[dev.boringcrypto] all: merge master into dev.boringcrypto

Change-Id: I083d1e4e997b30d9fab10940401eaf160e36f6c1

1 files changed, 14 insertions, 0 deletions

diff --git a/src/crypto/ecdsa/ecdsa.go b/src/crypto/ecdsa/ecdsa.go
index 08a0533aa7..04738cdbd7 100644
--- a/src/crypto/ecdsa/ecdsa.go
+++ b/src/crypto/ecdsa/ecdsa.go
@@ -69,6 +69,9 @@ type PublicKey struct {
 	boring unsafe.Pointer
 }
 
+// Any methods implemented on PublicKey might need to also be implemented on
+// PrivateKey, as the latter embeds the former and will expose its methods.
+
 // Equal reports whether pub and x have the same value.
 //
 // Two keys are only considered to have the same value if they have the same Curve value.
@@ -100,6 +103,17 @@ func (priv *PrivateKey) Public() crypto.PublicKey {
 	return &priv.PublicKey
 }
 
+// Equal reports whether priv and x have the same value.
+//
+// See PublicKey.Equal for details on how Curve is compared.
+func (priv *PrivateKey) Equal(x crypto.PrivateKey) bool {
+	xx, ok := x.(*PrivateKey)
+	if !ok {
+		return false
+	}
+	return priv.PublicKey.Equal(&xx.PublicKey) && priv.D.Cmp(xx.D) == 0
+}
+
 // Sign signs digest with priv, reading randomness from rand. The opts argument
 // is not currently used but, in keeping with the crypto.Signer interface,
 // should be the hash function used to digest the message.