1/* Copyright (c) 2015, 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 <gtest/gtest.h> 16 17#include <openssl/digest.h> 18#include <openssl/evp.h> 19 20#include "../internal.h" 21#include "../test/test_util.h" 22 23 24// Tests deriving a key using an empty password (specified both as NULL and as 25// non-NULL). Note that NULL has special meaning to HMAC initialization. 26TEST(PBKDFTest, EmptyPassword) { 27 const uint8_t kKey[] = {0xa3, 0x3d, 0xdd, 0xc3, 0x04, 0x78, 0x18, 28 0x55, 0x15, 0x31, 0x1f, 0x87, 0x52, 0x89, 29 0x5d, 0x36, 0xea, 0x43, 0x63, 0xa2}; 30 uint8_t key[sizeof(kKey)]; 31 32 ASSERT_TRUE(PKCS5_PBKDF2_HMAC(NULL, 0, (const uint8_t *)"salt", 4, 1, 33 EVP_sha1(), sizeof(kKey), key)); 34 EXPECT_EQ(Bytes(kKey), Bytes(key)); 35 36 ASSERT_TRUE(PKCS5_PBKDF2_HMAC("", 0, (const uint8_t *)"salt", 4, 1, 37 EVP_sha1(), sizeof(kKey), key)); 38 EXPECT_EQ(Bytes(kKey), Bytes(key)); 39} 40 41// Tests deriving a key using an empty salt. Note that the expectation was 42// generated using OpenSSL itself, and hence is not verified. 43TEST(PBKDFTest, EmptySalt) { 44 const uint8_t kKey[] = {0x8b, 0xc2, 0xf9, 0x16, 0x7a, 0x81, 0xcd, 0xcf, 45 0xad, 0x12, 0x35, 0xcd, 0x90, 0x47, 0xf1, 0x13, 46 0x62, 0x71, 0xc1, 0xf9, 0x78, 0xfc, 0xfc, 0xb3, 47 0x5e, 0x22, 0xdb, 0xea, 0xfa, 0x46, 0x34, 0xf6}; 48 uint8_t key[sizeof(kKey)]; 49 50 ASSERT_TRUE(PKCS5_PBKDF2_HMAC("password", 8, NULL, 0, 2, EVP_sha256(), 51 sizeof(kKey), key)); 52 EXPECT_EQ(Bytes(kKey), Bytes(key)); 53 54 ASSERT_TRUE(PKCS5_PBKDF2_HMAC("password", 8, (const uint8_t *)"", 0, 2, 55 EVP_sha256(), sizeof(kKey), key)); 56 EXPECT_EQ(Bytes(kKey), Bytes(key)); 57} 58 59// Exercises test vectors taken from https://tools.ietf.org/html/rfc6070. 60// Note that each of these test vectors uses SHA-1 as the digest. 61TEST(PBKDFTest, RFC6070Vectors) { 62 const uint8_t kKey1[] = {0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 63 0x71, 0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 64 0x12, 0x06, 0x2f, 0xe0, 0x37, 0xa6}; 65 const uint8_t kKey2[] = {0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 66 0x8c, 0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 67 0x41, 0xf0, 0xd8, 0xde, 0x89, 0x57}; 68 const uint8_t kKey3[] = {0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d, 69 0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3}; 70 uint8_t key[sizeof(kKey1)]; 71 static_assert(sizeof(key) >= sizeof(kKey2), "output too small"); 72 static_assert(sizeof(key) >= sizeof(kKey3), "output too small"); 73 74 ASSERT_TRUE(PKCS5_PBKDF2_HMAC("password", 8, (const uint8_t *)"salt", 4, 1, 75 EVP_sha1(), sizeof(kKey1), key)); 76 EXPECT_EQ(Bytes(kKey1), Bytes(key, sizeof(kKey1))); 77 78 ASSERT_TRUE(PKCS5_PBKDF2_HMAC("password", 8, (const uint8_t *)"salt", 4, 2, 79 EVP_sha1(), sizeof(kKey2), key)); 80 EXPECT_EQ(Bytes(kKey2), Bytes(key, sizeof(kKey2))); 81 82 ASSERT_TRUE(PKCS5_PBKDF2_HMAC("pass\0word", 9, (const uint8_t *)"sa\0lt", 5, 83 4096, EVP_sha1(), sizeof(kKey3), key)); 84 EXPECT_EQ(Bytes(kKey3), Bytes(key, sizeof(kKey3))); 85} 86 87// Tests key derivation using SHA-2 digests. 88TEST(PBKDFTest, SHA2) { 89 // This test was taken from: 90 // http://stackoverflow.com/questions/5130513/pbkdf2-hmac-sha2-test-vectors. 91 const uint8_t kKey1[] = {0xae, 0x4d, 0x0c, 0x95, 0xaf, 0x6b, 0x46, 0xd3, 92 0x2d, 0x0a, 0xdf, 0xf9, 0x28, 0xf0, 0x6d, 0xd0, 93 0x2a, 0x30, 0x3f, 0x8e, 0xf3, 0xc2, 0x51, 0xdf, 94 0xd6, 0xe2, 0xd8, 0x5a, 0x95, 0x47, 0x4c, 0x43}; 95 96 // This test was taken from: 97 // http://stackoverflow.com/questions/15593184/pbkdf2-hmac-sha-512-test-vectors. 98 const uint8_t kKey2[] = { 99 0x8c, 0x05, 0x11, 0xf4, 0xc6, 0xe5, 0x97, 0xc6, 0xac, 0x63, 0x15, 100 0xd8, 0xf0, 0x36, 0x2e, 0x22, 0x5f, 0x3c, 0x50, 0x14, 0x95, 0xba, 101 0x23, 0xb8, 0x68, 0xc0, 0x05, 0x17, 0x4d, 0xc4, 0xee, 0x71, 0x11, 102 0x5b, 0x59, 0xf9, 0xe6, 0x0c, 0xd9, 0x53, 0x2f, 0xa3, 0x3e, 0x0f, 103 0x75, 0xae, 0xfe, 0x30, 0x22, 0x5c, 0x58, 0x3a, 0x18, 0x6c, 0xd8, 104 0x2b, 0xd4, 0xda, 0xea, 0x97, 0x24, 0xa3, 0xd3, 0xb8}; 105 106 uint8_t key[sizeof(kKey2)]; 107 static_assert(sizeof(key) >= sizeof(kKey1), "output too small"); 108 109 ASSERT_TRUE(PKCS5_PBKDF2_HMAC("password", 8, (const uint8_t *)"salt", 4, 2, 110 EVP_sha256(), sizeof(kKey1), key)); 111 EXPECT_EQ(Bytes(kKey1), Bytes(key, sizeof(kKey1))); 112 113 ASSERT_TRUE( 114 PKCS5_PBKDF2_HMAC("passwordPASSWORDpassword", 24, 115 (const uint8_t *)"saltSALTsaltSALTsaltSALTsaltSALTsalt", 116 36, 4096, EVP_sha512(), sizeof(kKey2), key)); 117 EXPECT_EQ(Bytes(kKey2), Bytes(key, sizeof(kKey2))); 118} 119 120// Tests key derivation using iterations=0. 121// 122// RFC 2898 defines the iteration count (c) as a "positive integer". So doing a 123// key derivation with iterations=0 is ill-defined and should result in a 124// failure. 125TEST(PBKDFTest, ZeroIterations) { 126 static const char kPassword[] = "password"; 127 const size_t password_len = strlen(kPassword); 128 static const uint8_t kSalt[] = {1, 2, 3, 4}; 129 const size_t salt_len = sizeof(kSalt); 130 const EVP_MD *digest = EVP_sha1(); 131 132 uint8_t key[10] = {0}; 133 const size_t key_len = sizeof(key); 134 135 // Verify that calling with iterations=1 works. 136 ASSERT_TRUE(PKCS5_PBKDF2_HMAC(kPassword, password_len, kSalt, salt_len, 137 1 /* iterations */, digest, key_len, key)); 138 139 // Flip the first key byte (so can later test if it got set). 140 const uint8_t expected_first_byte = key[0]; 141 key[0] = ~key[0]; 142 143 // However calling it with iterations=0 fails. 144 ASSERT_FALSE(PKCS5_PBKDF2_HMAC(kPassword, password_len, kSalt, salt_len, 145 0 /* iterations */, digest, key_len, key)); 146 147 // For backwards compatibility, the iterations == 0 case still fills in 148 // the out key. 149 EXPECT_EQ(expected_first_byte, key[0]); 150} 151