python 不支持 RSA 密钥格式

Question

我想用我拥有的 public 密钥加密纯文本。为此，我使用 pycryptodome 模块编写了如下代码。

from Cryptodome.Cipher import PKCS1_v1_5
from Cryptodome.PublicKey import RSA
from base64 import b64decode,b64encode

key = '30820122300d06092a864886f70d01010105000382010f003082010a0282010100f357429c22add0d547ee3e4e876f921a0114d1aaa2e6eeac6177a6a2e2565ce9593b78ea0ec1d8335a9f12356f08e99ea0c3455d849774d85f954ee68d63fc8d6526918210f28dc51aa333b0c4cdc6bf9b029d1c50b5aef5e626c9c8c9c16231c41eef530be91143627205bbbf99c2c261791d2df71e69fbc83cdc7e37c1b3df4ae71244a691c6d2a73eab7617c713e9c193484459f45adc6dd0cba1d54f1abef5b2c34dee43fc0c067ce1c140bc4f81b935c94b116cce404c5b438a0395906ff0133f5b1c6e3b2bb423c6c350376eb4939f44461164195acc51ef44a34d4100f6a837e3473e3ce2e16cedbe67ca48da301f64fc4240b878c9cc6b3d30c316b50203010001\n\'

plain = 'lee'
keyPub = RSA.importKey(key)
cipher = PKCS1_v1_5.new(RSA.import_key(keyPub))
print(cipher.encrypt(plain))

但是keyPub = RSA.importKey(key)出现如下错误

RSA key format is not supported

如何解决以下错误？

Answer 1

这是一个 X.509/SPKI 格式的 RSA public 密钥，编码为十六进制字符串，可以在线验证，例如在 https://lapo.it/asn1js/。但是，最后的\n\必须去掉。
importKey expects binary (or PEM encoded) data for this fromat, i.e. the key must be hex decoded. The imported key can be used directly when instantiating the PKCS1_v1_5 对象（即不需要使用 import_key 的第二次调用）。

以下代码有效：

from Cryptodome.Cipher import PKCS1_v1_5
from Cryptodome.PublicKey import RSA

key = '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'

plain = b'lee'
keyPub = RSA.import_key(bytes.fromhex(key))
cipher = PKCS1_v1_5.new(keyPub)
print(cipher.encrypt(plain).hex())

python 不支持 RSA 密钥格式

RSA key format is not supported in python

python

cryptography

rsa