400 Error digest_mismatch - File digest incorrect when committing chunked upload

I'm attempting to commit my session after I've uploaded all my file parts during a chunked upload session.

I'm getting back this error code:

[400 | 3938541613981df8929c15ab61e2c5b5] digest_mismatch - File digest was incorrect. Actual: J7tfRToRJhmT6BJAd46yQdUnS8U= Expected: n4AP7nqEWHxl1YeBizv4nh8yWRI=

for my digest I'm using

MessageDigest digest = null;
try {
digest = MessageDigest.getInstance("SHA1");
} catch (NoSuchAlgorithmException ae) {
throw new BoxAPIException("Digest algorithm not found", ae);
}

DigestInputStream dis = new DigestInputStream(stream, digest);

I upload my DigestInputStream in a loop with: session.uploadParts(dis, offset, partSize, fileSize);

Once loop is finished I create my file hash:

byte[] digestBytes = digest.digest();

Base64 encode the hash to a String with java.util.Base64

String digestStr = Base64.getEncoder().encodeToString(digestBytes);

commit the session

BoxFile.Info newFileInfo = session.commit(digestStr, parts, null, null, null);

Am I creating/encoding my digest wrong? How do I match what is expected from the Box Servers?

Thanks for your help

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