From 7f63de1d35b0f77fa2b9faea3e7deb402a2383c8 Mon Sep 17 00:00:00 2001 From: Roland Shoemaker Date: Thu, 21 May 2020 20:45:11 -0700 Subject: [PATCH] internal/wycheproof: add RSA OAEP decryption tests Uses only the test vectors that use the same MGF and label hashes. Change-Id: I971f78556e7b8fdbc785978dca7a613728676697 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/234917 Trust: Roland Shoemaker Trust: Katie Hockman Run-TryBot: Roland Shoemaker TryBot-Result: Go Bot Reviewed-by: Katie Hockman --- internal/wycheproof/rsa_oaep_decrypt_test.go | 149 +++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 internal/wycheproof/rsa_oaep_decrypt_test.go diff --git a/internal/wycheproof/rsa_oaep_decrypt_test.go b/internal/wycheproof/rsa_oaep_decrypt_test.go new file mode 100644 index 0000000..19cc4fd --- /dev/null +++ b/internal/wycheproof/rsa_oaep_decrypt_test.go @@ -0,0 +1,149 @@ +// Copyright 2020 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 ( + "bytes" + "crypto/rsa" + "crypto/x509" + "fmt" + "testing" +) + +func TestRSAOAEPDecrypt(t *testing.T) { + // Notes a description of the labels used in the test vectors + type Notes struct { + } + + // RsaesOaepTestVector + type RsaesOaepTestVector struct { + + // A brief description of the test case + Comment string `json:"comment,omitempty"` + + // An encryption of msg + Ct string `json:"ct,omitempty"` + + // A list of flags + Flags []string `json:"flags,omitempty"` + + // The label used for the encryption + Label string `json:"label,omitempty"` + + // The encrypted message + Msg string `json:"msg,omitempty"` + + // Test result + Result string `json:"result,omitempty"` + + // Identifier of the test case + TcId int `json:"tcId,omitempty"` + } + + // RsaesOaepTestGroup + type RsaesOaepTestGroup struct { + + // The private exponent + D string `json:"d,omitempty"` + + // The public exponent + E string `json:"e,omitempty"` + + // the message generating function (e.g. MGF1) + Mgf string `json:"mgf,omitempty"` + + // The hash function used for the message generating function. + MgfSha string `json:"mgfSha,omitempty"` + + // The modulus of the key + N string `json:"n,omitempty"` + + // Pem encoded private key + PrivateKeyPem string `json:"privateKeyPem,omitempty"` + + // Pkcs 8 encoded private key. + PrivateKeyPkcs8 string `json:"privateKeyPkcs8,omitempty"` + + // The hash function for hashing the label. + Sha string `json:"sha,omitempty"` + Tests []*RsaesOaepTestVector `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 []*RsaesOaepTestGroup `json:"testGroups,omitempty"` + } + + // rsa.DecryptOAEP doesn't support using a different hash for the + // MGF and the label, so skip all of the test vectors that use + // these unbalanced constructions. rsa_oaep_misc_test.json contains + // both balanced and unbalanced constructions so in that case + // we just filter out any test groups where MgfSha != Sha + files := []string{ + "rsa_oaep_2048_sha1_mgf1sha1_test.json", + "rsa_oaep_2048_sha224_mgf1sha224_test.json", + "rsa_oaep_2048_sha256_mgf1sha256_test.json", + "rsa_oaep_2048_sha384_mgf1sha384_test.json", + "rsa_oaep_2048_sha512_mgf1sha512_test.json", + "rsa_oaep_3072_sha256_mgf1sha256_test.json", + "rsa_oaep_3072_sha512_mgf1sha512_test.json", + "rsa_oaep_4096_sha256_mgf1sha256_test.json", + "rsa_oaep_4096_sha512_mgf1sha512_test.json", + "rsa_oaep_misc_test.json", + } + + flagsShouldPass := map[string]bool{ + // rsa.DecryptOAEP happily supports small key sizes + "SmallModulus": true, + } + + for _, f := range files { + var root Root + readTestVector(t, f, &root) + for _, tg := range root.TestGroups { + if tg.MgfSha != tg.Sha { + continue + } + priv, err := x509.ParsePKCS8PrivateKey(decodeHex(tg.PrivateKeyPkcs8)) + if err != nil { + t.Fatalf("%s failed to parse PKCS #8 private key: %s", f, err) + } + hash := parseHash(tg.Sha) + for _, tv := range tg.Tests { + t.Run(fmt.Sprintf("%s #%d", f, tv.TcId), func(t *testing.T) { + wantPass := shouldPass(tv.Result, tv.Flags, flagsShouldPass) + plaintext, err := rsa.DecryptOAEP(hash.New(), nil, priv.(*rsa.PrivateKey), decodeHex(tv.Ct), decodeHex(tv.Label)) + if wantPass { + if err != nil { + t.Fatalf("comment: %s, expected success: %s", tv.Comment, err) + } + if !bytes.Equal(plaintext, decodeHex(tv.Msg)) { + t.Errorf("comment: %s, unexpected plaintext: got %x, want %s", tv.Comment, plaintext, tv.Msg) + } + } else if err == nil { + t.Errorf("comment: %s, expected failure", tv.Comment) + } + }) + } + } + } +}