libsodium is a cross-platform fork of the NaCl cryptographic library. It provides secret-key and public-key encryption (XSalsa20), message authentication (Poly1305), digital signatures (Ed25519), key exchange (X25519), generic hashing (BLAKE2b, SHA256, SHA512), password hashing and key derivation (scrypt or Argon2i), in addition to facilities for guarded memory allocations and constant-time string comparisons.
RB-libsodium is a libsodium binding for Realbasic and Xojo (“classic” framework) projects. Library binaries for a number of platforms are available, or can built from source.