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package sidh
import (
. "github.com/cloudflare/sidh/internal/isogeny"
p503 "github.com/cloudflare/sidh/p503"
p751 "github.com/cloudflare/sidh/p751"
)
// Keeps mapping: SIDH prime field ID to domain parameters
var sidhParams = make(map[uint8]SidhParams)
// Params returns domain parameters corresponding to finite field and identified by
// `id` provieded by the caller. Function panics in case `id` wasn't registered earlier.
func Params(id uint8) *SidhParams {
if val, ok := sidhParams[id]; ok {
return &val
}
panic("sidh: SIDH Params ID unregistered")
}
func init() {
p503 := SidhParams{
Id: FP_503,
PublicKeySize: p503.P503_PublicKeySize,
SharedSecretSize: p503.P503_SharedSecretSize,
A: DomainParams{
Affine_P: p503.P503_affine_PA,
Affine_Q: p503.P503_affine_QA,
Affine_R: p503.P503_affine_RA,
SecretBitLen: p503.P503_SecretBitLenA,
SecretByteLen: uint((p503.P503_SecretBitLenA + 7) / 8),
IsogenyStrategy: p503.P503_AliceIsogenyStrategy[:],
},
B: DomainParams{
Affine_P: p503.P503_affine_PB,
Affine_Q: p503.P503_affine_QB,
Affine_R: p503.P503_affine_RB,
SecretBitLen: p503.P503_SecretBitLenB,
SecretByteLen: uint((p503.P503_SecretBitLenB + 7) / 8),
IsogenyStrategy: p503.P503_BobIsogenyStrategy[:],
},
OneFp2: p503.P503_OneFp2,
HalfFp2: p503.P503_HalfFp2,
MsgLen: 24,
// SIKEp751 provides 128 bit of classical security ([SIKE], 5.1)
KemSize: 16,
Bytelen: p503.P503_Bytelen,
Op: p503.FieldOperations(),
}
p751 := SidhParams{
Id: FP_751,
PublicKeySize: p751.P751_PublicKeySize,
SharedSecretSize: p751.P751_SharedSecretSize,
A: DomainParams{
Affine_P: p751.P751_affine_PA,
Affine_Q: p751.P751_affine_QA,
Affine_R: p751.P751_affine_RA,
IsogenyStrategy: p751.P751_AliceIsogenyStrategy[:],
SecretBitLen: p751.P751_SecretBitLenA,
SecretByteLen: uint((p751.P751_SecretBitLenA + 7) / 8),
},
B: DomainParams{
Affine_P: p751.P751_affine_PB,
Affine_Q: p751.P751_affine_QB,
Affine_R: p751.P751_affine_RB,
IsogenyStrategy: p751.P751_BobIsogenyStrategy[:],
SecretBitLen: p751.P751_SecretBitLenB,
SecretByteLen: uint((p751.P751_SecretBitLenB + 7) / 8),
},
OneFp2: p751.P751_OneFp2,
HalfFp2: p751.P751_HalfFp2,
MsgLen: 32,
// SIKEp751 provides 192 bit of classical security ([SIKE], 5.1)
KemSize: 24,
Bytelen: p751.P751_Bytelen,
Op: p751.FieldOperations(),
}
sidhParams[FP_503] = p503
sidhParams[FP_751] = p751
}
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