iPhone / OS X LION:如何从CC_SHA256加密数据中检索解码数据? [英] iPhone/OS X LION: How to retrieve the decoded data from the CC_SHA256 encrypted data?
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问题描述
我使用以下代码(CC_SHA256)编码NSString输入。有人可以帮助我使用相同的逻辑以解码格式检索吗?
I am encoding NSString input using the following code (CC_SHA256). Could someone help me retrieving in decoded format using the same logic?
-(NSString*) encodeAndGetHashInfo :(NSString *) inStringToHashIt
{
NSDate *currentDate = [NSDate date];
NSLog(@"currentDate %@",currentDate);
NSTimeInterval currTimeMillsecs = ([currentDate timeIntervalSince1970] * 1000);
NSString *strCurrTimeMilliSecs = [NSString stringWithFormat:@"%.0f", currTimeMillsecs];
NSLog(@"strCurrTimeMilliSecs: %@", strCurrTimeMilliSecs); //here we are getting millsec in this way 1328962624994.734131
//double currentTime=[strCurrTimeMilliSecs doubleValue];
//Do hashing
NSString *withSalt= [NSString stringWithFormat:@"%@%@%@", strCurrTimeMilliSecs, inStringToHashIt,STATIC_HASH];
NSLog(@"withSalt.%@",withSalt);
NSString *inputStr = withSalt;
unsigned char hashedChars[32];
CC_SHA256([inputStr UTF8String],
[inputStr lengthOfBytesUsingEncoding:NSUTF8StringEncoding],
hashedChars);
NSData * hashedData = [NSData dataWithBytes:hashedChars length:32];
NSLog (@"hashedData:%@",hashedData );
NSString* hashPasswordResponse = NULL;
hashPasswordResponse = [NSString stringWithFormat:@"%@", hashedData];
hashPasswordResponse = [hashPasswordResponse stringByReplacingOccurrencesOfString:@" " withString:@""];
NSLog(@"hashPasswordResponse.......%@",hashPasswordResponse);//this string is
return hashPasswordResponse;
}
推荐答案
正如其他人所说, SHA-1和SHA-2变体是设计单向散列。如果可以反转它们,则哈希值会被破坏。哈希用于检查数据完整性,而不是提供数据加密。
As the others have noted, SHA-1 and the SHA-2 variants are by design one-way hashes. If you can reverse them, the hashes are broken. The hashes are designed to check data integrity, not to provide data encryption.
如果你想要加密/解密而不是散列,你想要使用CommonCrypto的一个 CCCryptor
例程。请参阅:
If you want encryption/decryption as opposed to hashing, you want to use one of CommonCrypto's CCCryptor
routines. See:
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