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Add "chacha20-ietf" crypto

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smounives 2016-08-17 12:11:25 +08:00 • committed by GitHub
parent 8e8ee5d490
commit 43c4a31e39
1 changed files with 18 additions and 1 deletions
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19
shadowsocks/crypto/sodium.py
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@ -29,7 +29,7 @@ loaded = False
buf_size = 2048
# for salsa20 and chacha20
# for salsa20 and chacha20 and chacha20-ietf
BLOCK_SIZE = 64
@ -51,6 +51,11 @@ def load_libsodium():
c_ulonglong,
c_char_p, c_ulonglong,
c_char_p)
libsodium.crypto_stream_chacha20_ietf_xor_ic.restype = c_int
libsodium.crypto_stream_chacha20_ietf_xor_ic.argtypes = (c_void_p, c_char_p,
c_ulonglong,
c_char_p, c_ulong,
c_char_p)
buf = create_string_buffer(buf_size)
loaded = True
@ -68,6 +73,8 @@ class SodiumCrypto(object):
self.cipher = libsodium.crypto_stream_salsa20_xor_ic
elif cipher_name == 'chacha20':
self.cipher = libsodium.crypto_stream_chacha20_xor_ic
elif cipher_name == 'chacha20-ietf':
self.cipher = libsodium.crypto_stream_chacha20_ietf_xor_ic
else:
raise Exception('Unknown cipher')
# byte counter, not block counter
@ -97,6 +104,7 @@ class SodiumCrypto(object):
ciphers = {
'salsa20': (32, 8, SodiumCrypto),
'chacha20': (32, 8, SodiumCrypto),
'chacha20-ietf': (32, 12, SodiumCrypto),
}
@ -115,6 +123,15 @@ def test_chacha20():
util.run_cipher(cipher, decipher)
def test_chacha20_ietf():
cipher = SodiumCrypto('chacha20-ietf', b'k' * 32, b'i' * 16, 1)
decipher = SodiumCrypto('chacha20-ietf', b'k' * 32, b'i' * 16, 0)
util.run_cipher(cipher, decipher)
if __name__ == '__main__':
test_chacha20_ietf()
test_chacha20()
test_salsa20()