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Title: Double hashing question Post by: b129 on April 29, 2013, 09:49:24 PM Am trying to verify some code I have written:
I am using a sample message "hello" and run a single sha256 hash and get the correct result, but try to hash the result and don't get the same result for the 2nd hash.... I am referencing the following page: https://en.bitcoin.it/wiki/Protocol_specification My single sha256 hash is verified, and agrees with the following: http://www.xorbin.com/tools/sha256-hash-calculator Is there a step I am missing for calculating the second hash? Sha256("hello") = "2cf24dba...." Sha256("2cf24dba....") <> "9595c9d..." Title: Re: Double hashing question Post by: DannyHamilton on April 30, 2013, 01:14:47 AM Am trying to verify some code I have written: I am using a sample message "hello" and run a single sha256 hash and get the correct result, but try to hash the result and don't get the same result for the 2nd hash.... I am referencing the following page: https://en.bitcoin.it/wiki/Protocol_specification My single sha256 hash is verified, and agrees with the following: http://www.xorbin.com/tools/sha256-hash-calculator Is there a step I am missing for calculating the second hash? Sha256("hello") = "2cf24dba...." Sha256("2cf24dba....") <> "9595c9d..." I suspect you are treating the first hash as a string of alphanumeric characters instead of a block of hexcode bytes. Title: Re: Double hashing question Post by: b129 on April 30, 2013, 01:28:25 AM Good point - that should be the answer - sometimes easiest solution is right in front of you just takes someone else to notice.
Title: Re: Double hashing question Post by: b129 on April 30, 2013, 07:48:01 AM Yep worked that's all it was thanks
Title: Re: Double hashing question Post by: candelone on April 30, 2013, 07:54:14 AM very goog work
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