ISBN-10 / ISBN-13 Validator
Validate ISBN-10 and ISBN-13 check digits and convert between the two formats.
Related
/etc/passwd & shadow Parser
Parse and explain Unix passwd and shadow file lines field by field.
Crypto & Hash
ABA Routing Number Validator
Validate a US bank ABA/routing transit number using its mod-10 checksum.
Crypto & Hash
Adler-32 Checksum
Compute the Adler-32 checksum of text or a file, as used by zlib.
Crypto & Hash
AES Encrypt / Decrypt
Encrypt and decrypt text with AES-GCM using a passphrase, producing self-contained Base64 output with embedded salt and IV.
Crypto & Hash