yaole
63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
/*
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Package sm1 is the implementation of SM1 block cipher.
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The SM1 works as follows, There are three keys:
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- systems key SK
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- auxiliary key AK
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- key
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# Enecryption
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PT key SK
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v +---v------v----+
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R(·) <---- |rk |
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| | key expand |
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v | |
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round f(·) <---|rk |
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| +---------------+
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v
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J(·)
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v
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CT
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# Decryption
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CT key SK
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v +---v------v----+
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R⁻¹(·) <--- |rk |
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| | key expand |
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v | |
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round f(·) <---|rk |
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| +---------------+
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v
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J(·)
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v
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PT
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# R Transformation
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The input of R is 128 bits, and denotes as X0, X1, X2, X3 from left to right.
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The output of R is 128 bits, and denotes as Y0, Y1, Y2, Y3 from left to right..
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Y0 = X0 << 1
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Y1 = X1 << 9
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Y2 = X2 << 17
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Y3 = X3 << 25
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# R⁻¹ Transformation
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The R⁻¹ Transformation is the reverse of R transformation.
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Y0 = X0 >> 1
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Y1 = X1 >> 9
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Y2 = X2 >> 17
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Y3 = X3 >> 25
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*/
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package sm1
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