1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef __FWDLOCKGLUE_H__ 18 #define __FWDLOCKGLUE_H__ 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 /** 25 * Generates the specified number of cryptographically secure random bytes. 26 * 27 * @param[out] pBuffer A reference to the buffer that should receive the random data. 28 * @param[in] numBytes The number of random bytes to generate. 29 * 30 * @return A Boolean value indicating whether the operation was successful. 31 */ 32 int FwdLockGlue_GetRandomNumber(void *pBuffer, size_t numBytes); 33 34 /** 35 * Performs initialization of the key-encryption key. Should be called once during startup to 36 * facilitate encryption and decryption of session keys. 37 * 38 * @return A Boolean value indicating whether the operation was successful. 39 */ 40 int FwdLockGlue_InitializeKeyEncryption(); 41 42 /** 43 * Returns the length of the encrypted key, given the length of the plaintext key. 44 * 45 * @param[in] plaintextKeyLength The length in bytes of the plaintext key. 46 * 47 * @return The length in bytes of the encrypted key. 48 */ 49 size_t FwdLockGlue_GetEncryptedKeyLength(size_t plaintextKeyLength); 50 51 /** 52 * Encrypts the given session key using a key-encryption key unique to this device. 53 * 54 * @param[in] pPlaintextKey A reference to the buffer containing the plaintext key. 55 * @param[in] plaintextKeyLength The length in bytes of the plaintext key. 56 * @param[out] pEncryptedKey A reference to the buffer containing the encrypted key. 57 * @param[in] encryptedKeyLength The length in bytes of the encrypted key. 58 * 59 * @return A Boolean value indicating whether the operation was successful. 60 */ 61 int FwdLockGlue_EncryptKey(const void *pPlaintextKey, 62 size_t plaintextKeyLength, 63 void *pEncryptedKey, 64 size_t encryptedKeyLength); 65 66 /** 67 * Decrypts the given session key using a key-encryption key unique to this device. 68 * 69 * @param[in] pEncryptedKey A reference to the buffer containing the encrypted key. 70 * @param[in] encryptedKeyLength The length in bytes of the encrypted key. 71 * @param[out] pDecryptedKey A reference to the buffer containing the decrypted key. 72 * @param[in] decryptedKeyLength The length in bytes of the decrypted key. 73 * 74 * @return A Boolean value indicating whether the operation was successful. 75 */ 76 int FwdLockGlue_DecryptKey(const void *pEncryptedKey, 77 size_t encryptedKeyLength, 78 void *pDecryptedKey, 79 size_t decryptedKeyLength); 80 81 #ifdef __cplusplus 82 } 83 #endif 84 85 #endif // __FWDLOCKGLUE_H__ 86
