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<h2 title="Class SubtleUtil" class="title">Class SubtleUtil</h2>
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<pre>public final class <span class="typeNameLabel">SubtleUtil</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#androidApiLevel--">androidApiLevel</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Please reimplement this method in your code instead. From within Tink, use <code>Util.getAndroidApiLevel</code> directly.</span></div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html?is-external=true" title="class or interface in java.math">BigInteger</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#bytes2Integer-byte:A-">bytes2Integer</a></span>(byte[]&nbsp;bs)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#integer2Bytes-java.math.BigInteger-int-">integer2Bytes</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html?is-external=true" title="class or interface in java.math">BigInteger</a>&nbsp;num,
int&nbsp;intendedLength)</code>
<div class="block">Converts a nonnegative integer to a byte array of a specified length
(https://tools.ietf.org/html/rfc8017#section-4.2).</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#isAndroid--">isAndroid</a></span>()</code>
<div class="block">Best-effort checks that this is Android.</div>
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<td class="colFirst"><code>static byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#mgf1-byte:A-int-com.google.crypto.tink.subtle.Enums.HashType-">mgf1</a></span>(byte[]&nbsp;mgfSeed,
int&nbsp;maskLen,
<a href="../../../../../com/google/crypto/tink/subtle/Enums.HashType.html" title="enum in com.google.crypto.tink.subtle">Enums.HashType</a>&nbsp;mgfHash)</code>
<div class="block">Computes MGF1 as defined at https://tools.ietf.org/html/rfc8017#appendix-B.2.1.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#putAsUnsigedInt-java.nio.ByteBuffer-long-">putAsUnsigedInt</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;buffer,
long&nbsp;value)</code>
<div class="block">Inserts <code>value</code> as unsigned into into <code>buffer</code>.</div>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#toDigestAlgo-com.google.crypto.tink.subtle.Enums.HashType-">toDigestAlgo</a></span>(<a href="../../../../../com/google/crypto/tink/subtle/Enums.HashType.html" title="enum in com.google.crypto.tink.subtle">Enums.HashType</a>&nbsp;hash)</code>
<div class="block">Returns the digest algorithm name corresponding to a hash type.</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#toEcdsaAlgo-com.google.crypto.tink.subtle.Enums.HashType-">toEcdsaAlgo</a></span>(<a href="../../../../../com/google/crypto/tink/subtle/Enums.HashType.html" title="enum in com.google.crypto.tink.subtle">Enums.HashType</a>&nbsp;hash)</code>
<div class="block">Returns the Ecdsa algorithm name corresponding to a hash type.</div>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/google/crypto/tink/subtle/SubtleUtil.html#toRsaSsaPkcs1Algo-com.google.crypto.tink.subtle.Enums.HashType-">toRsaSsaPkcs1Algo</a></span>(<a href="../../../../../com/google/crypto/tink/subtle/Enums.HashType.html" title="enum in com.google.crypto.tink.subtle">Enums.HashType</a>&nbsp;hash)</code>
<div class="block">Returns the RSA SSA (Signature with Appendix) PKCS1 algorithm name corresponding to a hash
type.</div>
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<h4>toEcdsaAlgo</h4>
<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toEcdsaAlgo(<a href="../../../../../com/google/crypto/tink/subtle/Enums.HashType.html" title="enum in com.google.crypto.tink.subtle">Enums.HashType</a>&nbsp;hash)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></pre>
<div class="block">Returns the Ecdsa algorithm name corresponding to a hash type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>hash</code> - the hash type</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the JCE's Ecdsa algorithm name for the hash.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></code></dd>
</dl>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toRsaSsaPkcs1Algo(<a href="../../../../../com/google/crypto/tink/subtle/Enums.HashType.html" title="enum in com.google.crypto.tink.subtle">Enums.HashType</a>&nbsp;hash)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></pre>
<div class="block">Returns the RSA SSA (Signature with Appendix) PKCS1 algorithm name corresponding to a hash
type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>hash</code> - the hash type.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the JCE's RSA SSA PKCS1 algorithm name for the hash.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></code></dd>
</dl>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toDigestAlgo(<a href="../../../../../com/google/crypto/tink/subtle/Enums.HashType.html" title="enum in com.google.crypto.tink.subtle">Enums.HashType</a>&nbsp;hash)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></pre>
<div class="block">Returns the digest algorithm name corresponding to a hash type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>hash</code> - the hash type.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>theh JCE's hash algorithm name.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></code></dd>
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<pre>public static&nbsp;boolean&nbsp;isAndroid()</pre>
<div class="block">Best-effort checks that this is Android.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if running on Android.</dd>
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<h4>androidApiLevel</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public static&nbsp;int&nbsp;androidApiLevel()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Please reimplement this method in your code instead. From within Tink, use <code>Util.getAndroidApiLevel</code> directly.</span></div>
<div class="block">Returns the Android API level or -1 if Tink isn't running on Android.</div>
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<pre>@InlineMe(replacement="BigIntegerEncoding.fromUnsignedBigEndianBytes(bs)",
imports="com.google.crypto.tink.internal.BigIntegerEncoding")
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html?is-external=true" title="class or interface in java.math">BigInteger</a>&nbsp;bytes2Integer(byte[]&nbsp;bs)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Converts an unsigned, big-endian encoded byte array to a non-negative integer
(https://tools.ietf.org/html/rfc8017#section-4.1).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>bs</code> - the byte array to be converted to integer.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the corresponding integer.</dd>
</dl>
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<h4>integer2Bytes</h4>
<pre>public static&nbsp;byte[]&nbsp;integer2Bytes(<a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html?is-external=true" title="class or interface in java.math">BigInteger</a>&nbsp;num,
int&nbsp;intendedLength)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></pre>
<div class="block">Converts a nonnegative integer to a byte array of a specified length
(https://tools.ietf.org/html/rfc8017#section-4.2).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>num</code> - nonnegative integer to be converted.</dd>
<dd><code>intendedLength</code> - intended length of the resulting integer.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the corresponding byte array of length <code>intendedLength</code>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></code></dd>
</dl>
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<h4>mgf1</h4>
<pre>public static&nbsp;byte[]&nbsp;mgf1(byte[]&nbsp;mgfSeed,
int&nbsp;maskLen,
<a href="../../../../../com/google/crypto/tink/subtle/Enums.HashType.html" title="enum in com.google.crypto.tink.subtle">Enums.HashType</a>&nbsp;mgfHash)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></pre>
<div class="block">Computes MGF1 as defined at https://tools.ietf.org/html/rfc8017#appendix-B.2.1.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></code></dd>
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<pre>public static&nbsp;void&nbsp;putAsUnsigedInt(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;buffer,
long&nbsp;value)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></pre>
<div class="block">Inserts <code>value</code> as unsigned into into <code>buffer</code>.
<p>@throws GeneralSecurityException if not 0 <= value < 2^32.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/security/GeneralSecurityException.html?is-external=true" title="class or interface in java.security">GeneralSecurityException</a></code></dd>
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