forked from sarchar/Bitmsg
/
common.py
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common.py
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import addressgen
import ctypes
import struct
VERSION = 3
SPECIAL_SATOSHI = 1
MINIMUM_SACRIFICE = 50000
SACRIFICE_PER_KB = 15000
PIECE_SIZE = { 1: 20, 2: 119, 3: 119 }
ENCRYPT_NONE = 0
ENCRYPT_RC4 = 1
ENCRYPT_AES128 = 3
ENCRYPT_AES256 = 4
ENCRYPT_RSA = 5
RSA_PKCS1_OAEP_PADDING = 4
class RSA:
def __init__(self, rsa):
self.rsa = rsa
def __del__(self):
addressgen.ssl_library.RSA_free(self.rsa)
def size(self):
return addressgen.ssl_library.RSA_size(self.rsa)
def der(self):
bufp = ctypes.c_char_p()
sz = addressgen.ssl_library.i2d_RSAPrivateKey(self.rsa, ctypes.byref(bufp))
return bytes(ctypes.cast(bufp, ctypes.POINTER(ctypes.c_ubyte))[:sz])
def get_random_bytes(b):
buf = ctypes.create_string_buffer(b)
ret = addressgen.ssl_library.RAND_bytes(buf, b)
if ret != 1:
raise Exception('RNG is bad')
return buf.raw
def load_public_key(pem):
pem = pem.encode('ascii')
buf = ctypes.c_char_p(pem)
bufio = addressgen.ssl_library.BIO_new_mem_buf(buf, len(pem))
rsa = addressgen.ssl_library.PEM_read_bio_RSA_PUBKEY(bufio, None, 0, None)
if rsa == 0:
return None
addressgen.ssl_library.BIO_free(bufio)
return RSA(rsa)
def load_private_key(pem):
pem = pem.encode('ascii')
buf = ctypes.c_char_p(pem)
bufio = addressgen.ssl_library.BIO_new_mem_buf(buf, len(pem))
rsa = addressgen.ssl_library.PEM_read_bio_RSAPrivateKey(bufio, None, 0, None)
if rsa == 0:
return None
addressgen.ssl_library.BIO_free(bufio)
return RSA(rsa)
def load_private_key_from_der(der):
sz = len(der)
der = ctypes.c_char_p(der)
rsa = addressgen.ssl_library.d2i_RSAPrivateKey(None, ctypes.byref(der), sz)
if rsa == 0:
return None
return RSA(rsa)
def encrypt(key, message, algorithm, iv=None):
if algorithm == ENCRYPT_NONE:
return message
elif algorithm == ENCRYPT_RC4: # RC4, symmetric key
ctx = ctypes.create_string_buffer(140)
addressgen.ssl_library.EVP_CIPHER_CTX_init(ctx)
cipher = addressgen.ssl_library.EVP_rc4()
key_length = len(key)
# configure parameters
r = addressgen.ssl_library.EVP_EncryptInit_ex(ctx, cipher, None, None, None)
if r == 0:
raise Exception("EncryptInit failed")
addressgen.ssl_library.EVP_CIPHER_CTX_set_key_length(ctx, key_length)
iv = ctypes.create_string_buffer(b'\x00' * 16);
r = addressgen.ssl_library.EVP_EncryptInit_ex(ctx, None, None, ctypes.c_char_p(key), iv)
if r == 0:
raise Exception("EncryptInit failed")
addressgen.ssl_library.EVP_CIPHER_CTX_set_padding(ctx, 1)
block_size = addressgen.ssl_library.EVP_CIPHER_block_size(cipher)
outlen = ctypes.c_int(len(message) + block_size)
out = ctypes.create_string_buffer(outlen.value)
r = addressgen.ssl_library.EVP_EncryptUpdate(ctx, out, ctypes.byref(outlen), ctypes.c_char_p(message), len(message))
if r == 0:
raise Exception("EncryptUpdate failed")
outlen2 = ctypes.c_int(block_size)
out2 = ctypes.create_string_buffer(outlen2.value)
r = addressgen.ssl_library.EVP_EncryptFinal_ex(ctx, out2, ctypes.byref(outlen2))
if r == 0:
raise Exception("EncryptFinal failed")
ret = out[:outlen.value] + out2[:outlen2.value]
addressgen.ssl_library.EVP_CIPHER_CTX_cleanup(ctx)
return ret
elif algorithm == ENCRYPT_AES128 or algorithm == ENCRYPT_AES256:
ctx = ctypes.create_string_buffer(140)
addressgen.ssl_library.EVP_CIPHER_CTX_init(ctx)
key_length = len(key)
if algorithm == ENCRYPT_AES128:
cipher = addressgen.ssl_library.EVP_aes_128_cbc()
assert key_length == 16
else:
cipher = addressgen.ssl_library.EVP_aes_256_cbc()
assert key_length == 32
# configure parameters
r = addressgen.ssl_library.EVP_EncryptInit_ex(ctx, cipher, None, None, None)
if r == 0:
raise Exception("EncryptInit failed")
addressgen.ssl_library.EVP_CIPHER_CTX_set_key_length(ctx, key_length)
assert iv is not None and len(iv) == key_length
iv = ctypes.create_string_buffer(iv)
r = addressgen.ssl_library.EVP_EncryptInit_ex(ctx, None, None, ctypes.c_char_p(key), iv)
if r == 0:
raise Exception("EncryptInit failed")
addressgen.ssl_library.EVP_CIPHER_CTX_set_padding(ctx, 1)
block_size = addressgen.ssl_library.EVP_CIPHER_block_size(cipher)
outlen = ctypes.c_int(len(message) + block_size)
out = ctypes.create_string_buffer(outlen.value)
r = addressgen.ssl_library.EVP_EncryptUpdate(ctx, out, ctypes.byref(outlen), ctypes.c_char_p(message), len(message))
if r == 0:
raise Exception("EncryptUpdate failed")
outlen2 = ctypes.c_int(block_size)
out2 = ctypes.create_string_buffer(outlen2.value)
r = addressgen.ssl_library.EVP_EncryptFinal_ex(ctx, out2, ctypes.byref(outlen2))
if r == 0:
raise Exception("EncryptFinal failed")
ret = out[:outlen.value] + out2[:outlen2.value]
addressgen.ssl_library.EVP_CIPHER_CTX_cleanup(ctx)
return ret
elif algorithm == ENCRYPT_RSA:
rsa_size = addressgen.ssl_library.RSA_size(key.rsa)
buf = ctypes.create_string_buffer(rsa_size)
# flen must be ... less than RSA_size(rsa) - 41 for RSA_PKCS1_OAEP_PADDING
if len(message) > (rsa_size - 41):
raise Exception("RSA can only encrypt messages less than the key size")
encrypt_len = addressgen.ssl_library.RSA_public_encrypt(len(message), ctypes.c_char_p(message), buf, key.rsa, RSA_PKCS1_OAEP_PADDING)
if encrypt_len == -1:
raise Exception("RSA encryption failed")
return buf.raw
else:
# TODO - someone please implement me!
raise Exception("unknown encryption algorithm {}".format(algorithm))
def decrypt(key, message, algorithm, iv=None):
if algorithm == ENCRYPT_NONE:
return message
elif algorithm == ENCRYPT_RC4:
ctx = ctypes.create_unicode_buffer(140)
addressgen.ssl_library.EVP_CIPHER_CTX_init(ctx)
key_length = len(key)
cipher = addressgen.ssl_library.EVP_rc4()
# First configure parameters
r = addressgen.ssl_library.EVP_DecryptInit_ex(ctx, cipher, None, None, None)
if r == 0:
raise Exception("EncryptInit failed")
addressgen.ssl_library.EVP_CIPHER_CTX_set_key_length(ctx, key_length)
# Then reinit..
iv = ctypes.create_string_buffer(b'\x00' * 16);
r = addressgen.ssl_library.EVP_DecryptInit_ex(ctx, None, None, ctypes.c_char_p(key), iv)
if r == 0:
raise Exception("DecryptInit failed")
addressgen.ssl_library.EVP_CIPHER_CTX_set_padding(ctx, 1)
block_size = addressgen.ssl_library.EVP_CIPHER_block_size(cipher)
outlen = ctypes.c_int(len(message) + block_size)
out = ctypes.create_string_buffer(b'\x00' * outlen.value)
r = addressgen.ssl_library.EVP_DecryptUpdate(ctx, out, ctypes.byref(outlen), ctypes.c_char_p(message), len(message))
if r == 0:
raise Exception("DecryptUpdate failed")
out2 = ctypes.create_string_buffer(b'\x00' * block_size)
outlen2 = ctypes.c_int(block_size)
r = addressgen.ssl_library.EVP_DecryptFinal_ex(ctx, out2, ctypes.byref(outlen2))
addressgen.ssl_library.EVP_CIPHER_CTX_cleanup(ctx)
return out[:outlen.value] + out2[:outlen2.value]
elif algorithm == ENCRYPT_AES128 or algorithm == ENCRYPT_AES256:
ctx = ctypes.create_unicode_buffer(140)
addressgen.ssl_library.EVP_CIPHER_CTX_init(ctx)
key_length = len(key)
if algorithm == ENCRYPT_AES128:
cipher = addressgen.ssl_library.EVP_aes_128_cbc()
assert key_length == 16
else:
cipher = addressgen.ssl_library.EVP_aes_256_cbc()
assert key_length == 32
# First configure parameters
r = addressgen.ssl_library.EVP_DecryptInit_ex(ctx, cipher, None, None, None)
if r == 0:
raise Exception("EncryptInit failed")
addressgen.ssl_library.EVP_CIPHER_CTX_set_key_length(ctx, key_length)
# Then reinit..
assert iv is not None and len(iv) == key_length
iv = ctypes.create_string_buffer(iv)
r = addressgen.ssl_library.EVP_DecryptInit_ex(ctx, None, None, ctypes.c_char_p(key), iv)
if r == 0:
raise Exception("DecryptInit failed")
addressgen.ssl_library.EVP_CIPHER_CTX_set_padding(ctx, 1)
block_size = addressgen.ssl_library.EVP_CIPHER_block_size(cipher)
outlen = ctypes.c_int(len(message) + block_size)
out = ctypes.create_string_buffer(b'\x00' * outlen.value)
r = addressgen.ssl_library.EVP_DecryptUpdate(ctx, out, ctypes.byref(outlen), ctypes.c_char_p(message), len(message))
if r == 0:
raise Exception("DecryptUpdate failed")
out2 = ctypes.create_string_buffer(b'\x00' * block_size)
outlen2 = ctypes.c_int(block_size)
r = addressgen.ssl_library.EVP_DecryptFinal_ex(ctx, out2, ctypes.byref(outlen2))
addressgen.ssl_library.EVP_CIPHER_CTX_cleanup(ctx)
return out[:outlen.value] + out2[:outlen2.value]
elif algorithm == ENCRYPT_RSA:
rsa_size = addressgen.ssl_library.RSA_size(key.rsa)
buf = ctypes.create_string_buffer(rsa_size)
## flen must be ... less than RSA_size(rsa) - 41 for RSA_PKCS1_OAEP_PADDING
#if len(message) > (rsa_size - 41):
# raise Exception("RSA can only encrypt messages less than the key size")
decrypt_len = addressgen.ssl_library.RSA_private_decrypt(len(message), ctypes.c_char_p(message), buf, key.rsa, RSA_PKCS1_OAEP_PADDING)
if decrypt_len == -1:
raise Exception("RSA encryption failed")
return buf[:decrypt_len]