Add md5sum function to crypto library

.gitignore

@@ -1,2 +1,3 @@
 vendor/
 /.glide
+.idea

crypto.go

@@ -10,6 +10,7 @@ import (
 	"crypto/ed25519"
 	"crypto/elliptic"
 	"crypto/hmac"
+	"crypto/md5"
 	"crypto/rand"
 	"crypto/rsa"
 	"crypto/sha1"
@@ -73,6 +74,11 @@ func hashSha(password string) string {
 	return base64.StdEncoding.EncodeToString(passwordSum)
 }
 
+func md5sum(input string) string {
+	hash := md5.Sum([]byte(input))
+	return hex.EncodeToString(hash[:])
+}
+
 // HashAlgorithm enum for hashing algorithms
 type HashAlgorithm string
 

crypto_test.go

@@ -47,6 +47,13 @@ func TestSha1Sum(t *testing.T) {
 	}
 }
 
+func TestMd5Sum(t *testing.T) {
+	tpl := `{{"abc" | md5sum}}`
+	if err := runt(tpl, "900150983cd24fb0d6963f7d28e17f72"); err != nil {
+		t.Error(err)
+	}
+}
+
 func TestAdler32Sum(t *testing.T) {
 	tpl := `{{"abc" | adler32sum}}`
 	if err := runt(tpl, "38600999"); err != nil {

docs/crypto.md

@@ -267,3 +267,11 @@ algorithm and returns the decoded text.
 ```
 "30tEfhuJSVRhpG97XCuWgz2okj7L8vQ1s6V9zVUPeDQ=" | decryptAES "secretkey"
 ```
+
+## md5sum
+
+The `md5sum` function receives a string, and computes it's MD5 digest.
+
+```
+md5sum "Hello world!"
+```

functions.go

@@ -163,6 +163,7 @@ var genericMap = map[string]interface{}{
 	"sha256sum":  sha256sum,
 	"sha512sum":  sha512sum,
 	"adler32sum": adler32sum,
+	"md5sum":     md5sum,
 	"toString":   strval,
 
 	// Wrap Atoi to stop errors.