Checksum and hash utilities.md

Checksum and hash utilities

Checksum tools

MD5 (Message digest algorithm)

md5

SHA 1/256/512 (Secure hash Algorithm)

shasum
shasum -a 256
shasum -a 512

File usage

md5 <file>
shasum <file>
cat <file> | md5
cat <file> | shasum

String input usage

echo <string> | md5
echo <string> | shasum

Cyclic redundancy tools

CRC (Cyclic redundancy check)

crc32 <file>

Securely generate a hash locally from text input

• Allows using command line to generate hash without logging input to shell history
• Replace shasum with any of the checksum variants to generate the required hash

Bash version

read -sp 'Input: ' input; echo; echo -n 'Output: '; echo -n "$input" | shasum; unset input

Fish version

read -sP 'Input: ' input; echo -n 'Output: '; echo -n "$input" | shasum; set -e input