![]() Using the cryptography library with ESP8266Īll figures are for the Arduino Uno running at 16 MHz.BLAKE2s and BLAKE2b support regular hashing, BLAKE2 keyed hashing, and HMAC modes. They are intended as high performance replacements for SHA256 and SHA512 for when speed is critical but exact bit-compatibility of hash values is not. The SpeckTiny and SpeckSmall classes are even smaller at the cost of some performance when encrypting.īLAKE2s and BLAKE2b are variations on the ChaCha stream cipher, designed for hashing, with 256-bit and 512-bit hash outputs respectively. ![]() If code size is an issue for your application (for example on very low end Arduino variants), then Speck on AVR is less than half the code size of ChaCha, at the cost of more data memory for the state and longer key setup times. AES128, AES192, and AES256 are provided for use in applications where compatibility with other systems is desirable. For all algorithms, static sbox tables and the like are placed into program memory to further reduce data memory usage.ĬhaCha with 20 rounds and 256-bit keys is the recommended symmetric encryption algorithm because it is twice as fast as AES128, constant-time, and much more secure. Memory usage is also reduced, particularly for SHA256 and SHA512 which save 192 and 512 bytes respectively over traditional implementations. Random number generation: TransistorNoiseSource, RingOscillatorNoiseSourceĪll cryptographic algorithms have been optimized for 8-bit Arduino platforms like the Uno.Other algorithms are provided in the remaining directories under "libraries", and consist of algorithms that are either too big for the main library, or are dedicated to a special purpose that only some applications will need: Over time, other algorithms may be moved from the core library to legacy. If you were looking to use CBC in your project, then please consider transitioning to one of the AEAD schemes listed above. It was an important mode in the past but newer designs should be using authenticated encryption with associated data (AEAD) instead. Legacy algorithms in the "libraries/CryptoLegacy" directory are those that should probably not be used in new protocol designs, but may be required for backwards-compatibility with older protocols:ĬBC is included in the legacy list because cryptography experts no longer recommend it for use in newer designs. Maybe you'll be the one to create that new standard! They don't appear in any internationally adopted standards yet but any algorithms that are adopted into standards later will be moved to the core library. These algorithms are fairly new, but they are ideal for Arduino devices. Block ciphers: Speck, SpeckSmall, SpeckTiny.Authenticated encryption with associated data (AEAD): Acorn128, Ascon128. ![]() The algorithms in the "libraries/CryptoLW" directory are new algorithms that have been designed for "light-weight" environments where memory and CPU resources are constrained: The "small" versions use a little more memory but support both encryption and decryption. The "tiny" versions only support encryption which makes them suitable for the CTR, CFB, OFB, EAX, and GCM block cipher modes but not CBC. ![]()
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