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Ecc Key Pair Generation Online

ECDSA with secp256k1 in Java: generate ECC keys, sign, verify
ECDSA-secp256k1-example.java
importorg.bouncycastle.util.encoders.Hex;
importorg.web3j.crypto.*;
importjava.math.BigInteger;
publicclassECCExample {
publicstaticStringcompressPubKey(BigIntegerpubKey) {
String pubKeyYPrefix = pubKey.testBit(0) ?'03':'02';
String pubKeyHex = pubKey.toString(16);
String pubKeyX = pubKeyHex.substring(0, 64);
return pubKeyYPrefix + pubKeyX;
}
publicstaticvoidmain(String[] args) throwsException {
//BigInteger privKey = Keys.createEcKeyPair().getPrivateKey();
BigInteger privKey =newBigInteger('97ddae0f3a25b92268175400149d65d6887b9cefaf28ea2c078e05cdc15a3c0a', 16);
BigInteger pubKey =Sign.publicKeyFromPrivate(privKey);
ECKeyPair keyPair =newECKeyPair(privKey, pubKey);
System.out.println('Private key: '+ privKey.toString(16));
System.out.println('Public key: '+ pubKey.toString(16));
System.out.println('Public key (compressed): '+ compressPubKey(pubKey));
String msg ='Message for signing';
byte[] msgHash =Hash.sha3(msg.getBytes());
Sign.SignatureData signature =Sign.signMessage(msgHash, keyPair, false);
System.out.println('Msg: '+ msg);
System.out.println('Msg hash: '+Hex.toHexString(msgHash));
System.out.printf('Signature: [v = %d, r = %s, s = %s]n',
signature.getV() -27,
Hex.toHexString(signature.getR()),
Hex.toHexString(signature.getS()));
System.out.println();
BigInteger pubKeyRecovered =Sign.signedMessageToKey(msg.getBytes(), signature);
System.out.println('Recovered public key: '+ pubKeyRecovered.toString(16));
boolean validSig = pubKey.equals(pubKeyRecovered);
System.out.println('Signature valid? '+ validSig);
}
}

This program demonstrates how to generate elliptic curve cryptography (ECC) key pairs. Eckeycreate.c Example 'C' code for generating elliptic curve cryptography (ECC) key pairs. The program will create and display a new elliptic curve cryptography (ECC) key pair, similar to the output shown below. An ECC key pair includes a private and public key. The ECC private key is used to generate digital signatures, and the ECC public key is used to verify digital signatures. ICSF generates ECC key pairs using the Elliptic Curve Digital Signature Algorithm (ECDSA). This algorithm uses elliptic curve cryptography (an encryption system based on the. To generate a private/public key pair from a pre-eixsting parameters file use the following: openssl ecparam -in secp256k1.pem -genkey -noout -out secp256k1-key.pem Or to do the equivalent operation without a parameters file use the following: openssl ecparam -name secp256k1 -genkey -noout -out secp256k1-key.pem.

pom.xml
<?xml version='1.0' encoding='UTF-8'?>
<projectxmlns='http://maven.apache.org/POM/4.0.0'
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd'>
<modelVersion>4.0.0</modelVersion>
<groupId>bc-examples</groupId>
<artifactId>bc-examples</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.web3j</groupId>
<artifactId>crypto</artifactId>
<version>3.3.1</version>
</dependency>
</dependencies>
</project>

commented Apr 5, 2018

commented Sep 16, 2018

java.security package contains ECDSA classes for generating the key pair, signing and verifying signatures.

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ECC Compatibility

ECC stands for Elliptic Curve Cryptography and is an alternative approach to public key cryptography over other standards such as RSA. Read our ECC article for more information. The tables below cover ECC compatibility across different browsers, operating systems, and platforms. Note that there are different curves within ECC and the compatibility tables below only apply to the NIST approved prime-curves P-256 and P-384 which are also supported by GlobalSign.

While P-256 and P-384 are part of NIST's Suite B algorithms, P-521 is not. Google Chrome has dropped support for the P-521 curve; discussion to do the same in NSS (used in Firefox) is underway.

Also note that for some servers & libraries, the minimum version may not be the same across all platforms. For example, while OpenSSL added support for ECC in 0.9.8, not all servers and operating systems leveraging OpenSSL were compiled with this support enabled. CentOS enabled ECC in OpenSSL starting with version 6.5. Another example is Ubuntu 12.04 LTS enabled ECC support in Apache 2.2.22-1ubuntu1.9.

Operating System Support:

Operating SystemMinimum Version Required
Apple OS X [1]OS X 10.6
Google Android4.0
Microsoft Windows [2]Windows Vista
Red Hat Enterprise Linux [10]6.5

Browser Support:

BrowserMinimum Version Required
Apple Safari4
(On ECC Compatible OS)
Google Chrome* [14]1.0
(On ECC Compatible OS)
Microsoft Internet Explorer* [14]7
(On ECC Compatible OS)
Mozilla Firefox* [14]2.0

Chrome utilizes the cryptographic libraries of the operating system on which it is installed. As a result, Chrome 1.0 can process ECC certificates on Windows Vista+ but not on Windows XP.

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Internet Explorer utilizes Windows system libraries for cryptographic functions. As a result Internet Explorer 7 on Windows XP will not support ECC, but will on Windows Vista+ / Server 2008+.

Mozilla Firefox utilizes the NSS (Network Security Services) libraries to handle cryptographic functions like SSL, TLS, and certificate validation independent of the operating system's cryptographic libraries. This means Firefox 2.0+ will handle ECC certificates even on operating systems that do not natively support ECC such as Windows XP.

Server Support:

Ecc Key Pair Generation Online Games

ServerMinimum Version Required
Apache HTTP Server [7]2.2.26
Apache Tomcat [11]1.1.30
Dovecot [12]2.2.5
IBM HTTP Server [13]8.0 w/ PM80235
NGINX [8]1.1.0
Sun Java System Web Server [16] 7.0
Windows Server [2]2008

Library Support:

LibraryMinimum Version Required
Bouncy Castle [3]1.04
GnuTLS [9]2.99.2
Java* [4] [17]JDK 5 / JDK 7
NSS [5]3.8
OpenSSL [6]0.9.8
OpenSSL FIPS Object Module [15] FIPS Object Module 2.0
(OpenSSL 1.0.1)

Java 5 & 6 support ECC on platforms with native ECC PKCS#11 implementations. Java 7 contains its own native ECC provider.

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Cryptography Next Generation
Bouncy Castle - ECC Key Pair Generation
JDK 5 - ECC Support
Bug 195135 - Add support for Elliptic Curve Cryptography to NSS & SSL​
NGINX Changelog
RHEL 6.5 Release Notes
Tomcat Release Notes
Dovecot News 2.2.5 Released
IBM PM80235
Tested In-house
ECC & OpenSSL Version
Sun Java System Web Server 7.0 Release Notes
JDK 7 Adoption Guide