RSA decryption with openSSL - iphone

Question

I have a problem with RSA encrypted and Base 64 encoded text decryption. When i decrypt directly encrypted text(unsigned char *) then everything is okay and I get correct result. But when I do base64 encoding, than openssl fails to decrypt data, although base64 decoded data is exactly same as was encrypted data:
For example(first is encryption result and second base 64 decoding result. Decoding first char * directly works pretty well.)
encrypted - ßÁ¨£®Òz>Ô‹n.€Ö∫BÔ–∂ü∏ÕD⁄UÖáµ)ûKufi wÆ&_è”eëõ~gK∂¶$kŸƒ∫ª`ÔfΩ˙˛{∆_MªÔëbP Q¶fl±Ü;!ü•◊s>ħ∆◊⁄≤ò˙ˇCWôVÂzôzíö≤ÙU¶?⁄l[*H?o\ñ>ƒ<‘4mœ“Lr
Íhh
decoded string - ßÁ¨£®Òz>Ô‹n.€Ö∫BÔ–∂ü∏ÕD⁄UÖáµ)ûKufi wÆ&_è”eëõ~gK∂¶$kŸƒ∫ª`ÔfΩ˙˛{∆_MªÔëbP Q¶fl±Ü;!ü•◊s>ħ∆◊⁄≤ò˙ˇCWôVÂzôzíö≤ÙU¶?⁄l[*H?o\ñ>ƒ<‘4mœ“Lr
Íhh
Code:
+(NSString *) rsaEncryptedStringFromText: (NSString *) text
{
const char *message = [text UTF8String];
NSLog(#"message - %s", message);
int bufSize;
NSString *keyFilePath = [[NSBundle mainBundle] pathForResource:#"publicKey" ofType:#"pem"];
FILE *keyfile = fopen([keyFilePath UTF8String], "r");
RSA *rsa = PEM_read_RSA_PUBKEY(keyfile, NULL, NULL, NULL);
if (rsa == NULL)
{
return nil;
}
int key_size = RSA_size(rsa);
unsigned char *encrypted = (unsigned char *) malloc(key_size);
bufSize = RSA_public_encrypt(strlen(message), (unsigned char *) message, encrypted, rsa, RSA_PKCS1_PADDING);
if (bufSize == -1)
{
RSA_free(rsa);
return nil;
}
NSLog(#"encrypted - %s", encrypted);
NSData *encryptedData = [NSData dataWithBytes:encrypted length:strlen((const char *)encrypted)];
NSString *base64 = [encryptedData base64Encoding];
RSA_free(rsa);
return base64;
}
+(NSString *) rsaDecryptToStringFromText: (NSString *) text
{
//NSLog(#"text - %#", text);
NSData *decodedData = [NSData dataWithBase64EncodedString: text];
unsigned char* message = (unsigned char*) [decodedData bytes];
NSLog(#"decoded string - %s", message);
RSA *privKey = NULL;
FILE *priv_key_file;
unsigned char *ptext;
NSString *keyFilePath = [[NSBundle mainBundle] pathForResource:#"privateKeyPair" ofType:#"pem"];
priv_key_file = fopen([keyFilePath UTF8String], "rb");
ERR_print_errors_fp(priv_key_file);
privKey = PEM_read_RSAPrivateKey(priv_key_file, NULL, NULL, NULL);
int key_size = RSA_size(privKey);
ptext = malloc(key_size);
int outlen = RSA_private_decrypt(key_size, (const unsigned char*)message, ptext, privKey, RSA_PKCS1_PADDING);
if(outlen < 0) return nil;
RSA_free(privKey);
return [NSString stringWithUTF8String: (const char *)ptext];
}
Base 64 encoding-decoding is done with this:
http://www.iphonedevsdk.com/forum/iphone-sdk-development/21689-base-64-string-help.html#post98080

Answer 1

Main problem was in base64 encoding+decoding class. Switched to QSutilities and everything works.