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Use CRC32C checksum instead of Adler32 to reduce the chance of collision

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This commit is contained in:
Artur Barashev 2026-01-22 11:15:56 -05:00
parent c859eb3969
commit 7dad5f1be9
1 changed files with 5 additions and 5 deletions
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10
src/java.base/share/classes/sun/security/ssl/CompressionAlgorithm.java
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@ -32,7 +32,7 @@ import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.zip.Adler32;
import java.util.zip.CRC32C;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
@ -201,10 +201,10 @@ enum CompressionAlgorithm {
// Fast checksum.
private static long getChecksum(byte[] input) {
Adler32 adler32 = new Adler32();
adler32.update(input);
// The upper 32 bits are not used in the long returned by Adler32,
CRC32C crc32c = new CRC32C();
crc32c.update(input);
// The upper 32 bits are not used in the long returned by CRC32C,
// place input's length there to reduce the chance of collision.
return adler32.getValue() | (long) input.length << 32;
return crc32c.getValue() | (long) input.length << 32;
}
}