From 8a0d8fbaf59be7acc536b2a753caa27aa1fbae24 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Sun, 7 Apr 2019 14:06:36 -0400
Subject: use sha1 as checksum

---
 include/salticidae/crypto.h | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/salticidae/msg.h    | 14 +++++++-------
 2 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/include/salticidae/crypto.h b/include/salticidae/crypto.h
index 79e9377..772cce1 100644
--- a/include/salticidae/crypto.h
+++ b/include/salticidae/crypto.h
@@ -72,6 +72,48 @@ class SHA256 {
     }
 };
 
+class SHA1 {
+    SHA_CTX ctx;
+
+    public:
+    SHA1() { reset(); }
+
+    void reset() {
+        if (!SHA1_Init(&ctx))
+            throw std::runtime_error("openssl SHA1 init error");
+    }
+
+    template<typename T>
+    void update(const T &data) {
+        update(reinterpret_cast<const uint8_t *>(&*data.begin()), data.size());
+    }
+
+    void update(const bytearray_t::const_iterator &it, size_t length) {
+        update(&*it, length);
+    }
+
+    void update(const uint8_t *ptr, size_t length) {
+        if (!SHA1_Update(&ctx, ptr, length))
+            throw std::runtime_error("openssl SHA1 update error");
+    }
+
+    void _digest(bytearray_t &md) {
+        if (!SHA1_Final(&*md.begin(), &ctx))
+            throw std::runtime_error("openssl SHA1 error");
+    }
+
+    void digest(bytearray_t &md) {
+        md.resize(32);
+        _digest(md);
+    }
+
+    bytearray_t digest() {
+        bytearray_t md(32);
+        _digest(md);
+        return std::move(md);
+    }
+};
+
 }
 
 #endif
diff --git a/include/salticidae/msg.h b/include/salticidae/msg.h
index 42a9bc2..03eb6dd 100644
--- a/include/salticidae/msg.h
+++ b/include/salticidae/msg.h
@@ -192,19 +192,19 @@ class MsgBase {
 
 #ifndef SALTICIDAE_NOCHECKSUM
     uint32_t get_checksum() const {
-        static thread_local class SHA256 sha256;
+        static thread_local class SHA1 sha1;
         uint32_t res;
         bytearray_t tmp;
 #ifndef SALTICIDAE_NOCHECK
         if (no_payload)
             throw std::runtime_error("payload not available");
 #endif
-        sha256.reset();
-        sha256.update(payload);
-        sha256.digest(tmp);
-        sha256.reset();
-        sha256.update(tmp);
-        sha256.digest(tmp);
+        sha1.reset();
+        sha1.update(payload);
+        sha1.digest(tmp);
+        //sha256.reset();
+        //sha256.update(tmp);
+        //sha256.digest(tmp);
         memmove(&res, &*tmp.begin(), 4);
         return res;
     }
-- 
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