gnu: Add rust-signature-1.

* gnu/packages/crates-io.scm (rust-signature-1): New variable.

gnu/packages/crates-io.scm

@@ -26039,6 +26039,33 @@ words, like Python's shlex.")
     (description "Backend crate for signal-hook.")
     (license (list license:asl2.0 license:expat))))
 
+(define-public rust-signature-1
+  (package
+    (name "rust-signature")
+    (version "1.2.2")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "signature" version))
+        (file-name (string-append name "-" version ".tar.gz"))
+        (sha256
+          (base32 "04325sgl06mksq21a95sbdadg3r3jn3l3nhhxj839qs7s6kn1w19"))))
+    (build-system cargo-build-system)
+    (arguments
+      `(#:skip-build? #t
+        #:cargo-inputs
+        (("rust-digest" ,rust-digest-0.9)
+         ("rust-rand-core" ,rust-rand-core-0.5)
+         ("rust-signature-derive"
+          ,rust-signature-derive-1))))
+    (home-page "")
+    (synopsis "Traits for cryptographic signature algorithms (e.g. ECDSA,
+Ed25519)")
+    (description
+      "This package contains traits which provide generic, object-safe APIs
+for generating and verifying digital signatures.")
+    (license (list license:asl2.0 license:expat))))
+
 (define-public rust-signature-derive-1
   (package
     (name "rust-signature-derive")