这两个代码提供了相同的签名,这是预期的:
code1:
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)
code2:
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
您能提供一些解释吗?后一种签名方式有什么问题吗?
我相信区别在于RSA_sign
将摘要 PKCS1 算法标识符与摘要数据一起签名,其中RSA_private_encrypt
仅签署摘要数据。
来自RSA_私有_加密 http://www.openssl.org/docs/crypto/RSA_private_encrypt.html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.
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