使用PGPy加密/解密消息

Question

我正在尝试PGPy，每当加密或解密消息时都会出错。

这些是我使用的代码。文件和示例可以在这里找到

使用公钥加密消息的代码：

import pgpy
key_pub = '''BEGIN PUBLIC KEY BLOCK...END PUBLIC KEY BLOCK'''.lstrip()
message = "It worked!"
# import ASCII formatted public key
pub_key = pgpy.PGPKey()
pub_key.parse(key_pub)
# create new message
text_message = pgpy.PGPMessage.new(message)
# encrypt a message using pub key
encrypted_message = pub_key.encrypt(text_message)
print(encrypted_message)

这一个给出了输出，但带有信息

UserWarning: Selected compression algorithm not in key preferences
encrypted_message = pub_key.encrypt(text_message)

我不明白为什么
使用私钥解密消息的代码：

import pgpy
key_priv ='''*BEGIN PRIV KEY BLOCK...END PRIV KEY BLOCK'''.lstrip()
cipher_text = '''BEGIN PGP MESSAGE...END PGP MESSAGE'''.lstrip()
# import ASCII formatted private key
priv_key = pgpy.PGPKey()
priv_key.parse(key_priv)
message_from_blob = pgpy.PGPMessage.from_blob(cipher_text)
# decrypts a message using priv key
decrypted_message = priv_key.decrypt(cipher_text)
print(decrypted_message)

而这个根本不起作用。这就是我犯的错误。

Traceback (most recent call last):
File "C:/Users..practice.py", line 13, in <module>
decrypted_message = priv_key.decrypt(cipher_text)
File "C:Users...venvlibsite-packagespgpydecorators.py", line 126, in _action
self.check_attributes(key)
File "C:Users...venvlibsite-packagespgpydecorators.py", line 111, in check_attributes
raise PGPError("Expected: {attr:s} == {eval:s}. Got: {got:s}"
pgpy.errors.PGPError: Expected: is_unlocked == True. Got: False

Answer 1

1. 假设您有RSA公钥和私钥，加密字符串或文件可以简单地完成：

PUBLIC_KEY_FILE = 'path/to/keyfile/my_pub_key.asc'    
pub_key, _ = pgpy.PGPKey.from_file(str(PUBLIC_KEY_FILE))

# Encrypt string
txt_msg = pgpy.PGPMessage.new("Hello PGPy World")
print('txt_msg.is_encrypted')
print(txt_msg.is_encrypted)
print('txt_msg.message')
print(txt_msg.message)
encrypted_txt_msg = pub_key.encrypt(txt_msg)
print('encrypted_txt_msg.is_encrypted')
print(encrypted_txt_msg.is_encrypted)
print('encrypted_txt_msg.message')
print(encrypted_txt_msg.message)

# Encrypt file
f_t_e = pgpy.PGPMessage.new(str(FILE_TO_ENCRYPT),file=True)
print('f_t_e.is_encrypted')
print(f_t_e.is_encrypted)
encrypted_f_t_e = pub_key.encrypt(f_t_e)
print('encrypted_f_t_e.is_encoded')
print(encrypted_f_t_e.is_encrypted)

2. 假设您有与上述公钥关联的RSA私钥(在收件人列表中(和包含密码短语的文本文件，解密字符串或文件非常简单：

# Load passphrase from file
with open(PASSPHRASE_FILE,'r') as ppfp:
PASSPHRASE = ppfp.readline().replace('n','')
print(PASSPHRASE)

# Load private key
PRIVATE_KEY_FILE='path/to/keyfile/my_prv_key.gpg'
prv_key, _ = pgpy.PGPKey.from_file(str(PRIVATE_KEY_FILE))
# Unlock private key
print(prv_key.is_protected)  # Should be True
with prv_key.unlock(PASSPHRASE):
print(prv_key.is_unlocked)  #Should be True
# Decrypt string
decrypted_txt_msg = prv_key.decrypt(encrypted_txt_msg)
print('decrypted_txt_msg.is_encrypted')
print(decrypted_txt_msg.is_encrypted)
print('decrypted_txt_msg.message')
print(decrypted_txt_msg.message)
# Decrypt file
decrypted_f_t_e = prv_key.decrypt(encrypted_f_t_e)
print('decrypted_f_t_e.is_encrypted')
print(decrypted_f_t_e.is_encrypted)