Signing token with ECC encryption certificate
来源： https://stackoverflow.com/questions/60994403/signing-token-with-ecc-encryption-certificate
ecdh
ECDH with key in Android Key Store
问题 I'm developping an Android App that generates an EC Asymetric key. When my app gets connected to a device, they exchange their public key. They then use ECDH to establish a shared secret. This shared secret is then used to derive an AES session key. All this is working fine. I'm now working on the storage of the asymetric key. I wanted to put it in the Android KeyStore but I don't see how I can then do the ECDH operation. The key in the key store can be used to sign, decrypt or encrypt but I
SecKeyCopyKeyExchangeResult() function return an error, “kSecKeyKeyExchangeParameterRequestedSize is missing”
问题 I'm using Xcode11 Beta as IDE and Swift. Below is my code, my code can work well on Xcode10.3, but it can't work on Xcode11. When I call the function SecKeyCopyKeyExchangeResult(), the stack always return an error, "kSecKeyKeyExchangeParameterRequestedSize is missing", but it's okay on Xcode10.3. I checked Apple Developer portal, haven't any clue on it. ` func main() { testECDH() } private func testECDH(){ generateKeyPair() let alicePublicKey = getPublicKey() let alicePrivateKey =
How do I get ECDH keypair in Android 9.0 pie?
问题 I want to get ECDH keypair (Public key and Private key). This method is not working in Android 9.0 pie, because Security provider "BC" , "SC" is removed from this version. I tried below method KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC", "BC"); SecureRandom random = SecureRandom.getInstance("SHA1PRNG"); keyGen.initialize(256, random); KeyFactory kaif = KeyFactory.getInstance("EC", "BC"); KeyPair pair = keyGen.generateKeyPair(); PrivateKey privateKey = pair.getPrivate();
Protection of an ECC Key in an Android Application
问题 I have done an Android Application using an ECC Key pair. When I have developed it last year, I wanted to create the ECC key in the Android Keystore. Unfortunately, this ECC key is used to generate a session key thanks to ECDH, and ECDH is not supported by Android Keystore (this is what I have been said here: ECDH with key in Android Key Store ) I have followed the recommendations: I have created an AES key in the Android KeyStore and I have used it to encrypt the ECC key before storing it in
What should the length of public key on ECDH be?
问题 I am working on a project. Implemented ECDH with C++(Botan library) now I am trying to implement ECDH on Android app and I will try to connect Android to Windows and will check if the shared secret keys are identical. My problem is related to Java implementation, it generates a longer public key than I expected. As far as I know or learn from here, If it is a 256-bit curve (secp256k1), keys will be: Public: 32 bytes * 2 + 1 = 65 (uncompressed) Private: 32 bytes // Generate ephemeral ECDH
How to import a bitcoin private key to BigInteger?
问题 I use the following codes to try to import a bitcoin private key and compute the public key. The computed ECPublicKey is not equal to bitcoinPublicKey. How to correct? string bitcoinPrivateKeyStr = "cVnb9S9GgHxsBxfaApvGnWvfwqXRYdV8f1Q2CkQeBa4EsWTNmsGS"; BitcoinSecret bs = new BitcoinSecret(bitcoinPrivateKeyStr); byte[] bitcoinPrivateKeyBytes = bs.PrivateKey.ToBytes(); byte[] bitcoinPublicKeybytes = bs.PubKey.Decompress().ToBytes(); X9ECParameters curve = SecNamedCurves.GetByName("secp256k1");
ECDiffieHellmanPublicKey from ByteArray (using ECDiffieHellman NamedCurves)
问题 I'm working on communication nodejs -> c# server. I need to secure connection between them so I chode ECDiffieHellman as the key exchange mechanism (nodejs supports it). I had some problem with it... Just my lack of knowledge so I've made my lesson and now I can generate and export keys as base64 and nodejs have no problem with accepting c# key but on the other side c# ... won't even take his own key ... error System.Security.Cryptography.CryptographicException: 'The parameter is incorrect.'
Encryption in swift using Diffie Hellman key exchange and an elliptic curve encryption
问题 I've been trying to encrypt and decrypt a string in swift using a Diffie Hellman key exchange and an elliptic curve encryption. Following is the code that I followed. SWIFT Code : let attributes: [String: Any] = [kSecAttrKeySizeInBits as String: 256, kSecAttrKeyType as String: kSecAttrKeyTypeEC, kSecPrivateKeyAttrs as String: [kSecAttrIsPermanent as String: false]] var error: Unmanaged<CFError>? if #available(iOS 10.0, *) { **// Step 1: Generating the Public & Private Key** guard let
ECDH with key in Android Key Store
I'm developping an Android App that generates an EC Asymetric key. When my app gets connected to a device, they exchange their public key. They then use ECDH to establish a shared secret. This shared secret is then used to derive an AES session key. All this is working fine. I'm now working on the storage of the asymetric key. I wanted to put it in the Android KeyStore but I don't see how I can then do the ECDH operation. The key in the key store can be used to sign, decrypt or encrypt but I don't see the possibility to do ECDH operation. Is it possible? While browsing SO, I have seen this