fixed project,

implemented hash computation of SHA1

ASYD_Cryptograhpy/SW05-SHA1/SW05-SHA1.vcxproj

@@ -21,9 +21,6 @@
   <ItemGroup>
     <ClCompile Include="main.c" />
   </ItemGroup>
-  <ItemGroup>
-    <ClInclude Include="DSA.h" />
-  </ItemGroup>
   <PropertyGroup Label="Globals">
     <VCProjectVersion>16.0</VCProjectVersion>
     <Keyword>Win32Proj</Keyword>

ASYD_Cryptograhpy/SW05-SHA1/SW05-SHA1.vcxproj.filters

@@ -19,9 +19,4 @@
       <Filter>Source Files</Filter>
     </ClCompile>
   </ItemGroup>
-  <ItemGroup>
-    <ClInclude Include="DSA.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
-  </ItemGroup>
 </Project>

ASYD_Cryptograhpy/SW05-SHA1/main.c

@@ -25,28 +25,44 @@
 #define INPUT_MESSAGE ("Testnachricht 123")
 
 #pragma region SHA1-Constants
+// initial hash values
 #define H0 0x67452301
 #define H1 0xEFCDAB89
 #define H2 0x98BADCFE
 #define H3 0x10325476
 #define H4 0xC3D2E1F0
+// constants Kt
+#define K1 0x5A827999
+#define K2 0x6ED9EBA1
+#define K3 0x8F1BBCDC
+#define K4 0xCA62C1D6
 #pragma endregion
 
 void printBits(size_t const size, void const* const ptr);
 uint32_t leftRotate(uint32_t n, uint32_t d);
+uint32_t SHA1_f1(uint32_t b, uint32_t c, uint32_t d);
+uint32_t SHA1_f2(uint32_t b, uint32_t c, uint32_t d);
+uint32_t SHA1_f3(uint32_t b, uint32_t c, uint32_t d);
+uint32_t SHA1_f4(uint32_t b, uint32_t c, uint32_t d);
 
 void main(void) {
 
     int result = 0;
 
+    printf("****** SHA1 preprocessing ******\n\n");
+#pragma region Preprocessing
+
     printf("------ Set initial hash value ------\n\n");
     #pragma region Initial Hash values
-    uint32_t h0, h1, h2, h3, h4;
+    uint32_t a, b, c, d, e;
-    h0 = H0;
+    uint32_t h[5] = { H0, H1, H2, H3, H4 };
-    h1 = H1;
+    uint32_t k[5] = { 0,  K1, K2, K3, K4 }; // 5 so the array can be accessed by 1, 2, 3, 4
-    h2 = H2;
+    a = h[0];
-    h3 = H3;
+    b = h[1];
-    h4 = H4;
+    c = h[2];
+    d = h[3];
+    e = h[4];
+
     #pragma endregion
 
     if (sizeof(INPUT_MESSAGE) * 8 > 447) {
@@ -57,7 +73,7 @@ void main(void) {
     printf("------ Padding message ------\n\n");
     #pragma region Padding
     unsigned char messageNoPadding[] = INPUT_MESSAGE;
-    printf("Size of message without padding: %i bits\n", sizeof(INPUT_MESSAGE) * 8);
+    printf("Size of message without padding: %i bits\n", (int)(sizeof(INPUT_MESSAGE) * 8));
     printf("Message without padding\n");
     printBits(sizeof(messageNoPadding), &messageNoPadding);
     unsigned char message[BLOCK_LENGTH] = "";
@@ -71,12 +87,17 @@ void main(void) {
     printf("\nMessage after adding 1: \n");
     printBits(sizeof(message), &message);
     message[BLOCK_LENGTH - 1] = sizeof(INPUT_MESSAGE) * 8;
-    printf("\nMessage after length 1: \n");
+    printf("\nMessage after adding length: \n");
     printBits(sizeof(message), &message);
     #pragma endregion
 
-    printf("------ Message scheduling ------\n\n");
+#pragma endregion
-    #pragma region Message scheduling
+
+    printf("****** Hash computation ******\n\n");
+#pragma region Hash computation
+
+    printf("\n------ Prepare message schedule ------\n\n");
+    #pragma region Prepare message schedule
     uint32_t WordArray[80] = { 0 };
     for (uint32_t i = 0; i < 16; i++) {
         uint32_t currentbyte = message[i] << 24;
@@ -88,9 +109,62 @@ void main(void) {
     }
     #pragma endregion
 
+    printf("\n------ Stages ------\n\n");
+    #pragma region Stages calculations
+    uint32_t (*f_ptr)(uint32_t, uint32_t, uint32_t) = &SHA1_f1; // use: (*f_ptr)(b,c,d);
+    uint8_t t = 1;
+
+    // stage 1...4
+    for (uint32_t i = 0; i < 80; i++) {
+        uint32_t T = leftRotate(a, 5) + ((*f_ptr)(b, c, d)) + e + k[t] + WordArray[i];
+        e = d;
+        d = c;
+        c = leftRotate(b, 30);
+        b = a;
+        a = T;
+
+        // switch stages
+        if (i == 19) { f_ptr = SHA1_f2; t = 2; }
+        else if (i == 39) { f_ptr = SHA1_f3; t = 3; }
+        else if (i == 59) { f_ptr = SHA1_f4; t = 4; }
+    }
+    #pragma endregion
+
+    printf("\n------ Intermediate hash calculation ------\n\n");
+    #pragma region intermediate hash calculation
+    h[0] = a + h[0];
+    h[1] = b + h[1];
+    h[2] = c + h[2];
+    h[3] = d + h[3];
+    h[4] = e + h[4];
+    #pragma endregion
+#pragma endregion
+
+    printf("\n****** Resulting hash ******\n\n");
+    for (uint8_t i = 0; i < 5; i++) {
+        printf("%X", h[i]);
+    }
+    printf("\n\n");
+
     return 0;
 }
 
+uint32_t SHA1_f1(uint32_t b, uint32_t c, uint32_t d) {
+    return (b & c) | (~b & d);
+}
+
+uint32_t SHA1_f2(uint32_t b, uint32_t c, uint32_t d) {
+    return b ^ c ^ d;
+}
+
+uint32_t SHA1_f3(uint32_t b, uint32_t c, uint32_t d) {
+    return (b & c) | (b & d) | (c & d);
+}
+
+uint32_t SHA1_f4(uint32_t b, uint32_t c, uint32_t d) {
+    return b ^ c ^ d;
+}
+
 uint32_t leftRotate(uint32_t n, uint32_t d)
 {
     /* In n<<d, last d bits are 0. To put first 3 bits of n at
@@ -111,7 +185,8 @@ void printBits(size_t const size, void const* const ptr)
             printf("%u", byte);
         }
     }
-    /*for (i = size - 1; i >= 0; i--) {
+    /*original:
+    for (i = size - 1; i >= 0; i--) {
         for (j = 7; j >= 0; j--) {
             byte = (b[i] >> j) & 1;
             printf("%u", byte);