added no key version for part 3

part3/speed-test-nokey.py

@@ -0,0 +1,102 @@
+# The only difference between these two files is this one does _not_ generate a new key for every run.
+# The other file (speed-test.py) does generate a new key for every run and it makes the RSA encryption test take _much_ longer.
+
+from Crypto.PublicKey import RSA
+from Crypto.Cipher import PKCS1_OAEP, AES
+from Crypto.Util.Padding import pad, unpad
+from Crypto.Random import get_random_bytes
+
+import time
+
+plaintext = input("Please input the test message: ").encode()
+IV = b'0' * 16
+
+def encrypt_aes(key: bytes, plaintext: bytes) -> bytes:
+    plaintext = pad(plaintext, 16)
+
+    cipher = AES.new(key, AES.MODE_CBC, iv=IV)
+
+    return cipher.encrypt(plaintext)
+
+def decrypt_aes(key: bytes, ciphertext: bytes) -> bytes:
+
+    cipher = AES.new(key, AES.MODE_CBC, iv=IV)
+
+    return unpad(cipher.decrypt(ciphertext), 16)
+
+
+
+for size in (128, 192, 256):
+
+    e_times = []
+    d_times = []
+
+    for n in range(100):
+        aes_key = get_random_bytes(size // 8)
+
+        start = time.time()
+        ciphertext = encrypt_aes(aes_key, plaintext)
+        end = time.time()
+
+        e_times.append(end - start)
+
+        start = time.time()
+        decrypt_aes(aes_key, ciphertext)
+        end = time.time()
+
+        d_times.append(end - start)
+
+    e_avg = sum(e_times) / len(e_times)
+    d_avg = sum(d_times) / len(d_times)
+
+    print(f'AES {size} key encrpytion average: {e_avg * 1000} ms')
+    print(f'AES {size} key decryption average: {d_avg * 1000} ms\n')
+
+def encrypt_rsa(public_key: bytes, plaintext: bytes) -> bytes:
+    cipher = PKCS1_OAEP.new(public_key)
+    return cipher.encrypt(plaintext)
+
+def decrypt_rsa(private_key: bytes, ciphertext: bytes) -> bytes:
+    cipher = PKCS1_OAEP.new(private_key)
+    return cipher.decrypt(ciphertext)
+
+for size in (1024, 2048, 4096):
+
+    e_times = []
+    d_times = []
+
+    key = RSA.generate(size)
+    private_key = key
+    public_key = key.publickey()
+
+    for n in range(100):
+
+        start = time.time()
+        ciphertext = encrypt_rsa(public_key, plaintext)
+        end = time.time()
+        e_times.append(end - start)
+
+        start = time.time()
+        decrypt_rsa(private_key, ciphertext)
+        end = time.time()
+        d_times.append(end - start)
+
+    e_avg = sum(e_times) / len(e_times)
+    d_avg = sum(d_times) / len(d_times)
+
+    print(f'RSA {size} key encrpytion average: {e_avg * 1000} ms')
+    print(f'RSA {size} key decryption average: {d_avg * 1000} ms\n')
+
+
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