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from Crypto.Util.asn1 import DerSequence |
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from ssl import PEM_cert_to_DER_cert |
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from ssl import DER_cert_to_PEM_cert |
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import base64 |
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import hashlib |
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from Crypto.Signature import PKCS1_v1_5 |
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from Crypto.Hash import SHA256 |
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from Crypto.Hash import SHA |
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from Crypto.PublicKey import RSA |
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from Crypto.Cipher import AES |
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from Crypto.Cipher import PKCS1_OAEP |
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from Crypto import Hash |
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from Crypto import Random |
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BS = 16 |
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pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS) |
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unpad = lambda s: s[:-ord(s[len(s) - 1:])] |
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def dem_to_der(data): |
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""" |
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ssh.PEM_cert_to_DER_cert seems to have issues with python3 bytes, so we wrap it |
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""" |
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data = PEM_cert_to_DER_cert(data.decode("utf8")) |
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return data |
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def encrypt_aes(key, raw): |
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#key = hashlib.sha256(key.encode()).digest() |
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key = key.exportKey(format="DER") |
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raw = pad(raw) |
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iv = Random.new().read(AES.block_size) |
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cipher = AES.new(key, AES.MODE_CBC, iv) |
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return base64.b64encode(iv + cipher.encrypt(raw)) |
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def decrypt_aes(key, enc): |
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enc = base64.b64decode(enc) |
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iv = enc[:16] |
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cipher = AES.new(key, AES.MODE_CBC, iv) |
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return unpad(cipher.decrypt(enc[16:])) |
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def encrypt_rsa_oaep(privkey, data): |
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if not type(privkey) is RSA._RSAobj: |
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privkey = RSA.importKey(privkey) |
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cipher = PKCS1_OAEP.new(privkey, Hash.SHA256) |
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#cipher = PKCS1_OAEP.new(privkey, Hash.SHA) |
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ciphertext = cipher.encrypt(data) |
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return ciphertext |
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def pubkey_from_dercert(der): |
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cert = DerSequence() |
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cert.decode(der) |
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tbsCertificate = DerSequence() |
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tbsCertificate.decode(cert[0]) |
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subjectPublicKeyInfo = tbsCertificate[6] |
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# Initialize RSA key |
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rsa_key = RSA.importKey(subjectPublicKeyInfo) |
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return rsa_key |
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def sign_sha256(key, data): |
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if not type(key) is RSA._RSAobj: |
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key = RSA.importKey(key) |
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myhash = SHA256.new(data).digest() |
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signature = key.sign(myhash, '') |
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return signature |
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74
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def sign_sha1(key, data): |
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if not type(key) is RSA._RSAobj: |
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key = RSA.importKey(key) |
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myhash = SHA.new(data) |
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signer = PKCS1_v1_5.new(key) |
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signature = signer.sign(myhash) |
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return signature |
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85
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86
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if __name__ == "__main__": |
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import OpenSSL |
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# Convert from PEM to DER |
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pem = open("../examples/server_cert.pem").read() |
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der = PEM_cert_to_DER_cert(pem) |
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rsa_pubkey = pubkey_from_dercert(der) |
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priv_pem = open("../examples/mykey.pem").read() |
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rsa_privkey = RSA.importKey(priv_pem) |
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#lines = pem.replace(" ",'').split() |
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#der = a2b_base64(''.join(lines[1:-1])) |
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cert = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, pem) |
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97
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98
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99
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# Extract subjectPublicKeyInfo field from X.509 certificate (see RFC3280) |
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100
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#cert = DerSequence() |
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#cert.decode(der) |
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#tbsCertificate = DerSequence() |
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#tbsCertificate.decode(cert[0]) |
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#subjectPublicKeyInfo = tbsCertificate[6] |
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105
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106
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# Initialize RSA key |
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#rsa_key = RSA.importKey(subjectPublicKeyInfo) |
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print("Pub Key", rsa_pubkey) |
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print("Priv Key", rsa_privkey) |
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msg = encrypt256(rsa_privkey, b"this is my message") |
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print("Encrypted data: ", msg) |
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112
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from IPython import embed |
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113
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embed() |
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114
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FreeOpcUa /
python-opcua
