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https://github.com/tuneinsight/lattigo.git
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e9e04b1445
CHANGELOG: - Update of `PrecisionStats` in `ckks/precision.go`: - precision/error stats computed as log2 of min/max/average/... - fields renamed (`MinPrecision` -> `MINLog2Prec`, `MaxPrecision` -> `MAXLog2Prec`, ...) - `rlwe.Scale` has a `.Log2()` method - Update of `mod1.Parameters` fields (made public, some removed) - Improvement of the relinearization key-generation protocol (reduce the degree of the shares) - Serialisation of bootstrapping keys - Lower noise incurred by `ModUp` - Evaluation keys can be compressed (public element `a` can be generated from a seed) - More doc formatting - Fix various bugs: - `ShallowCopy` of the CKKS bootstrapping evaluator and BFV evaluator not deep enough. - PSI example failing - Incorrect reset of pointer in uniform sampler - Error when doing inverse NTT with small degree - Mod1Evaluator changes the input ciphertext Co-authored-by: Andrea Caforio <andrea.caforio@protonmail.com> Co-authored-by: Jean-Philippe Bossuat <jean-philippe@tuneinsight.com>
72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
package rlwe
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import (
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"fmt"
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"github.com/tuneinsight/lattigo/v6/ring"
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"github.com/tuneinsight/lattigo/v6/utils/sampling"
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)
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// Ciphertext is a generic type for RLWE ciphertexts.
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type Ciphertext struct {
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Element[ring.Poly]
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}
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// NewCiphertext returns a new [Ciphertext] with zero values and an associated
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// MetaData set to the Parameters default value.
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func NewCiphertext(params ParameterProvider, degree int, level ...int) (ct *Ciphertext) {
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op := *NewElement(params, degree, level...)
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return &Ciphertext{op}
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}
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// NewCiphertextAtLevelFromPoly constructs a new [Ciphertext] at a specific level
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// where the message is set to the passed poly. No checks are performed on poly and
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// the returned [Ciphertext] will share its backing array of coefficients.
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// Returned [Ciphertext]'s MetaData is allocated but empty.
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func NewCiphertextAtLevelFromPoly(level int, poly []ring.Poly) (*Ciphertext, error) {
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operand, err := NewElementAtLevelFromPoly(level, poly)
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if err != nil {
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return nil, fmt.Errorf("cannot NewCiphertextAtLevelFromPoly: %w", err)
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}
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operand.MetaData = &MetaData{}
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return &Ciphertext{*operand}, nil
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}
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// NewCiphertextRandom generates a new uniformly distributed [Ciphertext] of degree, level.
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func NewCiphertextRandom(prng sampling.PRNG, params ParameterProvider, degree, level int) (ciphertext *Ciphertext) {
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ciphertext = NewCiphertext(params, degree, level)
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PopulateElementRandom(prng, params, ciphertext.El())
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return
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}
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// Plaintext casts the target ciphertext into a plaintext type.
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// This method is allocation free.
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func (ct Ciphertext) Plaintext() *Plaintext {
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return &Plaintext{
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Element: Element[ring.Poly]{
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Value: ct.Element.Value[:1],
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MetaData: ct.MetaData,
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},
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Value: ct.Element.Value[0],
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}
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}
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// CopyNew creates a new element as a copy of the target element.
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func (ct Ciphertext) CopyNew() *Ciphertext {
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return &Ciphertext{Element: *ct.Element.CopyNew()}
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}
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// Copy copies the input element and its parameters on the target element.
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func (ct Ciphertext) Copy(ctxCopy *Ciphertext) {
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ct.Element.Copy(&ctxCopy.Element)
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}
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// Equal performs a deep equal.
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func (ct Ciphertext) Equal(other *Ciphertext) bool {
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return ct.Element.Equal(&other.Element)
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}
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