add SignatureAlgorithm

Signed-off-by: alperozturk <[email protected]>

Author: alperozturk96

library/src/androidTest/java/com/owncloud/android/lib/resources/e2ee/SendCSRRemoteOperationIT.kt

@@ -35,7 +35,7 @@ class SendCSRRemoteOperationIT : AbstractIT() {
         val keyPair = keyGen.genKeyPair()
 
         // create CSR
-        val urlEncoded: String = CsrHelper().generateCsrPemEncodedString(keyPair, client.userId)
+        val urlEncoded: String = CsrHelper().generateCsrPemEncodedString(keyPair, client.userId, SignatureAlgorithm.SHA1)
 
         val operation = SendCSRRemoteOperation(urlEncoded)
         var result = operation.execute(nextcloudClient)

library/src/main/java/com/owncloud/android/lib/resources/e2ee/CsrHelper.kt

@@ -38,16 +38,18 @@ class CsrHelper {
      *
      * @param keyPair the KeyPair with private and public keys
      * @param userId  userId of CSR owner
+     * @param algorithm represents supported signature algorithm
      * @return PEM encoded CSR string
      * @throws IOException               thrown if key cannot be created
      * @throws OperatorCreationException thrown if contentSigner cannot be build
      */
     @Throws(IOException::class, OperatorCreationException::class)
     fun generateCsrPemEncodedString(
         keyPair: KeyPair,
-        userId: String
+        userId: String,
+        algorithm: SignatureAlgorithm
     ): String {
-        val csr = generateCSR(keyPair, userId)
+        val csr = generateCSR(keyPair, userId, algorithm)
         val derCSR = csr.encoded
         return "-----BEGIN CERTIFICATE REQUEST-----\n" +
             Base64.encodeToString(
@@ -61,6 +63,7 @@ class CsrHelper {
      *
      * @param keyPair the KeyPair with private and public keys
      * @param userId  userId of CSR owner
+     * @param algorithm represents supported signature algorithm
      * @return PKCS10CertificationRequest with the certificate signing request (CSR) data
      * @throws IOException               thrown if key cannot be created
      * @throws OperatorCreationException thrown if contentSigner cannot be build
@@ -69,12 +72,13 @@ class CsrHelper {
     @Throws(IOException::class, OperatorCreationException::class)
     private fun generateCSR(
         keyPair: KeyPair,
-        userId: String
+        userId: String,
+        algorithm: SignatureAlgorithm
     ): PKCS10CertificationRequest {
         val principal = "CN=$userId"
         val privateKey = PrivateKeyFactory.createKey(keyPair.private.encoded)
-        val signatureAlgorithm = DefaultSignatureAlgorithmIdentifierFinder().find("SHA1WITHRSA")
-        val digestAlgorithm = DefaultDigestAlgorithmIdentifierFinder().find("SHA-1")
+        val signatureAlgorithm = DefaultSignatureAlgorithmIdentifierFinder().find(algorithm.signatureAlg)
+        val digestAlgorithm = DefaultDigestAlgorithmIdentifierFinder().find(algorithm.digestAlg)
         val signer =
             BcRSAContentSignerBuilder(signatureAlgorithm, digestAlgorithm).build(privateKey)
         val csrBuilder: PKCS10CertificationRequestBuilder =

library/src/main/java/com/owncloud/android/lib/resources/e2ee/SignatureAlgorithm.kt

@@ -0,0 +1,13 @@
+/*
+ * Nextcloud Android Library
+ *
+ * SPDX-FileCopyrightText: 2025 Alper Ozturk <[email protected]>
+ * SPDX-License-Identifier: MIT
+ */
+
+package com.owncloud.android.lib.resources.e2ee
+
+enum class SignatureAlgorithm(val signatureAlg: String, val digestAlg: String) {
+    SHA1("SHA1WITHRSA", "SHA-1"),
+    SHA256("SHA256WITHRSA", "SHA-256")
+}