test: add test for PKCS1OAEP_Cipher with gmpy2 (#3760)

api/tests/unit_tests/libs/test_rsa.py

@@ -0,0 +1,29 @@
+import rsa as pyrsa
+from Crypto.PublicKey import RSA
+
+from libs import gmpy2_pkcs10aep_cipher
+
+
+def test_gmpy2_pkcs10aep_cipher() -> None:
+    rsa_key_pair = pyrsa.newkeys(2048)
+    public_key = rsa_key_pair[0].save_pkcs1()
+    private_key = rsa_key_pair[1].save_pkcs1()
+
+    public_rsa_key = RSA.import_key(public_key)
+    public_cipher_rsa2 = gmpy2_pkcs10aep_cipher.new(public_rsa_key)
+
+    private_rsa_key = RSA.import_key(private_key)
+    private_cipher_rsa = gmpy2_pkcs10aep_cipher.new(private_rsa_key)
+
+    raw_text = 'raw_text'
+    raw_text_bytes = raw_text.encode()
+
+    # RSA encryption by public key and decryption by private key
+    encrypted_by_pub_key = public_cipher_rsa2.encrypt(message=raw_text_bytes)
+    decrypted_by_pub_key = private_cipher_rsa.decrypt(encrypted_by_pub_key)
+    assert decrypted_by_pub_key == raw_text_bytes
+
+    # RSA encryption and decryption by private key
+    encrypted_by_private_key = private_cipher_rsa.encrypt(message=raw_text_bytes)
+    decrypted_by_private_key = private_cipher_rsa.decrypt(encrypted_by_private_key)
+    assert decrypted_by_private_key == raw_text_bytes