RSA加密 解密报错

网上有现成代码？######给你发一个DES的，你发发，应该就可以当RSA的了吧

#import "DESOpr.h"
#import "GTMBase64.h"

@implementation DESOpr
static Byte iv[] = {1,2,3,4,5,6,7,8};
+(NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key
{
    NSString *ciphertext = nil;
    const char *textBytes = [plainText UTF8String];
    NSUInteger dataLength = [plainText length];
    unsigned char buffer[1024];
    memset(buffer, 0, sizeof(char));
    size_t numBytesEncrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,
                                          kCCOptionPKCS7Padding,
                                          [key UTF8String], kCCKeySizeDES,
                                          iv,
                                          textBytes, dataLength,
                                          buffer, 1024,
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {
        NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
        data = [GTMBase64 encodeData:data];  //base64加密
        ciphertext = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    }
    return ciphertext;
}

+(NSString *) decryptUseDES:(NSString *)plainText key:(NSString *)key
{
    NSString *ciphertext = nil;
    const char *textBytes = [plainText UTF8String];
    NSUInteger dataLength = [plainText length];
    unsigned char buffer[1024];
    memset(buffer, 0, sizeof(char));
    size_t numBytesEncrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES,
                                          kCCOptionPKCS7Padding,
                                          [key UTF8String], kCCKeySizeDES,
                                          iv,
                                          textBytes, dataLength,
                                          buffer, 1024,
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {
        NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
        data = [GTMBase64 encodeData:data];  //base64加密
        ciphertext = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    }
    return ciphertext;
}



@end 

######只在本地加解密？可以用OpenSSL。如果和服务器互相通讯，也用OpenSSL吧～ 上面那个DES的，对RSA没有任何参考意义。