What's wrong? Python RSA decryption/

Question

decrypt_message1+=decrypt_message[i]

TypeError: can't concat bytes to int.

decrypt_message1 and decrypt_message[i] are both bytes

if int(length)>=1:
    for i in range(int(length)+1):
        decrypt_message1=""
        if i<int(length)+1:
            decrypt_message1=decrypt_message1.encode()
            for i in range(50):
                decrypt_message1+=decrypt_message[i]
            try:
                decrypt = rsa.decrypt(decrypt_message1, privkey)
            except Exception as E:
                print(E)
            decrypt=decrypt.decode()
            text1.insert(END,decrypt)
        else:
            decrypt_message1=decrypt_message1.encode()
            for i in range(len(message)-int(length)*20):
                decrypt_message1+=decrypt_message[i]
            try:
                decrypt = rsa.decrypt(decrypt_message1, privkey)
            except Exception as E:
                print(E)
            decrypt=decrypt.decode()
            text1.insert(END,decrypt)

Bakuriu · Accepted Answer · 2014-06-25 18:10:30Z

1

decrypt_message[i] is not a bytes object. It's an int:

>>> b"hello"[0]
104

Change:

decrypt_message1=decrypt_message1.encode()
for i in range(50):
    decrypt_message1+=decrypt_message[i]

to:

decrypt_message1=decrypt_message1.encode()
decrypt_message1 += decrypt_message[:50]

Simple subscripts with an index in bytes return the integer value stored at that position. Slicing returns a bytes object. See the difference between:

>>> b"hello"[0]
104

and:

>>> b"hello"[:1]
b'h'

answered Jun 25, 2014 at 18:10

Bakuriu

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Comments

Alex W · Accepted Answer · 2014-06-25 18:09:11Z

0

I believe it may be the += operator causing issues because it invokes __iadd__ instead of __add__.

Try decrypt_message1 = decrypt_message1 + decrypt_message[i]

answered Jun 25, 2014 at 18:09

Alex W

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