php openssl使用aes256加密数据并使用sha256散列传递帮助！

openssl only accepting half of a sha256 hashed password
$encryptedkey = openssl_encrypt ($data, 'AES256', "$sha256", $raw_output = false);
hash looks like this:a0461cea77b9942addee32b2265b32ebcf150426e2490810938ab47206fd320b
its only accepting 32 characters of it:a0461cea77b9942addee32b2265b32eb
how can i fix this? thank you!

edit: example: when decrypting the data if the hash does not mach after 32 character it will still decrypt it even if its wrong

a0461cea77b9942addee32b2265b32ebcf150426e2490810938ab47206fd320b
a0461cea77b9942addee32b2265b32ebcf150426e24808019485b43406df3a9b

both will work when they shouldn't?