crypto: fix docstrings and comments

crypto/bn256/google/bn256.go

@@ -29,7 +29,7 @@ import (
 )
 
 // BUG(agl): this implementation is not constant time.
-// TODO(agl): keep GF(p²) elements in Mongomery form.
+// TODO(agl): keep GF(p²) elements in Montgomery form.
 
 // G1 is an abstract cyclic group. The zero value is suitable for use as the
 // output of an operation, but cannot be used as an input.

crypto/secp256k1/secp256_test.go

@@ -48,7 +48,7 @@ func randSig() []byte {
 }
 
 // tests for malleability
-// highest bit of signature ECDSA s value must be 0, in the 33th byte
+// the highest bit of signature ECDSA s value must be 0, in the 33th byte
 func compactSigCheck(t *testing.T, sig []byte) {
 	var b = int(sig[32])
 	if b < 0 {

crypto/signature_nocgo.go

@@ -164,7 +164,7 @@ type btCurve struct {
 	*btcec.KoblitzCurve
 }
 
-// Marshall converts a point given as (x, y) into a byte slice.
+// Marshal converts a point given as (x, y) into a byte slice.
 func (curve btCurve) Marshal(x, y *big.Int) []byte {
 	byteLen := (curve.Params().BitSize + 7) / 8
 

crypto/signature_test.go

@@ -71,7 +71,7 @@ func TestVerifySignature(t *testing.T) {
 	wrongkey := common.CopyBytes(testpubkey)
 	wrongkey[10]++
 	if VerifySignature(wrongkey, testmsg, sig) {
-		t.Errorf("signature valid with with wrong public key")
+		t.Errorf("signature valid with wrong public key")
 	}
 }