diff --git a/tests/data_files/pkcs7-rsa-sha256-3.key b/tests/data_files/pkcs7-rsa-sha256-3.key
new file mode 100644
index 0000000..3cdc717
--- /dev/null
+++ b/tests/data_files/pkcs7-rsa-sha256-3.key
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----