Libgcrypt

Libgcrypt is a cryptography library developed as a separated module of GnuPG.^[5] It can also be used independently of GnuPG, but depends on its error-reporting library Libgpg-error.^[6]

Libgcrypt

Original author(s)	Werner Koch
Developer(s)	GnuPG community^[1]
Stable release(s) [±]
stable 1.10.3 / November 14, 2023; 5 months ago (2023-11-14)^[2] LTS 1.8.11 / November 16, 2023; 5 months ago (2023-11-16)^[3]
Repository	dev.gnupg.org/source/libgcrypt.git
Written in	C
Operating system	Cross-platform
Type	Cryptographic library
License	GNU Lesser General Public License (LGPLv2.1+) / GNU General Public License (GPLv2+)^[4]
Website	gnupg.org/software/libgcrypt/

It provides functions for all fundamental cryptographic building blocks:

Primitive or Operation	Algorithms or Implementation^[7]
symmetric ciphers:^[8]	AES (128, 192, 256 bits), DES, 3DES, IDEA, CAST5, Blowfish, Twofish (128, 256 bits), Ron's Cipher 2 / RC2 (40, 128 bits), ARCfour / RC4, SEED (RFC 4269), Serpent (128, 192, 256 bits), Camellia (128, 192, 256 bits), Salsa20, Salsa20/12, ChaCha20, GOST 28147-89 (RFC 5830) / GOST R 34.12-2015 (Magma: RFC 8891 & Kuznyechik: RFC 7801), SM4
cipher modes:^[9]	ECB, CFB, CBC, OFB, CTR, CCM, GCM, OCB, EAX, XTS, Stream, AES Key Wrap (RFC 3394), SIV and GCM-SIV (RFC 5297), AES Key Wrap with padding (RFC 5649)
public key algorithms:^[10]^[11]	RSA, ElGamal, DSA, ECDSA, EdDSA, Ed448, DH, EDH, ECDH
hash algorithms:^[12]	MD2, MD4, MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA3-224, SHA3-256, SHA3-384, SHA3-512, SHAKE128, SHAKE256, RIPEMD-160, TIGER/192, TIGER1, TIGER2, Whirlpool, CRC-24 (as in RFC 2440), CRC-32 (as in ISO 3309), CRC-32 (as in RFC 1510), GOST R 34.11-94 / GOST 34.311-95, GOST R 34.11-2012 (Stribog) / RFC 6986, BLAKE2b (128, 160, 224, 256 Bits), BLAKE2s (160, 256, 384, 512 Bits), SM3^[13]
message authentication codes (MACs):^[14]	HMAC for all hash algorithms, CMAC for all cipher algorithms, GMAC for some cipher algorithms, Poly1305
key derivation functions (KDFs):^[15]	S2K (as in RFC 4880: simple, salted, iterated+salted), PBKDF2, SCRYPT, Argon2d, Argon2i, Argon2id, Balloon
elliptic curves:	NIST (P-256, P-384, P-521), SECG (secp256k1), ECC Brainpool / RFC 5639 (P256r1, P384r1, P512r1), Bernstein (Curve25519, Curve448), GOST R 34.10-2012 (RFC 7091), SM2^[16]

Libgcrypt features its own multiple precision arithmetic implementation, with assembler implementations for a variety of processors, including Alpha, AMD64, HP PA-RISC, i386, i586, M68K, MIPS 3, PowerPC, and SPARC. It also features an entropy gathering utility, coming in different versions for Unix-like and Windows machines.

Usually multiple, stable branches of Libgcrypt are maintained in parallel; since 2022-03-28 this is the Libgrypt 1.10 branch as stable branch, plus the 1.8 branch as LTS ("long-term support") branch, which will be maintained at least until 2024-12-31.^[17]

See also

•  Free and open-source software portal

• Comparison of cryptography libraries
• GNU Privacy Guard

References

1. "AUTHORS". Retrieved 2021-02-09.
2. "Libgcrypt 1.10.3 released". dev.gnupg.org. 2023-11-14. Retrieved 2023-11-16.
3. "Libgcrypt 1.8.11 released". dev.gnupg.org. 2023-11-16. Retrieved 2023-11-16.
4. "Copying". Libgcrypt. 2021-02-04. Retrieved 2021-02-09.
5. Koch, Werner (1998-12-04). "libgcrypt" (Mailing list). gnupg-devel. Retrieved 2017-08-30.
6. "Libgpg-error". GnuPG software. 2017-03-22. Retrieved 2017-12-13.
7. "src/cipher.h". 2017-06-16. Retrieved 2017-08-30.
8. "Available ciphers". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
9. "Available cipher modes". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
10. "Available algorithms". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
11. "Cryptographic Functions". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
12. "Available hash algorithms". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
13. Shen, Sean; Lee, Xiaodong; Tse, Ronald Henry; Kit, Wong Wai; Yang, Paul (2018-01-08). "The SM3 Cryptographic Hash Function". Internet Engineering Task Force. Retrieved 2023-11-16.
14. "Available MAC algorithms". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
15. "Key Derivation". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
16. Shen, Sean; Lee, Xiaodong (2014-02-14). "SM2 Digital Signature Algorithm". Internet Engineering Task Force. Retrieved 2023-11-16.
17. "End-of-life dates for GnuPG and Libgcrypt". GnuPG software. 2021-02-04. Retrieved 2021-02-07.