Example #1
0
 def raw_encrypt(data, pubkey_x, pubkey_y, curve='sect283r1', ephemcurve=None, ciphername='aes-256-cbc'):
     if ephemcurve == None: ephemcurve = curve
     ephem = ecc(curve=ephemcurve)
     key = ephem.raw_get_ecdh_key(pubkey_x, pubkey_y)
     pubkey = ephem.get_pubkey()
     iv = openssl.rand(openssl.get_cipher(ciphername).get_blocksize())
     ctx = cipher(key, iv, 1, ciphername)
     return iv + pubkey + ctx.ciphering(data)
Example #2
0
 def decrypt(self, data, ciphername='aes-256-cbc'):
     """
     Decrypt data with ECIES method using the local private key
     """
     blocksize = openssl.get_cipher(ciphername).get_blocksize()
     iv = data[:blocksize]
     i = blocksize
     curve, pubkey_x, pubkey_y, i2 = ecc._decode_pubkey(data[i:])
     i += i2
     data = data[i:]
     key = self.raw_get_ecdh_key(pubkey_x, pubkey_y)
     ctx = cipher(key, iv, 0, ciphername)
     return ctx.ciphering(data)
Example #3
0
 def __init__(self, key, iv, do, ciphername='aes-256-cbc'):
     """
     do == 1 => Encrypt; do == 0 => Decrypt
     """
     self.cipher = openssl.get_cipher(ciphername)
     self.ctx = openssl.EVP_CIPHER_CTX_new()
     self.ciphertext = b""
     self.size = 0
     if do == 1 or do == 0:
         k = openssl.malloc(key, len(key))
         IV = openssl.malloc(iv, len(iv))
         openssl.EVP_CipherInit_ex(self.ctx, self.cipher.get_pointer(), 0, k, IV, do)
     else:
         raise Exception("RTFM ...")
Example #4
0
 def gen_IV(ciphername):
     cipher = openssl.get_cipher(ciphername)
     return openssl.rand(cipher.get_blocksize())
Example #5
0
 def get_blocksize(ciphername):
     cipher = openssl.get_cipher(ciphername)
     return cipher.get_blocksize()