md5.update(ipad);
        md5.update(data);
        byte[] innerHash = md5.digest();

        md5.reset();
        md5.update(opad);
        md5.update(innerHash);
        byte[] expected = md5.digest();

        try (MockedStatic<Crypto> mockedCrypto = mockStatic(Crypto.class)) {
            mockedCrypto.when(Crypto::getMD5).thenReturn(MessageDigest.getInstance("MD5"));

            HMACT64 hmac = new HMACT64(key);

        final byte[] digest = md5.digest();
        md5.update(opad);
        return md5.digest(digest);
    }

    @Override
    protected int engineDigest(final byte[] buf, final int offset, final int len) {
        final byte[] digest = md5.digest();
        md5.update(opad);
        md5.update(digest);
        try {
            return md5.digest(buf, offset, len);
        } catch (final Exception ex) {

// when the object is uploaded in multiple parts via the S3
// multipart API. Instead, S3 first computes a MD5 of each part:
//
//	 e1 := MD5(part-1)
//	 e2 := MD5(part-2)
//	...
//	 eN := MD5(part-N)
//
// Then, the ETag of the object is computed as MD5 of all individual
// part checksums. S3 also encodes the number of parts into the ETag
// by appending a -<number-of-parts> at the end:
//

        final byte[] digest = this.md5.digest();
        this.md5.update(this.opad);
        return this.md5.digest(digest);
    }

    @Override
    protected int engineDigest(final byte[] buf, final int offset, final int len) {
        final byte[] digest = this.md5.digest();
        this.md5.update(this.opad);
        this.md5.update(digest);
        try {
            return this.md5.digest(buf, offset, len);

./mc mb site1/testbucket/
./mc cp -r --quiet /usr/bin site1/testbucket/

sleep 5

./s3-check-md5 -h

failed_count_site1=$(./s3-check-md5 -versions -access-key minioadmin -secret-key minioadmin -endpoint http://site1-nginx:9001 -bucket testbucket 2>&1 | grep FAILED | wc -l)

.vscode/
*.tar.bz2
parts/
prime/
stage/
.sia_temp/
config.json
node_modules/
mc.*
s3-check-md5*
xl-meta*
healing-*
inspect*.zip
200M*
hash-set
minio.RELEASE*
mc
nancy
inspects/*
.bin/
*.gz
docs/debugging/s3-verify/s3-verify
docs/debugging/xl-meta/xl-meta
docs/debugging/s3-check-md5/s3-check-md5
docs/debugging/hash-set/hash-set
docs/debugging/healing-bin/healing-bin
docs/debugging/inspect/inspect

# Check the MD5 checksums of encrypted objects from source and target
if [ "${src_obj1_md5}" != "${rep_obj1_md5}" ]; then
	echo "BUG: MD5 checksum of object 'minio2/test-bucket/encrypted' doesn't match with source. Expected: '${src_obj1_md5}', Found: '${rep_obj1_md5}'"
	exit_1
fi
if [ "${src_obj2_md5}" != "${rep_obj2_md5}" ]; then

// Reader implements the Tagger interface.
type Reader struct {
	src io.Reader

	md5      hash.Hash
	checksum ETag

	readN int64
}

// NewReader returns a new Reader that computes the
// MD5 checksum of the content read from r as ETag.
//
// If the provided etag is not nil the returned
// Reader compares the etag with the computed
// MD5 sum once the r returns io.EOF.

	{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="}}, Expected: true},                 // 3
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{""},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{""},
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{""},
		},
		Expected: true,
	}, // 4
	{

    verifyNoMoreInteractions(hashFunction, hasher);
  }

  public void testHash_hashesCorrectly() throws Exception {
    HashCode expectedHash = Hashing.md5().hashBytes(testBytes);
    HashingInputStream in = new HashingInputStream(Hashing.md5(), buffer);

    byte[] buf = new byte[4];
    int numOfByteRead = in.read(buf, 0, buf.length);
    assertEquals(4, numOfByteRead);