Merge pull request #4 from euphoria-laxis/release/v2.0.1

Release/v2.0.1

README.md

@@ -4,30 +4,46 @@
 
 Utils to encrypt passwords using argon2
 
-## Usage
+## Usages
 
-### Example
+### Hash password
 
 ````go
-    func func main() {
     password := 'qwerty@123'
-        hashedString, err := argon2_utils.HashStringArgon2(password)
+    // Create new encoder using default options
+    encoder, _ := argon2.NewEncoder()
+    hashedString, err = encoder.HashString(randomString)
     if err != nil {
-            ...
-        }
-        match, err := argon2_utils.CompareStringToArgon2Hash(password, hashedString)
-        if err != nil {
-            ...
-        }
-        if !match {
-            log.Println("passwords don't match")
-        } else {
-            log.Println("passwords match")
-        }
+        // handle error
     }
 ````
 
-This package also contains a **RandomString(int)(string,error)** function.
+### Compare password with hashed string
+
+````go
+    // Create new decoder using default options
+    decoder, _ := argon2.NewDecoder()
+    match, err := decoder.CompareStringToHash(password, hashedString)
+    if err != nil {
+		// handle error
+    }
+````
+
+### Configure encoder or decoder options
+
+Note that encoder and decoder inherited from the same base struct *(argon2.Options)*.
+You can use the same `argon2.OptFunc` slice to configure both encoder and decoder.
+
+````go
+    // Create new encoder using custom parameters
+    encoder, options := argon2.NewEncoder(
+        SetMemory(64 * 1024), // 64 bits
+        SetParallelism(4),    // 4 concurrent actions
+        SetKeyLength(32),     // key length
+        SetSaltLength(32),    // salt length
+        SetIterations(4),     // number of iterations
+    )
+````
 
 ## Contributions
 

argon2/decoder.go

@@ -34,7 +34,7 @@ func (decoder *Decoder) decodeHash(encodedHash string) (d *Decoder, salt, hash [
 	if version != argon2.Version {
 		return nil, nil, nil, ErrIncompatibleVersion
 	}
-	_, err = fmt.Sscanf(values[3], "m=%d,t=%d,p=%d", &decoder.memory, &decoder.iterations, &decoder.parallelism)
+	_, err = fmt.Sscanf(values[3], "m=%d,t=%d,p=%d", &decoder.Memory, &decoder.Iterations, &decoder.Parallelism)
 	if err != nil {
 		return nil, nil, nil, err
 	}
@@ -43,12 +43,12 @@ func (decoder *Decoder) decodeHash(encodedHash string) (d *Decoder, salt, hash [
 		return nil, nil, nil, err
 	}
 	d = decoder
-	d.saltLength = uint32(len(salt))
+	d.SaltLength = uint32(len(salt))
 	hash, err = base64.RawStdEncoding.DecodeString(values[5])
 	if err != nil {
 		return nil, nil, nil, err
 	}
-	d.keyLength = uint32(len(hash))
+	d.KeyLength = uint32(len(hash))
 
 	return d, salt, hash, nil
 }
@@ -58,7 +58,7 @@ func (decoder *Decoder) CompareStringToHash(password string, hashedPassword stri
 	if err != nil {
 		return false, err
 	}
-	otherHash := argon2.IDKey([]byte(password), salt, p.iterations, p.memory, p.parallelism, p.keyLength)
+	otherHash := argon2.IDKey([]byte(password), salt, p.Iterations, p.Memory, p.Parallelism, p.KeyLength)
 	if subtle.ConstantTimeCompare(hash, otherHash) == 1 {
 		return true, nil
 	}

argon2/encoder.go

@@ -31,26 +31,26 @@ func (encoder *Encoder) generateRandomBytes(n uint32) ([]byte, error) {
 }
 
 func (encoder *Encoder) HashString(password string) (encodedHash string, err error) {
-	salt, err := encoder.generateRandomBytes(encoder.saltLength)
+	salt, err := encoder.generateRandomBytes(encoder.SaltLength)
 	if err != nil {
 		return "", err
 	}
 	hash := argon2.IDKey(
 		[]byte(password),
 		salt,
-		encoder.iterations,
-		encoder.memory,
-		encoder.parallelism,
-		encoder.keyLength,
+		encoder.Iterations,
+		encoder.Memory,
+		encoder.Parallelism,
+		encoder.KeyLength,
 	)
 	b64Salt := base64.RawStdEncoding.EncodeToString(salt)
 	b64Hash := base64.RawStdEncoding.EncodeToString(hash)
 	encodedHash = fmt.Sprintf(
 		"$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
 		argon2.Version,
-		encoder.memory,
-		encoder.iterations,
-		encoder.parallelism,
+		encoder.Memory,
+		encoder.Iterations,
+		encoder.Parallelism,
 		b64Salt,
 		b64Hash,
 	)

argon2/options.go

@@ -3,22 +3,22 @@ package argon2
 import "errors"
 
 type Options struct {
-	memory      uint32
-	iterations  uint32
-	parallelism uint8
-	saltLength  uint32
-	keyLength   uint32
+	Memory      uint32
+	Iterations  uint32
+	Parallelism uint8
+	SaltLength  uint32
+	KeyLength   uint32
 }
 
 var (
 	ErrInvalidHash         = errors.New("the encoded hash is not in the correct format")
 	ErrIncompatibleVersion = errors.New("incompatible version of argon2")
 	defaultOptions         = Options{
-		memory:      64 * 1024,
-		iterations:  3,
-		parallelism: 2,
-		saltLength:  16,
-		keyLength:   32,
+		Memory:      64 * 1024,
+		Iterations:  3,
+		Parallelism: 2,
+		SaltLength:  16,
+		KeyLength:   32,
 	}
 )
 
@@ -26,30 +26,30 @@ type OptFunc func(*Options)
 
 func SetMemory(memory uint32) OptFunc {
 	return func(options *Options) {
-		options.memory = memory
+		options.Memory = memory
 	}
 }
 
 func SetIterations(iterations uint32) OptFunc {
 	return func(options *Options) {
-		options.iterations = iterations
+		options.Iterations = iterations
 	}
 }
 
 func SetParallelism(parallelism uint8) OptFunc {
 	return func(options *Options) {
-		options.parallelism = parallelism
+		options.Parallelism = parallelism
 	}
 }
 
 func SetSaltLength(saltLength uint32) OptFunc {
 	return func(options *Options) {
-		options.saltLength = saltLength
+		options.SaltLength = saltLength
 	}
 }
 
 func SetKeyLength(keyLength uint32) OptFunc {
 	return func(options *Options) {
-		options.keyLength = keyLength
+		options.KeyLength = keyLength
 	}
 }