OpenSSL publicly written objective-c encryption
So I solved my problem, here is the function of my question that encrypts the NSString:
I changed the code from the code in this question: Send RSA public key to iphone and use it for encryption
(Also at the end of my code I am using QSUtilities to base64 encode the message)
#pragma mark Encryption using OpenSSL
+ (NSString *)EncryptMessage:(NSString *)message {
NSString *path = [[NSBundle mainBundle] pathForResource:@"pubkey" ofType:@"pem"];
FILE *pubkey = fopen([path cStringUsingEncoding:1], "r");
if (pubkey == NULL) {
NSLog(@"duh: %@", [path stringByAppendingString:@" not found"]);
return NULL;
}
RSA *rsa = PEM_read_RSA_PUBKEY(pubkey, NULL, NULL, NULL);
if (rsa == NULL) {
NSLog(@"Error reading RSA public key.");
return NULL;
}
const char *msgInChar = [message UTF8String];
unsigned char *encrypted = (unsigned char *) malloc(512); //I'm not so sure about this size
int bufferSize = RSA_public_encrypt(strlen(msgInChar), (unsigned char *)msgInChar, encrypted, rsa, RSA_PKCS1_PADDING);
if (bufferSize == -1) {
NSLog(@"Encryption failed");
return NULL;
}
NSData *data = [NSData dataWithBytes:(const void *)encrypted length:512]; //I'm not so sure about this length
NSString *result = [QSStrings encodeBase64WithData:data];
free(rsa);
fclose(pubkey);
free(encrypted);
return result;
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Hi i had the same problem, finally i found what i was looking for. What I need, as CodeInChaos, is my self-signed certificate. My code works fine with it. For this I use this command:
openssl req -x509 -out public_key.der -outform der -new -newkey rsa:1024 -keyout private_key.pem -days 3650
I found this post very helpful:
http://blog.iamzsx.me/show.html?id=155002
Answers many questions. Not in English, but google translated so this is not a big problem.
I made this little function to encrypt data with the code I found and my own. I have a public key in my package and I am returning a base64 encoded NSDaa message to send to the server:
+ (NSString *)encryptWithPublicKeyMessage:(NSString *) message
{
NSLog(@"encrypting...");
NSData *inputData = [message dataUsingEncoding:NSUTF8StringEncoding];
const void *bytes = [inputData bytes];
int length = [inputData length];
uint8_t *plainText = malloc(length);
memcpy(plainText, bytes, length);
/* Open and parse the cert*/
NSData *certData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"public_key" ofType:@"der"]];
SecCertificateRef cert = SecCertificateCreateWithData(kCFAllocatorDefault, (__bridge CFDataRef)certData);
SecPolicyRef policy = SecPolicyCreateBasicX509();
SecTrustRef trust;
OSStatus status = SecTrustCreateWithCertificates(cert, policy, &trust);
/* You can ignore the SecTrustResultType, but you have to run SecTrustEvaluate
* before you can get the public key */
SecTrustResultType trustResult;
if (status == noErr) {
status = SecTrustEvaluate(trust, &trustResult);
}
/* Now grab the public key from the cert */
SecKeyRef publicKey = SecTrustCopyPublicKey(trust);
/* allocate a buffer to hold the cipher text */
size_t cipherBufferSize;
uint8_t *cipherBuffer;
cipherBufferSize = SecKeyGetBlockSize(publicKey);
cipherBuffer = malloc(cipherBufferSize);
/* encrypt!! */
SecKeyEncrypt(publicKey, kSecPaddingPKCS1, plainText, length, cipherBuffer, &cipherBufferSize);
NSData *d = [NSData dataWithBytes:cipherBuffer length:cipherBufferSize];
/* Free the Security Framework Five! */
CFRelease(cert);
CFRelease(policy);
CFRelease(trust);
CFRelease(publicKey);
free(cipherBuffer);
NSLog(@"encrypted");
return [d encodeBase64ForData];
}
I hope this helps me, it takes me a while to find the correct code
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