103 lines
2.9 KiB
103 lines
2.9 KiB
14 years ago
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/*
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* UBCryptoUtils.cpp
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*
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* Created on: 23 sept. 2009
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* Author: Luc
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*/
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#include "UBCryptoUtils.h"
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#include <openssl/aes.h>
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UBCryptoUtils* UBCryptoUtils::sInstance(0);
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QString UBCryptoUtils::sAESKey("9ecHaspud9uD9ste5erAchehefrup3echej-caje6&thestawacuk=h#F3jet3aF");
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QString UBCryptoUtils::sAESSalt("6f0083e0-a90c-11de-ac21-0002a5d5c51b");
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UBCryptoUtils::UBCryptoUtils(QObject * pParent)
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: QObject(pParent)
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{
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aesInit();
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}
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UBCryptoUtils::~UBCryptoUtils()
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{
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// TODO UB 4.x aes destroy
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}
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QString UBCryptoUtils::symetricEncrypt(const QString& clear)
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{
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QByteArray clearData = clear.toUtf8();
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int cipheredLength = clearData.length() + AES_BLOCK_SIZE;
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int paddingLength = 0;
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unsigned char *ciphertext = (unsigned char *)malloc(cipheredLength);
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if(!EVP_EncryptInit_ex(&mAesEncryptContext, NULL, NULL, NULL, NULL))
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return QString();
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if(!EVP_EncryptUpdate(&mAesEncryptContext, ciphertext, &cipheredLength, (unsigned char *)clearData.data(), clearData.length()))
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return QString();
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/* update ciphertext with the final remaining bytes */
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if(!EVP_EncryptFinal_ex(&mAesEncryptContext, ciphertext + cipheredLength, &paddingLength))
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return QString();
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QByteArray cipheredData((const char *)ciphertext, cipheredLength + paddingLength);
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free(ciphertext);
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return QString::fromAscii(cipheredData.toBase64());
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}
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QString UBCryptoUtils::symetricDecrypt(const QString& encrypted)
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{
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QByteArray encryptedData = QByteArray::fromBase64(encrypted.toAscii());
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int encryptedLength = encryptedData.length();
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int paddingLength = 0;
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unsigned char *plaintext = (unsigned char *)malloc(encryptedLength);
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if(!EVP_DecryptInit_ex(&mAesDecryptContext, NULL, NULL, NULL, NULL))
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return QString();
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if(!EVP_DecryptUpdate(&mAesDecryptContext, plaintext, &encryptedLength, (const unsigned char *)encryptedData.data(), encryptedData.length()))
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return QString();
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if(!EVP_DecryptFinal_ex(&mAesDecryptContext, plaintext + encryptedLength, &paddingLength))
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return QString();
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int len = encryptedLength + paddingLength;
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QByteArray clearData((const char *)plaintext, len);
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free(plaintext);
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return QString::fromUtf8(clearData);;
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}
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void UBCryptoUtils::aesInit()
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{
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int i, nrounds = 5;
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unsigned char key[32], iv[32];
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unsigned char *key_data = (unsigned char *)sAESKey.toAscii().data();
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int key_data_len = sAESKey.length();
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i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha1(), (unsigned char *)sAESSalt.toAscii().data(), key_data,
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key_data_len, nrounds, key, iv);
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if (i != 32)
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{
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qWarning() << QString("Key size is %1 bits - should be 256 bits").arg(i);
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return;
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}
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EVP_CIPHER_CTX_init(&mAesEncryptContext);
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EVP_EncryptInit_ex(&mAesEncryptContext, EVP_aes_256_cbc(), NULL, key, iv);
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EVP_CIPHER_CTX_init(&mAesDecryptContext);
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EVP_DecryptInit_ex(&mAesDecryptContext, EVP_aes_256_cbc(), NULL, key, iv);
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}
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