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crypto/aes: NewCipher only accept 16 bytes aes key? #9559

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haoxins opened this issue Jan 10, 2015 · 1 comment
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crypto/aes: NewCipher only accept 16 bytes aes key? #9559

haoxins opened this issue Jan 10, 2015 · 1 comment
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@haoxins
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haoxins commented Jan 10, 2015

use go version - 1.4

According to the doc

  • NewCipher creates and returns a new cipher.Block. The key argument should be the AES key, either 16, 24, or 32 bytes ...

but in the NewCFBEncrypter and NewCBCEncrypter, just compare the length of iv with block.BlockSize(), the return is a const 16.

Because of the iv must be the same length as the Block's block size, the AES key must be 16 bytes?
@minux
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minux commented Jan 10, 2015

You've confused key and IV, they are not the same thing.
key can be 16/24/32 bytes for AES, but IV must be 16-byte to match the
block size.

http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher-block_chaining_.28CBC.29

Working as intended.

@minux minux closed this as completed Jan 10, 2015
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