feat: also added ecdsa crypto key material

dummy-child-cert-ecdsa.pem

@@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE-----
+MIICAzCCAaqgAwIBAgIUKNWGvPrlzuYHnP4m6nGe60LalYEwCgYIKoZIzj0EAwIw
+ZTELMAkGA1UEBhMCVVMxDjAMBgNVBAgMBVN0YXRlMQ0wCwYDVQQHDARDaXR5MRcw
+FQYDVQQKDA5JbnRlcm1lZGlhdGVDQTEeMBwGA1UEAwwVSW50ZXJtZWRpYXRlIEVD
+RFNBIENBMB4XDTI0MTAxNzEzMDg0N1oXDTI2MTAxNzEzMDg0N1owWzELMAkGA1UE
+BhMCVVMxDjAMBgNVBAgMBVN0YXRlMQ0wCwYDVQQHDARDaXR5MRIwEAYDVQQKDAlF
+bmRFbnRpdHkxGTAXBgNVBAMMEEVuZCBFbnRpdHkgRUNEU0EwWTATBgcqhkjOPQIB
+BggqhkjOPQMBBwNCAATMkQg2RhaDYOWs+Ik/NKgZdwxm4BzagwVou6R73uiwXsRi
+QgJfhBxp01S3JI4E8AiboFf4uPRnRh0HGl9cUR+po0IwQDAdBgNVHQ4EFgQUz247
+eAeMuM2We19rA5HnLzyLZEUwHwYDVR0jBBgwFoAU6oYLh690kT1bIB3DUA/SGRim
+dXswCgYIKoZIzj0EAwIDRwAwRAIgI7cIpGzoiU1IoTYniEGXtK+WXq4Luv8k3BJQ
+W16RAVsCICnuLaRyH/5nA3mmciAiF5R9PKDzyBnJcPGuCM1tmEpN
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

dummy-child-key-ecdsa.pem

@@ -0,0 +1,8 @@
+-----BEGIN EC PARAMETERS-----
+BggqhkjOPQMBBw==
+-----END EC PARAMETERS-----
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIG20X4lI7vocwK2W3TYOW+XtQv/bwRWYknvAf2OK8WFJoAoGCCqGSM49
+AwEHoUQDQgAEzJEINkYWg2DlrPiJPzSoGXcMZuAc2oMFaLuke97osF7EYkICX4Qc
+adNUtySOBPAIm6BX+Lj0Z0YdBxpfXFEfqQ==
+-----END EC PRIVATE KEY-----

dummy-child-key-ecdsa.pem.license

@@ -0,0 +1,3 @@
+// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
+//
+// SPDX-License-Identifier: MIT

dummy-child-key-rsa.pem.license

@@ -0,0 +1,3 @@
+// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
+//
+// SPDX-License-Identifier: MIT

util_test.go

@@ -5,19 +5,23 @@
 package mail
 
 import (
+	"crypto/ecdsa"
 	"crypto/rsa"
 	"crypto/tls"
 	"crypto/x509"
 )
 
 const (
-	certFilePath = "dummy-chain-cert.pem"
-	keyFilePath  = "dummy-child-key.pem"
+	certRSAFilePath = "dummy-chain-cert-rsa.pem"
+	keyRSAFilePath  = "dummy-child-key-rsa.pem"
+
+	certECDSAFilePath = "dummy-chain-cert-ecdsa.pem"
+	keyECDSAFilePath  = "dummy-child-cert-ecdsa.pem"
 )
 
-// getDummyCryptoMaterial loads a certificate and a private key form local disk for testing purposes
-func getDummyCryptoMaterial() (*rsa.PrivateKey, *x509.Certificate, *x509.Certificate, error) {
-	keyPair, err := tls.LoadX509KeyPair(certFilePath, keyFilePath)
+// getDummyRSACryptoMaterial loads a certificate (RSA) and the associated private key (ECDSA) form local disk for testing purposes
+func getDummyRSACryptoMaterial() (*rsa.PrivateKey, *x509.Certificate, *x509.Certificate, error) {
+	keyPair, err := tls.LoadX509KeyPair(certRSAFilePath, keyRSAFilePath)
 	if err != nil {
 		return nil, nil, nil, err
 	}
@@ -36,3 +40,25 @@ func getDummyCryptoMaterial() (*rsa.PrivateKey, *x509.Certificate, *x509.Certifi
 
 	return privateKey, certificate, intermediateCertificate, nil
 }
+
+// getDummyECDSACryptoMaterial loads a certificate (ECDSA) and the associated private key (ECDSA) form local disk for testing purposes
+func getDummyECDSACryptoMaterial() (*ecdsa.PrivateKey, *x509.Certificate, *x509.Certificate, error) {
+	keyPair, err := tls.LoadX509KeyPair(certECDSAFilePath, keyECDSAFilePath)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	privateKey := keyPair.PrivateKey.(*ecdsa.PrivateKey)
+
+	certificate, err := x509.ParseCertificate(keyPair.Certificate[0])
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	intermediateCertificate, err := x509.ParseCertificate(keyPair.Certificate[1])
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	return privateKey, certificate, intermediateCertificate, nil
+}