libsodium 1.0.4 发布加密库

libsodium 1.0.4 发布，此版本更新内容如下：

Support for AES256-GCM has been added. This requires a CPU with the aesni and pclmul extensions, and is accessible via the crypto_aead_aes256gcm_*() functions.
The Javascript target doesn’t use eval() any more, so that the library can be used in Chrome packaged applications.
QNX and CloudABI are now supported.
Support for NaCl has finally been added.
ChaCha20 with an extended (96 bit) nonce and a 32-bit counter has been implemented ascrypto_stream_chacha20_ietf(), crypto_stream_chacha20_ietf_xor() andcrypto_stream_chacha20_ietf_xor_ic(). An IETF-compatible version of ChaCha20Poly1305 is available as crypto_aead_chacha20poly1305_ietf_npubbytes(),crypto_aead_chacha20poly1305_ietf_encrypt() andcrypto_aead_chacha20poly1305_ietf_decrypt().
The sodium_increment() helper function has been added, to increment an arbitrary large number (such as a nonce).
The sodium_compare() helper function has been added, to compare arbitrary large numbers (such as nonces, in order to prevent replay attacks).