How to find out the modulus and exponent of RSA Public Key on iPhone/Objective C

Question

Is there a possible way to find out the modulus and exponent of the Public Key, created with SecKeyGeneratePair (the Security Framework in general)?

Answer 1

Something like the following is much more reliable:

+ (NSInteger)keyModulusSize:(NSData *)keyData
{
    NSString *randomTag = [NSString ptk_randomStringOfLength:32];
    SecKeyRef key = [self addPublicKeyRef:keyData withTag:randomTag];

    NSInteger size = 0;
    if (key) {
        size = SecKeyGetBlockSize(key);
        [self removePublicKeyRef:randomTag];
    }

    return size;
}