |
| 120 | ASSERT_TRUE(t->GetBytes(&key, "KEY")); |
| 121 | ASSERT_TRUE(t->GetBytes(&nonce, "NONCE")); |
| 122 | ASSERT_TRUE(t->GetBytes(&in, "IN")); |
| 123 | ASSERT_TRUE(t->GetBytes(&ad, "AD")); |
| 124 | ASSERT_TRUE(t->GetBytes(&ct, "CT")); |
| 125 | ASSERT_TRUE(t->GetBytes(&tag, "TAG")); |
| 126 | size_t tag_len = tag.size(); |
| 127 | if (t->HasAttribute("TAG_LEN")) { |
| 128 | // Legacy AEADs are MAC-then-encrypt and may include padding in the TAG |
| 129 | // field. TAG_LEN contains the actual size of the digest in that case. |
| 130 | std::string tag_len_str; |
| 131 | ASSERT_TRUE(t->GetAttribute(&tag_len_str, "TAG_LEN")); |
| 132 | tag_len = strtoul(tag_len_str.c_str(), nullptr, 10); |
| 133 | ASSERT_TRUE(tag_len); |
| 134 | } |
| 135 | |
| 136 | bssl::ScopedEVP_AEAD_CTX ctx; |
| 137 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 138 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_seal)); |
| 139 | |
| 140 | std::vector<uint8_t> out(in.size() + EVP_AEAD_max_overhead(aead())); |
| 141 | if (!t->HasAttribute("NO_SEAL")) { |
| 142 | size_t out_len; |
| 143 | ASSERT_TRUE(EVP_AEAD_CTX_seal(ctx.get(), out.data(), &out_len, out.size(), |
| 144 | nonce.data(), nonce.size(), in.data(), |
| 145 | in.size(), ad.data(), ad.size())); |
| 146 | out.resize(out_len); |
| 147 | |
| 148 | ASSERT_EQ(out.size(), ct.size() + tag.size()); |
| 149 | EXPECT_EQ(Bytes(ct), Bytes(out.data(), ct.size())); |
| 150 | EXPECT_EQ(Bytes(tag), Bytes(out.data() + ct.size(), tag.size())); |
| 151 | } else { |
| 152 | out.resize(ct.size() + tag.size()); |
| 153 | OPENSSL_memcpy(out.data(), ct.data(), ct.size()); |
| 154 | OPENSSL_memcpy(out.data() + ct.size(), tag.data(), tag.size()); |
| 155 | } |
| 156 | |
| 157 | // The "stateful" AEADs for implementing pre-AEAD cipher suites need to be |
| 158 | // reset after each operation. |
| 159 | ctx.Reset(); |
| 160 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 161 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_open)); |
| 162 | |
| 163 | std::vector<uint8_t> out2(out.size()); |
| 164 | size_t out2_len; |
| 165 | int ret = EVP_AEAD_CTX_open(ctx.get(), out2.data(), &out2_len, out2.size(), |
| 166 | nonce.data(), nonce.size(), out.data(), |
| 167 | out.size(), ad.data(), ad.size()); |
| 168 | if (t->HasAttribute("FAILS")) { |
| 169 | ASSERT_FALSE(ret) << "Decrypted bad data."; |
| 170 | ERR_clear_error(); |
| 171 | return; |
| 172 | } |
| 173 | |
| 174 | ASSERT_TRUE(ret) << "Failed to decrypt."; |
| 175 | out2.resize(out2_len); |
| 176 | EXPECT_EQ(Bytes(in), Bytes(out2)); |
| 177 | |
| 178 | // The "stateful" AEADs for implementing pre-AEAD cipher suites need to be |
| 179 | // reset after each operation. |
| 180 | ctx.Reset(); |
| 181 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 182 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_open)); |
| 183 | |
| 184 | // Garbage at the end isn't ignored. |
| 185 | out.push_back(0); |
| 186 | out2.resize(out.size()); |
| 187 | EXPECT_FALSE(EVP_AEAD_CTX_open( |
| 188 | ctx.get(), out2.data(), &out2_len, out2.size(), nonce.data(), |
| 189 | nonce.size(), out.data(), out.size(), ad.data(), ad.size())) |
| 190 | << "Decrypted bad data with trailing garbage."; |
| 191 | ERR_clear_error(); |
| 192 | |
| 193 | // The "stateful" AEADs for implementing pre-AEAD cipher suites need to be |
| 194 | // reset after each operation. |
| 195 | ctx.Reset(); |
| 196 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 197 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_open)); |
| 198 | |
| 199 | // Verify integrity is checked. |
| 200 | out[0] ^= 0x80; |
| 201 | out.resize(out.size() - 1); |
| 202 | out2.resize(out.size()); |
| 203 | EXPECT_FALSE(EVP_AEAD_CTX_open( |
| 204 | ctx.get(), out2.data(), &out2_len, out2.size(), nonce.data(), |
| 205 | nonce.size(), out.data(), out.size(), ad.data(), ad.size())) |
| 206 | << "Decrypted bad data with corrupted byte."; |
| 207 | ERR_clear_error(); |
| 208 | }); |
| 209 | } |
| 210 | |
| 211 | TEST_P(PerAEADTest, TestVectorScatterGather) { |
| 212 | std::string test_vectors = "crypto/cipher_extra/test/"; |
| 213 | const KnownAEAD &aead_config = GetParam(); |
| 214 | test_vectors += aead_config.test_vectors; |
| 215 | FileTestGTest(test_vectors.c_str(), [&](FileTest *t) { |
| 216 | std::vector<uint8_t> key, nonce, in, ad, ct, tag; |
| 217 | ASSERT_TRUE(t->GetBytes(&key, "KEY")); |
| 218 | ASSERT_TRUE(t->GetBytes(&nonce, "NONCE")); |
| 219 | ASSERT_TRUE(t->GetBytes(&in, "IN")); |
| 220 | ASSERT_TRUE(t->GetBytes(&ad, "AD")); |
| 221 | ASSERT_TRUE(t->GetBytes(&ct, "CT")); |
| 222 | ASSERT_TRUE(t->GetBytes(&tag, "TAG")); |
| 223 | size_t tag_len = tag.size(); |
| 224 | if (t->HasAttribute("TAG_LEN")) { |
| 225 | // Legacy AEADs are MAC-then-encrypt and may include padding in the TAG |
| 226 | // field. TAG_LEN contains the actual size of the digest in that case. |
| 227 | std::string tag_len_str; |
| 228 | ASSERT_TRUE(t->GetAttribute(&tag_len_str, "TAG_LEN")); |
| 229 | tag_len = strtoul(tag_len_str.c_str(), nullptr, 10); |
| 230 | ASSERT_TRUE(tag_len); |
| 231 | } |
| 232 | |
| 233 | bssl::ScopedEVP_AEAD_CTX ctx; |
| 234 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 235 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_seal)); |
| 236 | |
| 237 | std::vector<uint8_t> out(in.size()); |
| 238 | std::vector<uint8_t> out_tag(EVP_AEAD_max_overhead(aead())); |
| 239 | if (!t->HasAttribute("NO_SEAL")) { |
| 240 | size_t out_tag_len; |
| 241 | ASSERT_TRUE(EVP_AEAD_CTX_seal_scatter( |
| 242 | ctx.get(), out.data(), out_tag.data(), &out_tag_len, out_tag.size(), |
| 243 | nonce.data(), nonce.size(), in.data(), in.size(), ad.data(), |
| 244 | ad.size())); |
| 245 | out_tag.resize(out_tag_len); |
| 246 | |
| 247 | ASSERT_EQ(out.size(), ct.size()); |
| 248 | ASSERT_EQ(out_tag.size(), tag.size()); |
| 249 | EXPECT_EQ(Bytes(ct), Bytes(out.data(), ct.size())); |
| 250 | EXPECT_EQ(Bytes(tag), Bytes(out_tag.data(), tag.size())); |
| 251 | } else { |
| 252 | out.resize(ct.size()); |
| 253 | out_tag.resize(tag.size()); |
| 254 | OPENSSL_memcpy(out.data(), ct.data(), ct.size()); |
| 255 | OPENSSL_memcpy(out_tag.data(), tag.data(), tag.size()); |
| 256 | } |
| 257 | |
| 258 | // The "stateful" AEADs for implementing pre-AEAD cipher suites need to be |
| 259 | // reset after each operation. |
| 260 | ctx.Reset(); |
| 261 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 262 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_open)); |
| 263 | |
| 264 | std::vector<uint8_t> out2(out.size()); |
| 265 | int ret = EVP_AEAD_CTX_open_gather( |
| 266 | ctx.get(), out2.data(), nonce.data(), nonce.size(), out.data(), |
| 267 | out.size(), out_tag.data(), out_tag.size(), ad.data(), ad.size()); |
| 268 | |
| 269 | // Skip decryption for AEADs that don't implement open_gather(). |
| 270 | if (!ret) { |
| 271 | int err = ERR_peek_error(); |
| 272 | if (ERR_GET_LIB(err) == ERR_LIB_CIPHER && |
| 273 | ERR_GET_REASON(err) == CIPHER_R_CTRL_NOT_IMPLEMENTED) { |
| 274 | (void)t->HasAttribute("FAILS"); // All attributes need to be used. |
| 275 | return; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | if (t->HasAttribute("FAILS")) { |
| 280 | ASSERT_FALSE(ret) << "Decrypted bad data"; |
| 281 | ERR_clear_error(); |
| 282 | return; |
| 283 | } |
| 284 | |
| 285 | ASSERT_TRUE(ret) << "Failed to decrypt: " |
| 286 | << ERR_reason_error_string(ERR_get_error()); |
| 287 | EXPECT_EQ(Bytes(in), Bytes(out2)); |
| 288 | |
| 289 | // The "stateful" AEADs for implementing pre-AEAD cipher suites need to be |
| 290 | // reset after each operation. |
| 291 | ctx.Reset(); |
| 292 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 293 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_open)); |
| 294 | |
| 295 | // Garbage at the end isn't ignored. |
| 296 | out_tag.push_back(0); |
| 297 | out2.resize(out.size()); |
| 298 | EXPECT_FALSE(EVP_AEAD_CTX_open_gather( |
| 299 | ctx.get(), out2.data(), nonce.data(), nonce.size(), out.data(), |
| 300 | out.size(), out_tag.data(), out_tag.size(), ad.data(), ad.size())) |
| 301 | << "Decrypted bad data with trailing garbage."; |
| 302 | ERR_clear_error(); |
| 303 | |
| 304 | // The "stateful" AEADs for implementing pre-AEAD cipher suites need to be |
| 305 | // reset after each operation. |
| 306 | ctx.Reset(); |
| 307 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 308 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_open)); |
| 309 | |
| 310 | // Verify integrity is checked. |
| 311 | out_tag[0] ^= 0x80; |
| 312 | out_tag.resize(out_tag.size() - 1); |
| 313 | out2.resize(out.size()); |
| 314 | EXPECT_FALSE(EVP_AEAD_CTX_open_gather( |
| 315 | ctx.get(), out2.data(), nonce.data(), nonce.size(), out.data(), |
| 316 | out.size(), out_tag.data(), out_tag.size(), ad.data(), ad.size())) |
| 317 | << "Decrypted bad data with corrupted byte."; |
| 318 | ERR_clear_error(); |
| 319 | |
| 320 | ctx.Reset(); |
| 321 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 322 | ctx.get(), aead(), key.data(), key.size(), tag_len, evp_aead_open)); |
| 323 | |
| 324 | // Check edge case for tag length. |
| 325 | EXPECT_FALSE(EVP_AEAD_CTX_open_gather( |
| 326 | ctx.get(), out2.data(), nonce.data(), nonce.size(), out.data(), |
| 327 | out.size(), out_tag.data(), 0, ad.data(), ad.size())) |
| 328 | << "Decrypted bad data with corrupted byte."; |
| 329 | ERR_clear_error(); |
| 330 | }); |
| 331 | } |
| 332 | |
| 333 | TEST_P(PerAEADTest, CleanupAfterInitFailure) { |
| 334 | uint8_t key[EVP_AEAD_MAX_KEY_LENGTH]; |
| 335 | OPENSSL_memset(key, 0, sizeof(key)); |
| 336 | const size_t key_len = EVP_AEAD_key_length(aead()); |
| 337 | ASSERT_GE(sizeof(key), key_len); |
| 338 | |
| 339 | EVP_AEAD_CTX ctx; |
| 340 | ASSERT_FALSE(EVP_AEAD_CTX_init( |
| 341 | &ctx, aead(), key, key_len, |
| 342 | 9999 /* a silly tag length to trigger an error */, NULL /* ENGINE */)); |
| 343 | ERR_clear_error(); |
| 344 | |
| 345 | /* Running a second, failed _init should not cause a memory leak. */ |
| 346 | ASSERT_FALSE(EVP_AEAD_CTX_init( |
| 347 | &ctx, aead(), key, key_len, |
| 348 | 9999 /* a silly tag length to trigger an error */, NULL /* ENGINE */)); |
| 349 | ERR_clear_error(); |
| 350 | |
| 351 | /* Calling _cleanup on an |EVP_AEAD_CTX| after a failed _init should be a |
| 352 | * no-op. */ |
| 353 | EVP_AEAD_CTX_cleanup(&ctx); |
| 354 | } |
| 355 | |
| 356 | TEST_P(PerAEADTest, TruncatedTags) { |
| 357 | if (!GetParam().truncated_tags) { |
| 358 | return; |
| 359 | } |
| 360 | |
| 361 | uint8_t key[EVP_AEAD_MAX_KEY_LENGTH]; |
| 362 | OPENSSL_memset(key, 0, sizeof(key)); |
| 363 | const size_t key_len = EVP_AEAD_key_length(aead()); |
| 364 | ASSERT_GE(sizeof(key), key_len); |
| 365 | |
| 366 | uint8_t nonce[EVP_AEAD_MAX_NONCE_LENGTH]; |
| 367 | OPENSSL_memset(nonce, 0, sizeof(nonce)); |
| 368 | const size_t nonce_len = EVP_AEAD_nonce_length(aead()); |
| 369 | ASSERT_GE(sizeof(nonce), nonce_len); |
| 370 | |
| 371 | bssl::ScopedEVP_AEAD_CTX ctx; |
| 372 | ASSERT_TRUE(EVP_AEAD_CTX_init(ctx.get(), aead(), key, key_len, |
| 373 | 1 /* one byte tag */, NULL /* ENGINE */)); |
| 374 | |
| 375 | const uint8_t plaintext[1] = {'A'}; |
| 376 | |
| 377 | uint8_t ciphertext[128]; |
| 378 | size_t ciphertext_len; |
| 379 | constexpr uint8_t kSentinel = 42; |
| 380 | OPENSSL_memset(ciphertext, kSentinel, sizeof(ciphertext)); |
| 381 | |
| 382 | ASSERT_TRUE(EVP_AEAD_CTX_seal(ctx.get(), ciphertext, &ciphertext_len, |
| 383 | sizeof(ciphertext), nonce, nonce_len, plaintext, |
| 384 | sizeof(plaintext), nullptr /* ad */, 0)); |
| 385 | |
| 386 | for (size_t i = ciphertext_len; i < sizeof(ciphertext); i++) { |
| 387 | // Sealing must not write past where it said it did. |
| 388 | EXPECT_EQ(kSentinel, ciphertext[i]) |
| 389 | << "Sealing wrote off the end of the buffer."; |
| 390 | } |
| 391 | |
| 392 | const size_t overhead_used = ciphertext_len - sizeof(plaintext); |
| 393 | const size_t expected_overhead = |
| 394 | 1 + EVP_AEAD_max_overhead(aead()) - EVP_AEAD_max_tag_len(aead()); |
| 395 | EXPECT_EQ(overhead_used, expected_overhead) |
| 396 | << "AEAD is probably ignoring request to truncate tags."; |
| 397 | |
| 398 | uint8_t plaintext2[sizeof(plaintext) + 16]; |
| 399 | OPENSSL_memset(plaintext2, kSentinel, sizeof(plaintext2)); |
| 400 | |
| 401 | size_t plaintext2_len; |
| 402 | ASSERT_TRUE(EVP_AEAD_CTX_open( |
| 403 | ctx.get(), plaintext2, &plaintext2_len, sizeof(plaintext2), nonce, |
| 404 | nonce_len, ciphertext, ciphertext_len, nullptr /* ad */, 0)) |
| 405 | << "Opening with truncated tag didn't work."; |
| 406 | |
| 407 | for (size_t i = plaintext2_len; i < sizeof(plaintext2); i++) { |
| 408 | // Likewise, opening should also stay within bounds. |
| 409 | EXPECT_EQ(kSentinel, plaintext2[i]) |
| 410 | << "Opening wrote off the end of the buffer."; |
| 411 | } |
| 412 | |
| 413 | EXPECT_EQ(Bytes(plaintext), Bytes(plaintext2, plaintext2_len)); |
| 414 | } |
| 415 | |
| 416 | TEST_P(PerAEADTest, AliasedBuffers) { |
| 417 | if (GetParam().limited_implementation) { |
| 418 | return; |
| 419 | } |
| 420 | |
| 421 | const size_t key_len = EVP_AEAD_key_length(aead()); |
| 422 | const size_t nonce_len = EVP_AEAD_nonce_length(aead()); |
| 423 | const size_t max_overhead = EVP_AEAD_max_overhead(aead()); |
| 424 | |
| 425 | std::vector<uint8_t> key(key_len, 'a'); |
| 426 | bssl::ScopedEVP_AEAD_CTX ctx; |
| 427 | ASSERT_TRUE(EVP_AEAD_CTX_init(ctx.get(), aead(), key.data(), key_len, |
| 428 | EVP_AEAD_DEFAULT_TAG_LENGTH, nullptr)); |
| 429 | |
| 430 | static const uint8_t kPlaintext[260] = |
| 431 | "testing123456testing123456testing123456testing123456testing123456testing" |
| 432 | "123456testing123456testing123456testing123456testing123456testing123456t" |
| 433 | "esting123456testing123456testing123456testing123456testing123456testing1" |
| 434 | "23456testing123456testing123456testing12345"; |
| 435 | const std::vector<size_t> offsets = { |
| 436 | 0, 1, 2, 8, 15, 16, 17, 31, 32, 33, 63, |
| 437 | 64, 65, 95, 96, 97, 127, 128, 129, 255, 256, 257, |
| 438 | }; |
| 439 | |
| 440 | std::vector<uint8_t> nonce(nonce_len, 'b'); |
| 441 | std::vector<uint8_t> valid_encryption(sizeof(kPlaintext) + max_overhead); |
| 442 | size_t valid_encryption_len; |
| 443 | ASSERT_TRUE(EVP_AEAD_CTX_seal( |
| 444 | ctx.get(), valid_encryption.data(), &valid_encryption_len, |
| 445 | sizeof(kPlaintext) + max_overhead, nonce.data(), nonce_len, kPlaintext, |
| 446 | sizeof(kPlaintext), nullptr, 0)) |
| 447 | << "EVP_AEAD_CTX_seal failed with disjoint buffers."; |
| 448 | |
| 449 | // Test with out != in which we expect to fail. |
| 450 | std::vector<uint8_t> buffer(2 + valid_encryption_len); |
| 451 | uint8_t *in = buffer.data() + 1; |
| 452 | uint8_t *out1 = buffer.data(); |
| 453 | uint8_t *out2 = buffer.data() + 2; |
| 454 | |
| 455 | OPENSSL_memcpy(in, kPlaintext, sizeof(kPlaintext)); |
| 456 | size_t out_len; |
| 457 | EXPECT_FALSE(EVP_AEAD_CTX_seal( |
| 458 | ctx.get(), out1 /* in - 1 */, &out_len, sizeof(kPlaintext) + max_overhead, |
| 459 | nonce.data(), nonce_len, in, sizeof(kPlaintext), nullptr, 0)); |
| 460 | EXPECT_FALSE(EVP_AEAD_CTX_seal( |
| 461 | ctx.get(), out2 /* in + 1 */, &out_len, sizeof(kPlaintext) + max_overhead, |
| 462 | nonce.data(), nonce_len, in, sizeof(kPlaintext), nullptr, 0)); |
| 463 | ERR_clear_error(); |
| 464 | |
| 465 | OPENSSL_memcpy(in, valid_encryption.data(), valid_encryption_len); |
| 466 | EXPECT_FALSE(EVP_AEAD_CTX_open(ctx.get(), out1 /* in - 1 */, &out_len, |
| 467 | valid_encryption_len, nonce.data(), nonce_len, |
| 468 | in, valid_encryption_len, nullptr, 0)); |
| 469 | EXPECT_FALSE(EVP_AEAD_CTX_open(ctx.get(), out2 /* in + 1 */, &out_len, |
| 470 | valid_encryption_len, nonce.data(), nonce_len, |
| 471 | in, valid_encryption_len, nullptr, 0)); |
| 472 | ERR_clear_error(); |
| 473 | |
| 474 | // Test with out == in, which we expect to work. |
| 475 | OPENSSL_memcpy(in, kPlaintext, sizeof(kPlaintext)); |
| 476 | |
| 477 | ASSERT_TRUE(EVP_AEAD_CTX_seal(ctx.get(), in, &out_len, |
| 478 | sizeof(kPlaintext) + max_overhead, nonce.data(), |
| 479 | nonce_len, in, sizeof(kPlaintext), nullptr, 0)); |
| 480 | EXPECT_EQ(Bytes(valid_encryption.data(), valid_encryption_len), |
| 481 | Bytes(in, out_len)); |
| 482 | |
| 483 | OPENSSL_memcpy(in, valid_encryption.data(), valid_encryption_len); |
| 484 | ASSERT_TRUE(EVP_AEAD_CTX_open(ctx.get(), in, &out_len, valid_encryption_len, |
| 485 | nonce.data(), nonce_len, in, |
| 486 | valid_encryption_len, nullptr, 0)); |
| 487 | EXPECT_EQ(Bytes(kPlaintext), Bytes(in, out_len)); |
| 488 | } |
| 489 | |
| 490 | TEST_P(PerAEADTest, UnalignedInput) { |
| 491 | alignas(64) uint8_t key[EVP_AEAD_MAX_KEY_LENGTH + 1]; |
| 492 | alignas(64) uint8_t nonce[EVP_AEAD_MAX_NONCE_LENGTH + 1]; |
| 493 | alignas(64) uint8_t plaintext[32 + 1]; |
| 494 | alignas(64) uint8_t ad[32 + 1]; |
| 495 | OPENSSL_memset(key, 'K', sizeof(key)); |
| 496 | OPENSSL_memset(nonce, 'N', sizeof(nonce)); |
| 497 | OPENSSL_memset(plaintext, 'P', sizeof(plaintext)); |
| 498 | OPENSSL_memset(ad, 'A', sizeof(ad)); |
| 499 | const size_t key_len = EVP_AEAD_key_length(aead()); |
| 500 | ASSERT_GE(sizeof(key) - 1, key_len); |
| 501 | const size_t nonce_len = EVP_AEAD_nonce_length(aead()); |
| 502 | ASSERT_GE(sizeof(nonce) - 1, nonce_len); |
| 503 | const size_t ad_len = |
| 504 | GetParam().ad_len != 0 ? GetParam().ad_len : sizeof(ad) - 1; |
| 505 | ASSERT_GE(sizeof(ad) - 1, ad_len); |
| 506 | |
| 507 | // Encrypt some input. |
| 508 | bssl::ScopedEVP_AEAD_CTX ctx; |
| 509 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 510 | ctx.get(), aead(), key + 1, key_len, EVP_AEAD_DEFAULT_TAG_LENGTH, |
| 511 | evp_aead_seal)); |
| 512 | alignas(64) uint8_t ciphertext[sizeof(plaintext) + EVP_AEAD_MAX_OVERHEAD]; |
| 513 | size_t ciphertext_len; |
| 514 | ASSERT_TRUE(EVP_AEAD_CTX_seal(ctx.get(), ciphertext + 1, &ciphertext_len, |
| 515 | sizeof(ciphertext) - 1, nonce + 1, nonce_len, |
| 516 | plaintext + 1, sizeof(plaintext) - 1, ad + 1, |
| 517 | ad_len)); |
| 518 | |
| 519 | // It must successfully decrypt. |
| 520 | alignas(64) uint8_t out[sizeof(ciphertext)]; |
| 521 | ctx.Reset(); |
| 522 | ASSERT_TRUE(EVP_AEAD_CTX_init_with_direction( |
| 523 | ctx.get(), aead(), key + 1, key_len, EVP_AEAD_DEFAULT_TAG_LENGTH, |
| 524 | evp_aead_open)); |
| 525 | size_t out_len; |
| 526 | ASSERT_TRUE(EVP_AEAD_CTX_open(ctx.get(), out + 1, &out_len, sizeof(out) - 1, |
| 527 | nonce + 1, nonce_len, ciphertext + 1, |
| 528 | ciphertext_len, ad + 1, ad_len)); |
| 529 | EXPECT_EQ(Bytes(plaintext + 1, sizeof(plaintext) - 1), |
| 530 | Bytes(out + 1, out_len)); |
| 531 | } |
| 532 | |
| 533 | // Test that EVP_aead_aes_128_gcm and EVP_aead_aes_256_gcm reject empty nonces. |
| 534 | // AES-GCM is not defined for those. |
| 535 | TEST(AEADTest, AESGCMEmptyNonce) { |
| 536 | static const uint8_t kZeros[32] = {0}; |
| 537 | |
| 538 | // Test AES-128-GCM. |
| 539 | uint8_t buf[16]; |
| 540 | size_t len; |
| 541 | bssl::ScopedEVP_AEAD_CTX ctx; |
| 542 | ASSERT_TRUE(EVP_AEAD_CTX_init(ctx.get(), EVP_aead_aes_128_gcm(), kZeros, 16, |
| 543 | EVP_AEAD_DEFAULT_TAG_LENGTH, nullptr)); |
| 544 | |
| 545 | EXPECT_FALSE(EVP_AEAD_CTX_seal(ctx.get(), buf, &len, sizeof(buf), |
| 546 | nullptr /* nonce */, 0, nullptr /* in */, 0, |
| 547 | nullptr /* ad */, 0)); |
| 548 | uint32_t err = ERR_get_error(); |
| 549 | EXPECT_EQ(ERR_LIB_CIPHER, ERR_GET_LIB(err)); |
| 550 | EXPECT_EQ(CIPHER_R_INVALID_NONCE_SIZE, ERR_GET_REASON(err)); |
| 551 | |
| 552 | EXPECT_FALSE(EVP_AEAD_CTX_open(ctx.get(), buf, &len, sizeof(buf), |
| 553 | nullptr /* nonce */, 0, kZeros /* in */, |
| 554 | sizeof(kZeros), nullptr /* ad */, 0)); |
| 555 | err = ERR_get_error(); |
| 556 | EXPECT_EQ(ERR_LIB_CIPHER, ERR_GET_LIB(err)); |
| 557 | EXPECT_EQ(CIPHER_R_INVALID_NONCE_SIZE, ERR_GET_REASON(err)); |
| 558 | |
| 559 | // Test AES-256-GCM. |
| 560 | ctx.Reset(); |
| 561 | ASSERT_TRUE(EVP_AEAD_CTX_init(ctx.get(), EVP_aead_aes_256_gcm(), kZeros, 32, |
| 562 | EVP_AEAD_DEFAULT_TAG_LENGTH, nullptr)); |
| 563 | |
| 564 | EXPECT_FALSE(EVP_AEAD_CTX_seal(ctx.get(), buf, &len, sizeof(buf), |
| 565 | nullptr /* nonce */, 0, nullptr /* in */, 0, |
| 566 | nullptr /* ad */, 0)); |
| 567 | err = ERR_get_error(); |
| 568 | EXPECT_EQ(ERR_LIB_CIPHER, ERR_GET_LIB(err)); |
| 569 | EXPECT_EQ(CIPHER_R_INVALID_NONCE_SIZE, ERR_GET_REASON(err)); |
| 570 | |
| 571 | EXPECT_FALSE(EVP_AEAD_CTX_open(ctx.get(), buf, &len, sizeof(buf), |
| 572 | nullptr /* nonce */, 0, kZeros /* in */, |
| 573 | sizeof(kZeros), nullptr /* ad */, 0)); |
| 574 | err = ERR_get_error(); |
| 575 | EXPECT_EQ(ERR_LIB_CIPHER, ERR_GET_LIB(err)); |
| 576 | EXPECT_EQ(CIPHER_R_INVALID_NONCE_SIZE, ERR_GET_REASON(err)); |
| 577 | } |