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.NET encryption component for C#, VB.NET, ASP.NET:

Symmetric Encryption: AES, ChaCha20, Blowfish, Twofish, RC2, ARC4, DES, 3DES, PBES1, PBES2.
Hash Algorithms: SHA-1, SHA256, SHA384, SHA512, MD2, MD4, MD5, HAVAL.
Hash Algorithms: RIPEMD128, RIPEMD160, RIPEMD256, RIPEMD320.
Encoding: Base64, hex, quoted-printable, URL-encoding, modBase64, base32, base58, uu, url_oauth, url_rfc1738, url_rfc2396, url_rfc3986, fingerprint, decimal.
HMAC with any supported hash algorithm: HMAC-MD5, HMAC-SHA1, etc.
Poly1305 Message Authentication Code
Password-based Key Derivation Functions: PBKDF1, PBKDF2
PKCS7 -- P7S and P7M creation, decryption, verification.
Public key encryption/decryption with digital certificates.
Digital signature creation/verification with digital certificates.
Bzip2 in-memory compression.
Encrypt / decrypt strings or byte data.
Return encrypted data as Base64, quoted-printable, or hex-encoded strings.
Hash strings or binary data using SHA1, MD2, MD5, HAVAL, SHA384, or SHA512.
Public-key encryption with digital certificates.
Create and verify digital signatures.
Pre-convert Unicode strings to ANSI (single-byte/char) before encrypting.
Pre-convert Unicode strings to any charset before encrypting, compressing, or hashing.
Base64 encode strings or byte data.
Hex-encode encode strings or byte data.
Compress strings or byte data with the BZIP2 compression algorithm.
Implements FIPS81 padding scheme for AES.
Up to 256-bit encryption is supported.
Set binary secret-key directly for symmetric encryption algorithms.
Initialization vectors.
CBC Cipher Block Chaining Mode
ECB Electronic Cookbook Mode
OFB Output Feedback Mode
CFB Cipher Feedback Mode
GCM Galois/Counter Mode (AEAD)
CTR Counter Mode
Punycode Encoding/Decoding
Generate UUIDs
Random byte data generation.
Streaming hashing (pass data to hashing functions in chunks).
Streaming encryption (pass data to encryption functions in chunks).
Thread safe.