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<div class="title">NativeSecp256k1.java</div> </div>
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<a href="NativeSecp256k1_8java.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"><a class="line" href="namespaceorg_1_1bitcoin.html"> 1</a></span> <span class="keyword">package </span>org.bitcoin;</div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="keyword">import</span> java.nio.ByteBuffer;</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="keyword">import</span> java.nio.ByteOrder;</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="keyword">import</span> com.google.common.base.Preconditions;</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00014"></a><span class="lineno"><a class="line" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html"> 14</a></span> <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html">NativeSecp256k1</a> {</div><div class="line"><a name="l00015"></a><span class="lineno"><a class="line" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a52e69585bc6f643505a508812f566a7d"> 15</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keywordtype">boolean</span> <a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a52e69585bc6f643505a508812f566a7d">enabled</a>;</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  <span class="keyword">static</span> {</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keywordtype">boolean</span> isEnabled = <span class="keyword">true</span>;</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordflow">try</span> {</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  System.loadLibrary(<span class="stringliteral">"javasecp256k1"</span>);</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  } <span class="keywordflow">catch</span> (UnsatisfiedLinkError e) {</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  isEnabled = <span class="keyword">false</span>;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  }</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a52e69585bc6f643505a508812f566a7d">enabled</a> = isEnabled;</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  }</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  </div><div class="line"><a name="l00026"></a><span class="lineno"><a class="line" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a709957178cded2ef778ce97a83b78e51"> 26</a></span>  <span class="keyword">private</span> <span class="keyword">static</span> ThreadLocal<ByteBuffer> <a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a709957178cded2ef778ce97a83b78e51">nativeECDSABuffer</a> = <span class="keyword">new</span> ThreadLocal<ByteBuffer>();</div><div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a7ff9dbab59c8cff4ce489651f045cd0a"> 35</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">boolean</span> <a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a7ff9dbab59c8cff4ce489651f045cd0a">verify</a>(byte[] <a class="code" href="namespacegen__base58__test__vectors.html#a8d12b07536a476098e3d74b6a79dfc9a">data</a>, byte[] signature, byte[] pub) {</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  Preconditions.checkArgument(<a class="code" href="namespacegen__base58__test__vectors.html#a8d12b07536a476098e3d74b6a79dfc9a">data</a>.length == 32 && signature.length <= 520 && pub.length <= 520);</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  ByteBuffer byteBuff = <a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a709957178cded2ef778ce97a83b78e51">nativeECDSABuffer</a>.get();</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (byteBuff == null) {</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  byteBuff = ByteBuffer.allocateDirect(32 + 8 + 520 + 520);</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  byteBuff.order(ByteOrder.nativeOrder());</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a709957178cded2ef778ce97a83b78e51">nativeECDSABuffer</a>.set(byteBuff);</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  }</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  byteBuff.rewind();</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  byteBuff.put(<a class="code" href="namespacegen__base58__test__vectors.html#a8d12b07536a476098e3d74b6a79dfc9a">data</a>);</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  byteBuff.putInt(signature.length);</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  byteBuff.putInt(pub.length);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  byteBuff.put(signature);</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  byteBuff.put(pub);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> <a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a4e17ade799de36b0b823d0de80b78fad">secp256k1_ecdsa_verify</a>(byteBuff) == 1;</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  }</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keyword">private</span> <span class="keyword">static</span> native <span class="keywordtype">int</span> <a class="code" href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a4e17ade799de36b0b823d0de80b78fad">secp256k1_ecdsa_verify</a>(ByteBuffer byteBuff);</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> }</div><div class="ttc" id="classorg_1_1bitcoin_1_1NativeSecp256k1_html_a709957178cded2ef778ce97a83b78e51"><div class="ttname"><a href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a709957178cded2ef778ce97a83b78e51">org.bitcoin.NativeSecp256k1.nativeECDSABuffer</a></div><div class="ttdeci">static ThreadLocal< ByteBuffer > nativeECDSABuffer</div><div class="ttdef"><b>Definition:</b> <a href="NativeSecp256k1_8java_source.html#l00026">NativeSecp256k1.java:26</a></div></div>
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<div class="ttc" id="classorg_1_1bitcoin_1_1NativeSecp256k1_html"><div class="ttname"><a href="classorg_1_1bitcoin_1_1NativeSecp256k1.html">org.bitcoin.NativeSecp256k1</a></div><div class="ttdef"><b>Definition:</b> <a href="NativeSecp256k1_8java_source.html#l00014">NativeSecp256k1.java:14</a></div></div>
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<div class="ttc" id="classorg_1_1bitcoin_1_1NativeSecp256k1_html_a52e69585bc6f643505a508812f566a7d"><div class="ttname"><a href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a52e69585bc6f643505a508812f566a7d">org.bitcoin.NativeSecp256k1.enabled</a></div><div class="ttdeci">static final boolean enabled</div><div class="ttdef"><b>Definition:</b> <a href="NativeSecp256k1_8java_source.html#l00015">NativeSecp256k1.java:15</a></div></div>
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<div class="ttc" id="namespacegen__base58__test__vectors_html_a8d12b07536a476098e3d74b6a79dfc9a"><div class="ttname"><a href="namespacegen__base58__test__vectors.html#a8d12b07536a476098e3d74b6a79dfc9a">gen_base58_test_vectors.data</a></div><div class="ttdeci">data</div><div class="ttdef"><b>Definition:</b> <a href="gen__base58__test__vectors_8py_source.html#l00123">gen_base58_test_vectors.py:123</a></div></div>
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<div class="ttc" id="classorg_1_1bitcoin_1_1NativeSecp256k1_html_a7ff9dbab59c8cff4ce489651f045cd0a"><div class="ttname"><a href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a7ff9dbab59c8cff4ce489651f045cd0a">org.bitcoin.NativeSecp256k1.verify</a></div><div class="ttdeci">static boolean verify(byte[] data, byte[] signature, byte[] pub)</div><div class="ttdef"><b>Definition:</b> <a href="NativeSecp256k1_8java_source.html#l00035">NativeSecp256k1.java:35</a></div></div>
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<div class="ttc" id="classorg_1_1bitcoin_1_1NativeSecp256k1_html_a4e17ade799de36b0b823d0de80b78fad"><div class="ttname"><a href="classorg_1_1bitcoin_1_1NativeSecp256k1.html#a4e17ade799de36b0b823d0de80b78fad">org.bitcoin.NativeSecp256k1.secp256k1_ecdsa_verify</a></div><div class="ttdeci">static native int secp256k1_ecdsa_verify(ByteBuffer byteBuff)</div></div>
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