gnu: Add go-lukechampine-com-blake3.

* gnu/packages/golang.scm (go-lukechampine-com-blake3): New variable.

gnu/packages/golang.scm

@@ -8273,3 +8273,30 @@ the External Data Representation (XDR) standard protocol as specified in RFC
 friendly sizes.  It converts boring ugly numbers to human-friendly strings and
 back.")
     (license license:expat)))
+
+(define-public go-lukechampine-com-blake3
+  (package
+    (name "go-lukechampine-com-blake3")
+    (version "1.1.5")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/lukechampine/blake3")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "1yxdwp8dpnnq2wbwsxlkbq570i99sc6781y39czjxi9jh9z5nw55"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "lukechampine.com/blake3"))
+    (propagated-inputs
+     `(("go-github-com-klauspost-cpuid" ,go-github-com-klauspost-cpuid)))
+    (home-page "https://pkg.go.dev/lukechampine.com/blake3")
+    (synopsis "Implementation of the BLAKE3 cryptographic hash function")
+    (description "@code{blake3} implements the BLAKE3 cryptographic hash
+function.  In addition to the pure-Go implementation, this package also
+contains AVX-512 and AVX2 routines (generated by avo) that greatly increase
+performance for large inputs and outputs.")
+    (license license:expat)))