CommonCrypto issue on ios

Hi,

I am having few issues with commoncrypto api. I am using commoncrypto api for aes-ctr encryption/decryption. I am creating a commoncrypto object with the below code

CCCryptorStatus status = CCCryptorCreateWithMode(kCCDecrypt, kCCModeCTR, kCCAlgorithmAES128, ccNoPadding,

iv->bytes, key->bytes, key->len, NULL, 0, 0, kCCModeOptionCTR_BE, &cryptor);

then

status = CCCryptorUpdate(cryptor, inputData, len, ptr,remainingBytes,&movedBytes);

ptr += movedBytes;

remainingBytes -= movedBytes;

totalBytesWritten += movedBytes;

status = CCCryptorFinal(cryptor,

ptr,

remainingBytes,

&movedBytes

);

Initially I had few memory issues with my code, to resolve those issue I have enabeld " Guard malloc", "Enable Scribble", "Enable Guard Edges". With these setting enabled my app is working as expected on the simulator, however when I disable the above setting, Encryption and decryption are not working as expected.

Any ideas what I am I missing here?