mirror of
https://github.com/henrydcase/nobs.git
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85 lines
2.7 KiB
Go
85 lines
2.7 KiB
Go
package sidh
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import (
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. "github.com/henrydcase/nobs/dh/sidh/internal/isogeny"
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p503 "github.com/henrydcase/nobs/dh/sidh/p503"
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p751 "github.com/henrydcase/nobs/dh/sidh/p751"
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)
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// Keeps mapping: SIDH prime field ID to domain parameters
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var sidhParams = make(map[uint8]SidhParams)
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// Params returns domain parameters corresponding to finite field and identified by
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// `id` provieded by the caller. Function panics in case `id` wasn't registered earlier.
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func Params(id uint8) *SidhParams {
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if val, ok := sidhParams[id]; ok {
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return &val
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}
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panic("sidh: SIDH Params ID unregistered")
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}
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func init() {
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p503 := SidhParams{
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Id: FP_503,
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PublicKeySize: p503.P503_PublicKeySize,
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SharedSecretSize: p503.P503_SharedSecretSize,
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A: DomainParams{
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Affine_P: p503.P503_affine_PA,
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Affine_Q: p503.P503_affine_QA,
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Affine_R: p503.P503_affine_RA,
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IsogenyStrategy: p503.P503_AliceIsogenyStrategy[:],
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SecretBitLen: p503.P503_SecretBitLenA,
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SecretByteLen: uint((p503.P503_SecretBitLenA + 7) / 8),
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},
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B: DomainParams{
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Affine_P: p503.P503_affine_PB,
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Affine_Q: p503.P503_affine_QB,
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Affine_R: p503.P503_affine_RB,
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IsogenyStrategy: p503.P503_BobIsogenyStrategy[:],
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SecretBitLen: p503.P503_SecretBitLenB,
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SecretByteLen: uint((p503.P503_SecretBitLenB + 7) / 8),
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},
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OneFp2: p503.P503_OneFp2,
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HalfFp2: p503.P503_HalfFp2,
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MsgLen: 24,
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// SIKEp751 provides 192 bit of classical security ([SIKE], 5.1)
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KemSize: 16,
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SampleRate: p503.P503_SampleRate,
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Bytelen: p503.P503_Bytelen,
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Op: p503.FieldOperations(),
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}
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p751 := SidhParams{
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Id: FP_751,
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PublicKeySize: p751.P751_PublicKeySize,
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SharedSecretSize: p751.P751_SharedSecretSize,
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A: DomainParams{
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Affine_P: p751.P751_affine_PA,
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Affine_Q: p751.P751_affine_QA,
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Affine_R: p751.P751_affine_RA,
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IsogenyStrategy: p751.P751_AliceIsogenyStrategy[:],
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SecretBitLen: p751.P751_SecretBitLenA,
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SecretByteLen: uint((p751.P751_SecretBitLenA + 7) / 8),
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},
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B: DomainParams{
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Affine_P: p751.P751_affine_PB,
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Affine_Q: p751.P751_affine_QB,
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Affine_R: p751.P751_affine_RB,
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IsogenyStrategy: p751.P751_BobIsogenyStrategy[:],
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SecretBitLen: p751.P751_SecretBitLenB,
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SecretByteLen: uint((p751.P751_SecretBitLenB + 7) / 8),
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},
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OneFp2: p751.P751_OneFp2,
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HalfFp2: p751.P751_HalfFp2,
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MsgLen: 32,
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// SIKEp751 provides 192 bit of classical security ([SIKE], 5.1)
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KemSize: 24,
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SampleRate: p751.P751_SampleRate,
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Bytelen: p751.P751_Bytelen,
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Op: p751.FieldOperations(),
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}
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sidhParams[FP_503] = p503
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sidhParams[FP_751] = p751
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}
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