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// Copyright 2019 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 wycheproof
import (
func TestRsaPss(t *testing.T) {
// KeyJwk Public key in JWK format
type KeyJwk struct {
// Notes a description of the labels used in the test vectors
type Notes struct {
// SignatureTestVector
type SignatureTestVector struct {
// A brief description of the test case
Comment string `json:"comment,omitempty"`
// A list of flags
Flags []string `json:"flags,omitempty"`
// The message to sign
Msg string `json:"msg,omitempty"`
// Test result
Result string `json:"result,omitempty"`
// A signature for msg
Sig string `json:"sig,omitempty"`
// Identifier of the test case
TcId int `json:"tcId,omitempty"`
// RsassaPkcs1TestGroup
type RsassaPkcs1TestGroup struct {
// The private exponent
D string `json:"d,omitempty"`
// The public exponent
E string `json:"e,omitempty"`
// ASN encoding of the sequence [n, e]
KeyAsn string `json:"keyAsn,omitempty"`
// ASN encoding of the public key
KeyDer string `json:"keyDer,omitempty"`
// Public key in JWK format
KeyJwk *KeyJwk `json:"keyJwk,omitempty"`
// Pem encoded public key
KeyPem string `json:"keyPem,omitempty"`
// the size of the modulus in bits
KeySize int `json:"keySize,omitempty"`
// The modulus of the key
N string `json:"n,omitempty"`
// The salt length
SLen int `json:"sLen,omitempty"`
// the hash function used for the message
Sha string `json:"sha,omitempty"`
Tests []*SignatureTestVector `json:"tests,omitempty"`
Type interface{} `json:"type,omitempty"`
// Root
type Root struct {
// the primitive tested in the test file
Algorithm string `json:"algorithm,omitempty"`
// the version of the test vectors.
GeneratorVersion string `json:"generatorVersion,omitempty"`
// additional documentation
Header []string `json:"header,omitempty"`
// a description of the labels used in the test vectors
Notes *Notes `json:"notes,omitempty"`
// the number of test vectors in this test
NumberOfTests int `json:"numberOfTests,omitempty"`
Schema interface{} `json:"schema,omitempty"`
TestGroups []*RsassaPkcs1TestGroup `json:"testGroups,omitempty"`
flagsShouldPass := map[string]bool{
// A signature using a weaker hash than the EC params is not a security risk, as long as the hash is secure.
"WeakHash": true,
// filesOverrideToPassZeroSLen is a map of all test files
// and which TcIds that should be overriden to pass if the
// rsa.PSSOptions.SaltLength is zero.
// These tests expect a failure with a PSSOptions.SaltLength: 0
// and a signature that uses a different salt length. However,
// a salt length of 0 is defined as rsa.PSSSaltLengthAuto which
// works deterministically to auto-detect the length when
// verifying, so these tests actually pass as they should.
filesOverrideToPassZeroSLen := map[string][]int{
"rsa_pss_2048_sha1_mgf1_20_test.json": []int{46, 47},
"rsa_pss_2048_sha256_mgf1_0_test.json": []int{67, 68},
"rsa_pss_2048_sha256_mgf1_32_test.json": []int{67, 68},
"rsa_pss_2048_sha512_256_mgf1_28_test.json": []int{13, 14, 15},
"rsa_pss_2048_sha512_256_mgf1_32_test.json": []int{13, 14},
"rsa_pss_3072_sha256_mgf1_32_test.json": []int{67, 68},
"rsa_pss_4096_sha256_mgf1_32_test.json": []int{67, 68},
"rsa_pss_4096_sha512_mgf1_32_test.json": []int{136, 137},
// "rsa_pss_misc_test.json": nil, // TODO: This ones seems to be broken right now, but can enable later on.
for f := range filesOverrideToPassZeroSLen {
var root Root
readTestVector(t, f, &root)
for _, tg := range root.TestGroups {
pub := decodePublicKey(tg.KeyDer).(*rsa.PublicKey)
ch := parseHash(tg.Sha)
h := ch.New()
opts := &rsa.PSSOptions{
Hash: ch,
SaltLength: rsa.PSSSaltLengthAuto,
// Run all the tests twice: the first time with the salt length
// as PSSSaltLengthAuto, and the second time with the salt length
// explictily set to tg.SLen.
for i := 0; i < 2; i++ {
for _, sig := range tg.Tests {
hashed := h.Sum(nil)
err := rsa.VerifyPSS(pub, ch, hashed, decodeHex(sig.Sig), opts)
want := shouldPass(sig.Result, sig.Flags, flagsShouldPass)
if opts.SaltLength == 0 {
for _, id := range filesOverrideToPassZeroSLen[f] {
if sig.TcId == id {
want = true
if (err == nil) != want {
t.Errorf("file: %v, tcid: %d, type: %s, opts.SaltLength: %v, comment: %q, wanted success: %t", f, sig.TcId, sig.Result, opts.SaltLength, sig.Comment, want)
// Update opts.SaltLength for the second run of the tests.
opts.SaltLength = tg.SLen