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| # Cryptography Primitives used in Halite | ||
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| * Symmetric-key encryption: (note: only [authenticated encryption](https://tonyarcieri.com/all-the-crypto-code-youve-ever-written-is-probably-broken) is available through Halite) | ||
| * [**XChaCha20**](https://libsodium.gitbook.io/doc/advanced/stream_ciphers/xchacha20) | ||
| * Previously, [**XSalsa20**](https://paragonie.com/book/pecl-libsodium/read/08-advanced.md#crypto-stream) | ||
| * [**XChaCha20**](https://libsodium.gitbook.io/doc/advanced/stream_ciphers/xchacha20) then BLAKE2b-MAC | ||
| * Previously, [**XSalsa20**](https://paragonie.com/book/pecl-libsodium/read/08-advanced.md#crypto-stream) then BLAKE2b-MAC | ||
| * Symmetric-key authentication: **[BLAKE2b](https://download.libsodium.org/doc/hashing/generic_hashing.html#singlepart-example-with-a-key)** (keyed) | ||
| * Asymmetric-key encryption: [**X25519**](https://paragonie.com/book/pecl-libsodium/read/08-advanced.md#crypto-scalarmult) followed by symmetric-key authenticated encryption | ||
| * Asymmetric-key encryption: [**X25519**](https://paragonie.com/book/pecl-libsodium/read/08-advanced.md#crypto-scalarmult) | ||
| then [**HKDF-BLAKE2b**](Classes/Util.md#raw_keyed_hash), followed by symmetric-key authenticated encryption | ||
| * Asymmetric-key digital signatures: [**Ed25519**](https://paragonie.com/book/pecl-libsodium/read/05-publickey-crypto.md#crypto-sign) | ||
| * Checksums: [**BLAKE2b**](https://paragonie.com/book/pecl-libsodium/read/06-hashing.md#crypto-generichash) | ||
| * Key splitting: [**HKDF-BLAKE2b**](Classes/Util.md) | ||
| * Key splitting: [**HKDF-BLAKE2b**](Classes/Util.md#splitkeys) | ||
| * Password-Based Key Derivation: [**Argon2**](https://paragonie.com/book/pecl-libsodium/read/07-password-hashing.md#crypto-pwhash-str) | ||
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| In all cases, we follow an Encrypt then MAC construction, thus avoiding the [cryptographic doom principle](https://moxie.org/2011/12/13/the-cryptographic-doom-principle.html). | ||
| In all cases, we follow an Encrypt-then-MAC construction, thus avoiding the [cryptographic doom principle](https://moxie.org/2011/12/13/the-cryptographic-doom-principle.html). | ||
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| As a consequence of our use of a keyed BLAKE2b hash as a MAC, instead of GCM/Poly1305, | ||
| Halite ciphertexts are [**message committing**](https://eprint.iacr.org/2020/1456) which makes ciphertexts random key robust. |