Stitched aes-128 and hmac-sha1 (encrypt-then-mac)

[pablo platt]

Hi,

Stitching aes-cbc with sha1 can result with x2 performance [1].
Is there support for stitched aes-128-hmac-sha1 encrypt-then-mac? This
issue [2] says that only mac-then-encrypt is supported in OpenSSL.

Does this implement mac-then-encrypt and relevant [3]?
Is it possible to use the same code with just changing the order to achieve
encrypt-then-mac?
How can I compile the Perl file to be used from a C program?

[1] https://software.intel.com/en-us/articles/improving-openssl-performance
[2] https://github.com/openssl/openssl/issues/8785
[3]
https://github.com/openssl/openssl/blob/master/crypto/aes/asm/aesni-sha1-x86_64.pl

Thanks
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