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crypto/cipher: can't reuse BlockMode by NewCBCDecrypter() #11159

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Terry-Mao opened this issue Jun 11, 2015 · 7 comments
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crypto/cipher: can't reuse BlockMode by NewCBCDecrypter() #11159

Terry-Mao opened this issue Jun 11, 2015 · 7 comments
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@Terry-Mao
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code:
http://play.golang.org/p/oZ5OwdRYLV

After cbcDecrypter.CryptBlocks, the x.iv is changed. so reuse BlockMode got a wrong decrypt text.
i saw the source code has a exported method : SetIV, but cbcEncrypter is not exported.

this means everytime i must new a cbcDecrypter object.
@alphaqiu
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http://play.golang.org/p/ORTgk0mY4j

@Terry-Mao
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@alphaqiu thks, this can fix the issue, but as a std library, this seems not so nice..

@bradfitz
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Is there a documentation problem?

@Terry-Mao
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@bradfitz
document don't tell us cbc blockmode must rest(SetIV), after CryptBlocks

@minux
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minux commented Jun 11, 2015 via email

@minux
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minux commented Jun 11, 2015 via email

@Terry-Mao
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@minux thks, fixed

@mikioh mikioh changed the title crypto/cipher can't reuse BlockMode by NewCBCDecrypter() crypto/cipher: can't reuse BlockMode by NewCBCDecrypter() Jun 11, 2015
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@bradfitz @minux @alphaqiu @Terry-Mao @gopherbot