isolated

server/crypto/common.go

@@ -1,7 +1,9 @@
 package crypto
 
 import (
+	"crypto/sha256"
 	"crypto/x509"
+	"encoding/hex"
 	"encoding/json"
 
 	"github.com/authorizerdev/authorizer/server/constants"
@@ -125,9 +127,26 @@ func EncryptEnvData(data map[string]interface{}) (string, error) {
 	return EncryptB64(string(encryptedConfig)), nil
 }
 
+// getSHA256 calculates the SHA-256 hash of a string
+func getSHA256(input string) string {
+	hash := sha256.New()
+	hash.Write([]byte(input))
+	return hex.EncodeToString(hash.Sum(nil))
+}
+
+// VerifyPassword compares a stored hashed password with a user-provided password
+func VerifyPassword(storedHashedPassword, userProvidedPassword string) error {
+	passwordSHA256 := getSHA256(userProvidedPassword)
+	// CompareHashAndPassword returns nil on success
+	err := bcrypt.CompareHashAndPassword([]byte(storedHashedPassword), []byte(passwordSHA256))
+	return err
+}
+
 // EncryptPassword is used for encrypting password
 func EncryptPassword(password string) (string, error) {
-	pw, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	// Try to generate bcrypt hash
+	passwordSHA256 := getSHA256(password)
+	pw, err := bcrypt.GenerateFromPassword([]byte(passwordSHA256), bcrypt.DefaultCost)
 	if err != nil {
 		return "", err
 	}