bitcoin-s/secp256k1jni

Secp256k1jni

This project gives people a conviinent way to use libsecp256k1 on the JVM without compiling natives themselves.

Currently we have support for natives on

1. linux 32 bit
2. linux 64 bit
3. mac osx 64 bit

This uses a zero depdency library called native-lib-loader. The does the appropriate loading of the library onto your classpath to be accessed. To tell if you have access to libsecp256k1 you can do the following

sbt:root> project secp256k1jni
[info] Set current project to bitcoin-s-secp256k1jni (in build file:/home/chris/dev/bitcoin-s-core/)
sbt:bitcoin-s-secp256k1jni> console
[info] Starting scala interpreter...
Welcome to Scala 2.12.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_191).
Type in expressions for evaluation. Or try :help.

scala> import org.bitcoin.Secp256k1Context;

scala> Secp256k1Context.isEnabled()
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
res0: Boolean = true

Adding secp256k1jni to your project

To add bitcoin-s-secp256k1jni to your project you add it like this

"org.bitcoins" % "bitcoin-s-secp256k1jni" % "0.0.1"

or with maven

<dependency>
  <groupId>org.bitcoins</groupId>
  <artifactId>bitcoin-s-secp256k1jni</artifactId>
  <version>0.0.1</version>
</dependency>

Using secp256k1

The file NativeSecp256k1.java contains basic functionality for

1. Verifying digital signatures
2. Producing digital signatures
3. Computing a public key from a private key
4. tweaking keys
5. Checking public key validity