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POHow to encrypt a file in a CLI and decrypt it with iOS?
 

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  1. POHow to encrypt a file in a CLI and decrypt it with iOS?
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    <p>I have some problems decrypting a file encrypted with openssl in a bash. Below is what I did step by step. I can't figure out where does it go wrong.</p> <p>The original file (ended with newline) :</p> <pre><code>123456 abcdef ghijkl </code></pre> <p>Generate 32 bytes long random password :</p> <pre><code>$ openssl rand -hex 32 fec8950708098e9075e8b4df9a969aa7963c4d820158e965c7848dbfc8ca73ed </code></pre> <p>Encrypt the file :</p> <pre><code>$ openssl aes-128-ecb -in original.txt -out encrypted.txt </code></pre> <p>About the encrypted file :</p> <pre><code>$ file encrypted.txt encrypted.txt: Non-ISO extended-ASCII text, with CR line terminators, with overstriking $ cat encrypted.txt Salted__??\z?F?z????4G}Q? Y?{ӌ???????b*?? </code></pre> <p>Code to call the decrypt method :</p> <pre><code>NSData *myDataDec = [self aesDecrypt:@"fec8950708098e9075e8b4df9a969aa7963c4d820158e965c7848dbfc8ca73ed" data:myData]; NSLog(@"decrypted: %@", [[NSString alloc] initWithData:myDataDec encoding:NSASCIIStringEncoding]); </code></pre> <p>Method to decrypt :</p> <pre><code>- (NSData *)aesDecrypt:(NSString *)key data:(NSData *)data { // 'key' should be 32 bytes for AES256, will be null-padded otherwise char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused) bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding) // fetch key data [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; NSUInteger dataLength = [data length]; //See the doc: For block ciphers, the output size will always be less than or equal to the input size plus the size of one block. //That's why we need to add the size of one block here size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); size_t numBytesEncrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES256, NULL /* initialization vector (optional) */, [data bytes], dataLength, /* input */ buffer, bufferSize, /* output */ &amp;numBytesEncrypted); NSLog(@"cryptStatus: %d", cryptStatus); if (cryptStatus == kCCSuccess) { NSLog(@"aes success"); //the returned NSData takes ownership of the buffer and will free it on deallocation return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted]; } NSLog(@"aes error"); free(buffer); //free the buffer; return nil; } </code></pre> <p>Logs :</p> <pre><code>2012-09-01 15:08:51.331 My Project[75582:f803] cryptStatus: -4304 2012-09-01 15:08:51.332 My Project[75582:f803] aes error 2012-09-01 15:08:51.332 My Project[75582:f803] decrypted: </code></pre> <p>kCCDecodeError details :</p> <pre><code>kCCDecodeError - Input data did not decode or decrypt properly. </code></pre>
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