如何将自定义 RSA 密钥对添加到 .pem 文件

Question

我在 python 中创建了一个自定义 RSA 密钥对，仅用于测试目的。我想将私钥和 public 密钥添加到 .pem 文件，但我在研究中没有找到任何东西。我发现的只是人们从图书馆生成 RSA 密钥对。我有 public 密钥 [e, n] 和私钥 [d, n] 的 e、d 和 n 变量。

Answer 1

大多数主要的加密库都支持这一点，例如PyCryptodome（通过 construct() and exportKey()) or Cryptography (as described in the Numbers and Key Serialization 部分），例如

PyCryptodome:

from Crypto.PublicKey import RSA

n = int("b83b...529b", 16);
d = int("4eea...a721", 16);
e = int("010001", 16);

privateKey = RSA.construct((n, e, d))
privateKeyPem = privateKey.exportKey(pkcs=8) # export in PKCS#8 format

publicKey = RSA.construct((n, e))
publicKeyPem = publicKey.exportKey() # export in X.509/SPKI format

print(privateKeyPem.decode('utf8'))
print(publicKeyPem.decode('utf8'))

或密码学：

from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import serialization

n = int("b83b...529b", 16);
d = int("4eea...a721", 16);
e = int("010001", 16);

(q, p) = rsa.rsa_recover_prime_factors(n, e, d)
dmq1 = rsa.rsa_crt_dmq1(d, q)
dmp1 = rsa.rsa_crt_dmp1(d, p)
iqmp = rsa.rsa_crt_iqmp(p, q)

publicNumbers = rsa.RSAPublicNumbers(e, n)
privateNumbers = rsa.RSAPrivateNumbers(p, q, d, dmp1, dmq1, iqmp, publicNumbers)

privateKey = privateNumbers.private_key();
publicKey = publicNumbers.public_key();

privateKeyPem = privateKey.private_bytes(
   encoding=serialization.Encoding.PEM,
   format=serialization.PrivateFormat.PKCS8,
   encryption_algorithm=serialization.NoEncryption()
)

publicKeyPem = publicKey.public_bytes(
   encoding=serialization.Encoding.PEM,
   format=serialization.PublicFormat.SubjectPublicKeyInfo
)

print(privateKeyPem.decode('utf8'))
print(publicKeyPem.decode('utf8'))

请注意，原始密钥在 p 和 q 中是对称的，因此交换 p 和 q 会更改 PEM 或 DER 编码密钥，但不会更改原始密钥 (n, e, d)。

如何将自定义 RSA 密钥对添加到 .pem 文件

How to add a custom RSA key pair to a .pem file

python

encryption

cryptography

rsa