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Preetam Jadakar
Preetam Jadakar

Reputation: 4561

`SecKey` object creation for RSA failing, Error Domain Code=-50 "RSA private key creation from data failed swift-iOS

I'm not able to create SecKey object from below private key, I did try many answers available here but nothing is helping.

My swift piece of code is as below:

    var error: Unmanaged<CFError>?

    guard let keyData = Data(base64Encoded: key) else {
        return nil
    }

    var keyAttributes: CFDictionary {
        return [kSecAttrKeyType: kSecAttrKeyTypeRSA,
                kSecAttrKeyClass: kSecAttrKeyClassPrivate,
                kSecAttrKeySizeInBits: keySize] as CFDictionary
    }

    guard let secKey = SecKeyCreateWithData(keyData as CFData, keyAttributes, &error) else {
        print(error.debugDescription) //Error Domain Code=-50 "RSA private key creation from data failed swift-iOS
        return nil
    }

The expected result is secKey should have valid value and above guard should not fail.

Note: Public key conversion to the respective secKey is working perfectly fine (the problem is with the only private key while decryption). I have tried removing \r\n from the above key.

Upvotes: 2

Views: 3855

Answers (1)

Preetam Jadakar
Preetam Jadakar

Reputation: 4561

After searching a lot, found this Apple thread helpful. I'm able to manage this ASN.1 parsing using SwiftyRSA library.

    let privateKeySwifty = try PrivateKey(pemEncoded: privateKey)

    let secPrivateKey = try PrivateKey(reference: privateKeySwifty.reference)

After digging deeper, I can see, there was a need to stripe the header of keyData (ASN.1 Parsing).

Upvotes: 2

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