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e7f051b8f9
Split md5_crypt_verify() into three functions: * get_role_password() to fetch user's password from pg_authid, and check its expiration. * md5_crypt_verify() to check an MD5 authentication challenge * plain_crypt_verify() to check a plaintext password. get_role_password() will be needed as a separate function by the upcoming SCRAM authentication patch set. Most of the remaining functionality in md5_crypt_verify() was different for MD5 and plaintext authentication, so split that for readability. While we're at it, simplify the *_crypt_verify functions by using stack-allocated buffers to hold the temporary MD5 hashes, instead of pallocing. Reviewed by Michael Paquier. Discussion: https://www.postgresql.org/message-id/3029e460-d47c-710e-507e-d8ba759d7cbb@iki.fi