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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "crypto/symmetric_key.h" | |
| 6 | |
| 7 #include <nss.h> | |
| 8 #include <pk11pub.h> | |
| 9 #include <stddef.h> | |
| 10 | |
| 11 #include "base/logging.h" | |
| 12 #include "crypto/nss_util.h" | |
| 13 #include "crypto/scoped_nss_types.h" | |
| 14 | |
| 15 namespace crypto { | |
| 16 | |
| 17 SymmetricKey::~SymmetricKey() {} | |
| 18 | |
| 19 // static | |
| 20 SymmetricKey* SymmetricKey::GenerateRandomKey(Algorithm algorithm, | |
| 21 size_t key_size_in_bits) { | |
| 22 DCHECK_EQ(AES, algorithm); | |
| 23 | |
| 24 EnsureNSSInit(); | |
| 25 | |
| 26 // Whitelist supported key sizes to avoid accidentaly relying on | |
| 27 // algorithms available in NSS but not BoringSSL and vice | |
| 28 // versa. Note that BoringSSL does not support AES-192. | |
| 29 if (key_size_in_bits != 128 && key_size_in_bits != 256) | |
| 30 return NULL; | |
| 31 | |
| 32 ScopedPK11Slot slot(PK11_GetInternalSlot()); | |
| 33 if (!slot.get()) | |
| 34 return NULL; | |
| 35 | |
| 36 PK11SymKey* sym_key = PK11_KeyGen(slot.get(), CKM_AES_KEY_GEN, NULL, | |
| 37 key_size_in_bits / 8, NULL); | |
| 38 if (!sym_key) | |
| 39 return NULL; | |
| 40 | |
| 41 return new SymmetricKey(sym_key); | |
| 42 } | |
| 43 | |
| 44 // static | |
| 45 SymmetricKey* SymmetricKey::DeriveKeyFromPassword(Algorithm algorithm, | |
| 46 const std::string& password, | |
| 47 const std::string& salt, | |
| 48 size_t iterations, | |
| 49 size_t key_size_in_bits) { | |
| 50 EnsureNSSInit(); | |
| 51 if (salt.empty() || iterations == 0 || key_size_in_bits == 0) | |
| 52 return NULL; | |
| 53 | |
| 54 if (algorithm == AES) { | |
| 55 // Whitelist supported key sizes to avoid accidentaly relying on | |
| 56 // algorithms available in NSS but not BoringSSL and vice | |
| 57 // versa. Note that BoringSSL does not support AES-192. | |
| 58 if (key_size_in_bits != 128 && key_size_in_bits != 256) | |
| 59 return NULL; | |
| 60 } | |
| 61 | |
| 62 SECItem password_item; | |
| 63 password_item.type = siBuffer; | |
| 64 password_item.data = reinterpret_cast<unsigned char*>( | |
| 65 const_cast<char *>(password.data())); | |
| 66 password_item.len = password.size(); | |
| 67 | |
| 68 SECItem salt_item; | |
| 69 salt_item.type = siBuffer; | |
| 70 salt_item.data = reinterpret_cast<unsigned char*>( | |
| 71 const_cast<char *>(salt.data())); | |
| 72 salt_item.len = salt.size(); | |
| 73 | |
| 74 SECOidTag cipher_algorithm = | |
| 75 algorithm == AES ? SEC_OID_AES_256_CBC : SEC_OID_HMAC_SHA1; | |
| 76 ScopedSECAlgorithmID alg_id(PK11_CreatePBEV2AlgorithmID(SEC_OID_PKCS5_PBKDF2, | |
| 77 cipher_algorithm, | |
| 78 SEC_OID_HMAC_SHA1, | |
| 79 key_size_in_bits / 8, | |
| 80 iterations, | |
| 81 &salt_item)); | |
| 82 if (!alg_id.get()) | |
| 83 return NULL; | |
| 84 | |
| 85 ScopedPK11Slot slot(PK11_GetInternalSlot()); | |
| 86 if (!slot.get()) | |
| 87 return NULL; | |
| 88 | |
| 89 PK11SymKey* sym_key = PK11_PBEKeyGen(slot.get(), alg_id.get(), &password_item, | |
| 90 PR_FALSE, NULL); | |
| 91 if (!sym_key) | |
| 92 return NULL; | |
| 93 | |
| 94 return new SymmetricKey(sym_key); | |
| 95 } | |
| 96 | |
| 97 // static | |
| 98 SymmetricKey* SymmetricKey::Import(Algorithm algorithm, | |
| 99 const std::string& raw_key) { | |
| 100 EnsureNSSInit(); | |
| 101 | |
| 102 if (algorithm == AES) { | |
| 103 // Whitelist supported key sizes to avoid accidentaly relying on | |
| 104 // algorithms available in NSS but not BoringSSL and vice | |
| 105 // versa. Note that BoringSSL does not support AES-192. | |
| 106 if (raw_key.size() != 128/8 && raw_key.size() != 256/8) | |
| 107 return NULL; | |
| 108 } | |
| 109 | |
| 110 CK_MECHANISM_TYPE cipher = | |
| 111 algorithm == AES ? CKM_AES_CBC : CKM_SHA_1_HMAC; | |
| 112 | |
| 113 SECItem key_item; | |
| 114 key_item.type = siBuffer; | |
| 115 key_item.data = reinterpret_cast<unsigned char*>( | |
| 116 const_cast<char *>(raw_key.data())); | |
| 117 key_item.len = raw_key.size(); | |
| 118 | |
| 119 ScopedPK11Slot slot(PK11_GetInternalSlot()); | |
| 120 if (!slot.get()) | |
| 121 return NULL; | |
| 122 | |
| 123 // The exact value of the |origin| argument doesn't matter to NSS as long as | |
| 124 // it's not PK11_OriginFortezzaHack, so we pass PK11_OriginUnwrap as a | |
| 125 // placeholder. | |
| 126 PK11SymKey* sym_key = PK11_ImportSymKey(slot.get(), cipher, PK11_OriginUnwrap, | |
| 127 CKA_ENCRYPT, &key_item, NULL); | |
| 128 if (!sym_key) | |
| 129 return NULL; | |
| 130 | |
| 131 return new SymmetricKey(sym_key); | |
| 132 } | |
| 133 | |
| 134 bool SymmetricKey::GetRawKey(std::string* raw_key) { | |
| 135 SECStatus rv = PK11_ExtractKeyValue(key_.get()); | |
| 136 if (SECSuccess != rv) | |
| 137 return false; | |
| 138 | |
| 139 SECItem* key_item = PK11_GetKeyData(key_.get()); | |
| 140 if (!key_item) | |
| 141 return false; | |
| 142 | |
| 143 raw_key->assign(reinterpret_cast<char*>(key_item->data), key_item->len); | |
| 144 return true; | |
| 145 } | |
| 146 | |
| 147 SymmetricKey::SymmetricKey(PK11SymKey* key) : key_(key) { | |
| 148 DCHECK(key); | |
| 149 } | |
| 150 | |
| 151 } // namespace crypto | |
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Chromium Code Reviews
Issue 1882433002:
Removing NSS files and USE_OPENSSL flag (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master