[#3175] added jsvm crypto primitives

tools/security/crypto.go

@@ -0,0 +1,41 @@
+package security
+
+import (
+	"crypto/md5"
+	"crypto/sha256"
+	"crypto/sha512"
+	"encoding/base64"
+	"fmt"
+	"strings"
+)
+
+// S256Challenge creates base64 encoded sha256 challenge string derived from code.
+// The padding of the result base64 string is stripped per [RFC 7636].
+//
+// [RFC 7636]: https://datatracker.ietf.org/doc/html/rfc7636#section-4.2
+func S256Challenge(code string) string {
+	h := sha256.New()
+	h.Write([]byte(code))
+	return strings.TrimRight(base64.URLEncoding.EncodeToString(h.Sum(nil)), "=")
+}
+
+// MD5 creates md5 hash from the provided plain text.
+func MD5(text string) string {
+	h := md5.New()
+	h.Write([]byte(text))
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+// SHA256 creates sha256 hash as defined in FIPS 180-4 from the provided text.
+func SHA256(text string) string {
+	h := sha256.New()
+	h.Write([]byte(text))
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+// SHA512 creates sha512 hash as defined in FIPS 180-4 from the provided text.
+func SHA512(text string) string {
+	h := sha512.New()
+	h.Write([]byte(text))
+	return fmt.Sprintf("%x", h.Sum(nil))
+}