java.security.NoSuchAlgorithmException:Cannot find any provider supporting AES/ECB/PKCS7PADDING

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You don’t want to specify PKCS#7 padding for block cipher use. You want to specify PKCS#5 padding. PKCS#5 is specified for use with block ciphers while PKCS#7 is not (it’s use for different places like in S/MIME). I will point out that PKCS#5 and PKCS#7 actually specify exactly the same type of padding (they are the same!), but it’s called #5 when used in this context. 🙂

So, instead of "AES/ECB/PKCS7PADDING", you want "AES/ECB/PKCS5PADDING". This is a cipher implementation that every implementation of the Java platform is required to support. See the documentation of the Cipher class for more details.

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