RHash is a console utility for calculation and verification of magnet links and a wide range of hash sums like CRC32, MD4, MD5, SHA1, SHA256, SHA512, SHA3, AICH, ED2K, Tiger, DC++ TTH, BitTorrent BTIH, GOST R 34.11-94, RIPEMD-160, HAS-160, EDON-R, Whirlpool and Snefru.

The libdecaf library is an implementation of elliptic curve cryptography using the Montgomery and Edwards curves Curve25519, Ed25519, Ed448-Goldilocks and Curve448, using the Decaf encoding.

Optimized C library for cryptographic operations on curve secp256k1.

This library is used for consensus critical cryptographic operations on the Bitcoin Cash network.

Features:

• secp256k1 ECDSA signing/verification and key generation.

• secp256k1 Schnorr signing/verification (Bitcoin Cash Schnorr variant).

• Additive and multiplicative tweaking of secret/public keys.

• Serialization/parsing of secret keys, public keys, signatures.

• Constant time, constant memory access signing and pubkey generation.

• Derandomized ECDSA (via RFC6979 or with a caller provided function).

• Very efficient implementation.

• Suitable for embedded systems.

• Optional module for public key recovery.

• Optional module for ECDH key exchange (experimental).

• Optional module for multiset hash (experimental).

This package provides a cryptographic hash function that is fast, secure, parallelizable, capable of incremental updates.

mkp224o generates valid ed25519 (hidden service version 3) onion addresses. It allows one to produce customized vanity .onion addresses using a brute-force method.

Crypto++ is a C++ class library of cryptographic schemes.

libb2 is a portable implementation of the BLAKE2 family of cryptographic hash functions. It includes optimised implementations for IA-32 and AMD64 processors, and an interface layer that automatically selects the best implementation for the processor it is run on.

BLAKE2 (RFC 7693) is a family of high-speed cryptographic hash functions that are faster than MD5, SHA-1, SHA-2, and SHA-3, yet are at least as secure as the latest standard, SHA-3. It is an improved version of the SHA-3 finalist BLAKE.

Minisign is a dead simple tool to sign files and verify signatures. It is portable, lightweight, and uses the highly secure Ed25519 public-key signature system. Signature written by minisign can be verified using OpenBSD's signify tool: public key files and signature files are compatible. However, minisign uses a slightly different format to store secret keys. Minisign signatures include trusted comments in addition to untrusted comments. Trusted comments are signed, thus verified, before being displayed.

Optimized C library for EC operations on curve secp256k1.

Features:

• secp256k1 ECDSA signing/verification and key generation.

• Additive and multiplicative tweaking of secret/public keys.

• Serialization/parsing of private keys, public keys, signatures.

• Constant time, constant memory access signing and public key generation.

• Derandomized ECDSA (via RFC6979 or with a caller provided function.)

• Very efficient implementation.

• Suitable for embedded systems.

• No runtime dependencies.

• Optional module for public key recovery.

• Optional module for ECDH key exchange.

• Optional module for Schnorr signatures according to BIP-340.

The Olm library implements the Double Ratchet cryptographic ratchet. This package contains its Python bindings.

libxcrypt is a modern library for one-way hashing of passwords. It supports a wide variety of both modern and historical hashing methods: yescrypt, gost-yescrypt, scrypt, bcrypt, sha512crypt, sha256crypt, md5crypt, SunMD5, sha1crypt, NT, bsdicrypt, bigcrypt, and descrypt.

hash_extender is a utility for performing hash length extension attacks supporting MD4, MD5, RIPEMD-160, SHA-0, SHA-1, SHA-256, SHA-512, and WHIRLPOOL hashes.

This package provides architecture-specific implementations of the CRC32C algorithm, which is specified in RFC 3720, section 12.1.

libscrypt implements scrypt key derivation function. It is designed to be far more secure against hardware brute-force attacks than alternative functions such as PBKDF2 or bcrypt.

Keychain is usually run from shell profiles like ~/.bash_profile, but it is also possible to use it with non-interactive shells. It works with various operating systems (including GNU/Linux and HURD) and shells (like bourne-compatible, csh-compatible and fish shells). By default Keychain will only start ssh-agent, but it can also be configured to start gpg-agent.

The currently provided message digest algorithms are:

• MD2

• MD4

• MD5

• RIPEMD-160

• SHA-1

• SHA-2 (SHA-256, SHA-384 and SHA-512)

The Olm library implements the Double Ratchet cryptographic ratchet. It is written in C and C++11, and exposed as a C API.

Keyutils is a set of utilities for managing the key retention facility in the Linux kernel, which can be used by file systems, block devices, and more to gain and retain the authorization and encryption keys required to perform secure operations.

This package provides a simple password-based encryption utility as a demonstration of the scrypt key derivation function. Scrypt is designed to be far more resistant against hardware brute-force attacks than alternative functions such as PBKDF2 or bcrypt.

Cryptsetup is a utility used to conveniently set up disk encryption based on the dm-crypt Linux kernel module. It is most often used to manage LUKS volumes but also supports plain dm-crypt volumes and loop-AES, TrueCrypt (including VeraCrypt extension), and BitLocker formats.

LUKS is the standard for hard disk encryption with the kernel Linux. It provides a standard on-disk-format compatible amongst distributions as well as secure management of multiple user passwords. LUKS stores all necessary setup information in the partition header to facilitate data transport and migration.

The package also includes the veritysetup and integritysetup utilities to conveniently configure the dm-verity and dm-integrity block integrity kernel modules.

Cryptsetup is a utility used to conveniently set up disk encryption based on the dm-crypt Linux kernel module. It is most often used to manage LUKS volumes but also supports plain dm-crypt volumes and loop-AES, TrueCrypt (including VeraCrypt extension), and BitLocker formats.

LUKS is the standard for hard disk encryption with the kernel Linux. It provides a standard on-disk-format compatible amongst distributions as well as secure management of multiple user passwords. LUKS stores all necessary setup information in the partition header to facilitate data transport and migration.

The package also includes the veritysetup and integritysetup utilities to conveniently configure the dm-verity and dm-integrity block integrity kernel modules.

Cryptsetup is a utility used to conveniently set up disk encryption based on the dm-crypt Linux kernel module. It is most often used to manage LUKS volumes but also supports plain dm-crypt volumes and loop-AES, TrueCrypt (including VeraCrypt extension), and BitLocker formats.

LUKS is the standard for hard disk encryption with the kernel Linux. It provides a standard on-disk-format compatible amongst distributions as well as secure management of multiple user passwords. LUKS stores all necessary setup information in the partition header to facilitate data transport and migration.

The package also includes the veritysetup and integritysetup utilities to conveniently configure the dm-verity and dm-integrity block integrity kernel modules.

foo2zjs is a printer driver for printers that use the Zenographics ZjStream wire protocol for their print data, often erroneously referred to as winprinters or GDI printers.

It supports Minolta/QMS Magicolor, Minolta Color PageWorks/Pro, HP LaserJet, and possibly other printers. See README for details.

CUPS is a printing system that uses IPP to talk to printers and network clients. It also provides the old lp and lpr commands, a Web interface, and a C programming interface to manage printers and print jobs.

CUPS can print to both local (USB, serial, even parallel) and networked printers. Almost any modern printer supports IPP Everywhere, sometimes sold as AirPrint, and is supported out of the box. Older printers can be supported through legacy PPD-based printer drivers called ``printer applications''. These must be installed separately.