crypto/ecdsa: make Sign safe with broken entropy sources

ECDSA is unsafe to use if an entropy source produces predictable
output for the ephemeral nonces. E.g., [Nguyen]. A simple
countermeasure is to hash the secret key, the message, and
entropy together to seed a CSPRNG, from which the ephemeral key
is derived.

Fixes #9452

--

This is a minimalist (in terms of patch size) solution, though
not the most parsimonious in its use of primitives:

   - csprng_key = ChopMD-256(SHA2-512(priv.D||entropy||hash))
   - reader = AES-256-CTR(k=csprng_key)

This, however, provides at most 128-bit collision-resistance,
so that Adv will have a term related to the number of messages
signed that is significantly worse than plain ECDSA. This does
not seem to be of any practical importance.

ChopMD-256(SHA2-512(x)) is used, rather than SHA2-256(x), for
two sets of reasons:

*Practical:* SHA2-512 has a larger state and 16 more rounds; it
is likely non-generically stronger than SHA2-256. And, AFAIK,
cryptanalysis backs this up. (E.g., [Biryukov] gives a
distinguisher on 47-round SHA2-256 with cost < 2^85.) This is
well below a reasonable security-strength target.

*Theoretical:* [Coron] and [Chang] show that Chop-MD(F(x)) is
indifferentiable from a random oracle for slightly beyond the
birthday barrier. It seems likely that this makes a generic
security proof that this construction remains UF-CMA is
possible in the indifferentiability framework.

--

Many thanks to Payman Mohassel for reviewing this construction;
any mistakes are mine, however. And, as he notes, reusing the
private key in this way means that the generic-group (non-RO)
proof of ECDSA's security given in [Brown] no longer directly
applies.

--

[Brown]: http://www.cacr.math.uwaterloo.ca/techreports/2000/corr2000-54.ps
"Brown. The exact security of ECDSA. 2000"

[Coron]: https://www.cs.nyu.edu/~puniya/papers/merkle.pdf
"Coron et al. Merkle-Damgard revisited. 2005"

[Chang]: https://www.iacr.org/archive/fse2008/50860436/50860436.pdf
"Chang and Nandi. Improved indifferentiability security analysis
of chopMD hash function. 2008"

[Biryukov]: http://www.iacr.org/archive/asiacrypt2011/70730269/70730269.pdf
"Biryukov et al. Second-order differential collisions for reduced
SHA-256. 2011"

[Nguyen]: ftp://ftp.di.ens.fr/pub/users/pnguyen/PubECDSA.ps
"Nguyen and Shparlinski. The insecurity of the elliptic curve
digital signature algorithm with partially known nonces. 2003"

New tests:

  TestNonceSafety: Check that signatures are safe even with a
    broken entropy source.

  TestINDCCA: Check that signatures remain non-deterministic
    with a functional entropy source.

Updated "golden" KATs in crypto/tls/testdata that use ECDSA suites.

Change-Id: I55337a2fbec2e42a36ce719bd2184793682d678a
Reviewed-on: https://go-review.googlesource.com/3340
Reviewed-by: Adam Langley <agl@golang.org>

src/crypto/ecdsa/ecdsa_test.go

@@ -72,6 +72,78 @@ func TestSignAndVerify(t *testing.T) {
 	testSignAndVerify(t, elliptic.P521(), "p521")
 }
 
+func testNonceSafety(t *testing.T, c elliptic.Curve, tag string) {
+	priv, _ := GenerateKey(c, rand.Reader)
+
+	hashed := []byte("testing")
+	r0, s0, err := Sign(zeroReader, priv, hashed)
+	if err != nil {
+		t.Errorf("%s: error signing: %s", tag, err)
+		return
+	}
+
+	hashed = []byte("testing...")
+	r1, s1, err := Sign(zeroReader, priv, hashed)
+	if err != nil {
+		t.Errorf("%s: error signing: %s", tag, err)
+		return
+	}
+
+	if s0.Cmp(s1) == 0 {
+		// This should never happen.
+		t.Errorf("%s: the signatures on two different messages were the same")
+	}
+
+	if r0.Cmp(r1) == 0 {
+		t.Errorf("%s: the nonce used for two diferent messages was the same")
+	}
+}
+
+func TestNonceSafety(t *testing.T) {
+	testNonceSafety(t, elliptic.P224(), "p224")
+	if testing.Short() {
+		return
+	}
+	testNonceSafety(t, elliptic.P256(), "p256")
+	testNonceSafety(t, elliptic.P384(), "p384")
+	testNonceSafety(t, elliptic.P521(), "p521")
+}
+
+func testINDCCA(t *testing.T, c elliptic.Curve, tag string) {
+	priv, _ := GenerateKey(c, rand.Reader)
+
+	hashed := []byte("testing")
+	r0, s0, err := Sign(rand.Reader, priv, hashed)
+	if err != nil {
+		t.Errorf("%s: error signing: %s", tag, err)
+		return
+	}
+
+	r1, s1, err := Sign(rand.Reader, priv, hashed)
+	if err != nil {
+		t.Errorf("%s: error signing: %s", tag, err)
+		return
+	}
+
+	if s0.Cmp(s1) == 0 {
+		t.Errorf("%s: two signatures of the same message produced the same result")
+	}
+
+	if r0.Cmp(r1) == 0 {
+		t.Errorf("%s: two signatures of the same message produced the same nonce")
+	}
+}
+
+func TestINDCCA(t *testing.T) {
+	testINDCCA(t, elliptic.P224(), "p224")
+	if testing.Short() {
+		return
+	}
+	testINDCCA(t, elliptic.P256(), "p256")
+	testINDCCA(t, elliptic.P384(), "p384")
+	testINDCCA(t, elliptic.P521(), "p521")
+}
+
 func fromHex(s string) *big.Int {
 	r, ok := new(big.Int).SetString(s, 16)
 	if !ok {