removes P751_SecretKeySize and P751_SampleRate

Those two constnts are not used anymore and can be safely removed
as it is not used anymore. SidhParams struct was also modified.

internal/isogeny/types.go

@@ -43,8 +43,6 @@ type SidhParams struct {
     SharedSecretSize uint
     // 2- and 3-torsion group parameter definitions
     A, B DomainParams
-    // Sample rate to obtain a value in [0,3^238]
-    SampleRate uint
     // Precomputed identity element in the Fp2 in Montgomery domain
     OneFp2 Fp2Element
     // Precomputed 1/2 in the Fp2 in Montgomery domain

p751/consts.go

@@ -3,10 +3,6 @@ package p751
 import . "github.com/cloudflare/p751sidh/internal/isogeny"
 
 const (
-	// The secret key size, in bytes. Secret key is actually different for
-	// torsion group 2 and 3. For 2-torsion group, last byte of secret key
-	// is always set to 0.
-	P751_SecretKeySize = 48
 	// SIDH public key byte size
 	P751_PublicKeySize = 564
 	// SIDH shared secret byte size.
@@ -15,8 +11,6 @@ const (
 	P751_SecretBitLenA = 372
 	// Size of secret key for 3-torsion group, corresponds to log_2(3^e3)
 	P751_SecretBitLenB = 379
-	// Sample rate to obtain a value in [0,3^238]
-	P751_SampleRate = 102
 	// P751 bytelen ceil(751/8)
 	P751_Bytelen = 94
 	// Size of a compuatation strategy for 2-torsion group

sidh/params.go

@@ -43,7 +43,6 @@ func init() {
 		MsgLen: 32,
 		// SIKEp751 provides 192 bit of classical security ([SIKE], 5.1)
 		KemSize:    24,
-		SampleRate: p751.P751_SampleRate,
 		Bytelen: p751.P751_Bytelen,
 		Op: p751.FieldOperations(),
 	}