algorithm - How do I implement CBC mode? -


my problem lies around aes encryption algorithm , implementing iv algorithm. have ecb version of aes working , have thoroughly tested it. i'm trying make more secure adding in iv. looking understand better knowing how iv implemented in algorithm.

i understanding iv xor'd plain text before encryption, , iv stored encrypted data decryption. when go decrypt, do same xor computation after decryption process?

i tried above process , test encryption , decryption work same values, when put 2 processes side side values close 1 another, doesn't seem working quite right. not asking code fixed, process laid out me know i'm doing correctly. thanks.

i find wikipedia diagrams useful visualizing happens in cbc-mode:

wiki diagram

you need decrypt first block of ciphertext, xor iv first block of plaintext. thereafter, need xor previous block of ciphertext current block of decrypted data.


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