From 4f1c530941c4c96fdb3762b3a19dc239094a2f20 Mon Sep 17 00:00:00 2001
From: malloc <aleco@aroltd.com>
Date: Wed, 14 Mar 2018 17:14:08 -0500
Subject: [PATCH] unfinished sha do NOT look or you will DEI

---
 server/src/crypto/sha1.cpp | 72 ++++++++++++++++++++++++++++++++++++++
 server/src/crypto/sha1.hpp | 11 ++++++
 2 files changed, 83 insertions(+)

diff --git a/server/src/crypto/sha1.cpp b/server/src/crypto/sha1.cpp
index 8b13789..dab5018 100644
--- a/server/src/crypto/sha1.cpp
+++ b/server/src/crypto/sha1.cpp
@@ -1 +1,73 @@
+#include "sha1.hpp"
 
+#define SHA1_BLOCK_SIZE 64
+
+static inline uint32_t Z(uint32_t x, uint32_t y) {
+    return x + y;
+}
+
+static inline uint32_t S(uint32_t X, uint8_t n) {
+    n = n % 32;
+    return (X << n) | (X >> (32 - n));
+}
+
+static uint32_t f
+    (uint8_t t, uint32_t B, uint32_t C, uint32_t D)
+{
+    t = t % 80;
+    if(t <= 19)
+        return (B & C) | (~B & D);
+    else if(t >= 20 && t <= 39)
+        return B ^ C ^ D;
+    else if(t >= 40 && t <= 59)
+        return (B & C) | (B & D) | (C & D);
+    else
+        return B ^ C ^ D;
+}
+
+static uint32_t K(uint8_t t) {
+    t = t % 80;
+    if(t <= 19)
+        return 0x5A827999;
+    else if(t >= 20 && t <= 39)
+        return 0x6ED9EBA1;
+    else if(t >= 40 && t <= 59)
+        return 0x8F1BBCDC;
+    else
+        return 0xCA62C1D6;
+}
+
+std::string sosc::cgc::sha1(const std::string& data) {
+    int last_block = data.length() % 64, 
+        pad_size = SHA1_BLOCK_SIZE - last_block;
+        
+    if(last_block >= 55)
+        pad_size += SHA1_BLOCK_SIZE;
+    
+    std::string padding(0, pad_size);
+    padding[0] = 0x80;
+    
+    for(int i = 0; i < 8; ++i) {
+        padding[padding.length() - i - 1] =
+            (padding.length() >> (8 * i)) & 0xFF;
+    }
+           
+    uint32_t H[5] = {
+        0x67452301,
+        0xEFCDAB89,
+        0x98BADCFE,
+        0x10325476,
+        0xC3D2E1F0
+    }, W[80], A, B, C, D, E;
+    
+    for(int i = 0; i < data.length() + padding.length(); i += SHA1_BLOCK_SIZE) 
+    {
+        for(int j = 0; j < 16; ++j) {
+            W[j] = 0;
+            for(int k = 0; k < 4; ++k) {
+                if(i + j + k < data.length())
+                    W[j] |= (data[i + j + k]
+            }
+        }
+    }
+}
diff --git a/server/src/crypto/sha1.hpp b/server/src/crypto/sha1.hpp
index 8b13789..337424f 100644
--- a/server/src/crypto/sha1.hpp
+++ b/server/src/crypto/sha1.hpp
@@ -1 +1,12 @@
+#ifndef SOSC_CRYPTO_SHA1
+#define SOSC_CRYPTO_SHA1
 
+#include <cstdint>
+#include <string>
+
+namespace sosc {
+namespace cgc {
+std::string sha1(const std::string& data);
+}}
+
+#endif