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POBase64 encode: Three different outputs from different tools?
 

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  1. POBase64 encode: Three different outputs from different tools?
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    <p>I am trying to verify an OAuth signature generated in code against a "known reputable source". All my steps are verified correct except the last, wherein a 'base signature string' is HMAC-SHA1 hashed against a secret key and then base64 encoded.</p> <p>I have confirmed that my hash value is the same as expected by the algorithm. I then disconfirmed that my base64 encode was the same. Attempting to determine why my encode failed, I wanted to check the encoder I was using.</p> <p>Here is the (hash) string being base64 encoded:</p> <blockquote> <p>203ebb13a65cccaae5cb1b9d5af51fe41f534357</p> </blockquote> <p>Here is the base64 encode that results in my code:</p> <blockquote> <p>MjAzZWJiMTNhNjVjY2NhYWU1Y2IxYjlkNWFmNTFmZTQxZjUzNDM1Nw==</p> </blockquote> <p>According to <a href="http://www.motobit.com/util/base64-decoder-encoder.asp" rel="nofollow noreferrer">http://www.motobit.com/util/base64-decoder-encoder.asp</a>, that is the correct result:</p> <blockquote> <p><img src="https://i.imgur.com/upYI2.png" alt="Base64 1"></p> </blockquote> <p>But, according to <a href="http://www.online-convert.com/result/096d7b00138f3726daee5f6ddb107a62" rel="nofollow noreferrer">http://www.online-convert.com/result/096d7b00138f3726daee5f6ddb107a62</a> (provided with the secret and base string, not the hash), a different base64 should have been output. Note that the hash output is my correct hash despite the difference in base64:</p> <blockquote> <p><img src="https://i.imgur.com/yZfjZ.png" alt="Base64 1"></p> </blockquote> <p>Finally, the "official" tester (<a href="http://hueniverse.com/oauth/guide/authentication/" rel="nofollow noreferrer">http://hueniverse.com/oauth/guide/authentication/</a>) outputs a <em>third</em> different base64 from the same hash:</p> <blockquote> <p><img src="https://i.imgur.com/zgLmC.png" alt="Base64 1"></p> </blockquote> <p>I have no idea what I'm doing wrong, and the fact that these tools are outputting different results makes me wonder if there is in fact such a thing as base64 encoding or if they are actually using different algorithms? Perhaps the fact that it's for OAuth would help you help me identify the answer.</p> <p>Thanks for any leads from the wise.</p>
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    1. COAnswer is whether the hash is interpreted as hex data values or as a string to be encoded. Each website handled that question differently and implicitely
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