elliptic-curve

I have created key pairs for elliptic curve DSA signatures using BouncyCastle and managed to import the public key into ECDsaCng using an XMLString accoding to RFC4050 . Now I want to also move the private key and have not managed to find a solution. The closest I have got is using CngKey.Import. CngKey.Import supports PKCS#8 format so if you can get your keys into valid pkcs8 then it should work. Unfortunately the following code does not quite work. var privatekey = (ECPrivateKeyParameters) keyPair.Private; var pkinfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privatekey); byte[] pkcs8Blob

When I try to make ECC private key from byte array, I get exception mentioned below. I have public/private keys and out signed output from C library micro-ecc/uECC.h. C used secp192r1 curve. I am trying to verify data with C generated keys in Java. How to convert byte array to private/public key? Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); byte[] kb = new byte[]{(byte)0x24, (byte)0xF4, (byte)0x36, (byte)0x16, (byte)0xD0, (byte)0x96, (byte)0x12, (byte)0x63, (byte)0x90, (byte)0x2E, (byte)0x51, (byte)0xF6, (byte)0x87, (byte)0x55, (byte)0xAB, (byte)0xCB, (byte

The question pretty much sums it up. Are ECDSA and ECDH available for mono? If they are not, will they be? No they are not available inside Mono BCL, nor Xamarin.iOS or Xamarin.Android. There's a bug report for each of them, ECDSA and ECDH , so you might want to add yourself on c.c. to know when this will change. Right now there's no time table to include them. Microsoft .NET supports both, http://msdn.microsoft.com/en-us/library/system.security.cryptography.ecdsacng.aspx http://msdn.microsoft.com/en-us/library/system.security.cryptography.ecdiffiehellmancng.aspx From both Mono source code and

I need to generate an EC Diffie Hellman key pair. I am using the secp256r1 named curve, and OpenSSL. This is what I have with me so far: unsigned char *ecdh(size_t *secret_len) { EVP_PKEY_CTX *pctx, *kctx; EVP_PKEY_CTX *ctx; unsigned char *secret; EVP_PKEY *pkey = NULL, *peerkey, *params = NULL; /* NB: assumes pkey, peerkey have been already set up */ /* Create the context for parameter generation */ if(NULL == (pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL))) printf("Error in EC key generation\n"); /* Initialise the parameter generation */ if(1 != EVP_PKEY_paramgen_init(pctx)) printf("Error in

I need a fixed length 64 Byte ECDSA signature with the NIST P-256 Curve. The implementation hast to use JCE. The following code sample can generate a signature and verify it. Provider provSign = new SunEC(); Provider provVerify = new SunEC(); // generate EC key KeyPairGenerator kg = KeyPairGenerator.getInstance("EC", provSign); ECGenParameterSpec ecParam = new ECGenParameterSpec("secp256r1"); kg.initialize(ecParam); KeyPair keyPair = kg.generateKeyPair(); PrivateKey privateKey = keyPair.getPrivate(); PublicKey publicKey = keyPair.getPublic(); try { // export public key KeyFactory kf =