I need to use NIST P-256 elliptic curves to encrypt and decrypt data. Now that I have generated the key pair, but how do I use them to encrypt and decrypt? The official website only says how to us...

Does iOS expose API for key generation, and secret key derivation using ECDH? From what I see, apple are using it (and specifically x25519) internally but I don't see it exposed as public API by ...

G(Gx, Gy) -- which is also called generator -- is a point on Elliptic Curve (EC) on Finite field. Finite field size = p -- prime modulus. Say we have an EC(Fp): y**2 = x**3 + ax + b (mod p) How sh...

I'm trying to figure out which "safe" ECC curves are supported in Bouncy Castle. I found a few curves in the namespace Org.BouncyCastle.Asn1, but they are hard to find, and I'm sure I'm missing som...

I'm implementing some protocol using some 3rd party repository (Private Join and Compute), and the repo only supports built-in curves in FIPS modules (P-224, 256, 348 and 512) in openssl when creat...

Golang's elliptical curve library can derive a secret key given a public coordinate with a X and Y value (uncompressed coordinates). However, when the point given is a single value in X9.62 compre...

java.security.PublicKey#getEncoded() returns X509 representation of key which in case of ECC adds a lot of overhead compared to raw ECC values. I'd like to be able to convert PublicKey to byte arr...

I have an elliptic curve plotted. I want to draw a line along a P,Q,R (where P and Q will be determined independent of this question). The main problem with the P is that sympy solve() returns anot...

I'm trying to exchange public keys between Browser and Server, and generate secret to be used for encryption of data. I'm trying to utilize ECDH (Elliptic Curve Diffie-Hellman). On the Server side ...

I've been reading this article on elliptic-curve crypto and how it works: http://arstechnica.com/security/2013/10/a-relatively-easy-to-understand-primer-on-elliptic-curve-cryptography/ In the arti...

I am generating a KeyPair for ECC from curve 'secp128r1' using openssl Steps I followed : first I generated a private key using the command openssl ecparam -genkey -name secp128r1 -noout -ou...

I'm using OpenSSL's c library to generate an elliptic curve Diffie-Hellman (ECDH) key pair, following the first code sample here. It glosses over the actual exchange of public keys with this line: ...

I'm working on an app for which the (power)users have to set up their own server (i.e. nginx) to run the backend application. The corresponding domain needs to be configured in the app so it can co...

I have a JWT which is signed using Elliptic Curve ES256 am trying to validate it: eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IjEyMzQifQ.eyJpc3MiOiJodHRwczovL2p3dC1pZHAuZXhhbXBsZS5jb20iLCJzdWIiOiJt...

Currently i'm updating my x.509 certificate library to support ECC. Most of the builders that are implemented take a publicKey and derive the algorithm and such from the key. In RSA this is simple,...

Problem I have generated keys and certificates by OpenSSL with the secp256k1, run rke version v1.2.8 from the Rancher Kubernetes Engine (RKE), and got the following error: FATA[0000] Failed to read...

It appears that .NET Core supports creation of custom curves in ECC. I've tried to define the Curve25519, as shown below: public class Curves { // TODO: check the key gen rand. public static E...

It seems that .NET (Core 3.1) supports custom curves in ECC. So I've defined the Curve25519, and generated key pair by below code: using System; using System.Security.Cryptography; namespace Curve...

I'ld like to calculate a public key from a private key. It must work using OpenCL. It seems hashcat has a nice library but I'm not sure how to use it. https://github.com/hashcat/hashcat/blob/maste...

I am passing a byte[] to my method and I am trying to generate a pubKey. Looking at the error look's like i first need to decompress before generating pubKey. How can I decode a compressed coordina...

Is there any example for use ECC in iOS? I noticed that the kSecAttrKeyTypeEC in Apple Developer Documents, but I can't use it to generic Key pair. Below code is modified from the example CryptoE...

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 =...

I need to implement ECC (Elliptic Curve Cryptography) algorithm using jdk 1.7. I tried using bouncy castle, sunEC, but all of them gave errors and errors. My target is to generate an elliptic curve...

I need to derive an EC Public Key from an EC private key string without the "help" of any third party library. The Private key is externally produced and provided and I need to get the Public Key...

I need to generate some keypairs with the ed25519 curve for NodeJS's elliptic module for a project I'm working on. After some searching, a discovered that this can be done with the following comman...