diff --git a/Gopkg.lock b/Gopkg.lock
index f447496..5a3758a 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -58,7 +58,10 @@
 [[projects]]
   branch = "master"
   name = "github.com/pquerna/cachecontrol"
-  packages = [".","cacheobject"]
+  packages = [
+    ".",
+    "cacheobject"
+  ]
   revision = "0dec1b30a0215bb68605dfc568e8855066c9202d"
 
 [[projects]]
@@ -70,30 +73,60 @@
 [[projects]]
   branch = "master"
   name = "golang.org/x/crypto"
-  packages = ["ed25519","ed25519/internal/edwards25519"]
+  packages = [
+    "bcrypt",
+    "blowfish",
+    "ed25519",
+    "ed25519/internal/edwards25519"
+  ]
   revision = "9f005a07e0d31d45e6656d241bb5c0f2efd4bc94"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/net"
-  packages = ["context","context/ctxhttp"]
+  packages = [
+    "context",
+    "context/ctxhttp"
+  ]
   revision = "9dfe39835686865bff950a07b394c12a98ddc811"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/oauth2"
-  packages = [".","google","internal","jws","jwt"]
+  packages = [
+    ".",
+    "google",
+    "internal",
+    "jws",
+    "jwt"
+  ]
   revision = "9ff8ebcc8e241d46f52ecc5bff0e5a2f2dbef402"
 
 [[projects]]
   branch = "master"
   name = "google.golang.org/api"
-  packages = ["admin/directory/v1","gensupport","googleapi","googleapi/internal/uritemplates"]
+  packages = [
+    "admin/directory/v1",
+    "gensupport",
+    "googleapi",
+    "googleapi/internal/uritemplates"
+  ]
   revision = "8791354e7ab150705ede13637a18c1fcc16b62e8"
 
 [[projects]]
   name = "google.golang.org/appengine"
-  packages = [".","internal","internal/app_identity","internal/base","internal/datastore","internal/log","internal/modules","internal/remote_api","internal/urlfetch","urlfetch"]
+  packages = [
+    ".",
+    "internal",
+    "internal/app_identity",
+    "internal/base",
+    "internal/datastore",
+    "internal/log",
+    "internal/modules",
+    "internal/remote_api",
+    "internal/urlfetch",
+    "urlfetch"
+  ]
   revision = "150dc57a1b433e64154302bdc40b6bb8aefa313a"
   version = "v1.0.0"
 
@@ -105,13 +138,17 @@
 
 [[projects]]
   name = "gopkg.in/square/go-jose.v2"
-  packages = [".","cipher","json"]
+  packages = [
+    ".",
+    "cipher",
+    "json"
+  ]
   revision = "f8f38de21b4dcd69d0413faf231983f5fd6634b1"
   version = "v2.1.3"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "efab48a0e196c2a849bfbe9aa02d2ae28d281ce1bfe9f23720d648858eefc8e6"
+  inputs-digest = "b502c41a61115d14d6379be26b0300f65d173bdad852f0170d387ebf2d7ec173"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
index 97f83d0..c4005e1 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -38,3 +38,7 @@
 [[constraint]]
   name = "gopkg.in/fsnotify.v1"
   version = "~1.2.0"
+
+[[constraint]]
+  branch = "master"
+  name = "golang.org/x/crypto"
diff --git a/htpasswd.go b/htpasswd.go
index 6fd888e..c68e558 100644
--- a/htpasswd.go
+++ b/htpasswd.go
@@ -7,10 +7,12 @@ import (
 	"io"
 	"log"
 	"os"
+
+	"golang.org/x/crypto/bcrypt"
 )
 
-// lookup passwords in a htpasswd file
-// The entries must have been created with -s for SHA encryption
+// Lookup passwords in a htpasswd file
+// Passwords must be generated with -B for bcrypt or -s for SHA1.
 
 type HtpasswdFile struct {
 	Users map[string]string
@@ -47,14 +49,20 @@ func (h *HtpasswdFile) Validate(user string, password string) bool {
 	if !exists {
 		return false
 	}
-	if realPassword[:5] == "{SHA}" {
+
+	shaPrefix := realPassword[:5]
+	if shaPrefix == "{SHA}" {
+		shaValue := realPassword[5:]
 		d := sha1.New()
 		d.Write([]byte(password))
-		if realPassword[5:] == base64.StdEncoding.EncodeToString(d.Sum(nil)) {
-			return true
-		}
-	} else {
-		log.Printf("Invalid htpasswd entry for %s. Must be a SHA entry.", user)
+		return shaValue == base64.StdEncoding.EncodeToString(d.Sum(nil))
 	}
+
+	bcryptPrefix := realPassword[:4]
+	if bcryptPrefix == "$2a$" || bcryptPrefix == "$2b$" || bcryptPrefix == "$2x$" || bcryptPrefix == "$2y$" {
+		return bcrypt.CompareHashAndPassword([]byte(realPassword), []byte(password)) == nil
+	}
+
+	log.Printf("Invalid htpasswd entry for %s. Must be a SHA or bcrypt entry.", user)
 	return false
 }
diff --git a/htpasswd_test.go b/htpasswd_test.go
index 17ce37b..ebfd503 100644
--- a/htpasswd_test.go
+++ b/htpasswd_test.go
@@ -2,11 +2,14 @@ package main
 
 import (
 	"bytes"
-	"github.com/stretchr/testify/assert"
+	"fmt"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/crypto/bcrypt"
 )
 
-func TestHtpasswd(t *testing.T) {
+func TestSHA(t *testing.T) {
 	file := bytes.NewBuffer([]byte("testuser:{SHA}PaVBVZkYqAjCQCu6UBL2xgsnZhw=\n"))
 	h, err := NewHtpasswd(file)
 	assert.Equal(t, err, nil)
@@ -14,3 +17,21 @@ func TestHtpasswd(t *testing.T) {
 	valid := h.Validate("testuser", "asdf")
 	assert.Equal(t, valid, true)
 }
+
+func TestBcrypt(t *testing.T) {
+	hash1, err := bcrypt.GenerateFromPassword([]byte("password"), 1)
+	hash2, err := bcrypt.GenerateFromPassword([]byte("top-secret"), 2)
+	assert.Equal(t, err, nil)
+
+	contents := fmt.Sprintf("testuser1:%s\ntestuser2:%s\n", hash1, hash2)
+	file := bytes.NewBuffer([]byte(contents))
+
+	h, err := NewHtpasswd(file)
+	assert.Equal(t, err, nil)
+
+	valid := h.Validate("testuser1", "password")
+	assert.Equal(t, valid, true)
+
+	valid = h.Validate("testuser2", "top-secret")
+	assert.Equal(t, valid, true)
+}
diff --git a/main.go b/main.go
index 4e4c7ed..287dc48 100644
--- a/main.go
+++ b/main.go
@@ -52,7 +52,7 @@ func main() {
 	flagSet.String("client-id", "", "the OAuth Client ID: ie: \"123456.apps.googleusercontent.com\"")
 	flagSet.String("client-secret", "", "the OAuth Client Secret")
 	flagSet.String("authenticated-emails-file", "", "authenticate against emails via file (one per line)")
-	flagSet.String("htpasswd-file", "", "additionally authenticate against a htpasswd file. Entries must be created with \"htpasswd -s\" for SHA encryption")
+	flagSet.String("htpasswd-file", "", "additionally authenticate against a htpasswd file. Entries must be created with \"htpasswd -s\" for SHA encryption or \"htpasswd -B\" for bcrypt encryption")
 	flagSet.Bool("display-htpasswd-form", true, "display username / password login form if an htpasswd file is provided")
 	flagSet.String("custom-templates-dir", "", "path to custom html templates")
 	flagSet.String("footer", "", "custom footer string. Use \"-\" to disable default footer.")