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15 lines
626 B
Go
15 lines
626 B
Go
package rgsw
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import (
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"github.com/luxdefi/lattice/v5/core/rlwe"
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"github.com/luxdefi/lattice/v5/ring"
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)
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// NoiseRGSWCiphertext returns the log2 of the standard deviation of the noise of each component of the RGSW ciphertext.
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// pt must be in the NTT and Montgomery domain
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func NoiseRGSWCiphertext(ct *Ciphertext, pt ring.Poly, sk *rlwe.SecretKey, params rlwe.Parameters) (float64, float64) {
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ptsk := *pt.CopyNew()
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params.RingQ().AtLevel(ct.LevelQ()).MulCoeffsMontgomery(ptsk, sk.Value.Q, ptsk)
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return rlwe.NoiseGadgetCiphertext(&ct.Value[0], pt, sk, params), rlwe.NoiseGadgetCiphertext(&ct.Value[1], ptsk, sk, params)
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}
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