libaegis is a portable C implementations of the AEGIS family of high-performance
authenticated ciphers (AEGIS-128L, AEGIS-128X2, AEGIS-128X4, AEGIS-256,
AEGIS-256X2, AEGIS-256X4), with runtime CPU detection.

Features:
- AEGIS-128L with 16 and 32 bytes tags (software, AES-NI, ARM Crypto)
- AEGIS-128X2 with 16 and 32 bytes tags (software, VAES + AVX2, AES-NI, ARM
  Crypto)
- AEGIS-128X4 with 16 and 32 bytes tags (software, AVX512, VAES + AVX2, AES-NI,
  ARM Crypto)
- AEGIS-256 with 16 and 32 bytes tags (software, AES-NI, ARM Crypto)
- AEGIS-256X2 with 16 and 32 bytes tags (software, VAES + AVX2, AES-NI, ARM
  Crypto)
- AEGIS-256X4 with 16 and 32 bytes tags (software, AVX512, VAES + AVX2, AES-NI,
  ARM Crypto)
- All variants of AEGIS-MAC, supporting incremental updates.
- Encryption and decryption with attached and detached tags
- Incremental encryption and decryption.
- Unauthenticated encryption and decryption (not recommended - only implemented
  for specific protocols)
- Deterministic pseudorandom stream generation.