Added the SHA256 algorithm.

README.md

@@ -14,6 +14,7 @@ GCL is a Go library designed to offer a robust collection of cryptographic algor
 GCL offers support for a diverse range of cryptographic algorithms, ensuring that your cryptographic requirements are comprehensively addressed. Our library includes:
 
 - [X] BLAKE2
+- [X] SHA256
 
 ## Installation
 

algorithms/sha256/CheckHash.go

@@ -0,0 +1,21 @@
+package sha256
+
+import (
+	// Standard
+	"crypto/sha256"
+	"crypto/subtle"
+)
+
+// Check Hash
+func (Algorithm) CheckHash(data []byte, hashToCheck []byte) (bool, error) {
+	// Hasher
+	hasher := sha256.New()
+	// Write To Hasher
+	_, err := hasher.Write(data)
+	// Handle Error
+	if err != nil {
+		return false, err
+	}
+	// Return Hash
+	return subtle.ConstantTimeCompare(hasher.Sum(nil), hashToCheck) == 1, err
+}

algorithms/sha256/Hash.go

@@ -0,0 +1,20 @@
+package sha256
+
+import (
+	// Standard
+	"crypto/sha256"
+)
+
+// Hash
+func (Algorithm) Hash(data []byte) ([]byte, error) {
+	// Hasher
+	hasher := sha256.New()
+	// Write To Hasher
+	_, err := hasher.Write(data)
+	// Handle Error
+	if err != nil {
+		return []byte(""), err
+	}
+	// Return Hash
+	return hasher.Sum(nil), err
+}

algorithms/sha256/algorithm.go

@@ -0,0 +1,10 @@
+package sha256
+
+// Algorithm
+type Algorithm struct{}
+
+// New
+func New(size int) Algorithm {
+	// Return Algorithm
+	return Algorithm{}
+}