这两个代码提供相同的签名,这是预期的:
代码1:
from M2Crypto import RSA, EVP
import base64, hashlib
text = "some text"
pkey = EVP.load_key("mykey.pem") #"mykey.pem" was generated as: openssl genrsa -des3 -out mykey.pem 2048
pkey.sign_init()
pkey.sign_update(text)
signature = pkey.sign_final()
print base64.b64encode(signature)
代码2:
pkey = RSA.load_key("mykey.pem")
signature = pkey.sign(hashlib.sha1(text).digest())
print base64.b64encode(signature)
但是,如果我想“模仿”签名算法,即用私钥加密摘要,我会得到不同的签名,即:
pkey = RSA.load_key("mykey.pem")
signature = pkey.private_encrypt(hashlib.sha1(text).digest(), RSA.pkcs1_padding)
print base64.b64encode(signature) #different from the two above
您能解释一下吗?后一种签名方式有什么问题?
最佳答案
我认为不同之处在于 RSA_sign
对摘要 PKCS1 algorithmIdentifier 和摘要数据进行签名,而 RSA_private_encrypt
仅对摘要数据进行签名。
来自 RSA_private_encrypt 手册页:
RSA_PKCS1_PADDING
PKCS #1 v1.5 padding. This function does not handle the
algorithmIdentifier specified in PKCS #1. When generating or
verifying PKCS #1 signatures, RSA_sign(3) and RSA_verify(3) should
be used.
关于python - M2crypto 签名 "algorithm",我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5663084/