Libgcrypt


Libgcrypt is a cryptography library developed as a separated module of GnuPG.
It can also be used independently of GnuPG, but depends on its error-reporting library Libgpg-error.
It provides functions for all fundamental cryptographic building blocks:
Primitive or OperationAlgorithms or Implementation
symmetric ciphers:AES, DES, 3DES, IDEA, CAST5, Blowfish, Twofish, Ron's Cipher 2 / RC2, ARCfour / RC4, SEED, Serpent, Camellia, Salsa20, Salsa20/12, ChaCha20, GOST 28147-89 / GOST R 34.12-2015, SM4, ARIA
cipher modes:ECB, CFB, CBC, OFB, CTR, CCM, GCM, OCB, EAX, XTS, Stream, AES Key Wrap, AES Key Wrap with padding, SIV and GCM-SIV
public key algorithms:RSA, ElGamal, DSA, ECDSA, EdDSA, Ed448, DH, EDH, ECDH
hash algorithms: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, CRC-32 (as in ISO 3309), CRC-32, GOST R 34.11-94 / GOST 34.311-95, GOST R 34.11-2012 (Stribog) /, BLAKE2b (128, 160, 224, 256 Bits), BLAKE2s (160, 256, 384, 512 Bits), SM3
message authentication codes (MACs):HMAC for all hash algorithms, CMAC for all cipher algorithms, GMAC for some cipher algorithms, Poly1305
key derivation functions (KDFs):S2K, PBKDF2, SCRYPT, Argon2d, Argon2i, Argon2id, Balloon
elliptic curves:NIST, SECG, ECC Brainpool /, Bernstein, GOST R 34.10-2012, 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 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.
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