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Here are the ciphersuite preference parameters being used in
ustream-ssl with openssl/wolfssl (and with mbedtls, minus the
chacha-poly cipher):

 - key exchange: prefer ECDHE, then DHE(client only), then RSA
 - prefer AEAD ciphers:
      chacha20-poly1305, the fastest in software, 256-bits
      aes128-gcm, 128-bits
      aes256-gcm, 256-bits
 - CBC ciphers
      aes128, aes256, 3DES(client only)

Now that mbedtls added support to chacha-poly, we can finally make them
all the same.  As for the speed comparison between the AEAD ciphers,
here are the numbers using openssl 1.1.0 on Asus RT-N56U (mips74kc).

((openssl speed -evp chacha20-poly1305 | egrep "^(type|chacha)") && (openssl 
speed -evp aes-128-gcm && openssl speed -evp aes-256-gcm) | egrep "^aes") 
2>/dev/null
type              16 bytes   64 bytes  256 bytes  1024 bytes 8192 bytes  16384 
bytes
chacha20-poly1305  6873.30k  10734.22k  12217.75k   12613.07k  12769.39k    
12665.00k
aes-128-gcm        3759.88k   4280.96k   4415.66k    4437.79k   4456.12k     
4436.88k
aes-256-gcm        3408.83k   3738.10k   3838.52k    3841.90k   3864.31k     
3882.17k

chach20-poly1305 is almost 3 times faster than AES128, with twice the
strength.

Eneas U de Queiroz (1):
  ustream-ssl: mbedtls: use chacha-poly ciphersuites

 ustream-mbedtls.c | 5 +++++
 1 file changed, 5 insertions(+)

-- 
2.16.4



--- End Message ---
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