Using Oracle STANDARD_HASH, reproduce the hash in JAVA -


i'm using standard_hash('input','sha256') function within oracle populate records relative hash values.

this can reproduced connecting oracle doing:

select standard_hash('1234','sha256')  dual 
table x     column 1, column 1-hashed     1234, sha512hashresult     1234, sha512hashresult     1234, sha512hashresult     1234, sha512hashresult

now whats question; have in java in order reproduce hash values produced standard_hash in oracle? have experience this?

note; reason there no seed on recommended oracle hash function. know default seed or how figure out?

background: want do? populate table within oracle oracle-default-tools , use java program receive input, hash , select correct record in table.

what don't want; people tell me how can achieve in different way, need way otherwise save time

you can standard libraries. use java.security.messagedigest algorithm sha-256:

import java.nio.charset.standardcharsets; import java.security.messagedigest; import javax.xml.bind.datatypeconverter; ...  string input = "1234";         byte[] hashbytes = messagedigest.getinstance("sha-256")         .digest(input.getbytes(standardcharsets.utf_8)); string hash = datatypeconverter.printhexbinary(hashbytes); system.out.println(hash);

this prints 03ac674216f3e15c761ee1a5e255f067953623c8b388b4459e13f978d7c846f4, same string standard_hash return.

as discussed in how convert byte array hex string in java?, there faster ways convert byte[] hex string, datatypeconverter.printhexbinary() has benefit of being part of standard library, , should fine use cases.


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