Top "Checksum" questions

A checksum or hash sum is a fixed-size datum computed from an arbitrary block of digital data for the purpose of detecting accidental errors that may have been introduced during its transmission or storage.

CCITT CRC 16 Bit Start Value 0xffff

I need to calculate a CCITT 16 bit checksum value for data passed as a parameter together with the length. If …

c++ checksum crc crc16
How to perform checksums during a SFTP file transfer for data integrity?

I have a requirement to perform checksum (for data integrity) for SFTP. I was hoping this could be done during …

sftp checksum data-integrity
How to calculate crc32 checksum from a string on linux bash

I used crc32 to calculate checkcums from sting long time ago, but I cannot remember how I did it. echo …

bash checksum crc32
Checksum verification in Hadoop

Do we need to verify checksum after we move files to Hadoop (HDFS) from a Linux server through a Webhdfs ? …

hadoop hdfs checksum
How to get the SHA-1/MD5 checksum of a file with Qt?

Is there a way to get the MD5 or SHA-1 checksum/hash of a file on disk in Qt? For …

c++ qt hash checksum
Can a TCP checksum fail to detect an error? If yes, how is this dealt with?

If a TCP payload gets corrupted in transit the recomputed checksum won't match the transmitted checksum. Great, all fine so …

networking tcp checksum
CRC32 vs CRC32C?

What is the difference of CRC32 and CRC32C? I know CRC32 for a long time, but just heard CRC32…

hash checksum
Encrypting SQLite Database file in iPhone OS

Any SQLite database on the iPhone is simply a file bundled with the application. It is relatively simple for anyone …

iphone sqlite ios encryption checksum
Get a file SHA256 Hash code and Checksum

Previously I asked a question about combining SHA1+MD5 but after that I understand calculating SHA1 and then MD5 of …

c# mono hashcode checksum sha256
How to calculate the internet checksum from a byte[] in Java

I'm trying to figure out how to calculate the Internet Checksum in Java and its causing me no end of …

java checksum ip-protocol