Install libgcrypt with Homebrew

Project links

• Homepage

Commands and aliases

• dumpsexp
• hmac256
• libgcrypt-config
• mpicalc

Project history

The GnuPG project describes Libgcrypt as a general-purpose cryptographic library originally based on GnuPG code. GnuPG news and release material show the library becoming a separately versioned component by the early 2000s, with a 2003 alpha-series announcement for Libgcrypt 1.1.42 and later 1.2.x, 1.4.x, 1.5.x, 1.7.x, 1.8.x, 1.10.x, and 1.12.x release lines.

Its scope grew from the cryptographic code needed by GnuPG into a broad primitive library covering symmetric ciphers, hashes, MACs, public-key algorithms, multi-precision integers, random-number generation, S-expressions, FIPS-related behavior, and helper tools. The project page also records a packaging-relevant compatibility policy: Libgcrypt versions since 1.2 keep API and ABI compatibility.

Adoption history

Libgcrypt's adoption follows GnuPG's split-library architecture: GnuPG and related projects can share a maintained cryptographic core while packagers ship it as an independent system library. Homebrew, Linux distributions, Nix, MacPorts, and other package managers expose it as a separate package because many consumers need the library without installing or rebuilding the whole GnuPG stack.

The GnuPG release stream treats Libgcrypt security updates as first-class events. Multiple GnuPG news entries call out Libgcrypt releases for side-channel fixes, stable-branch compatibility, new algorithms, and random-number-generator work, which is why downstream maintainers track it closely.

How it is used

Developers link against Libgcrypt when they need a C API for cryptographic primitives, MPI arithmetic, random bytes, or S-expression-based public-key operations. The command-line helpers packaged with it, such as hmac256 and mpicalc, are secondary to the library but useful for testing and small operational tasks.

The library intentionally does not provide a complete OpenPGP protocol implementation; it supplies lower-level cryptographic operations. That boundary is important for users choosing between Libgcrypt, GPGME, and the GnuPG command-line tools.

Why package nerds care

For package maintainers, Libgcrypt is a classic shared-library dependency: small on the surface, but security-critical, ABI-sensitive, and tied to CPU feature detection, FIPS behavior, and distribution hardening policies. Its separate release branches let downstreams apply fixes without forcing an application-level GnuPG upgrade.

Its long API/ABI compatibility promise since 1.2 is unusually package-friendly for a cryptographic C library and helps explain why it appears broadly across Unix-like package sets.

Timeline

• 2003: Libgcrypt 1.1.42 announced as a general-purpose cryptography library based on GnuPG code.
• 2005: Libgcrypt 1.2.1 announced in the GnuPG news stream.
• 2007: Libgcrypt 1.4.0 announced as a stable branch compatible with the 1.2 series.
• 2011: Libgcrypt 1.5.0 announced as a stable branch compatible with the 1.4 series.
• 2016: Libgcrypt 1.7.0 announced with new algorithms, curves, and performance work.
• 2017: Libgcrypt 1.8.0 announced with Blake2 support, XTS mode, random-number-generator work, and ARM performance improvements.
• 2022: Libgcrypt 1.10.1 announced as a stable branch with API and ABI compatibility to the 1.9 series.
• 2026: Libgcrypt 1.12.2, 1.11.3, and 1.10.4 announced for security advisory T8211.

Related projects

• GnuPG is the parent ecosystem and original source of the code lineage. GPGME sits at a higher level for applications that want GnuPG integration rather than raw cryptographic primitives. Libgpg-error is commonly paired with GnuPG libraries for shared error handling.

Sources

• https://formulae.brew.sh/formula/libgcrypt
• https://lists.gnupg.org/pipermail/gnupg-announce/2003q3/000155.html
• https://lists.gnupg.org/pipermail/gnupg-announce/2022q1/000471.html
• https://www.gnupg.org/documentation/manuals/gcrypt/
• https://www.gnupg.org/news.html
• https://www.gnupg.org/software/libgcrypt/index.html