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POUnable to decrypt stored encrypted data
 

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    <p>I'm running into issues with data I'm trying to store encrypted in my Rails 4 app. I've been looking at lots of questions related to this and there are many hints, feels like I'm almost there, but somehow it just won't decrypt the data. These are the two methods involved:</p> <pre><code>def encrypt( val, pwd_name ) cipher = OpenSSL::Cipher.new 'AES-128-CBC' cipher.encrypt iv = cipher.random_iv pwd = encryptor_pwds[ pwd_name ] salt = OpenSSL::Random.random_bytes 16 iter = 20000 key_len = cipher.key_len digest = OpenSSL::Digest::SHA256.new key = OpenSSL::PKCS5.pbkdf2_hmac(pwd, salt, iter, key_len, digest) cipher.key = key encrypted = cipher.update val encrypted &lt;&lt; cipher.final encrypted = Base64.encode64( encrypted ).encode('utf-8') iv = Base64.encode64( iv ).encode('utf-8') salt = Base64.encode64( salt ).encode('utf-8') return { str: encrypted, iv: iv, salt: salt } end def decrypt( str, iv, salt, pwd_name ) cipher = OpenSSL::Cipher.new 'AES-128-CBC' cipher.decrypt str = Base64.decode64( str ) iv = Base64.decode64( iv ) salt = Base64.decode64( salt ) cipher.iv = iv pwd = encryptor_pwds[ pwd_name ] salt = salt iter = 20000 key_len = cipher.key_len digest = OpenSSL::Digest::SHA256.new key = OpenSSL::PKCS5.pbkdf2_hmac(pwd, salt, iter, key_len, digest) cipher.key = key decrypted = cipher.update str decrypted &lt;&lt; cipher.final return decrypted end </code></pre> <p>And the I modified the read/writes to for example this:</p> <pre><code>def email=(email) unless email.nil? set = encrypt(email, :email) write_attribute( :email, set[:str] ) write_attribute( :email_iv, set[:iv] ) write_attribute( :email_salt, set[:salt] ) else write_attribute( :email, nil ) end end def email if read_attribute( :email ).nil? then read_attribute( :email ) else decrypt( read_attribute( :email ), read_attribute( :email_iv ), read_attribute( :email_salt ), :email ) end end </code></pre> <p>But when I try to read from it, it throws this <code>OpenSSL::Cipher::CipherError: bad decrypt</code> that more people seem to run into.</p> <p>Any help would be much appreciated!</p>
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    1. USJasper Kennis
    1. USJasper Kennis
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    1. CO"*that more people seem to run into*" > So, what happened when you tried the solutions suggested by other threads/forums?
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      1. USDuncan Jones
    2. COCould you use these functions with test key/data and print the input/output in hexadecimals here? Print out the password, salt, IV and derived key. It's paramount that you print these values right before encryption/decryption. Note that `bad decrypt` could mean anything. Wrong key, wrong data, wrong encoding, wrong salt, wrong passwrod and possibly even wrong IV.
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      1. USMaarten Bodewes
    3. COAre you sure the encodings are correct?
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      1. USimichaelmiers
 

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