Unit test in pyopenssl fails as well:

pkey = <OpenSSL.crypto.PKey object at 0x7f572536b940>
data = b'It was a bright cold day in April, and the clocks were striking 
thirteen. Winston Smith, his chin nuzzled into his b...s doors of Victory 
Mansions, though not quickly enough to prevent a swirl of gritty dust from 
entering along with him.'
digest = 'sha1'

    def sign(pkey, data, digest):
        """
        Sign data with a digest
    
        :param pkey: Pkey to sign with
        :param data: data to be signed
        :param digest: message digest to use
        :return: signature
        """
        data = _text_to_bytes_and_warn("data", data)
    
        digest_obj = _lib.EVP_get_digestbyname(_byte_string(digest))
        if digest_obj == _ffi.NULL:
            raise ValueError("No such digest method")
    
>       md_ctx = _ffi.new("EVP_MD_CTX*")
E       TypeError: cannot instantiate ctype 'EVP_MD_CTX' of unknown size

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https://bugs.launchpad.net/bugs/1618765

Title:
  TypeError: cannot instantiate ctype 'EVP_MD_CTX' of unknown size

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