feat(unikraft): Add ukrandom library parameters

Signed-off-by: Cezar Craciunoiu <[email protected]>

unikraft/export/v0/ukrandom/library.go

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2024, Unikraft GmbH and The KraftKit Authors.
+// Licensed under the BSD-3-Clause License (the "License").
+// You may not use this file except in compliance with the License.
+package ukrandom
+
+const LibraryName = "ukrandom"

unikraft/export/v0/ukrandom/params.go

@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2024, Unikraft GmbH and The KraftKit Authors.
+// Licensed under the BSD-3-Clause License (the "License").
+// You may not use this file except in compliance with the License.
+package ukrandom
+
+import (
+	"crypto/rand"
+	"fmt"
+	"strings"
+
+	"kraftkit.sh/unikraft/export/v0/ukargparse"
+)
+
+var ParamRandomSeed = ukargparse.NewParamStrSlice("random", "seed", nil)
+
+// ExportedParams returns the parameters available by this exported library.
+func ExportedParams() []ukargparse.Param {
+	return []ukargparse.Param{
+		ParamRandomSeed,
+	}
+}
+
+// RandomSeed are the 10 bytes that are required by the ukrandom library.
+type RandomSeed [10]byte
+
+// NewRandomSeed generates a new set of true random bytes or nothing if error.
+func NewRandomSeed() RandomSeed {
+	randomBytes := make([]byte, 10)
+	_, err := rand.Read(randomBytes)
+	if err != nil {
+		return RandomSeed{}
+	}
+
+	var random RandomSeed
+	for i := 0; i < 10; i++ {
+		random[i] = randomBytes[i]
+	}
+
+	return random
+}
+
+// String implements fmt.Stringer and returns a valid set of random bytes.
+func (rng RandomSeed) String() string {
+	var sb strings.Builder
+
+	sb.WriteString("[ ")
+	for i := 0; i < 10; i++ {
+		sb.WriteString(fmt.Sprintf("%02x ", rng[i]))
+	}
+	sb.WriteString("]")
+
+	return sb.String()
+}