Libgcrypt

Libgcrypt is a cryptography library developed as a separated module of GnuPG.[3] It can also be used independently of GnuPG, but depends on its error-reporting library Libgpg-error.[4]

Libgcrypt
Developer(s)Werner Koch
Stable release(s) [±]
stable1.9.1 / January 29, 2021 (2021-01-29)[1]
old stable1.8.7 / October 23, 2020 (2020-10-23)[2]
Repository
Written inC
Operating systemCross-platform
TypeCryptographic library
LicenseGNU Lesser General Public License GNU General Public License
Websitegnupg.org/software/libgcrypt/

It provides functions for all fundamental cryptographic building blocks:

Primitive or OperationAlgorithms or Implementation[5]
symmetric ciphers:[6] 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, 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:[7] ECB, CFB, CBC, OFB, CTR, AES-Wrap (RFC 3394), CCM, GCM, Stream, OCB, EAX, XTS
public key algorithms:[8][9] RSA, ElGamal, DSA, ECDSA, EdDSA, Ed448, DH, EDH, ECDH
hash algorithms:[10] 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
message authentication codes (MACs):[11] HMAC for all hash algorithms, CMAC for all cipher algorithms, GMAC for some cipher algorithms, Poly1305
key derivation functions (KDFs):[12] S2K (as in RFC 4880: simple, salted, iterated+salted), PBKDF2, SCRYPT
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

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 2021-01-19 this is the Libgrypt 1.9 branch, plus the old stable 1.8 branch, which will be maintained at least until 2023-01-18.[13]

See also

References
  1. "Libgcrypt 1.9.1 released". dev.gnupg.org. 2021-01-29. Retrieved 2021-01-29.
  2. "Libgcrypt 1.8.7 released". dev.gnupg.org. 2020-10-23. Retrieved 2020-10-24.
  3. Koch, Werner (1998-12-04). "libgcrypt" (Mailing list). gnupg-devel. Retrieved 2017-08-30.
  4. "Libgpg-error". GnuPG software. 2017-03-22. Retrieved 2017-12-13.
  5. "src/cipher.h". 2017-06-16. Retrieved 2017-08-30.
  6. "Available ciphers". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
  7. "Available cipher modes". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
  8. "Available algorithms". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
  9. "Cryptographic Functions". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
  10. "Available hash algorithms". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
  11. "Available MAC algorithms". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
  12. "Key Derivation". The Libgcrypt Reference Manual. 2017-08-27. Retrieved 2017-08-30.
  13. "Libgrypt". GnuPG software. 2021-01-19. Retrieved 2021-01-20.
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