diff --git a/src/main.rs b/src/main.rs
index 040cc57..24e5d78 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,23 +1,52 @@
 mod sha;
 
 fn main() {
-    test_sha();
+    test_sha224();
+    test_sha256();
 }
 
-fn test_sha(){
-    println!("Input:       \"\"");
-    println!("Expected:    0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
-    println!("Result Hash: 0x{}", sha::sha256("".to_string()));
+fn test_sha256() {
+    println!("   Input:       \"\"");
+    println!("   Expected:    0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
+    println!("   Result Hash: 0x{}", sha::sha256("".to_string()));
 
-    println!("\n##########################################\n");
+    println!("_____________________________");
 
-    println!("Input:       \"abc\"");
-    println!("Expected:    0xba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad");
-    println!("Result Hash: 0x{}", sha::sha256("abc".to_string()));
+    println!("   Input:       \"abc\"");
+    println!("   Expected:    0xba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad");
+    println!("   Result Hash: 0x{}", sha::sha256("abc".to_string()));
 
-    println!("\n##########################################\n");
-    
-    println!("Input:       \"The quick brown fox jumps over the lazy dog\"");
-    println!("Expected:    0xd7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592");
-    println!("Result Hash: 0x{}", sha::sha256("The quick brown fox jumps over the lazy dog".to_string()));
-}
\ No newline at end of file
+    println!("_____________________________");
+
+    println!("   Input:       \"The quick brown fox jumps over the lazy dog\"");
+    println!("   Expected:    0xd7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592");
+    println!(
+        "   Result Hash: 0x{}",
+        sha::sha256("The quick brown fox jumps over the lazy dog".to_string())
+    );
+
+    println!("_____________________________");
+}
+
+fn test_sha224() {
+    println!("   Input:       \"\"");
+    println!("   Expected:    0xd14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f");
+    println!("   Result Hash: 0x{}", sha::sha224("".to_string()));
+
+    println!("_____________________________");
+
+    println!("   Input:       \"abc\"");
+    println!("   Expected:    0x23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7");
+    println!("   Result Hash: 0x{}", sha::sha224("abc".to_string()));
+
+    println!("_____________________________");
+
+    println!("   Input:       \"The quick brown fox jumps over the lazy dog\"");
+    println!("   Expected:    0x730e109bd7a8a32b1cb9d9a09aa2325d2430587ddbc0c38bad911525");
+    println!(
+        "   Result Hash: 0x{}",
+        sha::sha224("The quick brown fox jumps over the lazy dog".to_string())
+    );
+
+    println!("_____________________________");
+}
diff --git a/src/sha/mod.rs b/src/sha/mod.rs
index 809c4fe..6435940 100644
--- a/src/sha/mod.rs
+++ b/src/sha/mod.rs
@@ -58,8 +58,42 @@ fn pad_message(message: String) -> Vec<u32> {
 }
 //////////// END HELPER FUNCTIONS /////////////
 
-pub fn sha256(message: String) -> String{
+pub fn sha224(message: String) -> String {
+    // Set initial hash values
+    let init_hash_value: [u32; 8] = [
+        0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939, 0xffc00b31, 0x68581511, 0x64f98fa7,
+        0xbefa4fa4,
+    ];
 
+    let hash = sha_u32_calculate(init_hash_value, message);
+    let hash = &hash[..7];
+
+    // After processing the entire message concatenate the result into the final variable
+    return hash
+        .iter()
+        .map(|&num| format!("{:08x}", num))
+        .collect::<Vec<String>>()
+        .join("");
+}
+
+pub fn sha256(message: String) -> String {
+    // Set initial hash values
+    let init_hash_value: [u32; 8] = [
+        0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab,
+        0x5be0cd19,
+    ];
+
+    let hash = sha_u32_calculate(init_hash_value, message);
+
+    // After processing the entire message concatenate the result into the final variable
+    return hash
+        .iter()
+        .map(|&num| format!("{:08x}", num))
+        .collect::<Vec<String>>()
+        .join("");
+}
+
+fn sha_u32_calculate(init_hash_value: [u32; 8], message: String) -> [u32; 8] {
     // Fill constants array with values
     const K: [u32; 64] = [
         0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4,
@@ -74,23 +108,19 @@ pub fn sha256(message: String) -> String{
         0xc67178f2,
     ];
 
-    // Set initial hash values 
-    let mut hash: [u32; 8] = [
-        0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab,
-        0x5be0cd19,
-    ];
+    let mut hash = init_hash_value;
 
     // Pad message as required
     let msg_vec: Vec<u32> = pad_message(message);
 
-    // Process each chunk 64 Byte of message vector 
+    // Process each chunk 64 Byte of message vector
     for chunk in msg_vec.chunks(64) {
-        // Initialize temp variables and the word vector 
+        // Initialize temp variables and the word vector
         let mut w: Vec<u32> = Vec::with_capacity(64);
         let mut t1: u32;
         let mut t2: u32;
 
-        // Fill first 16 Byte of the word vector with the chunk values 
+        // Fill first 16 Byte of the word vector with the chunk values
         for t in 0..16 {
             w.push(chunk[t]);
         }
@@ -145,8 +175,5 @@ pub fn sha256(message: String) -> String{
     } // End of chunk processing
 
     // After processing the entire message concatenate the result into the final variable
-    return hash.iter()
-        .map(|&num| format!("{:08x}", num))
-        .collect::<Vec<String>>()
-        .join("");
+    return hash;
 }