Question

全晚，

我想使用Public Key加密验证文件，但我无法弄清楚为什么我会为下面的代码收到类型错误，请注意signatureLength = 512

signature = f[:signatureLength]
f = open('lib/publicKey.pem','rb')
publicKey = RSA.importKey(f.read())
hash = SHA512.new(f[signatureLength:])
verification = PKCS1_PSS.new(publicKey)

具体错误是：

  File "C:\Users\Zach Newton\Desktop\pp\lib\files.py", line 77, in verify_file
    hash = SHA512.new(f[signatureLength:])
TypeError: '_io.BufferedReader' object is not subscriptable

Answer 1

您正在重新分配名称f：

signature = f[:signatureLength]
f = open('lib/publicKey.pem','rb')
publicKey = RSA.importKey(f.read())
hash = SHA512.new(f[signatureLength:]) # <-- this isn't the same f anymore
verification = PKCS1_PSS.new(publicKey)

你应该使用这样的东西：

signature = f[:signatureLength]
with open('lib/publicKey.pem','rb') as pubkeyfile:
    publicKey = RSA.importKey(pubkeyfile.read())
hash = SHA512.new(signature)
verification = PKCS1_PSS.new(publicKey)

出于这个原因，使用通用变量名称如f并且不鼓励使用名称来完全不同。

使用pyCryto创建SHA512哈希时的TypeError

1 个答案: