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sm4中的IV为什么不需要随机生成？ #102

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tututt opened this issue Mar 8, 2021 · 8 comments
Closed

sm4中的IV为什么不需要随机生成？ #102

tututt opened this issue Mar 8, 2021 · 8 comments

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@tututt
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tututt commented Mar 8, 2021

No description provided.

@czdsdo
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czdsdo commented Apr 26, 2021

加密解密时IV值要统一，否则会解密失败。为了使用方法由于就默认取0值了。

@tututt
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tututt commented Apr 26, 2021

那其实可以外部传入是不是，这样安全性更高

@czdsdo
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czdsdo commented Apr 26, 2021

是的，由于会多加一个传入参数，考虑到兼容性，与其他库互操作时也没要求自定义IV值，所以就暂时没把IV暴露出来。

@tututt
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tututt commented Apr 26, 2021

这块有后续的计划吗，因为iv固定的话实际和ECB模式没有差别了

@czdsdo
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czdsdo commented Apr 26, 2021

其他模式里的设置的IV值会影响到第一次分组的结果，后续分组操作会基于上次操作的结果。IV值的设置与否不会影响各种模式的操作逻辑流程。

@tututt
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tututt commented Apr 26, 2021

不好意思，是我看差了，确实有影响，后续暴露IV的计划吗？

@czdsdo
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czdsdo commented Apr 26, 2021

下个版本会暴露， 预计下个月。

@tututt
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tututt commented Apr 26, 2021

好的，感谢回答，我close了

@tututt tututt closed this as completed Apr 26, 2021
This was referenced Feb 11, 2022
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@czdsdo @tututt