JVM implementation

native/build-ios.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -e
+
+cp xconfigure.sh secp256k1
+
+cd secp256k1
+
+./autogen.sh
+sh xconfigure.sh --enable-experimental --enable-module_ecdh --enable-module-recovery --enable-benchmark=no --enable-shared=no --enable-exhaustive-tests=no --enable-tests=no
+
+mkdir -p ../build/ios
+cp -v _build/universal/* ../build/ios/
+
+rm -rf _build
+make clean

native/build.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+set -e
+
+[[ -z "$TARGET" ]] && echo "Please set the PLATFORM variable" && exit 1
+
+cd secp256k1
+
+if [ "$TARGET" == "mingw" ]; then
+  CONF_OPTS="CFLAGS=-fpic --host=x86_64-w64-mingw32"
+elif [ "$TARGET" == "linux" ]; then
+  CONF_OPTS="CFLAGS=-fpic"
+fi
+
+./autogen.sh
+./configure $CONF_OPTS --enable-experimental --enable-module_ecdh --enable-module-recovery --enable-benchmark=no --enable-shared=no --enable-exhaustive-tests=no --enable-tests=no
+make clean
+make
+
+cd ..
+
+mkdir -p build/$TARGET
+cp -r secp256k1/.libs/libsecp256k1.a build/$TARGET/
+
+GCC=gcc
+JNI_HEADERS=$TARGET
+
+if [ "$TARGET" == "linux" ]; then
+  OUTFILE=libsecp256k1-jni.so
+elif [ "$TARGET" == "darwin" ]; then
+  OUTFILE=libsecp256k1-jni.dylib
+  ADD_LIB=-lgmp
+elif [ "$TARGET" == "mingw" ]; then
+  OUTFILE=secp256k1-jni.dll
+  GCC=/usr/src/mxe/usr/bin/x86_64-w64-mingw32.static-gcc
+  JNI_HEADERS=linux
+  GCC_OPTS="-fpic"
+fi
+
+echo $GCC -shared $GCC_OPTS -o build/$TARGET/$OUTFILE jni/src/org_bitcoin_NativeSecp256k1.c jni/src/org_bitcoin_Secp256k1Context.c -Ijni/headers/ -Ijni/headers/$JNI_HEADERS/ -Isecp256k1/ -lsecp256k1 -Lbuild/$TARGET/ $ADD_LIB
+
+$GCC -shared $GCC_OPTS -o build/$TARGET/$OUTFILE jni/src/org_bitcoin_NativeSecp256k1.c jni/src/org_bitcoin_Secp256k1Context.c -Ijni/headers/ -Ijni/headers/$JNI_HEADERS/ -Isecp256k1/ -lsecp256k1 -Lbuild/$TARGET/ $ADD_LIB

native/dockcross-linux-x64

@@ -0,0 +1,256 @@
+#!/usr/bin/env bash
+
+DEFAULT_DOCKCROSS_IMAGE=dockcross/linux-x64:latest
+
+#------------------------------------------------------------------------------
+# Helpers
+#
+err() {
+    echo -e >&2 ERROR: $@\\n
+}
+
+die() {
+    err $@
+    exit 1
+}
+
+has() {
+    # eg. has command update
+    local kind=$1
+    local name=$2
+
+    type -t $kind:$name | grep -q function
+}
+
+#------------------------------------------------------------------------------
+# Command handlers
+#
+command:update-image() {
+    docker pull $FINAL_IMAGE
+}
+
+help:update-image() {
+    echo Pull the latest $FINAL_IMAGE .
+}
+
+command:update-script() {
+    if cmp -s <( docker run --rm $FINAL_IMAGE ) $0; then
+        echo $0 is up to date
+    else
+        echo -n Updating $0 '... '
+        docker run --rm $FINAL_IMAGE > $0 && echo ok
+    fi
+}
+
+help:update-image() {
+    echo Update $0 from $FINAL_IMAGE .
+}
+
+command:update() {
+    command:update-image
+    command:update-script
+}
+
+help:update() {
+    echo Pull the latest $FINAL_IMAGE, and then update $0 from that.
+}
+
+command:help() {
+    if [[ $# != 0 ]]; then
+        if ! has command $1; then
+            err \"$1\" is not an dockcross command
+            command:help
+        elif ! has help $1; then
+            err No help found for \"$1\"
+        else
+            help:$1
+        fi
+    else
+        cat >&2 <<ENDHELP
+Usage: dockcross [options] [--] command [args]
+
+By default, run the given *command* in an dockcross Docker container.
+
+The *options* can be one of:
+
+    --args|-a           Extra args to the *docker run* command
+    --image|-i          Docker cross-compiler image to use
+    --config|-c         Bash script to source before running this script
+
+
+Additionally, there are special update commands:
+
+    update-image
+    update-script
+    update
+
+For update command help use: $0 help <command>
+ENDHELP
+        exit 1
+    fi
+}
+
+#------------------------------------------------------------------------------
+# Option processing
+#
+special_update_command=''
+while [[ $# != 0 ]]; do
+    case $1 in
+
+        --)
+            shift
+            break
+            ;;
+
+        --args|-a)
+            ARG_ARGS="$2"
+            shift 2
+            ;;
+
+        --config|-c)
+            ARG_CONFIG="$2"
+            shift 2
+            ;;
+
+        --image|-i)
+            ARG_IMAGE="$2"
+            shift 2
+            ;;
+        update|update-image|update-script)
+            special_update_command=$1
+            break
+            ;;
+        -*)
+            err Unknown option \"$1\"
+            command:help
+            exit
+            ;;
+
+        *)
+            break
+            ;;
+
+    esac
+done
+
+# The precedence for options is:
+# 1. command-line arguments
+# 2. environment variables
+# 3. defaults
+
+# Source the config file if it exists
+DEFAULT_DOCKCROSS_CONFIG=~/.dockcross
+FINAL_CONFIG=${ARG_CONFIG-${DOCKCROSS_CONFIG-$DEFAULT_DOCKCROSS_CONFIG}}
+
+[[ -f "$FINAL_CONFIG" ]] && source "$FINAL_CONFIG"
+
+# Set the docker image
+FINAL_IMAGE=${ARG_IMAGE-${DOCKCROSS_IMAGE-$DEFAULT_DOCKCROSS_IMAGE}}
+
+# Handle special update command
+if [ "$special_update_command" != "" ]; then
+    case $special_update_command in
+
+        update)
+            command:update
+            exit $?
+            ;;
+
+        update-image)
+            command:update-image
+            exit $?
+            ;;
+
+        update-script)
+            command:update-script
+            exit $?
+            ;;
+
+    esac
+fi
+
+# Set the docker run extra args (if any)
+FINAL_ARGS=${ARG_ARGS-${DOCKCROSS_ARGS}}
+
+# Bash on Ubuntu on Windows
+UBUNTU_ON_WINDOWS=$([ -e /proc/version ] && grep -l Microsoft /proc/version || echo "")
+# MSYS, Git Bash, etc.
+MSYS=$([ -e /proc/version ] && grep -l MINGW /proc/version || echo "")
+
+if [ -z "$UBUNTU_ON_WINDOWS" -a -z "$MSYS" ]; then
+    USER_IDS=(-e BUILDER_UID="$( id -u )" -e BUILDER_GID="$( id -g )" -e BUILDER_USER="$( id -un )" -e BUILDER_GROUP="$( id -gn )")
+fi
+
+# Change the PWD when working in Docker on Windows
+if [ -n "$UBUNTU_ON_WINDOWS" ]; then
+    WSL_ROOT="/mnt/"
+    CFG_FILE=/etc/wsl.conf
+	if [ -f "$CFG_FILE" ]; then
+		CFG_CONTENT=$(cat $CFG_FILE | sed -r '/[^=]+=[^=]+/!d' | sed -r 's/\s+=\s/=/g')
+		eval "$CFG_CONTENT"
+		if [ -n "$root" ]; then
+			WSL_ROOT=$root
+		fi
+	fi
+    HOST_PWD=`pwd -P`
+    HOST_PWD=${HOST_PWD/$WSL_ROOT//}
+elif [ -n "$MSYS" ]; then
+    HOST_PWD=$PWD
+    HOST_PWD=${HOST_PWD/\//}
+    HOST_PWD=${HOST_PWD/\//:\/}
+else
+    HOST_PWD=$PWD
+    [ -L $HOST_PWD ] && HOST_PWD=$(readlink $HOST_PWD)
+fi
+
+# Mount Additional Volumes
+if [ -z "$SSH_DIR" ]; then
+    SSH_DIR="$HOME/.ssh"
+fi
+
+HOST_VOLUMES=
+if [ -e "$SSH_DIR" -a -z "$MSYS" ]; then
+    HOST_VOLUMES+="-v $SSH_DIR:/home/$(id -un)/.ssh"
+fi
+
+#------------------------------------------------------------------------------
+# Now, finally, run the command in a container
+#
+TTY_ARGS=
+tty -s && [ -z "$MSYS" ] && TTY_ARGS=-ti
+CONTAINER_NAME=dockcross_$RANDOM
+docker run $TTY_ARGS --name $CONTAINER_NAME \
+    -v "$HOST_PWD":/work \
+    $HOST_VOLUMES \
+    "${USER_IDS[@]}" \
+    $FINAL_ARGS \
+    $FINAL_IMAGE "$@"
+run_exit_code=$?
+
+# Attempt to delete container
+rm_output=$(docker rm -f $CONTAINER_NAME 2>&1)
+rm_exit_code=$?
+if [[ $rm_exit_code != 0 ]]; then
+  if [[ "$CIRCLECI" == "true" ]] && [[ $rm_output == *"Driver btrfs failed to remove"* ]]; then
+    : # Ignore error because of https://circleci.com/docs/docker-btrfs-error/
+  else
+    echo "$rm_output"
+    exit $rm_exit_code
+  fi
+fi
+
+exit $run_exit_code
+
+################################################################################
+#
+# This image is not intended to be run manually.
+#
+# To create a dockcross helper script for the
+# dockcross/linux-x64:latest image, run:
+#
+# docker run --rm dockcross/linux-x64:latest > dockcross-linux-x64-latest
+# chmod +x dockcross-linux-x64-latest
+#
+# You may then wish to move the dockcross script to your PATH.
+#
+################################################################################

native/dockcross-windows-x64

@@ -0,0 +1,200 @@
+#!/bin/bash
+
+DEFAULT_DOCKCROSS_IMAGE=dockcross/windows-x64
+
+#------------------------------------------------------------------------------
+# Helpers
+#
+err() {
+    echo -e >&2 ERROR: $@\\n
+}
+
+die() {
+    err $@
+    exit 1
+}
+
+has() {
+    # eg. has command update
+    local kind=$1
+    local name=$2
+
+    type -t $kind:$name | grep -q function
+}
+
+#------------------------------------------------------------------------------
+# Command handlers
+#
+command:update-image() {
+    docker pull $FINAL_IMAGE
+}
+
+help:update-image() {
+    echo Pull the latest $FINAL_IMAGE .
+}
+
+command:update-script() {
+    if cmp -s <( docker run $FINAL_IMAGE ) $0; then
+        echo $0 is up to date
+    else
+        echo -n Updating $0 '... '
+        docker run $FINAL_IMAGE > $0 && echo ok
+    fi
+}
+
+help:update-image() {
+    echo Update $0 from $FINAL_IMAGE .
+}
+
+command:update() {
+    command:update-image
+    command:update-script
+}
+
+help:update() {
+    echo Pull the latest $FINAL_IMAGE, and then update $0 from that.
+}
+
+command:help() {
+    if [[ $# != 0 ]]; then
+        if ! has command $1; then
+            err \"$1\" is not an dockcross command
+            command:help
+        elif ! has help $1; then
+            err No help found for \"$1\"
+        else
+            help:$1
+        fi
+    else
+        cat >&2 <<ENDHELP
+Usage: dockcross [options] [--] command [args]
+
+By default, run the given *command* in an dockcross Docker container.
+
+The *options* can be one of:
+
+    --args|-a           Extra args to the *docker run* command
+    --image|-i          Docker cross-compiler image to use
+    --config|-c         Bash script to source before running this script
+
+
+Additionally, there are special update commands:
+
+    update-image
+    update-script
+    update
+
+For update command help use: $0 help <command>
+ENDHELP
+        exit 1
+    fi
+}
+
+#------------------------------------------------------------------------------
+# Option processing
+#
+special_update_command=''
+while [[ $# != 0 ]]; do
+    case $1 in
+
+        --)
+            break
+            ;;
+
+        --args|-a)
+            ARG_ARGS="$2"
+            shift 2
+            ;;
+
+        --config|-c)
+            ARG_CONFIG="$2"
+            shift 2
+            ;;
+
+        --image|-i)
+            ARG_IMAGE="$2"
+            shift 2
+            ;;
+        update|update-image|update-script)
+            special_update_command=$1
+            break
+            ;;
+        -*)
+            err Unknown option \"$1\"
+            command:help
+            exit
+            ;;
+
+        *)
+            break
+            ;;
+
+    esac
+done
+
+# The precedence for options is:
+# 1. command-line arguments
+# 2. environment variables
+# 3. defaults
+
+# Source the config file if it exists
+DEFAULT_DOCKCROSS_CONFIG=~/.dockcross
+FINAL_CONFIG=${ARG_CONFIG-${DOCKCROSS_CONFIG-$DEFAULT_DOCKCROSS_CONFIG}}
+
+[[ -f "$FINAL_CONFIG" ]] && source "$FINAL_CONFIG"
+
+# Set the docker image
+FINAL_IMAGE=${ARG_IMAGE-${DOCKCROSS_IMAGE-$DEFAULT_DOCKCROSS_IMAGE}}
+
+# Handle special update command
+if [ "$special_update_command" != "" ]; then
+    case $special_update_command in
+
+        update)
+            command:update
+            exit $?
+            ;;
+
+        update-image)
+            command:update-image
+            exit $?
+            ;;
+
+        update-script)
+            command:update-script
+            exit $?
+            ;;
+
+    esac
+fi
+
+# Set the docker run extra args (if any)
+FINAL_ARGS=${ARG_ARGS-${DOCKCROSS_ARGS}}
+
+# If we are not running via boot2docker
+if [ -z $DOCKER_HOST ]; then
+    USER_IDS=(-e BUILDER_UID="$( id -u )" -e BUILDER_GID="$( id -g )" -e BUILDER_USER="$( id -un )" -e BUILDER_GROUP="$( id -gn )")
+fi
+
+#------------------------------------------------------------------------------
+# Now, finally, run the command in a container
+#
+docker run --rm \
+    -v $PWD:/work \
+    "${USER_IDS[@]}" \
+    $FINAL_ARGS \
+    $FINAL_IMAGE "$@"
+
+################################################################################
+#
+# This image is not intended to be run manually.
+#
+# To create a dockcross helper script for the
+# dockcross/linux-armv7 image, run:
+#
+# docker run --rm dockcross/linux-armv7 > dockcross-linux-armv7
+# chmod +x dockcross-linux-armv7
+#
+# You may then wish to move the dockcross script to your PATH.
+#
+################################################################################

native/jni/headers/darwin/jni_md.h

@@ -0,0 +1,23 @@
+/*
+ * @(#)jni_md.h	1.19 05/11/17
+ *
+ * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
+ * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
+ */
+
+#ifndef _JAVASOFT_JNI_MD_H_
+#define _JAVASOFT_JNI_MD_H_
+
+#define JNIEXPORT __attribute__((visibility("default")))
+#define JNIIMPORT
+#define JNICALL
+
+#if defined(__LP64__) && __LP64__ /* for -Wundef */
+typedef int jint;
+#else
+typedef long jint;
+#endif
+typedef long long jlong;
+typedef signed char jbyte;
+
+#endif /* !_JAVASOFT_JNI_MD_H_ */

native/jni/headers/linux/jni_md.h

@@ -0,0 +1,24 @@
+/*
+ * %W% %E%
+ *
+ * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
+ * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
+ */
+
+#ifndef _JAVASOFT_JNI_MD_H_
+#define _JAVASOFT_JNI_MD_H_
+
+#define JNIEXPORT __attribute__((__visibility__("default")))
+#define JNIIMPORT
+#define JNICALL
+
+typedef int jint;
+#ifdef _LP64 /* 64-bit Solaris */
+typedef long jlong;
+#else
+typedef long long jlong;
+#endif
+
+typedef signed char jbyte;
+
+#endif /* !_JAVASOFT_JNI_MD_H_ */

native/jni/headers/mingw/jni_md.h

@@ -0,0 +1,19 @@
+/*
+ * @(#)jni_md.h	1.14 03/12/19
+ *
+ * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
+ * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
+ */
+
+#ifndef _JAVASOFT_JNI_MD_H_
+#define _JAVASOFT_JNI_MD_H_
+
+#define JNIEXPORT __declspec(dllexport)
+#define JNIIMPORT __declspec(dllimport)
+#define JNICALL __stdcall
+
+typedef long jint;
+typedef int64_t jlong;
+typedef signed char jbyte;
+
+#endif /* !_JAVASOFT_JNI_MD_H_ */

native/jni/src/org_bitcoin_NativeSecp256k1.c

@@ -0,0 +1,630 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include "org_bitcoin_NativeSecp256k1.h"
+#include "include/secp256k1.h"
+#include "include/secp256k1_ecdh.h"
+#include "include/secp256k1_recovery.h"
+
+
+SECP256K1_API jlong JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ctx_1clone
+  (JNIEnv* env, jclass classObject, jlong ctx_l)
+{
+  const secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+
+  jlong ctx_clone_l = (uintptr_t) secp256k1_context_clone(ctx);
+
+  (void)classObject;(void)env;
+
+  return ctx_clone_l;
+
+}
+
+SECP256K1_API jint JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1context_1randomize
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+
+  const unsigned char* seed = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+
+  (void)classObject;
+
+  return secp256k1_context_randomize(ctx, seed);
+
+}
+
+SECP256K1_API void JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1destroy_1context
+  (JNIEnv* env, jclass classObject, jlong ctx_l)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+
+  secp256k1_context_destroy(ctx);
+
+  (void)classObject;(void)env;
+}
+
+SECP256K1_API jint JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdsa_1verify
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l, jint siglen, jint publen)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+
+  unsigned char* data = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+  const unsigned char* sigdata = {  (unsigned char*) (data + 32) };
+  const unsigned char* pubdata = { (unsigned char*) (data + siglen + 32) };
+
+  secp256k1_ecdsa_signature sig;
+  secp256k1_pubkey pubkey;
+
+  int ret = 0;
+  if (siglen == 64) {
+      ret = secp256k1_ecdsa_signature_parse_compact(ctx, &sig, sigdata);
+  } else {
+      ret = secp256k1_ecdsa_signature_parse_der(ctx, &sig, sigdata, siglen);
+  }
+
+  if( ret ) {
+    ret = secp256k1_ec_pubkey_parse(ctx, &pubkey, pubdata, publen);
+
+    if( ret ) {
+      ret = secp256k1_ecdsa_verify(ctx, &sig, data, &pubkey);
+    }
+  }
+
+  (void)classObject;
+
+  return ret;
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdsa_1sign
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  unsigned char* data = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+  unsigned char* secKey = (unsigned char*) (data + 32);
+
+  jobjectArray retArray;
+  jbyteArray sigArray, intsByteArray;
+  unsigned char intsarray[2];
+
+  secp256k1_ecdsa_signature sig;
+
+  int ret = secp256k1_ecdsa_sign(ctx, &sig, data, secKey, NULL, NULL);
+
+  unsigned char outputSer[72];
+  size_t outputLen = 72;
+
+  if( ret ) {
+    int ret2 = secp256k1_ecdsa_signature_serialize_der(ctx,outputSer, &outputLen, &sig ); (void)ret2;
+  }
+
+  intsarray[0] = outputLen;
+  intsarray[1] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  sigArray = (*env)->NewByteArray(env, outputLen);
+  (*env)->SetByteArrayRegion(env, sigArray, 0, outputLen, (jbyte*)outputSer);
+  (*env)->SetObjectArrayElement(env, retArray, 0, sigArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 2);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdsa_1sign_1compact
+(JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  unsigned char* data = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+  unsigned char* secKey = (unsigned char*) (data + 32);
+
+  jobjectArray retArray;
+  jbyteArray sigArray, intsByteArray;
+  unsigned char intsarray[2];
+
+  secp256k1_ecdsa_signature sig[72];
+
+  int ret = secp256k1_ecdsa_sign(ctx, sig, data, secKey, NULL, NULL);
+
+   unsigned char outputSer[64];
+   size_t outputLen = 64;
+
+  if( ret ) {
+    int ret2 = secp256k1_ecdsa_signature_serialize_compact(ctx,outputSer, sig ); (void)ret2;
+  }
+
+  intsarray[0] = outputLen;
+  intsarray[1] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  sigArray = (*env)->NewByteArray(env, outputLen);
+  (*env)->SetByteArrayRegion(env, sigArray, 0, outputLen, (jbyte*)outputSer);
+  (*env)->SetObjectArrayElement(env, retArray, 0, sigArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 2);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+
+SECP256K1_API jint JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ec_1seckey_1verify
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  unsigned char* secKey = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+
+  (void)classObject;
+
+  return secp256k1_ec_seckey_verify(ctx, secKey);
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ec_1pubkey_1create
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  const unsigned char* secKey = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+
+  secp256k1_pubkey pubkey;
+
+  jobjectArray retArray;
+  jbyteArray pubkeyArray, intsByteArray;
+  unsigned char intsarray[2];
+
+  int ret = secp256k1_ec_pubkey_create(ctx, &pubkey, secKey);
+
+  unsigned char outputSer[65];
+  size_t outputLen = 65;
+
+  if( ret ) {
+    int ret2 = secp256k1_ec_pubkey_serialize(ctx,outputSer, &outputLen, &pubkey,SECP256K1_EC_UNCOMPRESSED );(void)ret2;
+  }
+
+  intsarray[0] = outputLen;
+  intsarray[1] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  pubkeyArray = (*env)->NewByteArray(env, outputLen);
+  (*env)->SetByteArrayRegion(env, pubkeyArray, 0, outputLen, (jbyte*)outputSer);
+  (*env)->SetObjectArrayElement(env, retArray, 0, pubkeyArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 2);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ec_1pubkey_1parse
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l, jint inputlen)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  const unsigned char* pubkeydata = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+
+  secp256k1_pubkey pubkey;
+
+  jobjectArray retArray;
+  jbyteArray pubkeyArray, intsByteArray;
+  unsigned char intsarray[2];
+
+  int ret = secp256k1_ec_pubkey_parse(ctx, &pubkey, pubkeydata, inputlen);
+
+  unsigned char outputSer[65];
+  size_t outputLen = 65;
+
+  if( ret ) {
+    int ret2 = secp256k1_ec_pubkey_serialize(ctx,outputSer, &outputLen, &pubkey, SECP256K1_EC_UNCOMPRESSED );(void)ret2;
+  }
+
+  intsarray[0] = outputLen;
+  intsarray[1] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  pubkeyArray = (*env)->NewByteArray(env, outputLen);
+  (*env)->SetByteArrayRegion(env, pubkeyArray, 0, outputLen, (jbyte*)outputSer);
+  (*env)->SetObjectArrayElement(env, retArray, 0, pubkeyArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 2);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1privkey_1negate
+(JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l)
+{
+    secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+    unsigned char* privkey = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+
+    jobjectArray retArray;
+    jbyteArray privArray, intsByteArray;
+    unsigned char intsarray[2];
+
+    int privkeylen = 32;
+
+    int ret = secp256k1_ec_privkey_negate(ctx, privkey);
+
+    intsarray[0] = privkeylen;
+    intsarray[1] = ret;
+
+    retArray = (*env)->NewObjectArray(env, 2,
+      (*env)->FindClass(env, "[B"),
+      (*env)->NewByteArray(env, 1));
+
+    privArray = (*env)->NewByteArray(env, privkeylen);
+    (*env)->SetByteArrayRegion(env, privArray, 0, privkeylen, (jbyte*)privkey);
+    (*env)->SetObjectArrayElement(env, retArray, 0, privArray);
+
+    intsByteArray = (*env)->NewByteArray(env, 2);
+    (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+    (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+    (void)classObject;
+
+    return retArray;
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1privkey_1tweak_1add
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  unsigned char* privkey = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+  const unsigned char* tweak = (unsigned char*) (privkey + 32);
+
+  jobjectArray retArray;
+  jbyteArray privArray, intsByteArray;
+  unsigned char intsarray[2];
+
+  int privkeylen = 32;
+
+  int ret = secp256k1_ec_privkey_tweak_add(ctx, privkey, tweak);
+
+  intsarray[0] = privkeylen;
+  intsarray[1] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  privArray = (*env)->NewByteArray(env, privkeylen);
+  (*env)->SetByteArrayRegion(env, privArray, 0, privkeylen, (jbyte*)privkey);
+  (*env)->SetObjectArrayElement(env, retArray, 0, privArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 2);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1privkey_1tweak_1mul
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  unsigned char* privkey = (unsigned char*) (*env)->GetDirectBufferAddress(env, byteBufferObject);
+  const unsigned char* tweak = (unsigned char*) (privkey + 32);
+
+  jobjectArray retArray;
+  jbyteArray privArray, intsByteArray;
+  unsigned char intsarray[2];
+
+  int privkeylen = 32;
+
+  int ret = secp256k1_ec_privkey_tweak_mul(ctx, privkey, tweak);
+
+  intsarray[0] = privkeylen;
+  intsarray[1] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  privArray = (*env)->NewByteArray(env, privkeylen);
+  (*env)->SetByteArrayRegion(env, privArray, 0, privkeylen, (jbyte*)privkey);
+  (*env)->SetObjectArrayElement(env, retArray, 0, privArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 2);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1pubkey_1negate
+(JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l, jint publen)
+{
+    secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+    unsigned char* pkey = (*env)->GetDirectBufferAddress(env, byteBufferObject);
+
+    jobjectArray retArray;
+    jbyteArray pubArray, intsByteArray;
+    unsigned char intsarray[2];
+    unsigned char outputSer[65];
+    size_t outputLen = publen;
+
+    secp256k1_pubkey pubkey;
+    int ret = secp256k1_ec_pubkey_parse(ctx, &pubkey, pkey, publen);
+
+    if( ret ) {
+      ret = secp256k1_ec_pubkey_negate(ctx, &pubkey);
+    }
+
+    if( ret ) {
+      int ret2 = secp256k1_ec_pubkey_serialize(ctx,outputSer, &outputLen, &pubkey, publen == 33 ?  SECP256K1_EC_COMPRESSED : SECP256K1_EC_UNCOMPRESSED );(void)ret2;
+    }
+
+    intsarray[0] = outputLen;
+    intsarray[1] = ret;
+
+    retArray = (*env)->NewObjectArray(env, 2,
+      (*env)->FindClass(env, "[B"),
+      (*env)->NewByteArray(env, 1));
+
+    pubArray = (*env)->NewByteArray(env, outputLen);
+    (*env)->SetByteArrayRegion(env, pubArray, 0, outputLen, (jbyte*)outputSer);
+    (*env)->SetObjectArrayElement(env, retArray, 0, pubArray);
+
+    intsByteArray = (*env)->NewByteArray(env, 2);
+    (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+    (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+    (void)classObject;
+
+    return retArray;
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1pubkey_1tweak_1add
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l, jint publen)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+/*  secp256k1_pubkey* pubkey = (secp256k1_pubkey*) (*env)->GetDirectBufferAddress(env, byteBufferObject);*/
+  unsigned char* pkey = (*env)->GetDirectBufferAddress(env, byteBufferObject);
+  const unsigned char* tweak = (unsigned char*) (pkey + publen);
+
+  jobjectArray retArray;
+  jbyteArray pubArray, intsByteArray;
+  unsigned char intsarray[2];
+  unsigned char outputSer[65];
+  size_t outputLen = 65;
+
+  secp256k1_pubkey pubkey;
+  int ret = secp256k1_ec_pubkey_parse(ctx, &pubkey, pkey, publen);
+
+  if( ret ) {
+    ret = secp256k1_ec_pubkey_tweak_add(ctx, &pubkey, tweak);
+  }
+
+  if( ret ) {
+    int ret2 = secp256k1_ec_pubkey_serialize(ctx,outputSer, &outputLen, &pubkey,SECP256K1_EC_UNCOMPRESSED );(void)ret2;
+  }
+
+  intsarray[0] = outputLen;
+  intsarray[1] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  pubArray = (*env)->NewByteArray(env, outputLen);
+  (*env)->SetByteArrayRegion(env, pubArray, 0, outputLen, (jbyte*)outputSer);
+  (*env)->SetObjectArrayElement(env, retArray, 0, pubArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 2);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1pubkey_1tweak_1mul
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l, jint publen)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  unsigned char* pkey = (*env)->GetDirectBufferAddress(env, byteBufferObject);
+  const unsigned char* tweak = (unsigned char*) (pkey + publen);
+
+  jobjectArray retArray;
+  jbyteArray pubArray, intsByteArray;
+  unsigned char intsarray[2];
+  unsigned char outputSer[65];
+  size_t outputLen = 65;
+
+  secp256k1_pubkey pubkey;
+  int ret = secp256k1_ec_pubkey_parse(ctx, &pubkey, pkey, publen);
+
+  if ( ret ) {
+    ret = secp256k1_ec_pubkey_tweak_mul(ctx, &pubkey, tweak);
+  }
+
+  if( ret ) {
+    int ret2 = secp256k1_ec_pubkey_serialize(ctx,outputSer, &outputLen, &pubkey,SECP256K1_EC_UNCOMPRESSED );(void)ret2;
+  }
+
+  intsarray[0] = outputLen;
+  intsarray[1] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  pubArray = (*env)->NewByteArray(env, outputLen);
+  (*env)->SetByteArrayRegion(env, pubArray, 0, outputLen, (jbyte*)outputSer);
+  (*env)->SetObjectArrayElement(env, retArray, 0, pubArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 2);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ec_1pubkey_1add
+(JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l, jint publen1, jint publen2)
+{
+    secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+    const unsigned char* pubdata1 = (*env)->GetDirectBufferAddress(env, byteBufferObject);
+    const unsigned char* pubdata2 = (const unsigned char*) (pubdata1 + publen1);
+    jobjectArray retArray;
+    jbyteArray pubArray, intsByteArray;
+    unsigned char intsarray[2];
+    secp256k1_pubkey pubkey1, pubkey2;
+    const secp256k1_pubkey *pubkeys[2];
+    unsigned char outputSer[65];
+    size_t outputLen = 65;
+
+    int ret = secp256k1_ec_pubkey_parse(ctx, &pubkey1, pubdata1, publen1);
+    if (ret) {
+        ret = secp256k1_ec_pubkey_parse(ctx, &pubkey2, pubdata2, publen2);
+    }
+    secp256k1_pubkey result;
+    if (ret) {
+        pubkeys[0] = &pubkey1;
+        pubkeys[1] = &pubkey2;
+        ret = secp256k1_ec_pubkey_combine(ctx, &result, pubkeys, 2);
+    }
+    if (ret) {
+        ret = secp256k1_ec_pubkey_serialize(ctx, outputSer, &outputLen, &result, SECP256K1_EC_UNCOMPRESSED );
+    }
+    intsarray[0] = outputLen;
+    intsarray[1] = ret;
+
+    retArray = (*env)->NewObjectArray(env, 2,
+      (*env)->FindClass(env, "[B"),
+      (*env)->NewByteArray(env, 1));
+
+    pubArray = (*env)->NewByteArray(env, outputLen);
+    (*env)->SetByteArrayRegion(env, pubArray, 0, outputLen, (jbyte*)outputSer);
+    (*env)->SetObjectArrayElement(env, retArray, 0, pubArray);
+
+    intsByteArray = (*env)->NewByteArray(env, 2);
+    (*env)->SetByteArrayRegion(env, intsByteArray, 0, 2, (jbyte*)intsarray);
+    (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+    (void)classObject;
+
+    return retArray;
+}
+
+SECP256K1_API jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdh
+  (JNIEnv* env, jclass classObject, jobject byteBufferObject, jlong ctx_l, jint publen)
+{
+  secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+  const unsigned char* secdata = (*env)->GetDirectBufferAddress(env, byteBufferObject);
+  const unsigned char* pubdata = (const unsigned char*) (secdata + 32);
+
+  jobjectArray retArray;
+  jbyteArray outArray, intsByteArray;
+  unsigned char intsarray[1];
+  secp256k1_pubkey pubkey;
+  unsigned char nonce_res[32];
+  size_t outputLen = 32;
+
+  int ret = secp256k1_ec_pubkey_parse(ctx, &pubkey, pubdata, publen);
+
+  if (ret) {
+    ret = secp256k1_ecdh(
+      ctx,
+      nonce_res,
+      &pubkey,
+      secdata,
+      NULL,
+      NULL
+    );
+  }
+
+  intsarray[0] = ret;
+
+  retArray = (*env)->NewObjectArray(env, 2,
+    (*env)->FindClass(env, "[B"),
+    (*env)->NewByteArray(env, 1));
+
+  outArray = (*env)->NewByteArray(env, outputLen);
+  (*env)->SetByteArrayRegion(env, outArray, 0, 32, (jbyte*)nonce_res);
+  (*env)->SetObjectArrayElement(env, retArray, 0, outArray);
+
+  intsByteArray = (*env)->NewByteArray(env, 1);
+  (*env)->SetByteArrayRegion(env, intsByteArray, 0, 1, (jbyte*)intsarray);
+  (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+  (void)classObject;
+
+  return retArray;
+}
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ecdsa_recover
+ * Signature: (Ljava/nio/ByteBuffer;JI)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdsa_1recover
+  (JNIEnv *env, jclass classObject, jobject byteBufferObject, jlong ctx_l, jint recid)
+{
+    secp256k1_context *ctx = (secp256k1_context*)(uintptr_t)ctx_l;
+    const unsigned char* sigdata = (*env)->GetDirectBufferAddress(env, byteBufferObject);
+    const unsigned char* msgdata = (const unsigned char*)(sigdata + 64);
+    secp256k1_ecdsa_recoverable_signature sig;
+    secp256k1_pubkey pub;
+    unsigned char outputSer[65];
+    size_t outputLen = 65;
+    jobjectArray retArray;
+    jbyteArray pubArray, intsByteArray;
+    unsigned char intsarray[1];
+
+    int ret = secp256k1_ecdsa_recoverable_signature_parse_compact(ctx, &sig, sigdata, recid);
+    if (ret) {
+        ret = secp256k1_ecdsa_recover(ctx, &pub, &sig, msgdata);
+        if (ret) {
+            ret = secp256k1_ec_pubkey_serialize(ctx, outputSer, &outputLen, &pub, SECP256K1_EC_UNCOMPRESSED );
+        }
+    }
+
+    intsarray[0] = ret;
+
+    retArray = (*env)->NewObjectArray(env, 2,
+      (*env)->FindClass(env, "[B"),
+      (*env)->NewByteArray(env, 1));
+
+    pubArray = (*env)->NewByteArray(env, outputLen);
+    (*env)->SetByteArrayRegion(env, pubArray, 0, outputLen, (jbyte*)outputSer);
+    (*env)->SetObjectArrayElement(env, retArray, 0, pubArray);
+
+    intsByteArray = (*env)->NewByteArray(env, 1);
+    (*env)->SetByteArrayRegion(env, intsByteArray, 0, 1, (jbyte*)intsarray);
+    (*env)->SetObjectArrayElement(env, retArray, 1, intsByteArray);
+
+    (void)classObject;
+
+    return retArray;
+}
+

native/jni/src/org_bitcoin_NativeSecp256k1.h

@@ -0,0 +1,157 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class org_bitcoin_NativeSecp256k1 */
+
+#ifndef _Included_org_bitcoin_NativeSecp256k1
+#define _Included_org_bitcoin_NativeSecp256k1
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ctx_clone
+ * Signature: (J)J
+ */
+JNIEXPORT jlong JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ctx_1clone
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_context_randomize
+ * Signature: (Ljava/nio/ByteBuffer;J)I
+ */
+JNIEXPORT jint JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1context_1randomize
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_privkey_negate
+ * Signature: (Ljava/nio/ByteBuffer;J)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1privkey_1negate
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_privkey_tweak_add
+ * Signature: (Ljava/nio/ByteBuffer;J)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1privkey_1tweak_1add
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_privkey_tweak_mul
+ * Signature: (Ljava/nio/ByteBuffer;J)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1privkey_1tweak_1mul
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_pubkey_negate
+ * Signature: (Ljava/nio/ByteBuffer;JI)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1pubkey_1negate
+  (JNIEnv *, jclass, jobject, jlong, jint);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_pubkey_tweak_add
+ * Signature: (Ljava/nio/ByteBuffer;JI)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1pubkey_1tweak_1add
+  (JNIEnv *, jclass, jobject, jlong, jint);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_pubkey_tweak_mul
+ * Signature: (Ljava/nio/ByteBuffer;JI)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1pubkey_1tweak_1mul
+  (JNIEnv *, jclass, jobject, jlong, jint);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_destroy_context
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1destroy_1context
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ecdsa_verify
+ * Signature: (Ljava/nio/ByteBuffer;JII)I
+ */
+JNIEXPORT jint JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdsa_1verify
+  (JNIEnv *, jclass, jobject, jlong, jint, jint);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ecdsa_sign
+ * Signature: (Ljava/nio/ByteBuffer;J)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdsa_1sign
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ecdsa_sign_compact
+ * Signature: (Ljava/nio/ByteBuffer;J)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdsa_1sign_1compact
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ec_seckey_verify
+ * Signature: (Ljava/nio/ByteBuffer;J)I
+ */
+JNIEXPORT jint JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ec_1seckey_1verify
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ec_pubkey_create
+ * Signature: (Ljava/nio/ByteBuffer;J)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ec_1pubkey_1create
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ec_pubkey_parse
+ * Signature: (Ljava/nio/ByteBuffer;JI)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ec_1pubkey_1parse
+  (JNIEnv *, jclass, jobject, jlong, jint);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ec_pubkey_add
+ * Signature: (Ljava/nio/ByteBuffer;JII)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ec_1pubkey_1add
+  (JNIEnv *, jclass, jobject, jlong, jint, jint);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ecdh
+ * Signature: (Ljava/nio/ByteBuffer;JI)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdh
+  (JNIEnv *, jclass, jobject, jlong, jint);
+
+/*
+ * Class:     org_bitcoin_NativeSecp256k1
+ * Method:    secp256k1_ecdsa_recover
+ * Signature: (Ljava/nio/ByteBuffer;JI)[[B
+ */
+JNIEXPORT jobjectArray JNICALL Java_org_bitcoin_NativeSecp256k1_secp256k1_1ecdsa_1recover
+  (JNIEnv *, jclass, jobject, jlong, jint);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

native/jni/src/org_bitcoin_Secp256k1Context.c

@@ -0,0 +1,15 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include "org_bitcoin_Secp256k1Context.h"
+#include "include/secp256k1.h"
+
+SECP256K1_API jlong JNICALL Java_org_bitcoin_Secp256k1Context_secp256k1_1init_1context
+  (JNIEnv* env, jclass classObject)
+{
+  secp256k1_context *ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);
+
+  (void)classObject;(void)env;
+
+  return (uintptr_t)ctx;
+}
+

native/jni/src/org_bitcoin_Secp256k1Context.h

@@ -0,0 +1,22 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+#include "include/secp256k1.h"
+/* Header for class org_bitcoin_Secp256k1Context */
+
+#ifndef _Included_org_bitcoin_Secp256k1Context
+#define _Included_org_bitcoin_Secp256k1Context
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     org_bitcoin_Secp256k1Context
+ * Method:    secp256k1_init_context
+ * Signature: ()J
+ */
+SECP256K1_API jlong JNICALL Java_org_bitcoin_Secp256k1Context_secp256k1_1init_1context
+  (JNIEnv *, jclass);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

native/xconfigure.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+
+#
+# Build for iOS 64bit-ARM variants and iOS Simulator
+# - Place the script at project root
+# - Customize MIN_IOS_VERSION and other flags as needed
+#
+# Test Environment
+# - macOS 10.14.6
+# - iOS 13.1
+# - Xcode 11.1
+#
+
+Build() {
+    # Ensure -fembed-bitcode builds, as workaround for libtool macOS bug
+    export MACOSX_DEPLOYMENT_TARGET="10.4"
+    # Get the correct toolchain for target platforms
+    export CC=$(xcrun --find --sdk "${SDK}" clang)
+    export CXX=$(xcrun --find --sdk "${SDK}" clang++)
+    export CPP=$(xcrun --find --sdk "${SDK}" cpp)
+    export CFLAGS="${HOST_FLAGS} ${OPT_FLAGS}"
+    export CXXFLAGS="${HOST_FLAGS} ${OPT_FLAGS}"
+    export LDFLAGS="${HOST_FLAGS}"
+
+    EXEC_PREFIX="${PLATFORMS}/${PLATFORM}"
+    ./configure \
+        --host="${CHOST}" \
+        --prefix="${PREFIX}" \
+        --exec-prefix="${EXEC_PREFIX}" \
+        --enable-static \
+        --disable-shared \
+        "$@"
+        # Avoid Xcode loading dylibs even when staticlibs exist
+
+    make clean
+    mkdir -p "${PLATFORMS}" &> /dev/null
+    make -j"${MAKE_JOBS}"
+    make install
+}
+
+echo "Cross building with configure args $@"
+
+# Locations
+ScriptDir="$( cd "$( dirname "$0" )" && pwd )"
+cd - &> /dev/null
+PREFIX="${ScriptDir}"/_build
+PLATFORMS="${PREFIX}"/platforms
+UNIVERSAL="${PREFIX}"/universal
+
+# Compiler options
+OPT_FLAGS="-O3 -g3 -fembed-bitcode"
+MAKE_JOBS=8
+MIN_IOS_VERSION=10.0
+
+# Build for platforms
+SDK="iphoneos"
+PLATFORM="arm"
+PLATFORM_ARM=${PLATFORM}
+ARCH_FLAGS="-arch arm64 -arch arm64e"  # -arch armv7 -arch armv7s
+HOST_FLAGS="${ARCH_FLAGS} -miphoneos-version-min=${MIN_IOS_VERSION} -isysroot $(xcrun --sdk ${SDK} --show-sdk-path)"
+CHOST="arm-apple-darwin"
+Build "$@"
+
+SDK="iphonesimulator"
+PLATFORM="x86_64-sim"
+PLATFORM_ISIM=${PLATFORM}
+ARCH_FLAGS="-arch x86_64"
+HOST_FLAGS="${ARCH_FLAGS} -mios-simulator-version-min=${MIN_IOS_VERSION} -isysroot $(xcrun --sdk ${SDK} --show-sdk-path)"
+CHOST="x86_64-apple-darwin"
+Build "$@"
+
+# Create universal binary
+cd "${PLATFORMS}/${PLATFORM_ARM}/lib"
+LIB_NAME=`find . -iname *.a`
+cd -
+mkdir -p "${UNIVERSAL}" &> /dev/null
+lipo -create -output "${UNIVERSAL}/${LIB_NAME}" "${PLATFORMS}/${PLATFORM_ARM}/lib/${LIB_NAME}" "${PLATFORMS}/${PLATFORM_ISIM}/lib/${LIB_NAME}"