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Android Kotlin AES Decryption returns Bad Decryption

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0

I currently have a problem with the decryption of my file. The problem is already holding me up for a few days. Every attempt ends in a BAD_DECRYPT exception. This is what the decrypt code looks like.

val factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256")
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), Constant().SALT_KEY.toByteArray(Charset.defaultCharset()), 65536, 256)
 val tmp = factory.generateSecret(spec)
 val secret = SecretKeySpec(tmp.encoded, "AES")
 val ivKeyBytes = Constant().IV_SECRET_KEY.toByteArray()
 val finalIvs = ByteArray(16)
 val len = if (ivKeyBytes.count() > 16) 16 else ivKeyBytes.count()
 System.arraycopy(ivKeyBytes, 0, finalIvs, 0, len)
 val ivps = IvParameterSpec(finalIvs)

 val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
 cipher.init(Cipher.DECRYPT_MODE, secret, ivps)
 return cipher.doFinal(fileData)

The encryption happens via a task on my server with openssl this looks like this

openssl enc -aes-256-cbc -md md5 -in PATH_TO_MY_FILE -out PATH_TO_MY_ENC_FILE -S "MYSALT_IN_HEX" -iv "MY_IV_IN_HEX" -k MY_KEY_PASS

What i make wrong? Can anyone help me?

Thanks in advance Sebastian

android encryption kotlin openssl aes

share|improve this question

asked Mar 22 at 19:50

Sebastian R.Sebastian R.

198218

add a comment | 

0

I currently have a problem with the decryption of my file. The problem is already holding me up for a few days. Every attempt ends in a BAD_DECRYPT exception. This is what the decrypt code looks like.

val factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256")
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), Constant().SALT_KEY.toByteArray(Charset.defaultCharset()), 65536, 256)
 val tmp = factory.generateSecret(spec)
 val secret = SecretKeySpec(tmp.encoded, "AES")
 val ivKeyBytes = Constant().IV_SECRET_KEY.toByteArray()
 val finalIvs = ByteArray(16)
 val len = if (ivKeyBytes.count() > 16) 16 else ivKeyBytes.count()
 System.arraycopy(ivKeyBytes, 0, finalIvs, 0, len)
 val ivps = IvParameterSpec(finalIvs)

 val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
 cipher.init(Cipher.DECRYPT_MODE, secret, ivps)
 return cipher.doFinal(fileData)

The encryption happens via a task on my server with openssl this looks like this

openssl enc -aes-256-cbc -md md5 -in PATH_TO_MY_FILE -out PATH_TO_MY_ENC_FILE -S "MYSALT_IN_HEX" -iv "MY_IV_IN_HEX" -k MY_KEY_PASS

What i make wrong? Can anyone help me?

Thanks in advance Sebastian

android encryption kotlin openssl aes

share|improve this question

asked Mar 22 at 19:50

Sebastian R.Sebastian R.

198218

add a comment | 

I currently have a problem with the decryption of my file. The problem is already holding me up for a few days. Every attempt ends in a BAD_DECRYPT exception. This is what the decrypt code looks like.

val factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256")
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), Constant().SALT_KEY.toByteArray(Charset.defaultCharset()), 65536, 256)
 val tmp = factory.generateSecret(spec)
 val secret = SecretKeySpec(tmp.encoded, "AES")
 val ivKeyBytes = Constant().IV_SECRET_KEY.toByteArray()
 val finalIvs = ByteArray(16)
 val len = if (ivKeyBytes.count() > 16) 16 else ivKeyBytes.count()
 System.arraycopy(ivKeyBytes, 0, finalIvs, 0, len)
 val ivps = IvParameterSpec(finalIvs)

 val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
 cipher.init(Cipher.DECRYPT_MODE, secret, ivps)
 return cipher.doFinal(fileData)

The encryption happens via a task on my server with openssl this looks like this

openssl enc -aes-256-cbc -md md5 -in PATH_TO_MY_FILE -out PATH_TO_MY_ENC_FILE -S "MYSALT_IN_HEX" -iv "MY_IV_IN_HEX" -k MY_KEY_PASS

What i make wrong? Can anyone help me?

Thanks in advance Sebastian

android encryption kotlin openssl aes

share|improve this question

asked Mar 22 at 19:50

Sebastian R.Sebastian R.

198218

val factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256")
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), Constant().SALT_KEY.toByteArray(Charset.defaultCharset()), 65536, 256)
 val tmp = factory.generateSecret(spec)
 val secret = SecretKeySpec(tmp.encoded, "AES")
 val ivKeyBytes = Constant().IV_SECRET_KEY.toByteArray()
 val finalIvs = ByteArray(16)
 val len = if (ivKeyBytes.count() > 16) 16 else ivKeyBytes.count()
 System.arraycopy(ivKeyBytes, 0, finalIvs, 0, len)
 val ivps = IvParameterSpec(finalIvs)

 val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
 cipher.init(Cipher.DECRYPT_MODE, secret, ivps)
 return cipher.doFinal(fileData)

openssl enc -aes-256-cbc -md md5 -in PATH_TO_MY_FILE -out PATH_TO_MY_ENC_FILE -S "MYSALT_IN_HEX" -iv "MY_IV_IN_HEX" -k MY_KEY_PASS

android encryption kotlin openssl aes

android encryption kotlin openssl aes

share|improve this question

asked Mar 22 at 19:50

Sebastian R.Sebastian R.

198218

share|improve this question

asked Mar 22 at 19:50

Sebastian R.Sebastian R.

198218

asked Mar 22 at 19:50

Sebastian R.Sebastian R.

198218

asked Mar 22 at 19:50

Sebastian R.Sebastian R.

198218

1 Answer
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active

oldest

votes

0

The algorithm for SecretKeyFactory doesn't seem right. You are using openssl without pbkdf2 flag and with md5 hash. I think the corresponding algorithm would be "PBEWITHMD5AND256BITAES-CBC-OPENSSL" from bouncy castle provider.

You also need to extract cipher text from the file - it starts with Salted__ string, followed by the salt, followed by the cipher text.

With these changes decryption works fine for me:

 Security.addProvider(BouncyCastleProvider())
 val factory = SecretKeyFactory.getInstance("PBEWITHMD5AND256BITAES-CBC-OPENSSL", "BC")
 val salt = Arrays.copyOfRange(fileData, 8, 16)
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), salt, 65536, 256)
 ...
 val ct = Arrays.copyOfRange(fileData, 16, fileData.size)
 return cipher.doFinal(ct)

share|improve this answer

edited Mar 25 at 10:38

answered Mar 23 at 11:24

yachooryachoor

7841616

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  nope i changed the SecretKeyFactory algorithm to the PBEWITHMD5AND256BITAES-CBC-OPENSSL but nothing changed it returns BAD_DECRYPT
  
  – Sebastian R.
  Mar 23 at 13:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thx for you're edit, i get no BAD_DECRYPT Error the only think what didn't work is the data are half decrypted and half normal it's a mix of both :/
  
  – Sebastian R.
  Mar 28 at 14:11
  

  
  
  
  

add a comment | 

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0

The algorithm for SecretKeyFactory doesn't seem right. You are using openssl without pbkdf2 flag and with md5 hash. I think the corresponding algorithm would be "PBEWITHMD5AND256BITAES-CBC-OPENSSL" from bouncy castle provider.

You also need to extract cipher text from the file - it starts with Salted__ string, followed by the salt, followed by the cipher text.

With these changes decryption works fine for me:

 Security.addProvider(BouncyCastleProvider())
 val factory = SecretKeyFactory.getInstance("PBEWITHMD5AND256BITAES-CBC-OPENSSL", "BC")
 val salt = Arrays.copyOfRange(fileData, 8, 16)
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), salt, 65536, 256)
 ...
 val ct = Arrays.copyOfRange(fileData, 16, fileData.size)
 return cipher.doFinal(ct)

share|improve this answer

edited Mar 25 at 10:38

answered Mar 23 at 11:24

yachooryachoor

7841616

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  nope i changed the SecretKeyFactory algorithm to the PBEWITHMD5AND256BITAES-CBC-OPENSSL but nothing changed it returns BAD_DECRYPT
  
  – Sebastian R.
  Mar 23 at 13:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thx for you're edit, i get no BAD_DECRYPT Error the only think what didn't work is the data are half decrypted and half normal it's a mix of both :/
  
  – Sebastian R.
  Mar 28 at 14:11
  

  
  
  
  

add a comment | 

0

The algorithm for SecretKeyFactory doesn't seem right. You are using openssl without pbkdf2 flag and with md5 hash. I think the corresponding algorithm would be "PBEWITHMD5AND256BITAES-CBC-OPENSSL" from bouncy castle provider.

You also need to extract cipher text from the file - it starts with Salted__ string, followed by the salt, followed by the cipher text.

With these changes decryption works fine for me:

 Security.addProvider(BouncyCastleProvider())
 val factory = SecretKeyFactory.getInstance("PBEWITHMD5AND256BITAES-CBC-OPENSSL", "BC")
 val salt = Arrays.copyOfRange(fileData, 8, 16)
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), salt, 65536, 256)
 ...
 val ct = Arrays.copyOfRange(fileData, 16, fileData.size)
 return cipher.doFinal(ct)

share|improve this answer

edited Mar 25 at 10:38

answered Mar 23 at 11:24

yachooryachoor

7841616

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  nope i changed the SecretKeyFactory algorithm to the PBEWITHMD5AND256BITAES-CBC-OPENSSL but nothing changed it returns BAD_DECRYPT
  
  – Sebastian R.
  Mar 23 at 13:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thx for you're edit, i get no BAD_DECRYPT Error the only think what didn't work is the data are half decrypted and half normal it's a mix of both :/
  
  – Sebastian R.
  Mar 28 at 14:11
  

  
  
  
  

add a comment | 

The algorithm for SecretKeyFactory doesn't seem right. You are using openssl without pbkdf2 flag and with md5 hash. I think the corresponding algorithm would be "PBEWITHMD5AND256BITAES-CBC-OPENSSL" from bouncy castle provider.

You also need to extract cipher text from the file - it starts with Salted__ string, followed by the salt, followed by the cipher text.

With these changes decryption works fine for me:

 Security.addProvider(BouncyCastleProvider())
 val factory = SecretKeyFactory.getInstance("PBEWITHMD5AND256BITAES-CBC-OPENSSL", "BC")
 val salt = Arrays.copyOfRange(fileData, 8, 16)
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), salt, 65536, 256)
 ...
 val ct = Arrays.copyOfRange(fileData, 16, fileData.size)
 return cipher.doFinal(ct)

share|improve this answer

edited Mar 25 at 10:38

answered Mar 23 at 11:24

yachooryachoor

7841616

 Security.addProvider(BouncyCastleProvider())
 val factory = SecretKeyFactory.getInstance("PBEWITHMD5AND256BITAES-CBC-OPENSSL", "BC")
 val salt = Arrays.copyOfRange(fileData, 8, 16)
 val spec = PBEKeySpec(Constant().SECRET_KEY.toCharArray(), salt, 65536, 256)
 ...
 val ct = Arrays.copyOfRange(fileData, 16, fileData.size)
 return cipher.doFinal(ct)

share|improve this answer

edited Mar 25 at 10:38

answered Mar 23 at 11:24

yachooryachoor

7841616

answered Mar 23 at 11:24

yachooryachoor

7841616

answered Mar 23 at 11:24

yachooryachoor

7841616