crypto/x509: rename and reposition rsaPublicKey struct declaration

For consistency with the other named types in this package, this
change renames the unexported rsaPublicKey struct to pkcs1PublicKey
and positions the declaration up with the other similarly-named
types in pkcs1.go.

See the final comment of #19355 for discussion.

Change-Id: I1fa0366a8efa01602b81bc69287ef747abce84f5
Reviewed-on: https://go-review.googlesource.com/37885Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/crypto/x509/pkcs1.go

@@ -35,6 +35,12 @@ type pkcs1AdditionalRSAPrime struct {
 	Coeff *big.Int
 }
 
+// pkcs1PublicKey reflects the ASN.1 structure of a PKCS#1 public key.
+type pkcs1PublicKey struct {
+	N *big.Int
+	E int
+}
+
 // ParsePKCS1PrivateKey returns an RSA private key from its ASN.1 PKCS#1 DER encoded form.
 func ParsePKCS1PrivateKey(der []byte) (*rsa.PrivateKey, error) {
 	var priv pkcs1PrivateKey
@@ -113,9 +119,3 @@ func MarshalPKCS1PrivateKey(key *rsa.PrivateKey) []byte {
 	b, _ := asn1.Marshal(priv)
 	return b
 }
-
-// rsaPublicKey reflects the ASN.1 structure of a PKCS#1 public key.
-type rsaPublicKey struct {
-	N *big.Int
-	E int
-}

src/crypto/x509/x509.go

@@ -59,7 +59,7 @@ func ParsePKIXPublicKey(derBytes []byte) (pub interface{}, err error) {
 func marshalPublicKey(pub interface{}) (publicKeyBytes []byte, publicKeyAlgorithm pkix.AlgorithmIdentifier, err error) {
 	switch pub := pub.(type) {
 	case *rsa.PublicKey:
-		publicKeyBytes, err = asn1.Marshal(rsaPublicKey{
+		publicKeyBytes, err = asn1.Marshal(pkcs1PublicKey{
 			N: pub.N,
 			E: pub.E,
 		})
@@ -941,7 +941,7 @@ func parsePublicKey(algo PublicKeyAlgorithm, keyData *publicKeyInfo) (interface{
 			return nil, errors.New("x509: RSA key missing NULL parameters")
 		}
 
-		p := new(rsaPublicKey)
+		p := new(pkcs1PublicKey)
 		rest, err := asn1.Unmarshal(asn1Data, p)
 		if err != nil {
 			return nil, err