CRY

CRY is a small, comprehensive and portable cryptographic library prividing a good collection of ciphers, hash functions, pseudo-random number generators and multi-precision integers algorithms.

⚠️ WARNING ⚠️

The code has never been audited by any third party nor has been developed with the intent to be used for any serious application.

Main focus was personal research and fun.

The implementations are not constant time nor efficient.

USE IT AT YOUR OWN RISK!!!

Symmetric ciphers

Block ciphers

• AES (Rijndael)
• DES and Triple DES

Block ciphers mode of operation

• ECB (electronic codebook)
• CBC (cipher block chaining)
• CFB (cipher feedback)
• CTR (counter)
• GCM (Galois counter mode)

Stream ciphers

• ARC4
• Trivium

Public key algorithms

Ciphers

• RSA (PKCS1 v1.5 padding)

Secret exchange

• Diffie-Hellman (DH)
• ECDH

Digital signature

• RSA (PKCS1 v2.1 PSS padding)
• DSA
• ECDSA
• Elgamal

Elliptic Curve

• EC group arithmetic.
• NIST recommended elliptic curve domain parameters over Fp.
• Brainpool standard curve domain parameters over Fp (RFC 5639).

Pseudo random numbers generators

• AES-CTR CSPRNG
• LFSR-113 fast PRNG

Message authentication code

• HMAC
• CMAC

Hash

Secure hash

• MD5
• SHA-1
• SHA-256
• SHA-512

CRC

• CRC16-CCITT
• CRC16-IBM
• CRC16-DNP
• CRC32-Ethernet

Classical ciphers

Substitution ciphers

• Hill cipher
• Polyalphabetic Affine cipher

Multiple precision integers

• Basic arithmentic (add,sub,mul,div,mod,abs,exp,sqr)
• Modular exponentiation
• Modular inverse (Euclidean)
• GCD and LCM
• Probabilistic prime numbers generator (Miller-Rabin)
• Random mpi generator
• Comba, Karatsuba and Toom-Cook-3 multipliers

Utilities

• AES Key Wrap (RFC-3394)
• Base64 encoder/decoder
• Memxor