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add "chacha20-ietf", libsodium version must be higher than 1.0.4, see https://github.com/jedisct1/libsodium/releases/

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This commit is contained in:
BreakWa11 2015-12-22 11:18:27 +08:00
parent 202f0f6142
commit 3dec2377bb
1 changed files with 17 additions and 0 deletions
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17
shadowsocks/crypto/sodium.py
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@ -52,6 +52,12 @@ def load_libsodium():
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_ulonglong,
c_char_p)
buf = create_string_buffer(buf_size)
loaded = True
@ -68,6 +74,8 @@ 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 +105,7 @@ class SodiumCrypto(object):
ciphers = {
'salsa20': (32, 8, SodiumCrypto),
'chacha20': (32, 8, SodiumCrypto),
'chacha20-ietf': (32, 12, SodiumCrypto),
}
@ -115,6 +124,14 @@ 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()