我需要使用PBEWithMD5AndDES JAVA加密方法加密和解密我的密码PBEWithMD5AndDES ，JAVA PBEWithMD5AndDES ，我需要在swift中进行加密和解密，类似于下面的代码
@implementation CryptoHelper
#pragma mark -
#pragma mark Init Methods
- (id)init
{
if(self = [super init])
{
}
return self;
}
#pragma mark -
#pragma mark String Specific Methods
/**
* Encrypts a string for social blast service.
*
* @param plainString The string to encrypt;
*
* @return NSString The encrypted string.
*/
- (NSString *)encryptString: (NSString *) plainString{
// Convert string to data and encrypt
NSData *data = [self encryptPBEWithMD5AndDESData:[plainString dataUsingEncoding:NSUTF8StringEncoding] password:@"1111"];
// Get encrypted string from data
return [data base64EncodingWithLineLength:1024];
}
/**
* Descrypts a string from social blast service.
*
* @param plainString The string to decrypt;
*
* @return NSString The decrypted string.
*/
- (NSString *)decryptString: (NSString *) encryptedString{
// decrypt the data
NSData * data = [self decryptPBEWithMD5AndDESData:[NSData dataWithBase64EncodedString:encryptedString] password:@"1111"];
// extract and return string
return [NSString stringWithUTF8String:[data bytes]];
}
#pragma mark -
#pragma mark Crypto Methods
- (NSData *)encryptPBEWithMD5AndDESData:(NSData *)inData password:(NSString *)password {
return [self encodePBEWithMD5AndDESData:inData password:password direction:1];
}
- (NSData *)decryptPBEWithMD5AndDESData:(NSData *)inData password:(NSString *)password {
return [self encodePBEWithMD5AndDESData:inData password:password direction:0];
}
- (NSData *)encodePBEWithMD5AndDESData:(NSData *)inData password:(NSString *)password direction:(int)direction
{
NSLog(@"helper data = %@", inData);
static const char gSalt[] =
{
(unsigned char)0xAA, (unsigned char)0xAA, (unsigned char)0xAA, (unsigned char)0xAA,
(unsigned char)0xAA, (unsigned char)0xAA, (unsigned char)0xAA, (unsigned char)0xAA,
(unsigned char)0x00
};
unsigned char *salt = (unsigned char *)gSalt;
int saltLen = strlen(gSalt);
int iterations = 15;
EVP_CIPHER_CTX cipherCtx;
unsigned char *mResults; // allocated storage of results
int mResultsLen = 0;
const char *cPassword = [password UTF8String];
unsigned char *mData = (unsigned char *)[inData bytes];
int mDataLen = [inData length];
SSLeay_add_all_algorithms();
X509_ALGOR *algorithm = PKCS5_pbe_set(NID_pbeWithMD5AndDES_CBC,
iterations, salt, saltLen);
memset(&cipherCtx, 0, sizeof(cipherCtx));
if (algorithm != NULL)
{
EVP_CIPHER_CTX_init(&(cipherCtx));
if (EVP_PBE_CipherInit(algorithm->algorithm, cPassword, strlen(cPassword),
algorithm->parameter, &(cipherCtx), direction))
{
EVP_CIPHER_CTX_set_padding(&cipherCtx, 1);
int blockSize = EVP_CIPHER_CTX_block_size(&cipherCtx);
int allocLen = mDataLen + blockSize + 1; // plus 1 for null terminator on decrypt
mResults = (unsigned char *)OPENSSL_malloc(allocLen);
unsigned char *in_bytes = mData;
int inLen = mDataLen;
unsigned char *out_bytes = mResults;
int outLen = 0;
int outLenPart1 = 0;
if (EVP_CipherUpdate(&(cipherCtx), out_bytes, &outLenPart1, in_bytes, inLen))
{
out_bytes += outLenPart1;
int outLenPart2 = 0;
if (EVP_CipherFinal(&(cipherCtx), out_bytes, &outLenPart2))
{
outLen += outLenPart1 + outLenPart2;
mResults[outLen] = 0;
mResultsLen = outLen;
}
} else {
unsigned long err = ERR_get_error();
ERR_load_crypto_strings();
ERR_load_ERR_strings();
char errbuff[256];
errbuff[0] = 0;
ERR_error_string_n(err, errbuff, sizeof(errbuff));
NSLog(@"OpenSLL ERROR:\n\tlib:%s\n\tfunction:%s\n\treason:%s\n",
ERR_lib_error_string(err),
ERR_func_error_string(err),
ERR_reason_error_string(err));
ERR_free_strings();
}
NSData *encryptedData = [NSData dataWithBytes:mResults length:mResultsLen]; //(NSData *)encr_buf;
//NSLog(@"encryption result: %@\n", [encryptedData base64EncodingWithLineLength:1024]);
EVP_cleanup();
return encryptedData;
}
}
EVP_cleanup();
return nil;
}
@end
答案 0 :(得分：2)
PBEWithMD5AndDES表示使用密钥派生函数（如PBKDF2（基于密码的密钥派生函数））使用MD5（消息摘要）哈希函数和DES（数据加密标准）的加密方法来加密某些数据。
使用Common Crypto可以在iOS中使用Swift轻松完成。
但这一切都相当陈旧，今天的最佳实践将使用PBBKDF2代替DES代替MD5和AES。 MD5和DES非常周，不应该用于新工作。
如果您不需要与现有加密文件进行互操作，则可以使用RNCryptor。另请参阅Using RNCryptor Swift
如果需要互操作，可以使用Common Crypto将匹配方案拼凑在一起。如果您需要这样做，请在问题中添加更多详细信息，包括示例现有代码和所有输入和输出的十六进制转储以及输入参数和Swift尝试代码。
基于密码的密钥派生2（Swift 3 +）
基于密码的密钥派生既可用于从密码文本中导出加密密钥，也可用于保存密码以进行身份验证。
可以使用几种哈希算法，包括SHA1，SHA256，SHA512，这些算法由此示例代码提供。
rounds参数用于使计算变慢，以便攻击者必须在每次尝试上花费大量时间。典型的延迟值在100ms到500ms之间，如果有不可接受的性能，可以使用更短的值。
此示例需要Common Crypto
项目必须有一个桥接标题：
#import <CommonCrypto/CommonCrypto.h>
将Security.framework添加到项目中。
参数：
password password String
salt salt Data
keyByteCount number of key bytes to generate
rounds Iteration rounds
returns Derived key
func pbkdf2SHA1(password: String, salt: Data, keyByteCount: Int, rounds: Int) -> Data? {
return pbkdf2(hash:CCPBKDFAlgorithm(kCCPRFHmacAlgSHA1), password:password, salt:salt, keyByteCount:keyByteCount, rounds:rounds)
}
func pbkdf2SHA256(password: String, salt: Data, keyByteCount: Int, rounds: Int) -> Data? {
return pbkdf2(hash:CCPBKDFAlgorithm(kCCPRFHmacAlgSHA256), password:password, salt:salt, keyByteCount:keyByteCount, rounds:rounds)
}
func pbkdf2SHA512(password: String, salt: Data, keyByteCount: Int, rounds: Int) -> Data? {
return pbkdf2(hash:CCPBKDFAlgorithm(kCCPRFHmacAlgSHA512), password:password, salt:salt, keyByteCount:keyByteCount, rounds:rounds)
}
func pbkdf2(hash :CCPBKDFAlgorithm, password: String, salt: Data, keyByteCount: Int, rounds: Int) -> Data? {
let passwordData = password.data(using:String.Encoding.utf8)!
var derivedKeyData = Data(repeating:0, count:keyByteCount)
let derivationStatus = derivedKeyData.withUnsafeMutableBytes {derivedKeyBytes in
salt.withUnsafeBytes { saltBytes in
CCKeyDerivationPBKDF(
CCPBKDFAlgorithm(kCCPBKDF2),
password, passwordData.count,
saltBytes, salt.count,
hash,
UInt32(rounds),
derivedKeyBytes, derivedKeyData.count)
}
}
if (derivationStatus != 0) {
print("Error: \(derivationStatus)")
return nil;
}
return derivedKeyData
}
使用示例：
let password = "password"
//let salt = "saltData".data(using: String.Encoding.utf8)!
let salt = Data(bytes: [0x73, 0x61, 0x6c, 0x74, 0x44, 0x61, 0x74, 0x61])
let keyByteCount = 16
let rounds = 100000
let derivedKey = pbkdf2SHA1(password:password, salt:salt, keyByteCount:keyByteCount, rounds:rounds)
print("derivedKey (SHA1): \(derivedKey! as NSData)")
示例输出：
derivedKey (SHA1): <6b9d4fa3 0385d128 f6d196ee 3f1d6dbf>
CBC模式下的AES加密，随机IV（Swift 3 +）
iv以加密数据为前缀
aesCBC128Encrypt将创建一个随机IV，并以加密代码为前缀
aesCBC128Decrypt将在解密期间使用带前缀的IV。
输入是数据，键是数据对象。如果需要的编码形式（如Base64）在调用方法中转换为和/或来自
密钥长度应为128位（16字节），192位（24字节）或256位（32字节）。如果使用其他密钥大小，则会抛出错误。
PKCS#7 padding默认设置。
此示例需要Common Crypto
项目必须有一个桥接标题：
#import <CommonCrypto/CommonCrypto.h>
将Security.framework添加到项目中。
这是示例，而非生产代码。
enum AESError: Error {
case KeyError((String, Int))
case IVError((String, Int))
case CryptorError((String, Int))
}
// The iv is prefixed to the encrypted data
func aesCBCEncrypt(data:Data, keyData:Data) throws -> Data {
let keyLength = keyData.count
let validKeyLengths = [kCCKeySizeAES128, kCCKeySizeAES192, kCCKeySizeAES256]
if (validKeyLengths.contains(keyLength) == false) {
throw AESError.KeyError(("Invalid key length", keyLength))
}
let ivSize = kCCBlockSizeAES128;
let cryptLength = size_t(ivSize + data.count + kCCBlockSizeAES128)
var cryptData = Data(count:cryptLength)
let status = cryptData.withUnsafeMutableBytes {ivBytes in
SecRandomCopyBytes(kSecRandomDefault, kCCBlockSizeAES128, ivBytes)
}
if (status != 0) {
throw AESError.IVError(("IV generation failed", Int(status)))
}
var numBytesEncrypted :size_t = 0
let options = CCOptions(kCCOptionPKCS7Padding)
let cryptStatus = cryptData.withUnsafeMutableBytes {cryptBytes in
data.withUnsafeBytes {dataBytes in
keyData.withUnsafeBytes {keyBytes in
CCCrypt(CCOperation(kCCEncrypt),
CCAlgorithm(kCCAlgorithmAES),
options,
keyBytes, keyLength,
cryptBytes,
dataBytes, data.count,
cryptBytes+kCCBlockSizeAES128, cryptLength,
&numBytesEncrypted)
}
}
}
if UInt32(cryptStatus) == UInt32(kCCSuccess) {
cryptData.count = numBytesEncrypted + ivSize
}
else {
throw AESError.CryptorError(("Encryption failed", Int(cryptStatus)))
}
return cryptData;
}
// The iv is prefixed to the encrypted data
func aesCBCDecrypt(data:Data, keyData:Data) throws -> Data? {
let keyLength = keyData.count
let validKeyLengths = [kCCKeySizeAES128, kCCKeySizeAES192, kCCKeySizeAES256]
if (validKeyLengths.contains(keyLength) == false) {
throw AESError.KeyError(("Invalid key length", keyLength))
}
let ivSize = kCCBlockSizeAES128;
let clearLength = size_t(data.count - ivSize)
var clearData = Data(count:clearLength)
var numBytesDecrypted :size_t = 0
let options = CCOptions(kCCOptionPKCS7Padding)
let cryptStatus = clearData.withUnsafeMutableBytes {cryptBytes in
data.withUnsafeBytes {dataBytes in
keyData.withUnsafeBytes {keyBytes in
CCCrypt(CCOperation(kCCDecrypt),
CCAlgorithm(kCCAlgorithmAES128),
options,
keyBytes, keyLength,
dataBytes,
dataBytes+kCCBlockSizeAES128, clearLength,
cryptBytes, clearLength,
&numBytesDecrypted)
}
}
}
if UInt32(cryptStatus) == UInt32(kCCSuccess) {
clearData.count = numBytesDecrypted
}
else {
throw AESError.CryptorError(("Decryption failed", Int(cryptStatus)))
}
return clearData;
}
使用示例：
let clearData = "clearData0123456".data(using:String.Encoding.utf8)!
let keyData = "keyData890123456".data(using:String.Encoding.utf8)!
print("clearData: \(clearData as NSData)")
print("keyData: \(keyData as NSData)")
var cryptData :Data?
do {
cryptData = try aesCBCEncrypt(data:clearData, keyData:keyData)
print("cryptData: \(cryptData! as NSData)")
}
catch (let status) {
print("Error aesCBCEncrypt: \(status)")
}
let decryptData :Data?
do {
let decryptData = try aesCBCDecrypt(data:cryptData!, keyData:keyData)
print("decryptData: \(decryptData! as NSData)")
}
catch (let status) {
print("Error aesCBCDecrypt: \(status)")
}
示例输出：
clearData: <636c6561 72446174 61303132 33343536>
keyData: <6b657944 61746138 39303132 33343536>
cryptData: <92c57393 f454d959 5a4d158f 6e1cd3e7 77986ee9 b2970f49 2bafcf1a 8ee9d51a bde49c31 d7780256 71837a61 60fa4be0>
decryptData: <636c6561 72446174 61303132 33343536>
注意：
CBC模式示例代码的一个典型问题是它将随机IV的创建和共享留给用户。此示例包括生成IV，加密数据前缀并在解密期间使用前缀IV。这使临时用户免于CBC mode所需的详细信息。
为了安全起见，加密数据也应该具有身份验证，这个示例代码不会提供这样的代码，因为它很小并且可以为其他平台提供更好的互操作性。
同样缺少密钥的密钥派生密钥，建议使用PBKDF2文本密码作为密钥材料使用。
对于强大的生产就绪的多平台加密代码，请参阅RNCryptor。