crypto: use ChaCha8 instead of AES-CTR for trng CSPRNG (#45)

Fixes #40 Signed-off-by: Eric Lagergren <[email protected]> Co-authored-by: Jonathan Dygert <[email protected]>
aranya-project · Jan 15, 2025 · 83b083c · 83b083c
1 parent 2770e76
commit 83b083c
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Showing 3 changed files with 203 additions and 151 deletions.
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/crates/aranya-crypto-core/Cargo.toml b/crates/aranya-crypto-core/Cargo.toml
@@ -109,6 +109,7 @@ std = [
 	"postcard/use-std",
 	"rand?/std",
 	"rand?/std_rng",
+	"rand_chacha?/std",
 	"rand_core/std",
 	"serde/std",
 	"serde_json?/std",
@@ -133,6 +134,7 @@ test_util = [
 trng = [
 	"dep:aes",
 	"dep:lazy_static",
+	"dep:rand_chacha",
 	"dep:spin",
 ]
 
@@ -159,6 +161,7 @@ p384 = { version = "0.13", default-features = false, features = ["ecdh", "ecdsa"
 # Required by `aranya_crypto_derive::AlgId`.
 postcard = { workspace = true, default-features = false, features = ["heapless", "experimental-derive"] }
 rand = { workspace = true, default-features = false, optional = true }
+rand_chacha = { version = "0.3", default-features = false, optional = true }
 # `rand_core` is required by the `rust` backend.
 rand_core = { workspace = true, default-features = false }
 # TODO(eric): Make this optional, it should only be needed by