diff --git a/js/crypto.go b/js/crypto.go
new file mode 100644
index 00000000..7128b965
--- /dev/null
+++ b/js/crypto.go
@@ -0,0 +1,29 @@
+package js
+
+import (
+	"crypto/sha1"
+
+	"github.com/robertkrimen/otto"
+)
+
+func cryptoSha1(call otto.FunctionCall) otto.Value {
+	argv := call.ArgumentList
+	argc := len(argv)
+	if argc != 1 {
+		return ReportError("Crypto.sha1: expected 1 argument, %d given instead.", argc)
+	}
+
+	arg := argv[0]
+	if (!arg.IsString()) {
+		return ReportError("Crypto.sha1: single argument must be a string.")
+	}
+
+	hasher := sha1.New()
+	hasher.Write([]byte(arg.String()))
+	v, err := otto.ToValue(string(hasher.Sum(nil)))
+	if err != nil {
+		return ReportError("Crypto.sha1: could not convert to string: %s", err)
+	}
+
+	return v
+}
diff --git a/js/data.go b/js/data.go
index e2bfe5b0..6fe48f22 100644
--- a/js/data.go
+++ b/js/data.go
@@ -8,25 +8,94 @@ import (
 	"github.com/robertkrimen/otto"
 )
 
-func btoa(call otto.FunctionCall) otto.Value {
-	varValue := base64.StdEncoding.EncodeToString([]byte(call.Argument(0).String()))
-	v, err := otto.ToValue(varValue)
+func textEncode(call otto.FunctionCall) otto.Value {
+	argv := call.ArgumentList
+	argc := len(argv)
+	if argc != 1 {
+		return ReportError("textEncode: expected 1 argument, %d given instead.", argc)
+	}
+
+	arg := argv[0]
+	if (!arg.IsString()) {
+		return ReportError("textEncode: single argument must be a string.")
+	}
+
+	encoded := []byte(arg.String())
+	vm := otto.New()
+	v, err := vm.ToValue(encoded)
 	if err != nil {
-		return ReportError("Could not convert to string: %s", varValue)
+		return ReportError("textEncode: could not convert to []uint8: %s", err.Error())
+	}
+
+	return v
+}
+
+func textDecode(call otto.FunctionCall) otto.Value {
+	argv := call.ArgumentList
+	argc := len(argv)
+	if argc != 1 {
+		return ReportError("textDecode: expected 1 argument, %d given instead.", argc)
+	}
+
+	arg, err := argv[0].Export()
+	if err != nil {
+		return ReportError("textDecode: could not export argument value: %s", err.Error())
+	}
+	byteArr, ok := arg.([]uint8)
+	if !ok {
+		return ReportError("textDecode: single argument must be of type []uint8.")
+	}
+
+	decoded := string(byteArr)
+	v, err := otto.ToValue(decoded)
+	if err != nil {
+		return ReportError("textDecode: could not convert to string: %s", err.Error())
+	}
+
+	return v
+}
+
+func btoa(call otto.FunctionCall) otto.Value {
+	argv := call.ArgumentList
+	argc := len(argv)
+	if argc != 1 {
+		return ReportError("btoa: expected 1 argument, %d given instead.", argc)
+	}
+
+	arg := argv[0]
+	if (!arg.IsString()) {
+		return ReportError("btoa: single argument must be a string.")
+	}
+
+	encoded := base64.StdEncoding.EncodeToString([]byte(arg.String()))
+	v, err := otto.ToValue(encoded)
+	if err != nil {
+		return ReportError("btoa: could not convert to string: %s", err.Error())
 	}
 
 	return v
 }
 
 func atob(call otto.FunctionCall) otto.Value {
-	varValue, err := base64.StdEncoding.DecodeString(call.Argument(0).String())
-	if err != nil {
-		return ReportError("Could not decode string: %s", call.Argument(0).String())
+	argv := call.ArgumentList
+	argc := len(argv)
+	if argc != 1 {
+		return ReportError("atob: expected 1 argument, %d given instead.", argc)
 	}
 
-	v, err := otto.ToValue(string(varValue))
+	arg := argv[0]
+	if (!arg.IsString()) {
+		return ReportError("atob: single argument must be a string.")
+	}
+
+	decoded, err := base64.StdEncoding.DecodeString(arg.String())
 	if err != nil {
-		return ReportError("Could not convert to string: %s", varValue)
+		return ReportError("atob: could not decode string: %s", err.Error())
+	}
+
+	v, err := otto.ToValue(string(decoded))
+	if err != nil {
+		return ReportError("atob: could not convert to string: %s", err.Error())
 	}
 
 	return v
@@ -39,7 +108,12 @@ func gzipCompress(call otto.FunctionCall) otto.Value {
 		return ReportError("gzipCompress: expected 1 argument, %d given instead.", argc)
 	}
 
-	uncompressedBytes := []byte(argv[0].String())
+	arg := argv[0]
+	if (!arg.IsString()) {
+		return ReportError("gzipCompress: single argument must be a string.")
+	}
+
+	uncompressedBytes := []byte(arg.String())
 
 	var writerBuffer bytes.Buffer
 	gzipWriter := gzip.NewWriter(&writerBuffer)
@@ -53,7 +127,7 @@ func gzipCompress(call otto.FunctionCall) otto.Value {
 
 	v, err := otto.ToValue(string(compressedBytes))
 	if err != nil {
-		return ReportError("Could not convert to string: %s", err.Error())
+		return ReportError("gzipCompress: could not convert to string: %s", err.Error())
 	}
 
 	return v
@@ -83,7 +157,7 @@ func gzipDecompress(call otto.FunctionCall) otto.Value {
 	decompressedBytes := decompressedBuffer.Bytes()
 	v, err := otto.ToValue(string(decompressedBytes))
 	if err != nil {
-		return ReportError("Could not convert to string: %s", err.Error())
+		return ReportError("gzipDecompress: could not convert to string: %s", err.Error())
 	}
 
 	return v
diff --git a/js/init.go b/js/init.go
index 6415dd88..1aaa52cd 100644
--- a/js/init.go
+++ b/js/init.go
@@ -27,10 +27,16 @@ func init() {
 	plugin.Defines["log_error"] = log_error
 	plugin.Defines["log_fatal"] = log_fatal
 
+	plugin.Defines["Crypto"] = map[string]interface{}{
+		"sha1": cryptoSha1,
+	}
+
 	plugin.Defines["btoa"] = btoa
 	plugin.Defines["atob"] = atob
 	plugin.Defines["gzipCompress"] = gzipCompress
 	plugin.Defines["gzipDecompress"] = gzipDecompress
+	plugin.Defines["textEncode"] = textEncode
+	plugin.Defines["textDecode"] = textDecode
 
 	plugin.Defines["httpRequest"] = httpRequest
 	plugin.Defines["http"] = httpPackage{}