mirror of
https://github.com/bitcoin-s/bitcoin-s.git
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106 lines
3.3 KiB
Markdown
106 lines
3.3 KiB
Markdown
[  ](https://bintray.com/bitcoin-s/bitcoin-s-core/bitcoin-s-secp256k1jni/_latestVersion)
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## Secp256k1jni
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This project gives people a convenient way to use [libsecp256k1](https://github.com/bitcoin-core/secp256k1) on the JVM without compiling natives themselves.
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Currently we have support for natives on
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1. [linux 32 bit](natives/linux_32)
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2. [linux 64 bit](natives/linux_64)
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3. [mac osx 64 bit](natives/osx_64)
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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
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```scala
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sbt:root> project secp256k1jni
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[info] Set current project to bitcoin-s-secp256k1jni (in build file:/home/chris/dev/bitcoin-s-core/)
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sbt:bitcoin-s-secp256k1jni> console
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[info] Starting scala interpreter...
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Welcome to Scala 2.12.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_191).
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Type in expressions for evaluation. Or try :help.
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scala> import org.bitcoin.Secp256k1Context;
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scala> Secp256k1Context.isEnabled()
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SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
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SLF4J: Defaulting to no-operation (NOP) logger implementation
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SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
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res0: Boolean = true
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```
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## Adding secp256k1jni to your project
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To add `bitcoin-s-secp256k1jni` to your project you add it like this
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```
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"org.bitcoins" % "bitcoin-s-secp256k1jni" % "0.0.1"
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```
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or with maven
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```
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<dependency>
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<groupId>org.bitcoins</groupId>
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<artifactId>bitcoin-s-secp256k1jni</artifactId>
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<version>0.0.1</version>
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</dependency>
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```
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## Using secp256k1
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The file [NativeSecp256k1.java](src/main/java/org/bitcoin/NativeSecp256k1.java) contains basic functionality for
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1. Verifying digital signatures
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2. Producing digital signatures
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3. Computing a public key from a private key
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4. tweaking keys
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5. Checking public key validity
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## Binaries
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The binaries provided here are PGP signed, to give at least some assurances that
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nothing funny has happened to them.
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### macOS 64 bit
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```bash
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bitcoin-s/secp256k1jni/natives/osx_64 $ find -type f -exec sha256sum {} \; | \
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sort -k 2 | sha256sum | cut --fields 1 --delimiter=" " | \
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gpg --clearsign --output hashed-dir.sig --detach-sig
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bitcoin-s/secp256k1jni/natives/osx_64 $ cat hashed-dir.sig
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-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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341d768b915d989db82c1fb94b29faec9509ad45e30a27c217feb121747789ce
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-----BEGIN PGP SIGNATURE-----
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iQEzBAEBCgAdFiEEcQE9FyWyvvLjrwybHk0b2DvgrM0FAlxPHuQACgkQHk0b2Dvg
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rM07EwgApXWPlVKMDP7Z8RQhhDmlnycTJxFaw315TH2IKDMEtCA0mBGY8UOy7jis
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ZtQEyUQdspBnLW6RHeEBhkDlQzjMS3G4K2T2D1r2eL4vXf7dnZ2CUSy7N9Gd8Lsy
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Tcdi9a/GSyFu1RCtmklCZ75/oECPlmNctdOY30+5FDIfWIcTHqKebfDstTqeYGbd
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0+U5N2xDI/07g5jCF1EsgiqvFkXZEjI/44xlxWon6GtbiYR/n+MHzgwBi5XqNs2p
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0t3Tvx5NbJiVVn7K2ThQFaW4ap/bqggZh1ddT/v2Wq0BH+UX6b6Abrq0tD5+ZPst
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5+tz19oEa9XK+X/DDkFrT4WEMDpyIw==
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=CauS
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-----END PGP SIGNATURE-----
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bitcoin-s/secp256k1jni/natives/osx_64 $ gpg --verify hashed-dir.sig
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gpg: Signature made Mon 28 Jan 2019 04:25:24 PM CET
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gpg: using RSA key 71013D1725B2BEF2E3AF0C9B1E4D1BD83BE0ACCD
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gpg: Good signature from "Torkel Rogstad <torkel@suredbits.com>" [ultimate]
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```
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### Linux 32 bit
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TODO
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### Linux 64 bit
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TODO
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