1 files changed, 29 insertions, 0 deletions
diff --git a/final/rsa-decrypt.py b/final/rsa-decrypt.py
new file mode 100644
index 0000000..39a2720
--- /dev/null
+++ b/final/rsa-decrypt.py
@@ -0,0 +1,29 @@
+encrypted = [340, 316, 145, 278, 250, 435, 321, 109, 115, 490, 156, 212, 122, 288, 287, 164, 225] # Directly from demo output of encrypted
+p = int(input('prime 1: '))
+q = int(input('prime 2: '))
+n = p*q
+tot = (p-1)*(q-1)
+e = int(input('e: '))
+
+# Calculate d such that ed == 1 mod tot
+d = 1 # Guess
+while (e*d % tot != 1):
+  d += 1
+# Algorithm is currently extremely dumb
+
+def decrypt_block(blk):
+  return blk**d % n
+
+decrypted = [decrypt_block(block) for block in encrypted]
+
+messagenum = 0
+for blockind in range(len(decrypted)):
+  block = decrypted[blockind]
+  messagenum += block * n ** blockind
+
+message = ''
+while messagenum > 0:
+  message = chr(messagenum%128) + message
+  messagenum = (messagenum-messagenum%128)//128
+
+print(message)