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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto"
"crypto/ed25519"
"testing"
)
func TestSignatureSelection(t *testing.T) {
rsaCert := &testRSAPrivateKey.PublicKey
ecdsaCert := &testECDSAPrivateKey.PublicKey
ed25519Cert := testEd25519PrivateKey.Public().(ed25519.PublicKey)
sigsPKCS1WithSHA := []SignatureScheme{PKCS1WithSHA256, PKCS1WithSHA1}
sigsPSSWithSHA := []SignatureScheme{PSSWithSHA256, PSSWithSHA384}
sigsECDSAWithSHA := []SignatureScheme{ECDSAWithP256AndSHA256, ECDSAWithSHA1}
tests := []struct {
pubkey crypto.PublicKey
peerSigAlgs []SignatureScheme
ourSigAlgs []SignatureScheme
tlsVersion uint16
expectedSigAlg SignatureScheme // if tlsVersion == VersionTLS12
expectedSigType uint8
expectedHash crypto.Hash
}{
// Hash is fixed for RSA in TLS 1.1 and before.
// https://tools.ietf.org/html/rfc4346#page-44
{rsaCert, nil, nil, VersionTLS11, 0, signaturePKCS1v15, crypto.MD5SHA1},
{rsaCert, nil, nil, VersionTLS10, 0, signaturePKCS1v15, crypto.MD5SHA1},
// Before TLS 1.2, there is no signature_algorithms extension
// nor field in CertificateRequest and digitally-signed and thus
// it should be ignored.
{rsaCert, sigsPKCS1WithSHA, nil, VersionTLS11, 0, signaturePKCS1v15, crypto.MD5SHA1},
{rsaCert, sigsPKCS1WithSHA, sigsPKCS1WithSHA, VersionTLS11, 0, signaturePKCS1v15, crypto.MD5SHA1},
// Use SHA-1 for TLS 1.0 and 1.1 with ECDSA, see https://tools.ietf.org/html/rfc4492#page-20
{ecdsaCert, sigsPKCS1WithSHA, sigsPKCS1WithSHA, VersionTLS11, 0, signatureECDSA, crypto.SHA1},
{ecdsaCert, sigsPKCS1WithSHA, sigsPKCS1WithSHA, VersionTLS10, 0, signatureECDSA, crypto.SHA1},
// TLS 1.2 without signature_algorithms extension
// https://tools.ietf.org/html/rfc5246#page-47
{rsaCert, nil, sigsPKCS1WithSHA, VersionTLS12, PKCS1WithSHA1, signaturePKCS1v15, crypto.SHA1},
{ecdsaCert, nil, sigsPKCS1WithSHA, VersionTLS12, ECDSAWithSHA1, signatureECDSA, crypto.SHA1},
{rsaCert, []SignatureScheme{PKCS1WithSHA1}, sigsPKCS1WithSHA, VersionTLS12, PKCS1WithSHA1, signaturePKCS1v15, crypto.SHA1},
{rsaCert, []SignatureScheme{PKCS1WithSHA256}, sigsPKCS1WithSHA, VersionTLS12, PKCS1WithSHA256, signaturePKCS1v15, crypto.SHA256},
// "sha_hash" may denote hashes other than SHA-1
// https://tools.ietf.org/html/draft-ietf-tls-rfc4492bis-17#page-17
{ecdsaCert, []SignatureScheme{ECDSAWithSHA1}, sigsECDSAWithSHA, VersionTLS12, ECDSAWithSHA1, signatureECDSA, crypto.SHA1},
{ecdsaCert, []SignatureScheme{ECDSAWithP256AndSHA256}, sigsECDSAWithSHA, VersionTLS12, ECDSAWithP256AndSHA256, signatureECDSA, crypto.SHA256},
// RSASSA-PSS is defined in TLS 1.3 for TLS 1.2
// https://tools.ietf.org/html/draft-ietf-tls-tls13-21#page-45
{rsaCert, []SignatureScheme{PSSWithSHA256}, sigsPSSWithSHA, VersionTLS12, PSSWithSHA256, signatureRSAPSS, crypto.SHA256},
// All results are fixed for Ed25519. RFC 8422, Section 5.10.
{ed25519Cert, []SignatureScheme{Ed25519}, []SignatureScheme{ECDSAWithSHA1, Ed25519}, VersionTLS12, Ed25519, signatureEd25519, directSigning},
{ed25519Cert, nil, nil, VersionTLS12, Ed25519, signatureEd25519, directSigning},
}
for testNo, test := range tests {
sigAlg, sigType, hashFunc, err := pickSignatureAlgorithm(test.pubkey, test.peerSigAlgs, test.ourSigAlgs, test.tlsVersion)
if err != nil {
t.Errorf("test[%d]: unexpected error: %v", testNo, err)
}
if test.tlsVersion == VersionTLS12 && test.expectedSigAlg != sigAlg {
t.Errorf("test[%d]: expected signature scheme %#x, got %#x", testNo, test.expectedSigAlg, sigAlg)
}
if test.expectedSigType != sigType {
t.Errorf("test[%d]: expected signature algorithm %#x, got %#x", testNo, test.expectedSigType, sigType)
}
if test.expectedHash != hashFunc {
t.Errorf("test[%d]: expected hash function %#x, got %#x", testNo, test.expectedHash, hashFunc)
}
}
badTests := []struct {
pubkey crypto.PublicKey
peerSigAlgs []SignatureScheme
ourSigAlgs []SignatureScheme
tlsVersion uint16
}{
{rsaCert, sigsECDSAWithSHA, sigsPKCS1WithSHA, VersionTLS12},
{ecdsaCert, sigsPKCS1WithSHA, sigsPKCS1WithSHA, VersionTLS12},
{ecdsaCert, sigsECDSAWithSHA, sigsPKCS1WithSHA, VersionTLS12},
{rsaCert, []SignatureScheme{0}, sigsPKCS1WithSHA, VersionTLS12},
{ed25519Cert, sigsECDSAWithSHA, sigsECDSAWithSHA, VersionTLS12},
{ed25519Cert, []SignatureScheme{Ed25519}, sigsECDSAWithSHA, VersionTLS12},
{ecdsaCert, []SignatureScheme{Ed25519}, []SignatureScheme{Ed25519}, VersionTLS12},
{ed25519Cert, nil, nil, VersionTLS11},
{ed25519Cert, nil, nil, VersionTLS10},
}
for testNo, test := range badTests {
sigAlg, sigType, hashFunc, err := pickSignatureAlgorithm(test.pubkey, test.peerSigAlgs, test.ourSigAlgs, test.tlsVersion)
if err == nil {
t.Errorf("test[%d]: unexpected success, got %#x %#x %#x", testNo, sigAlg, sigType, hashFunc)
}
}
}