Add gen key crypto helper

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/crypto/keys/keys.go

@@ -0,0 +1,55 @@
+// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+// Package keys provides utilities for generating cryptographic keys
+package keys
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"fmt"
+)
+
+// Type represents the type of cryptographic key
+type Type string
+
+const (
+	// TypeEC256 represents ECDSA with P-256 curve
+	TypeEC256 Type = "EC256"
+	// TypeEC384 represents ECDSA with P-384 curve
+	TypeEC384 Type = "EC384"
+	// TypeRSA2048 represents RSA with 2048-bit key
+	TypeRSA2048 Type = "RSA2048"
+	// TypeRSA4096 represents RSA with 4096-bit key
+	TypeRSA4096 Type = "RSA4096"
+)
+
+// Generate creates a new private key of the specified type
+func Generate(keyType Type) (crypto.Signer, error) {
+	switch keyType {
+	case TypeEC256:
+		return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	case TypeEC384:
+		return ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
+	case TypeRSA2048:
+		return rsa.GenerateKey(rand.Reader, 2048)
+	case TypeRSA4096:
+		return rsa.GenerateKey(rand.Reader, 4096)
+	default:
+		return nil, fmt.Errorf("unsupported key type: %s", keyType)
+	}
+}