ecdsa

I am using the ecdsa.GenerateKey method to generate a private/public key pair in Go. I would like to store the private key in a file on the users computer, and load it whenever the program starts. There is a method elliptic.Marshal that marshals the public key, but nothing for the private key. Should I simply roll my own, or is there a recommended way to store the private key? Here is a code sample that demonstrates encoding and decoding of keys in Go. It helps to know that you need to connect couple of steps. Crypto algorithm is the fist step, in this case ECDSA key. Then you need standard

This SO question ECDSA sign using OpenSSL without ASN1 encoding the hash states the OpenSSL perfoms ASN1 encoding to the hash before signing it. In other words it states that OpenSSL performs the following steps when for an Elliptic curve key -sign is called: a. Calculate H = Hash(M) b. Encode H into ASN1 standard- H’ c. Sign H’ And thus to avoid applyting step b it's neccessary to first calculate the digest, and then sign the digest using raw signing - pkeyutl for elliptic curver keys However when I run BOTH -sign and -dgst+ -pkeyutl I am able to verify the signature using -verify in both

I have to get ECDSA signature in variable using Crypto++. I tried to get it after launching SignMessage but signature is empty. How could i get it? Have you had a look at the Crypto++ wiki? There's a lot of stuff on Elliptic Curve Digital Signature Algorithm . Its not really clear what you are doing or where things went wrong, so here's a copy and paste from the wiki: Signing: ECDSA<ECP, SHA1>::PrivateKey privateKey; privateKey.Load(...); AutoSeededRandomPool prng; string message = "Yoda said, Do or do not. There is no try."; string signature; StringSource ss1( message, true /*pump all*/, new

Currently, I am creating keyPair using this method private KeyPair getKeyPair() throws NoSuchAlgorithmException, NoSuchProviderException, InvalidAlgorithmParameterException { KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDsA", "SC"); ECGenParameterSpec ecSpec = new ECGenParameterSpec("secp256k1"); keyGen.initialize(ecSpec, new SecureRandom()); return keyGen.generateKeyPair(); } KeyPairGenerator has another method, in which I can specify keySize but I am not sure how I will pass the keySpecs? public void initialize(int keysize, SecureRandom random) Your code is already sufficient,

I have tested a solution to verify an ECDSA signature ( How can I get a PublicKey object from EC public key bytes? ) that works perfect with the given data. This is the data: byte[] pubKey = DatatypeConverter.parseHexBinary("049a55ad1e210cd113457ccd3465b930c9e7ade5e760ef64b63142dad43a308ed08e2d85632e8ff0322d3c7fda14409eafdc4c5b8ee0882fe885c92e3789c36a7a"); byte[] message = DatatypeConverter.parseHexBinary("54686973206973206a75737420736f6d6520706f696e746c6573732064756d6d7920737472696e672e205468616e6b7320616e7977617920666f722074616b696e67207468652074696d6520746f206465636f6465206974203b2d29");

When I create a new Amazon EC2 server, I connect to it using ssh as usual. I see the typical warning: $ ssh myserver The authenticity of host 'ec2-12-34-567-890.compute-1.amazonaws.com (12.34.567.890)' can't be established. ECDSA key fingerprint is 31:66:15:d2:19:41:2b:09:8a:8f:9f:bd:de:c6:ff:07. Are you sure you want to continue connecting (yes/no)? How do I verify the fingerprint before I sign in? Ideally an answer is based on something besides the original creation console log -- because the log may get flushed out after a system restart, or during a large system installation script that