Github issue #359

CMakeLists.txt

@@ -669,6 +669,15 @@ add_custom_target(check-junit-AesGcmEager
 
     DEPENDS accp-jar tests-jar)
 
+add_custom_target(check-junit-DifferentTempDir
+    COMMAND ${TEST_JAVA_EXECUTABLE}
+    -Dcom.amazon.corretto.crypto.provider.tmpdir=${CMAKE_BINARY_DIR}/tmpdir
+        ${TEST_RUNNER_ARGUMENTS}
+        --select-class=com.amazon.corretto.crypto.provider.test.AesTest
+        --select-class=com.amazon.corretto.crypto.provider.test.AesGcmKatTest
+
+    DEPENDS accp-jar tests-jar)
+
 add_custom_target(check-junit-extra-checks
     COMMAND ${TEST_JAVA_EXECUTABLE}
         -Dcom.amazon.corretto.crypto.provider.extrachecks=ALL
@@ -768,7 +777,8 @@ add_custom_target(check
     check-junit-SecurityManager
     check-external-lib
     check-junit-AesGcmLazy
-    check-junit-AesGcmEager)
+    check-junit-AesGcmEager
+    check-junit-DifferentTempDir)
 
 if(ENABLE_NATIVE_TEST_HOOKS)
     add_custom_target(check-keyutils

README.md

@@ -344,6 +344,9 @@ Thus, these should all be set on the JVM command line using `-D`.
   encryption/decryption operations would not require allocation and release of `EVP_CIPHER_CTX`
   structure. A common use case would be having long-running threads that each would get its
   own instance of `Cipher` class.
+* `com.amazon.corretto.crypto.provider.tmpdir`
+   Allows one to set the temporary directory used by ACCP when loading native libraries.
+   If this system property is not defined, the system property `java.io.tmpdir` is used.
 
 # License
 This library is licensed under the Apache 2.0 license although portions of this

src/com/amazon/corretto/crypto/provider/Loader.java

@@ -48,6 +48,8 @@ final class Loader {
   private static final String TEMP_DIR_PREFIX = "amazonCorrettoCryptoProviderNativeLibraries.";
   private static final String JNI_LIBRARY_NAME = "amazonCorrettoCryptoProvider";
   private static final String PROPERTY_VERSION_STR = "versionStr";
+
+  private static final String PROPERTY_TMP_DIR = "tmpdir";
   private static final String[] JAR_RESOURCES = {JNI_LIBRARY_NAME};
   private static final Pattern TEST_FILENAME_PATTERN =
       Pattern.compile("[-a-zA-Z0-9]+(\\.[a-zA-Z0-9]+)*");
@@ -431,7 +433,8 @@ private static byte[] bootstrapRng(int numBytes) throws IOException {
    * SecureRandom, which results in a circular dependency.
    */
   private static synchronized Path createPrivateTmpDir(final String prefix) throws IOException {
-    final Path systemTempDir = Paths.get(System.getProperty("java.io.tmpdir"));
+    final Path systemTempDir =
+        Paths.get(getProperty(PROPERTY_TMP_DIR, System.getProperty("java.io.tmpdir")));
 
     final int RETRY_LIMIT = 10;
     int attempt = 0;