PHP中的HMAC md5加密/解密[重复]

Question

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• encrypt and decrypt md5 6 answers

I have the php code for making HMAC md5 encryption

$input = 'foo';
$output = hash_hmac('md5', $input, $secretKey);

After making the hash,is there anyway I could get the $input back to text form.

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Answer 1

The difference between encryption (which MD5 is not) and hashing is that hashing is unidirectional. The answer is no.