providers: Add crypto provider with bcrypt comparison

providers/crypto/crypto.go

@@ -0,0 +1,28 @@
+package crypto
+
+import "html/template"
+import "golang.org/x/crypto/bcrypt"
+import "git.tebibyte.media/sashakoshka/step"
+
+var _ step.FuncProvider = new(Provider)
+
+// Provider provides cryptographic functions.
+type Provider struct {
+	
+}
+
+// Package fulfills the step.Provider interface.
+func (this *Provider) Package () string {
+	return "crypto"
+}
+
+// FuncMap fulfills the step.FuncProvider interface.
+func (this *Provider) FuncMap () template.FuncMap {
+	return template.FuncMap {
+		"bcryptCompare": funcBcryptCompare,
+	}
+}
+
+func funcBcryptCompare (hash string, text string) bool {
+	return bcrypt.CompareHashAndPassword([]byte(hash), []byte(text)) == nil
+}