ALBRECHT Active Member Licensed User Aug 5, 2019 #1 Hello, I need to check , server side an AES encryption for my own api create with asp. the string in encrypted with B4XCipher and has been sent with poststring, the recept is ok but server side, i have trying to use rijndael library functions but I can not decipher correctly found there : http://www.freevbcode.com/ShowCode.asp?ID=2389 Could you have an idea or another method (in asp, php or other) to put me on the way for that ? thanks Michel Last edited: Aug 5, 2019
Hello, I need to check , server side an AES encryption for my own api create with asp. the string in encrypted with B4XCipher and has been sent with poststring, the recept is ok but server side, i have trying to use rijndael library functions but I can not decipher correctly found there : http://www.freevbcode.com/ShowCode.asp?ID=2389 Could you have an idea or another method (in asp, php or other) to put me on the way for that ? thanks Michel
techknight Well-Known Member Licensed User Longtime User Aug 5, 2019 #2 Check for endianness issues. Try byteswapping the key, or message, or both. Upvote 0
ALBRECHT Active Member Licensed User Aug 5, 2019 #3 please, do you have eventualy a link to let me analyse that decyphering methode ? Upvote 0
techknight Well-Known Member Licensed User Longtime User Aug 5, 2019 #4 ? You posted a link to VB code. its all there.... Not sure what your asking. The difference I see, is the VB code is Rijndael, which isnt "exactly" AES. See here: https://stackoverflow.com/questions/748622/differences-between-rijndael-and-aes The VB is using 32 bytes which is 256 bit. AES is 128 bit. If your using the VB code as 128 bit, and it still doesnt work, then check for the endianness. I dont have the source code of B4XCipher, so I dont know if its little endian or big endian. But the Endianness between the two systems have to be the same. Last edited: Aug 5, 2019 Upvote 0
? You posted a link to VB code. its all there.... Not sure what your asking. The difference I see, is the VB code is Rijndael, which isnt "exactly" AES. See here: https://stackoverflow.com/questions/748622/differences-between-rijndael-and-aes The VB is using 32 bytes which is 256 bit. AES is 128 bit. If your using the VB code as 128 bit, and it still doesnt work, then check for the endianness. I dont have the source code of B4XCipher, so I dont know if its little endian or big endian. But the Endianness between the two systems have to be the same.
ALBRECHT Active Member Licensed User Aug 5, 2019 #5 ok i understand, im going to go further in that way with the correct endianness and if i m able to understand how works B4XCipher ... Thanks Upvote 0
ok i understand, im going to go further in that way with the correct endianness and if i m able to understand how works B4XCipher ... Thanks
Jeffrey Cameron Well-Known Member Licensed User Longtime User Aug 5, 2019 #6 See this post, it may be helpful: https://www.b4x.com/android/forum/t...-vs-vb-net-2017-encryption.83598/#post-529673 Upvote 0
See this post, it may be helpful: https://www.b4x.com/android/forum/t...-vs-vb-net-2017-encryption.83598/#post-529673
