Swift generated RSA public and private key pairs does not compatible with other platforms

Question

Anuradh OP

Created Aug ’17

Replies 1

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I'm createing RSA public and private key pairs like below.

var statusCode: OSStatus
        var publicKey: SecKey?
        var privateKey: SecKey?
   
        let publicKeyAttribute: [NSObject : NSObject] = [kSecAttrIsPermanent: true as NSObject, kSecAttrApplicationTag: "com.anu.keys.apppublic".data(using: String.Encoding.utf8)! as NSObject]
   
        let privateKeyAtrribute: [NSObject: NSObject] = [kSecAttrIsPermanent: true as NSObject, kSecAttrApplicationTag: "com.anu.keys.appprivate".data(using: String.Encoding.utf8)! as NSObject]
   
        var keyPairAttr = [NSObject: Any]()
        keyPairAttr[kSecAttrType] = kSecAttrKeyTypeRSA
        keyPairAttr[kSecAttrKeySizeInBits] = 2048
        keyPairAttr[kSecReturnData] = true
        keyPairAttr[kSecPublicKeyAttrs] = publicKeyAttribute
        keyPairAttr[kSecPrivateKeyAttrs] = privateKeyAtrribute
  
   
        statusCode = SecKeyGeneratePair(keyPairAttr as CFDictionary, &publicKey, &privateKey)

This generates two keys properly and keys are like below,

public key

<SecKeyRef algorithm id: 1, key type: RSAPublicKey, version: 4, block size: 2048 bits, exponent: {hex: 10001, decimal: 65537}, modulus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addr: 0x608000420e80>

private key

<SecKeyRef algorithm id: 1, key type: RSAPrivateKey, version: 4, block size: 2048 bits, addr: 0x60000003b960>

But I cannot use those keys with any other platforms such as .net or android. it says invalid key format. in android the key can see like below,

***** key

Private key

why is this. why ios(Apple) cannot provide standard public/private keys that can use with rest APIs and with other platforms. I don't want to use any third party libraries. hope your help with this.

Boost

Answer 1

DTS Engineer OP

Apple

Aug ’17

I answered this over in your other thread.

ps Creating multiple threads for the same question is more likely to annoy people than it is to get you extra help. My recommendation is that you post once in the most appropriate topic area and then, if you don’t get an answer after a few days, post again somewhere else (referencing the old thread so that folks can tie everything together).

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