title: iphone OS! RSA Encryption with public key generated by Bouncy Castle (Java)
body: <p>I'm developing an application on iphone. I had an application on Java using encryption (RSA) and I created a Private Key and Public Key. I want use the Public Key in Java application on iphone. For Ex: My Public Key is byte[] publicKey = {0x01,0x02};
  How can I use my publicKey to encrypt data on iphone?
  I saw CryptoExercise, but i cannot build it (function: SecKeyEncrypt err:EXC_BAD_ACCESS ). Can i use getPublicKeyBits() or getPublicKeyRef()?</p>
  
  <p>Here is my code:</p>
  
  <pre><code>* (NSData *)getPublicKeyBits {
  
  OSStatus sanityCheck = noErr;
  
  //
  const char myByteArray[] = {
  0x00, -0x79, 0x7C, 0x34,
  0x5C, -0x36, 0x36, 0x75,
  0x0E, 0x7F, -0x21, -0x05,
  0x41, 0x21, 0x4F, -0x30,
  0x2D, 0x5F, 0x08, -0x25,
  0x07, -0x08, 0x22, -0x09,
  0x32, -0x6C, 0x10, 0x1E, 0x5A,
  -0x59, -0x14, -0x55, -0x73, 0x21,
  0x5E, -0x54, -0x5E, -0x72, 0x37,
  -0x31, -0x25, -0x45, 0x3B, 0x7D, -0x3C,
  -0x6F, -0x40, -0x7E, 0x74, -0x68, -0x23,
  0x42, 0x12, -0x62, -0x66, 0x4D, 0x20, -0x69,
  0x28, -0x28, -0x36, -0x71, 0x21, 0x02, -0x32,
  -0x19, 0x66, 0x7D, 0x3E, 0x03, 0x49, -0x66, 0x1F,
  -0x38, 0x3C, 0x0A, 0x5F, 0x60, 0x1B, -0x75, 0x41, 0x48,
  -0x5F, 0x1F, -0x34, -0x31, -0x09, 0x17, 0x23, 0x11, 0x1E,
  -0x68, 0x0B, -0x4D, 0x69, -0x3F, -0x27, 0x13, -0x71, -0x6D,
  -0x7A, 0x3A, 0x64, 0x2A, 0x6A, -0x6E, 0x3C, 0x04, -0x70, -0x1C};
  
  NSData *publicKeyBits = NSData dataWithBytes: myByteArray length: sizeof(myByteArray);
  //
  //NSData * publicKeyBits = {1};
  
  NSMutableDictionary * queryPublicKey = [NSMutableDictionary alloc] init;
  
  // Set the public key query dictionary.
  queryPublicKey setObject:(id)kSecClassKey forKey:(id)kSecClass;
  queryPublicKey setObject:publicTag forKey:(id)kSecAttrApplicationTag;
  queryPublicKey setObject:(id)kSecAttrKeyTypeRSA forKey:(id)kSecAttrKeyType;
  [queryPublicKey setObject:NSNumber numberWithBool:YES] forKey:(id)kSecReturnData;
  
  // Get the key bits.
  sanityCheck = SecItemCopyMatching((CFDictionaryRef)queryPublicKey, (CFTypeRef *)&amp;publicKeyBits);
  
  if (sanityCheck != noErr)
  {
  printf("sanitycheck error@@@@@");
  publicKeyBits = nil;
  }
  
  NSLog(@"** public key bits: %s", &amp;publicKeyBits);
  
  queryPublicKey release;
  
  
  return publicKeyBits;
  }
  
  // encrypt message
  
      * (void)encryptWithPublicKey:(uint8_t *)plainBuffer cipherBuffer:(uint8_t *)cipherBuffer
  
  {
  NSLog(@"== encryptWithPublicKey()");
  NSData* publicKey= [AppController sharedWrapper] getPublicKeyBits;
  
  OSStatus status = noErr;
  
  NSLog(@"** original plain text 0: %s", plainBuffer);
  
  size_t cipherBufferSize = 1;
  uint8_t *pPlainText = (uint8_t*)"This is a test";
  uint8_t *aCipherText;
  size_t *iCipherLength = (size_t*)"1024";
  
  // Error handling
  // Encrypt using the public.
  printf("begin ecrypt !!!!");
  // status = SecKeyEncrypt(publicKey,
  // kSecPaddingNone,
  // plainBuffer,
  // plainBufferSize,
  // &amp;cipherBuffer[0],
  // &amp;cipherBufferSize
  // );
  
  status = SecKeyEncrypt(publicKey,
  kSecPaddingNone,
  pPlainText,
  strlen( (char*)pPlainText) + 1,
  aCipherText,
  iCipherLength);
  printf("end encrypt !!!!");
  NSLog(@"encryption result code: %d (size: %d)", status, cipherBufferSize);
  NSLog(@"encrypted text: %s", cipherBuffer);
  }
  </code></pre>
  
  <p>Please Help me!
  Thank you very much</p>