gnu: Add rust-p256-0.13.

* gnu/packages/crates-io.scm (rust-p256-0.13): New variable.

gnu/packages/crates-io.scm

@@ -42425,6 +42425,43 @@ owner with them.  This can sometimes be useful because Rust borrowing rules
 normally prevent moving a type that has been borrowed from.")
     (license license:expat)))
 
+(define-public rust-p256-0.13
+  (package
+    (name "rust-p256")
+    (version "0.13.2")
+    (source (origin
+              (method url-fetch)
+              (uri (crate-uri "p256" version))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0jyd3c3k239ybs59ixpnl7dqkmm072fr1js8kh7ldx58bzc3m1n9"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-ecdsa" ,rust-ecdsa-0.16)
+        ("rust-elliptic-curve" ,rust-elliptic-curve-0.13)
+        ("rust-hex-literal" ,rust-hex-literal-0.4)
+        ("rust-primeorder" ,rust-primeorder-0.13)
+        ("rust-serdect" ,rust-serdect-0.2)
+        ("rust-sha2" ,rust-sha2-0.10))
+       #:cargo-development-inputs
+       (("rust-blobby" ,rust-blobby-0.3)
+        ("rust-criterion" ,rust-criterion-0.4)
+        ("rust-ecdsa" ,rust-ecdsa-0.16)
+        ("rust-hex-literal" ,rust-hex-literal-0.4)
+        ("rust-primeorder" ,rust-primeorder-0.13)
+        ("rust-proptest" ,rust-proptest-1)
+        ("rust-rand-core" ,rust-rand-core-0.6))))
+    (home-page
+     "https://github.com/RustCrypto/elliptic-curves/tree/master/p256")
+    (synopsis "Pure Rust implementation of the NIST P-256")
+    (description
+     "This package provides a pure Rust implementation of the NIST P-256 (a.k.a.
+secp256r1, prime256v1) elliptic curve as defined in SP 800-186, with support for
+ECDH, ECDSA signing/verification, and general purpose curve arithmetic.")
+    (license (list license:asl2.0 license:expat))))
+
 (define-public rust-p384-0.13
   (package
     (name "rust-p384")