Some builds (depends on crypto engine support?) of OpenSSL 0.9.7x have EVP_DigestFinal function which which clears all of EVP_MD_CTX. This makes pgcrypto crash in functions which re-use one digest context several times: hmac() and crypt() with md5 algorithm.
Following patch fixes it by carring the digest info around EVP_DigestFinal and re-initializing cipher.
Applied to HEAD, REL8_0_STABLE and REL7_4_STABLE. Thanks for the patch.
Please apply this also to stable branches (8.0 / 7.4).
Should it be backpatched to 7.3 and 7.2 as well?
-Neil
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