Merge pull request 'htpasswd: refactor and add Passwd methods' (#3)

Reviewed-on: #3

htpasswd/apr1.go

@@ -0,0 +1,22 @@
+package htpasswd
+
+import "github.com/GehirnInc/crypt/apr1_crypt"
+
+// Apr1 facilitates apr1 style hashing
+type Apr1 struct{}
+
+// Hash returns the hashed variant of the password or an error
+func (*Apr1) Hash(passwd string) (string, error) {
+	return apr1_crypt.New().Generate([]byte(passwd), nil)
+}
+
+// Match verifier the hashed password using the original
+func (*Apr1) Match(password, hashedPassword string) error {
+	return apr1_crypt.New().Verify(hashedPassword, []byte(password))
+}
+
+// Name returns the name of the hasher
+func (*Apr1) Name() string { return "apr1" }
+
+// Prefix returns the hasher's prefix
+func (*Apr1) Prefix() string { return "$apr1$" }

htpasswd/bcrypt.go

@@ -0,0 +1,26 @@
+package htpasswd
+
+import "golang.org/x/crypto/bcrypt"
+
+// Bcrypt facilitates bcrypt style hashing
+type Bcrypt struct{}
+
+// Hash returns the hashed variant of the password or an error
+func (*Bcrypt) Hash(password string) (string, error) {
+	passwordBytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return "", err
+	}
+	return string(passwordBytes), nil
+}
+
+// Match verifier the hashed password using the original
+func (*Bcrypt) Match(password, hashedPassword string) error {
+	return bcrypt.CompareHashAndPassword([]byte(hashedPassword), []byte(password))
+}
+
+// Name returns the name of the hasher
+func (*Bcrypt) Name() string { return "bcrypt" }
+
+// Prefix returns the hasher's prefix
+func (*Bcrypt) Prefix() string { return "$2a$" }

htpasswd/htpasswd.go

@@ -2,41 +2,22 @@
 package htpasswd
 
 import (
-	"bytes"
-	"crypto/rand"
-	"crypto/sha1"
-	"crypto/sha256"
-	"crypto/sha512"
-	"encoding/base64"
 	"errors"
 	"fmt"
 	"os"
 	"strings"
-
-	"github.com/GehirnInc/crypt/apr1_crypt"
-	"golang.org/x/crypto/bcrypt"
 )
 
 // Passwds name => hash
 type Passwds map[string]string
 
-// HashAlgorithm enum for hashing algorithms
+// Hasher interface implemented by hash algos
-type HashAlgorithm string
+type Hasher interface {
-
+	Hash(password string) (string, error)
-const (
+	Match(password, hashedPassword string) error
-	// HashAPR1 Apache MD5 crypt
+	Name() string
-	HashAPR1 HashAlgorithm = "apr1"
+	Prefix() string
-	// HashBCrypt bcrypt
+}
-	HashBCrypt HashAlgorithm = "bcrypt"
-	// HashSHA SHA
-	HashSHA HashAlgorithm = "sha"
-	// HashSSHA Salted SHA
-	HashSSHA HashAlgorithm = "ssha"
-	// HashSHA256 256 variant of SHA
-	HashSHA256 HashAlgorithm = "sha256"
-	// HashSHA512 512 variant of SHA
-	HashSHA512 HashAlgorithm = "sha512"
-)
 
 // ParseHtpasswdFile parses a .htpasswd file
 // and returns a Passwd type
@@ -79,58 +60,60 @@ func ParseHtpasswd(htpasswdBytes []byte) (Passwds, error) {
 	return passwords, err
 }
 
-func validLine(parts []string, lineNumber int, line string) (bool, error) {
-	var err error
-	if len(parts) != 2 {
-		err = errors.New(fmt.Sprintln("invalid line", lineNumber+1,
-			"unexpected number of parts split by", ":", len(parts),
-			"instead of 2 in\"", line, "\""))
-		return false, err
-	}
-	return true, nil
-}
-
-func trimParts(parts []string) []string {
-	for i, part := range parts {
-		parts[i] = strings.Trim(part, " ")
-	}
-	return parts
-}
-
 // CreateUser creates a record in the named file with
 // the named password and hash algorithm
-func CreateUser(file, user, passwd string, algo HashAlgorithm) error {
+func CreateUser(file, user, passwd string, algo Hasher) error {
 	pp, err := ParseHtpasswdFile(file)
 	if err != nil {
 		return err
 	}
+	err = pp.CreateUser(user, passwd, algo)
+	if err != nil {
+		return err
+	}
+	return pp.Write(file)
+}
+
+// CreateUser will create a new user in the given Passwd object
+// using the given name, password and hashing algorithm
+func (pp Passwds) CreateUser(user, passwd string, algo Hasher) error {
 	if _, exists := pp[user]; exists {
 		return fmt.Errorf("user %s already exists", user)
 	}
-	h, err := createHash(passwd, algo)
+	h, err := algo.Hash(passwd)
 	if err != nil {
 		return err
 	}
 	pp[user] = h
-	return os.WriteFile(file, pp.toByte(), os.ModePerm)
+	return nil
 }
 
 // UpdateUser will update the password for the named user
 // in the named file
-func UpdateUser(file, user, passwd string, algo HashAlgorithm) error {
+func UpdateUser(file, user, passwd string, algo Hasher) error {
 	pp, err := ParseHtpasswdFile(file)
 	if err != nil {
 		return err
 	}
+	err = pp.UpdateUser(user, passwd, algo)
+	if err != nil {
+		return err
+	}
+	return pp.Write(file)
+}
+
+// UpdateUser will update the password for the named user
+// using the given name, password and hashing algorithm
+func (pp Passwds) UpdateUser(user, passwd string, algo Hasher) error {
 	if _, exists := pp[user]; !exists {
 		return fmt.Errorf("user %s does not exist", user)
 	}
-	h, err := createHash(passwd, algo)
+	h, err := algo.Hash(passwd)
 	if err != nil {
 		return err
 	}
 	pp[user] = h
-	return os.WriteFile(file, pp.toByte(), os.ModePerm)
+	return nil
 }
 
 // DeleteUser deletes the named user from the named file
@@ -139,12 +122,22 @@ func DeleteUser(file, user string) error {
 	if err != nil {
 		return err
 	}
+	err = pp.DeleteUser(user)
+	if err != nil {
+		return err
+	}
+
+	return pp.Write(file)
+}
+
+// DeleteUser deletes the named user from the named file
+func (pp Passwds) DeleteUser(user string) error {
 	if _, exists := pp[user]; !exists {
 		return fmt.Errorf("user %s does not exist", user)
 	}
 
 	delete(pp, user)
-	return os.WriteFile(file, pp.toByte(), os.ModePerm)
+	return nil
 }
 
 // VerifyUser will check if the given user and password are matching
@@ -154,12 +147,12 @@ func VerifyUser(file, user, passwd string) error {
 	if err != nil {
 		return err
 	}
-	return pp.Verify(user, passwd)
+	return pp.VerifyUser(user, passwd)
 }
 
-// Verify will check if the given user and password are matching
+// VerifyUser will check if the given user and password are matching
-// with the given Passwd object content
+// with the given Passwd object
-func (pp Passwds) Verify(user, passwd string) error {
+func (pp Passwds) VerifyUser(user, passwd string) error {
 	if _, ok := pp[user]; !ok {
 		return fmt.Errorf("user %s does not exist", user)
 	}
@@ -167,132 +160,16 @@ func (pp Passwds) Verify(user, passwd string) error {
 	if err != nil {
 		return fmt.Errorf("cannot identify algo %v", alg)
 	}
-	return verifyPass(passwd, pp[user], alg)
+	return alg.Match(passwd, pp[user])
-}
-
-func verifyPass(pass, hash string, alg HashAlgorithm) error {
-	switch alg {
-	case HashAPR1:
-		return verifyAPR1(pass, hash)
-	case HashBCrypt:
-		return bcrypt.CompareHashAndPassword([]byte(hash), []byte(pass))
-	case HashSHA:
-		return verifySHA(pass, hash)
-	case HashSSHA:
-		return verifySSHA(pass, hash)
-	case HashSHA256:
-		return verifySHA256(pass, hash)
-	case HashSHA512:
-		return verifySHA512(pass, hash)
-	}
-	return fmt.Errorf("unsupported hash algorithm %v", alg)
-}
-
-func verifyAPR1(password, hashedPassword string) error {
-	return apr1_crypt.New().Verify(hashedPassword, []byte(password))
-}
-
-func verifySHA(password, hashedPassword string) error {
-	eppS := hashedPassword[5:]
-	hash, err := base64.StdEncoding.DecodeString(eppS)
-
-	if err != nil {
-		return fmt.Errorf("cannot base64 decode")
-	}
-
-	sha := sha1.New()
-	_, err = sha.Write([]byte(password))
-
-	if err != nil {
-		return err
-	}
-
-	sum := sha.Sum(nil)
-
-	if !bytes.Equal(sum, hash) {
-		return fmt.Errorf("wrong password")
-	}
-	return nil
-}
-
-func verifySSHA(password, hashedPassword string) error {
-	eppS := hashedPassword[6:]
-	hash, err := base64.StdEncoding.DecodeString(eppS)
-
-	if err != nil {
-		return fmt.Errorf("cannot base64 decode")
 }
 
-	salt := hash[len(hash)-4:]
+// Write will cwrite the Passwd object to the given file
-	sha := sha1.New()
+func (pp Passwds) Write(file string) error {
-	_, err = sha.Write([]byte(password))
+	return os.WriteFile(file, pp.Bytes(), os.ModePerm)
-
-	if err != nil {
-		return err
 }
 
-	_, err = sha.Write(salt)
+// Bytes will return the Passwd as a byte slice
-
+func (pp Passwds) Bytes() []byte {
-	if err != nil {
-		return err
-	}
-
-	sum := sha.Sum(nil)
-
-	if !bytes.Equal(sum, hash[:len(hash)-4]) {
-		return fmt.Errorf("wrong password")
-	}
-
-	return nil
-}
-
-func verifySHA256(password, hashedPassword string) error {
-	eppS := hashedPassword[3:]
-	hash, err := base64.StdEncoding.DecodeString(eppS)
-
-	if err != nil {
-		return fmt.Errorf("cannot base64 decode")
-	}
-
-	sha := sha256.New()
-	_, err = sha.Write([]byte(password))
-
-	if err != nil {
-		return err
-	}
-
-	sum := sha.Sum(nil)
-
-	if !bytes.Equal(sum, hash) {
-		return fmt.Errorf("wrong password")
-	}
-	return nil
-}
-
-func verifySHA512(password, hashedPassword string) error {
-	eppS := hashedPassword[3:]
-	hash, err := base64.StdEncoding.DecodeString(eppS)
-
-	if err != nil {
-		return fmt.Errorf("cannot base64 decode")
-	}
-
-	sha := sha512.New()
-	_, err = sha.Write([]byte(password))
-
-	if err != nil {
-		return err
-	}
-
-	sum := sha.Sum(nil)
-
-	if !bytes.Equal(sum, hash) {
-		return fmt.Errorf("wrong password")
-	}
-	return nil
-}
-
-func (pp Passwds) toByte() []byte {
 	pass := []byte{}
 	for name, hash := range pp {
 		pass = append(pass, []byte(name+":"+hash+"\n")...)
@@ -300,113 +177,40 @@ func (pp Passwds) toByte() []byte {
 	return pass
 }
 
-func identifyHash(h string) (HashAlgorithm, error) {
+func identifyHash(h string) (Hasher, error) {
 	switch {
 	case strings.HasPrefix(h, "$2a$"), strings.HasPrefix(h, "$2y$"),
 		strings.HasPrefix(h, "$2x$"), strings.HasPrefix(h, "$2b$"):
-		return HashBCrypt, nil
+		return new(Bcrypt), nil
 	case strings.HasPrefix(h, "$apr1$"):
-		return HashAPR1, nil
+		return new(Apr1), nil
 	case strings.HasPrefix(h, "{SHA}"):
-		return HashSHA, nil
+		return new(Sha), nil
 	case strings.HasPrefix(h, "{SSHA}"):
-		return HashSSHA, nil
+		return new(Ssha), nil
 	case strings.HasPrefix(h, "$5$"):
-		return HashSHA256, nil
+		return new(Sha256), nil
 	case strings.HasPrefix(h, "$6$"):
-		return HashSHA512, nil
+		return new(Sha512), nil
 	}
 
-	return "", fmt.Errorf("unsupported hash algorithm")
+	return nil, fmt.Errorf("unsupported hash algorithm")
 }
 
-func createHash(passwd string, algo HashAlgorithm) (string, error) {
+func validLine(parts []string, lineNumber int, line string) (bool, error) {
-	hash := ""
-	prefix := ""
 	var err error
-	switch algo {
+	if len(parts) != 2 {
-	case HashAPR1:
+		err = errors.New(fmt.Sprintln("invalid line", lineNumber+1,
-		hash, err = hashApr1(passwd)
+			"unexpected number of parts split by", ":", len(parts),
-	case HashBCrypt:
+			"instead of 2 in\"", line, "\""))
-		hash, err = hashBcrypt(passwd)
+		return false, err
-	case HashSHA:
-		prefix = "{SHA}"
-		hash, err = hashSha(passwd)
-	case HashSSHA:
-		prefix = "{SSHA}"
-		hash, err = hashSSha(passwd)
-	case HashSHA256:
-		prefix = "$5$"
-		hash, err = hashSha256(passwd)
-	case HashSHA512:
-		prefix = "$6$"
-		hash, err = hashSha512(passwd)
-	}
-	if err != nil {
-		return "", err
-	}
-
-	return prefix + hash, nil
-}
-
-func hashApr1(passwd string) (string, error) {
-	return apr1_crypt.New().Generate([]byte(passwd), nil)
-}
-
-func hashBcrypt(passwd string) (string, error) {
-	passwordBytes, err := bcrypt.GenerateFromPassword([]byte(passwd), bcrypt.DefaultCost)
-	if err != nil {
-		return "", err
-	}
-	return string(passwordBytes), nil
-}
-
-func hashSha(passwd string) (string, error) {
-	s := sha1.New()
-	_, err := s.Write([]byte(passwd))
-	if err != nil {
-		return "", err
-	}
-	passwordSum := []byte(s.Sum(nil))
-	return base64.StdEncoding.EncodeToString(passwordSum), nil
-}
-
-func hashSha256(passwd string) (string, error) {
-	s := sha256.New()
-	_, err := s.Write([]byte(passwd))
-	if err != nil {
-		return "", err
-	}
-	passwordSum := []byte(s.Sum(nil))
-	return base64.StdEncoding.EncodeToString(passwordSum), nil
-}
-
-func hashSha512(passwd string) (string, error) {
-	s := sha512.New()
-	_, err := s.Write([]byte(passwd))
-	if err != nil {
-		return "", err
 	}
-	passwordSum := []byte(s.Sum(nil))
+	return true, nil
-	return base64.StdEncoding.EncodeToString(passwordSum), nil
 }
 
-func hashSSha(passwd string) (string, error) {
+func trimParts(parts []string) []string {
-	s := sha1.New()
+	for i, part := range parts {
-	_, err := s.Write([]byte(passwd))
+		parts[i] = strings.Trim(part, " ")
-	if err != nil {
-		return "", err
-	}
-	salt := make([]byte, 4)
-	_, err = rand.Read(salt)
-	if err != nil {
-		return "", err
-	}
-	_, err = s.Write([]byte(salt))
-	if err != nil {
-		return "", err
 	}
-	passwordSum := []byte(s.Sum(nil))
+	return parts
-	ret := append(passwordSum, salt...)
-	return base64.StdEncoding.EncodeToString(ret), nil
 }

htpasswd/htpasswd_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 )
 
-func TestParseHtpassd(t *testing.T) {
+func TestParseHtpasswd(t *testing.T) {
 	passwords, err := ParseHtpasswd([]byte("sha:{SHA}IRRjboXT92QSYXm8lpGPCZUvU1E=\n"))
 	if err != nil {
 		t.Fatal(err)
@@ -26,15 +26,15 @@ func TestCreateUser(t *testing.T) {
 	}
 	testCases := []struct {
 		user, password string
-		hash           HashAlgorithm
+		hash           Hasher
 		expected       error
 	}{
-		{"apr1", "123456@", HashAPR1, nil},
+		{"apr1", "123456@", new(Apr1), nil},
-		{"bcrypt", "123456@", HashBCrypt, nil},
+		{"bcrypt", "123456@", new(Bcrypt), nil},
-		{"ssha", "123456@", HashSSHA, nil},
+		{"ssha", "123456@", new(Ssha), nil},
-		{"sha", "123456@", HashSHA, nil},
+		{"sha", "123456@", new(Sha), nil},
-		{"sha256", "123456@", HashSHA256, nil},
+		{"sha256", "123456@", new(Sha256), nil},
-		{"sha512", "123456@", HashSHA512, nil},
+		{"sha512", "123456@", new(Sha512), nil},
 	}
 
 	for _, tc := range testCases {
@@ -71,13 +71,13 @@ func TestVerifyPassword(t *testing.T) {
 	for _, tc := range testCases {
 		err := VerifyUser(f.Name(), tc.user, tc.password)
 		if err != tc.expected {
-			t.Errorf("VerifyUser(%s %s, %s) = %v; want %v",
+			t.Errorf("VerifyUser(%v %v, %v) = %v; want %v",
 				f, tc.user, tc.password, err, tc.expected)
 		}
 	}
 }
 
-func TestVerify(t *testing.T) {
+func TestVerifyUser(t *testing.T) {
 	f, err := os.Stat("htpasswd_testdata")
 	if err != nil {
 		TestCreateUser(t)
@@ -87,8 +87,23 @@ func TestVerify(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	err = pp.Verify("bcrypt", "123456@")
+	testCases := []struct {
-	if err != nil {
+		user, password string
-		t.Fatalf(err.Error())
+		expected       error
+	}{
+		{"apr1", "123456@", nil},
+		{"bcrypt", "123456@", nil},
+		{"ssha", "123456@", nil},
+		{"sha", "123456@", nil},
+		{"sha256", "123456@", nil},
+		{"sha512", "123456@", nil},
+	}
+
+	for _, tc := range testCases {
+		err := pp.VerifyUser(tc.user, tc.password)
+		if err != tc.expected {
+			t.Errorf("VerifyUser(%s, %s) = %v; want %v",
+				tc.user, tc.password, err, tc.expected)
+		}
 	}
 }

htpasswd/htpasswd_testdata

@@ -1,6 +1,6 @@
-apr1:$apr1$v0FnbGJM$b2P3y1ltZYHakDaHrWx3N1
+bcrypt:$2a$10$YNEmQcVCrvcA8m1DNCwR9eXaTySDEa1sC/T5xUUTFnVnP.RIP3O2u
-bcrypt:$2a$10$pBSUext6NDsFYrm8GviW.OFe6SczH91INRC3YmsfE3HJp/fPmRaee
+ssha:{SSHA}fSLbdty+JHr+q3p/lHAPvNkOU3H8NLmI
-ssha:{SSHA}LoTRQgCdeGIeJ3nxDQMCmQSWdnMEsLqj
-sha512:$6$78RjySv19bx/knbdL6q1cpoV8WblZwc3x+wmPGQUvrSycxc4liKbksvDr9HZj76hgRuZZCyEngP+WEJmePArCQ==
 sha:{SHA}YEn9/RmoXLdbyB9TEDJ0OqWoPy8=
 sha256:$5$ufJ2S16IOhB6XLTGrVLqGQBKv/odjE3rypxnUDLqaS0=
+sha512:$6$78RjySv19bx/knbdL6q1cpoV8WblZwc3x+wmPGQUvrSycxc4liKbksvDr9HZj76hgRuZZCyEngP+WEJmePArCQ==
+apr1:$apr1$mO.FA9Gg$1LbPaKe7HCVHezEYzMCnn.

htpasswd/sha.go

@@ -0,0 +1,52 @@
+package htpasswd
+
+import (
+	"bytes"
+	"crypto/sha1"
+	"encoding/base64"
+	"fmt"
+)
+
+// Sha facilitates sha1 style hashing
+type Sha struct{}
+
+// Hash returns the hashed variant of the password or an error
+func (ss *Sha) Hash(passwd string) (string, error) {
+	s := sha1.New()
+	_, err := s.Write([]byte(passwd))
+	if err != nil {
+		return "", err
+	}
+	passwordSum := []byte(s.Sum(nil))
+	return ss.Prefix() + base64.StdEncoding.EncodeToString(passwordSum), nil
+}
+
+// Match verifier the hashed password using the original
+func (*Sha) Match(password, hashedPassword string) error {
+	eppS := hashedPassword[5:]
+	hash, err := base64.StdEncoding.DecodeString(eppS)
+
+	if err != nil {
+		return fmt.Errorf("cannot base64 decode")
+	}
+
+	sha := sha1.New()
+	_, err = sha.Write([]byte(password))
+
+	if err != nil {
+		return err
+	}
+
+	sum := sha.Sum(nil)
+
+	if !bytes.Equal(sum, hash) {
+		return fmt.Errorf("wrong password")
+	}
+	return nil
+}
+
+// Name returns the name of the hasher
+func (*Sha) Name() string { return "sha" }
+
+// Prefix returns the hasher's prefix
+func (*Sha) Prefix() string { return "{SHA}" }

htpasswd/sha256.go

@@ -0,0 +1,52 @@
+package htpasswd
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+)
+
+// Sha256 facilitates sha256 style hashing
+type Sha256 struct{}
+
+// Hash returns the hashed variant of the password or an error
+func (ss *Sha256) Hash(passwd string) (string, error) {
+	s := sha256.New()
+	_, err := s.Write([]byte(passwd))
+	if err != nil {
+		return "", err
+	}
+	passwordSum := []byte(s.Sum(nil))
+	return ss.Prefix() + base64.StdEncoding.EncodeToString(passwordSum), nil
+}
+
+// Match verifier the hashed password using the original
+func (*Sha256) Match(password, hashedPassword string) error {
+	eppS := hashedPassword[3:]
+	hash, err := base64.StdEncoding.DecodeString(eppS)
+
+	if err != nil {
+		return fmt.Errorf("cannot base64 decode")
+	}
+
+	sha := sha256.New()
+	_, err = sha.Write([]byte(password))
+
+	if err != nil {
+		return err
+	}
+
+	sum := sha.Sum(nil)
+
+	if !bytes.Equal(sum, hash) {
+		return fmt.Errorf("wrong password")
+	}
+	return nil
+}
+
+// Name returns the name of the hasher
+func (*Sha256) Name() string { return "sha256" }
+
+// Prefix returns the hasher's prefix
+func (*Sha256) Prefix() string { return "$5$" }

htpasswd/sha512.go

@@ -0,0 +1,52 @@
+package htpasswd
+
+import (
+	"bytes"
+	"crypto/sha512"
+	"encoding/base64"
+	"fmt"
+)
+
+// Sha512 facilitates sha512 style hashing
+type Sha512 struct{}
+
+// Hash returns the hashed variant of the password or an error
+func (ss *Sha512) Hash(passwd string) (string, error) {
+	s := sha512.New()
+	_, err := s.Write([]byte(passwd))
+	if err != nil {
+		return "", err
+	}
+	passwordSum := []byte(s.Sum(nil))
+	return ss.Prefix() + base64.StdEncoding.EncodeToString(passwordSum), nil
+}
+
+// Match verifier the hashed password using the original
+func (*Sha512) Match(password, hashedPassword string) error {
+	eppS := hashedPassword[3:]
+	hash, err := base64.StdEncoding.DecodeString(eppS)
+
+	if err != nil {
+		return fmt.Errorf("cannot base64 decode")
+	}
+
+	sha := sha512.New()
+	_, err = sha.Write([]byte(password))
+
+	if err != nil {
+		return err
+	}
+
+	sum := sha.Sum(nil)
+
+	if !bytes.Equal(sum, hash) {
+		return fmt.Errorf("wrong password")
+	}
+	return nil
+}
+
+// Name returns the name of the hasher
+func (*Sha512) Name() string { return "sha512" }
+
+// Prefix returns the hasher's prefix
+func (*Sha512) Prefix() string { return "$6$" }

htpasswd/ssha.go

@@ -0,0 +1,71 @@
+package htpasswd
+
+import (
+	"bytes"
+	"crypto/rand"
+	"crypto/sha1"
+	"encoding/base64"
+	"fmt"
+)
+
+// Ssha facilitates ssha style hashing
+type Ssha struct{}
+
+// Hash returns the hashed variant of the password or an error
+func (ss *Ssha) Hash(passwd string) (string, error) {
+	s := sha1.New()
+	_, err := s.Write([]byte(passwd))
+	if err != nil {
+		return "", err
+	}
+	salt := make([]byte, 4)
+	_, err = rand.Read(salt)
+	if err != nil {
+		return "", err
+	}
+	_, err = s.Write([]byte(salt))
+	if err != nil {
+		return "", err
+	}
+	passwordSum := []byte(s.Sum(nil))
+	ret := append(passwordSum, salt...)
+	return ss.Prefix() + base64.StdEncoding.EncodeToString(ret), nil
+}
+
+// Match verifier the hashed password using the original
+func (*Ssha) Match(password, hashedPassword string) error {
+	eppS := hashedPassword[6:]
+	hash, err := base64.StdEncoding.DecodeString(eppS)
+
+	if err != nil {
+		return fmt.Errorf("cannot base64 decode")
+	}
+
+	salt := hash[len(hash)-4:]
+	sha := sha1.New()
+	_, err = sha.Write([]byte(password))
+
+	if err != nil {
+		return err
+	}
+
+	_, err = sha.Write(salt)
+
+	if err != nil {
+		return err
+	}
+
+	sum := sha.Sum(nil)
+
+	if !bytes.Equal(sum, hash[:len(hash)-4]) {
+		return fmt.Errorf("wrong password")
+	}
+
+	return nil
+}
+
+// Name returns the name of the hasher
+func (*Ssha) Name() string { return "ssha" }
+
+// Prefix returns the hasher's prefix
+func (*Ssha) Prefix() string { return "{SSHA}" }