Adding a Hashing function (#914)

lib/config/snowflake.go

@@ -3,7 +3,7 @@ package config
 import (
 	"fmt"
 
-	"github.com/artie-labs/transfer/lib/crypto"
+	"github.com/artie-labs/transfer/lib/cryptography"
 	"github.com/artie-labs/transfer/lib/typing"
 	"github.com/snowflakedb/gosnowflake"
 )
@@ -39,7 +39,7 @@ func (s Snowflake) ToConfig() (*gosnowflake.Config, error) {
 	}
 
 	if s.PathToPrivateKey != "" {
-		key, err := crypto.LoadRSAKey(s.PathToPrivateKey)
+		key, err := cryptography.LoadRSAKey(s.PathToPrivateKey)
 		if err != nil {
 			return nil, fmt.Errorf("failed to load private key: %w", err)
 		}

lib/crypto/rsa.go → lib/cryptography/cryptography.go

@@ -1,15 +1,28 @@
-package crypto
+package cryptography
 
 import (
 	"crypto/rsa"
+	"crypto/sha256"
 	"crypto/x509"
+	"encoding/hex"
 	"encoding/pem"
 	"fmt"
 	"os"
 
 	"github.com/artie-labs/transfer/lib/typing"
 )
 
+// HashValue - Hashes a value using SHA256
+func HashValue(value any) any {
+	if value == nil {
+		return nil
+	}
+
+	hash := sha256.New()
+	hash.Write([]byte(fmt.Sprint(value)))
+	return hex.EncodeToString(hash.Sum(nil))
+}
+
 func LoadRSAKey(filePath string) (*rsa.PrivateKey, error) {
 	keyBytes, err := os.ReadFile(filePath)
 	if err != nil {

lib/cryptography/cryptography_test.go

@@ -0,0 +1,34 @@
+package cryptography
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestHashValue(t *testing.T) {
+	{
+		// If we pass nil in, we should get nil out.
+		assert.Equal(t, nil, HashValue(nil))
+	}
+	{
+		// Pass in an empty string
+		assert.Equal(t, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", HashValue(""))
+	}
+	{
+		// Pass in a string
+		assert.Equal(t, "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9", HashValue("hello world"))
+	}
+	{
+		// Value should be deterministic.
+		for range 50 {
+			assert.Equal(t, "b9a40320d82075681b2500e38160538e5e912bd8f49c03e87367fe82c1fa35d2", HashValue("dusty the mini aussie"))
+		}
+	}
+}
+
+func BenchmarkHashValue(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		assert.Equal(b, "b9a40320d82075681b2500e38160538e5e912bd8f49c03e87367fe82c1fa35d2", HashValue("dusty the mini aussie"))
+	}
+}