From 2fcafa4ffe2ba40442ab101ce8a82dfa30c835d6 Mon Sep 17 00:00:00 2001
From: Michael SCHAL <michaelschal@gmail.com>
Date: Wed, 14 Oct 2026 17:48:18 +0200
Subject: [PATCH] =?UTF-8?q?Presets=20:=20SHA-1=20de=20la=20crate=20sha1=20?=
 =?UTF-8?q?plut=C3=B4t=20qu'une=20impl=C3=A9mentation=20maison?=
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Même empreinte (vecteurs officiels et empreinte du Go toujours vérifiés par
les tests), cinquante lignes de cryptographie en moins à maintenir.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 rust/Cargo.lock             |  1 +
 rust/loki-rs/Cargo.toml     |  1 +
 rust/loki-rs/src/presets.rs | 55 ++-----------------------------------
 3 files changed, 5 insertions(+), 52 deletions(-)

diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 59e3f37..58514d0 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -333,6 +333,7 @@ dependencies = [
  "libc",
  "serde",
  "serde_json",
+ "sha1",
  "sha2",
  "tempfile",
  "tokio",
diff --git a/rust/loki-rs/Cargo.toml b/rust/loki-rs/Cargo.toml
index 95e5d7a..7d3483c 100644
--- a/rust/loki-rs/Cargo.toml
+++ b/rust/loki-rs/Cargo.toml
@@ -13,6 +13,7 @@ hyper = { version = "1.12.0", features = ["http1", "server", "client"] }
 hyper-util = { version = "0.1.21", features = ["tokio", "server", "client-legacy", "http1"] }
 serde = { version = "1.0.229", features = ["derive"] }
 serde_json = { version = "1.0.154", features = ["raw_value"] }
+sha1 = "0.11.0"
 sha2 = "0.11.1"
 tokio = { version = "1.53.2", features = ["rt-multi-thread", "macros", "net", "io-util", "time", "signal", "process", "sync", "fs"] }
 
diff --git a/rust/loki-rs/src/presets.rs b/rust/loki-rs/src/presets.rs
index 076d5bd..d52c548 100644
--- a/rust/loki-rs/src/presets.rs
+++ b/rust/loki-rs/src/presets.rs
@@ -277,59 +277,10 @@ pub fn preset_ctx(content: &str) -> String {
     n.to_string()
 }
 
-/// SHA-1 (FIPS 180-4). Le Go hache l'empreinte en SHA-1 et aucune crate SHA-1
-/// n'est disponible : implémentation directe, vérifiée par les vecteurs
-/// officiels dans les tests. Usage d'identification, pas de sécurité.
+/// SHA-1 (crate RustCrypto `sha1`), comme `crypto/sha1` côté Go.
 fn sha1(data: &[u8]) -> [u8; 20] {
-    let mut h: [u32; 5] = [0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0];
-    let mut msg = data.to_vec();
-    let bit_len = (data.len() as u64).wrapping_mul(8);
-    msg.push(0x80);
-    while msg.len() % 64 != 56 {
-        msg.push(0);
-    }
-    msg.extend_from_slice(&bit_len.to_be_bytes());
-    // Le bourrage aligne `msg` sur 64 octets : le reste est vide.
-    let (blocks, _) = msg.as_chunks::<64>();
-    for block in blocks {
-        let mut w = [0u32; 80];
-        let (words, _) = block.as_chunks::<4>();
-        for (wi, word) in w.iter_mut().zip(words) {
-            *wi = u32::from_be_bytes(*word);
-        }
-        for i in 16..80 {
-            w[i] = (w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16]).rotate_left(1);
-        }
-        let [mut a, mut b, mut c, mut d, mut e] = h;
-        for (i, wi) in w.iter().enumerate() {
-            let (f, k) = match i {
-                0..=19 => ((b & c) | (!b & d), 0x5A827999),
-                20..=39 => (b ^ c ^ d, 0x6ED9EBA1),
-                40..=59 => ((b & c) | (b & d) | (c & d), 0x8F1BBCDC),
-                _ => (b ^ c ^ d, 0xCA62C1D6),
-            };
-            let t = a
-                .rotate_left(5)
-                .wrapping_add(f)
-                .wrapping_add(e)
-                .wrapping_add(k)
-                .wrapping_add(*wi);
-            e = d;
-            d = c;
-            c = b.rotate_left(30);
-            b = a;
-            a = t;
-        }
-        for (hv, v) in h.iter_mut().zip([a, b, c, d, e]) {
-            *hv = hv.wrapping_add(v);
-        }
-    }
-    let mut out = [0u8; 20];
-    let (chunks, _) = out.as_chunks_mut::<4>();
-    for (chunk, v) in chunks.iter_mut().zip(h) {
-        *chunk = v.to_be_bytes();
-    }
-    out
+    use sha1::{Digest, Sha1};
+    Sha1::digest(data).into()
 }
 
 #[cfg(test)]