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116 lines
2.8 KiB
Go
116 lines
2.8 KiB
Go
// params.go - Kyber parameterization.
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//
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// To the extent possible under law, Yawning Angel has waived all copyright
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// and related or neighboring rights to the software, using the Creative
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// Commons "CC0" public domain dedication. See LICENSE or
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// <http://creativecommons.org/publicdomain/zero/1.0/> for full details.
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package kyber
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const (
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// SymSize is the size of the shared key (and certain internal parameters
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// such as hashes and seeds) in bytes.
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SymSize = 32
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kyberN = 256
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kyberQ = 7681
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polySize = 416
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polyCompressedSize = 96
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compressedCoeffSize = 352
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)
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var (
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// Kyber512 is the Kyber-512 parameter set, which aims to provide security
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// equivalent to AES-128.
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//
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// This parameter set has a 1632 byte private key, 736 byte public key,
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// and a 800 byte cipher text.
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Kyber512 = newParameterSet("Kyber-512", 2)
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// Kyber768 is the Kyber-768 parameter set, which aims to provide security
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// equivalent to AES-192.
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//
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// This parameter set has a 2400 byte private key, 1088 byte public key,
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// and a 1152 byte cipher text.
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Kyber768 = newParameterSet("Kyber-768", 3)
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// Kyber1024 is the Kyber-1024 parameter set, which aims to provide
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// security equivalent to AES-256.
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//
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// This parameter set has a 3168 byte private key, 1440 byte public key,
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// and a 1504 byte cipher text.
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Kyber1024 = newParameterSet("Kyber-1024", 4)
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)
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// ParameterSet is a Kyber parameter set.
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type ParameterSet struct {
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name string
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k int
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eta int
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polyVecSize int
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polyVecCompressedSize int
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indcpaMsgSize int
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indcpaPublicKeySize int
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indcpaSecretKeySize int
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indcpaSize int
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publicKeySize int
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secretKeySize int
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cipherTextSize int
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}
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// Name returns the name of a given ParameterSet.
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func (p *ParameterSet) Name() string {
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return p.name
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}
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// PublicKeySize returns the size of a public key in bytes.
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func (p *ParameterSet) PublicKeySize() int {
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return p.publicKeySize
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}
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// PrivateKeySize returns the size of a private key in bytes.
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func (p *ParameterSet) PrivateKeySize() int {
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return p.secretKeySize
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}
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// CipherTextSize returns the size of a cipher text in bytes.
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func (p *ParameterSet) CipherTextSize() int {
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return p.cipherTextSize
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}
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func newParameterSet(name string, k int) *ParameterSet {
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var p ParameterSet
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p.name = name
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p.k = k
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switch k {
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case 2:
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p.eta = 5
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case 3:
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p.eta = 4
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case 4:
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p.eta = 3
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default:
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panic("kyber: k must be in {2,3,4}")
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}
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p.polyVecSize = k * polySize
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p.polyVecCompressedSize = k * compressedCoeffSize
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p.indcpaMsgSize = SymSize
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p.indcpaPublicKeySize = p.polyVecCompressedSize + SymSize
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p.indcpaSecretKeySize = p.polyVecSize
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p.indcpaSize = p.polyVecCompressedSize + polyCompressedSize
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p.publicKeySize = p.indcpaPublicKeySize
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p.secretKeySize = p.indcpaSecretKeySize + p.indcpaPublicKeySize + 2*SymSize // 32 bytes of additional space to save H(pk)
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p.cipherTextSize = p.indcpaSize
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return &p
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}
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