How to check if a file uploaded to AWS S3 has the same content as a local file

We believe that the S3 checksum is useless for huge files larger than 1GB, as it is a further hashed value of chunks separated by an arbitrary number of bytes.

There is a 1 GB file uploaded to AWS S3. The SHA256 checksum value is "o9mK1Ay32kIpvW157S40b/2siazR/+tpuz6OYCsjNBU=-2620".

Is there any way to verify that the file locally and the file uploaded to S3 are identical in content? Without downloading of course.

I am hoping to use the AWS SDK or cli to calculate the same checksum value from the local file

I was able to get all hash values per chunk with the get-object-attributes command. The byte counts are explicitly listed, so I assume they are complete.

[cloudshell-user ~]$ aws s3api get-object-attributes --bucket xxx --key "xxx.bin"    --object-attributes "Checksum,ObjectParts"
{
    "LastModified": "2024-07-10T20:56:50+00:00",
    "Checksum": {
        "ChecksumSHA256": "ZQHQKvGsIHCdKb9APtdkmY4RH/FwucuznEoShkrEPsw="
    },
    "ObjectParts": {
        "TotalPartsCount": 3106,
        "PartNumberMarker": 0,
        "NextPartNumberMarker": 1000,
        "MaxParts": 1000,
        "IsTruncated": true,
        "Parts": [
            {
                "PartNumber": 1,
                "Size": 5242880,
                "ChecksumSHA256": "nkyKW7CVp1UjpQX66AHwRp3tMTJmpguNoyz+S5lcwt8="
            },
略