# libtom/libtomcrypt

LibTomCrypt is a fairly comprehensive, modular and portable cryptographic toolkit that provides developers with a vast array of well known published block ciphers, one-way hash functions, chaining modes, pseudo-random number generators, public key cryptography and a plethora of other routines.

Repository: https://github.com/libtom/libtomcrypt
Canonical: https://ross.abutalabs.com/products/libtomcrypt
Homepage: https://www.libtom.net
Language: C
License: NOASSERTION
License Family: other
Topics: libtomcrypt, cryptography, c, encryption
Last push: 2026-08-08T15:05:13+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 96, release rhythm 8, longevity 100
- inputs: {"age_days": 5893, "days_push": 25, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1788, forks 493 (observed 2026-08-28T04:05:36.327664+00:00)

## What it is
LibTomCrypt is a comprehensive, modular and portable cryptographic toolkit written in C, providing block ciphers, hash functions, chaining modes, PRNGs, and public key cryptography. It is permissively licensed (WTFPL/Unlicense) and well documented, serving both production use and cryptographic education.

## Use cases
- add encryption to a C application
- implement AES or other block ciphers in portable C
- compute hash functions like SHA-2 in my project
- do public key cryptography without licensing restrictions
- embed a lightweight crypto library in an embedded device
- learn how cryptographic algorithms are implemented

## When to choose
- you need a portable, permissively licensed C crypto library
- you want modular builds with configurable feature sets
- you need a wide range of ciphers, hashes, and public key primitives in one toolkit
- you want readable, well-commented crypto source for learning

## When to avoid
- you need a high-level, misuse-resistant API rather than raw primitives
- you require formal certification like FIPS validation
- you work in a language with native crypto ecosystems (Python, Go, etc.)
- you need constant-time guarantees audited for side-channel resistance in hostile environments

## Facets
- artifact type: library
- maturity: stable
- function: cryptography, security, developer-tools
- domain: security, developer-tools, cross-platform
- platform: c, cross-platform, windows, embedded
- tags: block-ciphers, hash-functions, public-key-cryptography, portable-c, crypto-toolkit, linux, macos

## Member repositories
- libtom/libtomcrypt (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:36.327664+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:23:27.206822+00:00, confidence not recorded.
  - readme: https://github.com/libtom/libtomcrypt (fetched 2026-08-28T04:05:36.327664+00:00, sha 729d18445114)
  - homepage: https://www.libtom.net (fetched 2026-08-29T11:02:16.831566+00:00, sha b1689e7d5fff)
  - site_page: https://www.libtom.net/about (fetched 2026-08-29T11:02:16.840720+00:00, sha a903465bedf4)
- Data as of 2026-08-30T08:39:29.467469+00:00.