Example usage for io.netty.util.internal PlatformDependent equalsConstantTime

Introduction

In this page you can find the example usage for io.netty.util.internal PlatformDependent equalsConstantTime.

Prototype

public static int equalsConstantTime(byte[] bytes1, int startPos1, byte[] bytes2, int startPos2, int length) 

Source Link

Document

Compare two byte arrays for equality without leaking timing information.

Usage

From source file:io.grpc.netty.GrpcHpackUtil.java

License:Apache License

/**
 * Compare two {@link CharSequence} objects without leaking timing information.
 * <p>/*from  ww  w.java 2  s  . c o m*/
 * The {@code int} return type is intentional and is designed to allow cascading of constant time operations:
 * <pre>
 *     String s1 = "foo";
 *     String s2 = "foo";
 *     String s3 = "foo";
 *     String s4 = "goo";
 *     boolean equals = (equalsConstantTime(s1, s2) & equalsConstantTime(s3, s4)) != 0;
 * </pre>
 * @param s1 the first value.
 * @param s2 the second value.
 * @return {@code 0} if not equal. {@code 1} if equal.
 */
static int equalsConstantTime(CharSequence s1, CharSequence s2) {
    if (s1 instanceof AsciiString && s2 instanceof AsciiString) {
        if (s1.length() != s2.length()) {
            return 0;
        }
        AsciiString s1Ascii = (AsciiString) s1;
        AsciiString s2Ascii = (AsciiString) s2;
        return PlatformDependent.equalsConstantTime(s1Ascii.array(), s1Ascii.arrayOffset(), s2Ascii.array(),
                s2Ascii.arrayOffset(), s1.length());
    }

    return ConstantTimeUtils.equalsConstantTime(s1, s2);
}

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