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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 | |
| 10 #include "base/logging.h" | |
| 11 #include "crypto/nss_util.h" | |
| 12 | |
| 13 namespace crypto { | |
| 14 | |
| 15 SymmetricKey::~SymmetricKey() {} | |
| 16 | |
| 17 // static | |
| 18 SymmetricKey* SymmetricKey::GenerateRandomKey(Algorithm algorithm, | |
| 19 size_t key_size_in_bits) { | |
| 20 DCHECK_EQ(AES, algorithm); | |
| 21 | |
| 22 EnsureNSSInit(); | |
| 23 | |
| 24 // Whitelist supported key sizes to avoid accidentaly relying on | |
| 25 // algorithms available in NSS but not BoringSSL and vice | |
| 26 // versa. Note that BoringSSL does not support AES-192. | |
| 27 if (key_size_in_bits != 128 && key_size_in_bits != 256) | |
| 28 return NULL; | |
| 29 | |
| 30 ScopedPK11Slot slot(PK11_GetInternalSlot()); | |
| 31 if (!slot.get()) | |
| 32 return NULL; | |
| 33 | |
| 34 PK11SymKey* sym_key = PK11_KeyGen(slot.get(), CKM_AES_KEY_GEN, NULL, | |
| 35 key_size_in_bits / 8, NULL); | |
| 36 if (!sym_key) | |
| 37 return NULL; | |
| 38 | |
| 39 return new SymmetricKey(sym_key); | |
| 40 } | |
| 41 | |
| 42 // static | |
| 43 SymmetricKey* SymmetricKey::DeriveKeyFromPassword(Algorithm algorithm, | |
| 44 const std::string& password, | |
| 45 const std::string& salt, | |
| 46 size_t iterations, | |
| 47 size_t key_size_in_bits) { | |
| 48 EnsureNSSInit(); | |
| 49 if (salt.empty() || iterations == 0 || key_size_in_bits == 0) | |
| 50 return NULL; | |
| 51 | |
| 52 if (algorithm == AES) { | |
| 53 // Whitelist supported key sizes to avoid accidentaly relying on | |
| 54 // algorithms available in NSS but not BoringSSL and vice | |
| 55 // versa. Note that BoringSSL does not support AES-192. | |
| 56 if (key_size_in_bits != 128 && key_size_in_bits != 256) | |
| 57 return NULL; | |
| 58 } | |
| 59 | |
| 60 SECItem password_item; | |
| 61 password_item.type = siBuffer; | |
| 62 password_item.data = reinterpret_cast<unsigned char*>( | |
| 63 const_cast<char *>(password.data())); | |
| 64 password_item.len = password.size(); | |
| 65 | |
| 66 SECItem salt_item; | |
| 67 salt_item.type = siBuffer; | |
| 68 salt_item.data = reinterpret_cast<unsigned char*>( | |
| 69 const_cast<char *>(salt.data())); | |
| 70 salt_item.len = salt.size(); | |
| 71 | |
| 72 SECOidTag cipher_algorithm = | |
| 73 algorithm == AES ? SEC_OID_AES_256_CBC : SEC_OID_HMAC_SHA1; | |
| 74 ScopedSECAlgorithmID alg_id(PK11_CreatePBEV2AlgorithmID(SEC_OID_PKCS5_PBKDF2, | |
| 75 cipher_algorithm, | |
| 76 SEC_OID_HMAC_SHA1, | |
| 77 key_size_in_bits / 8, | |
| 78 iterations, | |
| 79 &salt_item)); | |
| 80 if (!alg_id.get()) | |
| 81 return NULL; | |
| 82 | |
| 83 ScopedPK11Slot slot(PK11_GetInternalSlot()); | |
| 84 if (!slot.get()) | |
| 85 return NULL; | |
| 86 | |
| 87 PK11SymKey* sym_key = PK11_PBEKeyGen(slot.get(), alg_id.get(), &password_item, | |
| 88 PR_FALSE, NULL); | |
| 89 if (!sym_key) | |
| 90 return NULL; | |
| 91 | |
| 92 return new SymmetricKey(sym_key); | |
| 93 } | |
| 94 | |
| 95 // static | |
| 96 SymmetricKey* SymmetricKey::Import(Algorithm algorithm, | |
| 97 const std::string& raw_key) { | |
| 98 EnsureNSSInit(); | |
| 99 | |
| 100 if (algorithm == AES) { | |
| 101 // Whitelist supported key sizes to avoid accidentaly relying on | |
| 102 // algorithms available in NSS but not BoringSSL and vice | |
| 103 // versa. Note that BoringSSL does not support AES-192. | |
| 104 if (raw_key.size() != 128/8 && raw_key.size() != 256/8) | |
| 105 return NULL; | |
| 106 } | |
| 107 | |
| 108 CK_MECHANISM_TYPE cipher = | |
| 109 algorithm == AES ? CKM_AES_CBC : CKM_SHA_1_HMAC; | |
| 110 | |
| 111 SECItem key_item; | |
| 112 key_item.type = siBuffer; | |
| 113 key_item.data = reinterpret_cast<unsigned char*>( | |
| 114 const_cast<char *>(raw_key.data())); | |
| 115 key_item.len = raw_key.size(); | |
| 116 | |
| 117 ScopedPK11Slot slot(PK11_GetInternalSlot()); | |
| 118 if (!slot.get()) | |
| 119 return NULL; | |
| 120 | |
| 121 // The exact value of the |origin| argument doesn't matter to NSS as long as | |
| 122 // it's not PK11_OriginFortezzaHack, so we pass PK11_OriginUnwrap as a | |
| 123 // placeholder. | |
| 124 PK11SymKey* sym_key = PK11_ImportSymKey(slot.get(), cipher, PK11_OriginUnwrap, | |
| 125 CKA_ENCRYPT, &key_item, NULL); | |
| 126 if (!sym_key) | |
| 127 return NULL; | |
| 128 | |
| 129 return new SymmetricKey(sym_key); | |
| 130 } | |
| 131 | |
| 132 bool SymmetricKey::GetRawKey(std::string* raw_key) { | |
| 133 SECStatus rv = PK11_ExtractKeyValue(key_.get()); | |
| 134 if (SECSuccess != rv) | |
| 135 return false; | |
| 136 | |
| 137 SECItem* key_item = PK11_GetKeyData(key_.get()); | |
| 138 if (!key_item) | |
| 139 return false; | |
| 140 | |
| 141 raw_key->assign(reinterpret_cast<char*>(key_item->data), key_item->len); | |
| 142 return true; | |
| 143 } | |
| 144 | |
| 145 SymmetricKey::SymmetricKey(PK11SymKey* key) : key_(key) { | |
| 146 DCHECK(key); | |
| 147 } | |
| 148 | |
| 149 } // namespace crypto | |
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Chromium Code Reviews
Issue 956613002:
Reland "Cut down /crypto and switch what is left of it to boringssl". (Closed)
Base URL: git@github.com:domokit/mojo.git@master