I am uploading a file to S3 using Java - this is what I got so far:
AmazonS3 s3 = new AmazonS3Client(new BasicAWSCredentials(\"XX\",\"YY\"));
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Because the original question was never answered, and I had to run into this same problem, the solution for the MD5 problem is that S3 doesn't want the Hex encoded MD5 string we normally think about.
Instead, I had to do this.
// content is a passed in InputStream
byte[] resultByte = DigestUtils.md5(content);
String streamMD5 = new String(Base64.encodeBase64(resultByte));
metaData.setContentMD5(streamMD5);
Essentially what they want for the MD5 value is the Base64 encoded raw MD5 byte-array, not the Hex string. When I switched to this it started working great for me.