apppublic/appPublic/RSAutils.py
2020-07-12 16:04:02 +08:00

89 lines
2.4 KiB
Python

import codecs
from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_OAEP
from Crypto.Cipher import KPCS1_V1_5 as V1_5
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA512, SHA384, SHA256, SHA, MD5
from Crypto import Random
from base64 import b64encode, b64decode
hash = "SHA-256"
def readPublickey(fname):
with codecs.open(fname,'r','utf8') as f:
b = f.read()
k = RSA.importKey(b)
return k
return None
def readPrivatekey(fname,pwd):
with codecs.open(fname,'r','utf8') as f:
b = f.read()
k = RSA.importKey(b,pwd)
return k
return None
def newkeys(keysize):
random_generator = Random.new().read
key = RSA.generate(keysize, random_generator)
private, public = key, key.publickey()
return public, private
def importKey(externKey):
return RSA.importKey(externKey)
def getpublickey(priv_key):
return priv_key.publickey()
def encrypt(message, pub_key):
cipher = PKCS1_OAEP.new(pub_key)
return cipher.encrypt(message)
def decrypt(ciphertext, priv_key):
try:
cipher = PKCS1_OAEP.new(priv_key)
return cipher.decrypt(ciphertext)
except Exception as e:
print('e=',e)
cipher = V1_5.new(priv_key)
return cipher.decrypt(ciphertext)
def sign(message, priv_key, hashAlg = "SHA-256"):
global hash
hash = hashAlg
signer = PKCS1_v1_5.new(priv_key)
if (hash == "SHA-512"):
digest = SHA512.new()
elif (hash == "SHA-384"):
digest = SHA384.new()
elif (hash == "SHA-256"):
digest = SHA256.new()
elif (hash == "SHA-1"):
digest = SHA.new()
else:
digest = MD5.new()
digest.update(message)
return signer.sign(digest)
def verify(message, signature, pub_key):
signer = PKCS1_v1_5.new(pub_key)
if (hash == "SHA-512"):
digest = SHA512.new()
elif (hash == "SHA-384"):
digest = SHA384.new()
elif (hash == "SHA-256"):
digest = SHA256.new()
elif (hash == "SHA-1"):
digest = SHA.new()
else:
digest = MD5.new()
digest.update(message)
return signer.verify(digest, signature)
if __name__ == '__main__':
cipher="""WaMlLEYnhBk+kTDyN/4OJmQf4ccNdk6USgtKpb7eHsYsotq4iyXi3N5hB1E/PqrPSmca1AMDLUcumwIrLeGLT9it3eTBQgl1YQAsmPxa6lF/rDOZoLbwD5sJ6ab/0/fuM4GbotqN5/d0MeuOSELoo8cFWw+7XpRxn9EMYnw5SzsjDQRWxXjZptoaGa/8pBBkDmgLqINif9EWV+8899xqTd0e9w1Gqb7wbt/elRNVBpgsSuSZb+dtBlvNUjuTms8BETSRai5vhXetK26Ms8hrayiy38n7wwEKE8fZ9iFzLtwa6xbhD5KudWbKJFFOZAfpzWttGMwWlISbGQigcW4+Bg=="""
key = readPrivatekey('d:/dev/mecp/conf/RSA.private.key','ymq123')
t = decrypt(cipher,key)
print('t=',t)