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// Copyright 2009 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 rsa

import (
        "bytes"
        "crypto"
        "crypto/rand"
        "crypto/sha1"
        "encoding/base64"
        "encoding/hex"
        "io"
        "math/big"
        "testing"
        "testing/quick"
)

func decodeBase64(in string) []byte {
        out := make([]byte, base64.StdEncoding.DecodedLen(len(in)))
        n, err := base64.StdEncoding.Decode(out, []byte(in))
        if err != nil {
                return nil
        }
        return out[0:n]
}

type DecryptPKCS1v15Test struct {
        in, out string
}

// These test vectors were generated with `openssl rsautl -pkcs -encrypt`
var decryptPKCS1v15Tests = []DecryptPKCS1v15Test{
        {
                "gIcUIoVkD6ATMBk/u/nlCZCCWRKdkfjCgFdo35VpRXLduiKXhNz1XupLLzTXAybEq15juc+EgY5o0DHv/nt3yg==",
                "x",
        },
        {
                "Y7TOCSqofGhkRb+jaVRLzK8xw2cSo1IVES19utzv6hwvx+M8kFsoWQm5DzBeJCZTCVDPkTpavUuEbgp8hnUGDw==",
                "testing.",
        },
        {
                "arReP9DJtEVyV2Dg3dDp4c/PSk1O6lxkoJ8HcFupoRorBZG+7+1fDAwT1olNddFnQMjmkb8vxwmNMoTAT/BFjQ==",
                "testing.\n",
        },
        {
                "WtaBXIoGC54+vH0NH0CHHE+dRDOsMc/6BrfFu2lEqcKL9+uDuWaf+Xj9mrbQCjjZcpQuX733zyok/jsnqe/Ftw==",
                "01234567890123456789012345678901234567890123456789012",
        },
}

func TestDecryptPKCS1v15(t *testing.T) {
        for i, test := range decryptPKCS1v15Tests {
                out, err := DecryptPKCS1v15(nil, rsaPrivateKey, decodeBase64(test.in))
                if err != nil {
                        t.Errorf("#%d error decrypting", i)
                }
                want := []byte(test.out)
                if bytes.Compare(out, want) != 0 {
                        t.Errorf("#%d got:%#v want:%#v", i, out, want)
                }
        }
}

func TestEncryptPKCS1v15(t *testing.T) {
        random := rand.Reader
        k := (rsaPrivateKey.N.BitLen() + 7) / 8

        tryEncryptDecrypt := func(in []byte, blind bool) bool {
                if len(in) > k-11 {
                        in = in[0 : k-11]
                }

                ciphertext, err := EncryptPKCS1v15(random, &rsaPrivateKey.PublicKey, in)
                if err != nil {
                        t.Errorf("error encrypting: %s", err)
                        return false
                }

                var rand io.Reader
                if !blind {
                        rand = nil
                } else {
                        rand = random
                }
                plaintext, err := DecryptPKCS1v15(rand, rsaPrivateKey, ciphertext)
                if err != nil {
                        t.Errorf("error decrypting: %s", err)
                        return false
                }

                if bytes.Compare(plaintext, in) != 0 {
                        t.Errorf("output mismatch: %#v %#v", plaintext, in)
                        return false
                }
                return true
        }

        config := new(quick.Config)
        if testing.Short() {
                config.MaxCount = 10
        }
        quick.Check(tryEncryptDecrypt, config)
}

// These test vectors were generated with `openssl rsautl -pkcs -encrypt`
var decryptPKCS1v15SessionKeyTests = []DecryptPKCS1v15Test{
        {
                "e6ukkae6Gykq0fKzYwULpZehX+UPXYzMoB5mHQUDEiclRbOTqas4Y0E6nwns1BBpdvEJcilhl5zsox/6DtGsYg==",
                "1234",
        },
        {
                "Dtis4uk/q/LQGGqGk97P59K03hkCIVFMEFZRgVWOAAhxgYpCRG0MX2adptt92l67IqMki6iVQyyt0TtX3IdtEw==",
                "FAIL",
        },
        {
                "LIyFyCYCptPxrvTxpol8F3M7ZivlMsf53zs0vHRAv+rDIh2YsHS69ePMoPMe3TkOMZ3NupiL3takPxIs1sK+dw==",
                "abcd",
        },
        {
                "bafnobel46bKy76JzqU/RIVOH0uAYvzUtauKmIidKgM0sMlvobYVAVQPeUQ/oTGjbIZ1v/6Gyi5AO4DtHruGdw==",
                "FAIL",
        },
}

func TestEncryptPKCS1v15SessionKey(t *testing.T) {
        for i, test := range decryptPKCS1v15SessionKeyTests {
                key := []byte("FAIL")
                err := DecryptPKCS1v15SessionKey(nil, rsaPrivateKey, decodeBase64(test.in), key)
                if err != nil {
                        t.Errorf("#%d error decrypting", i)
                }
                want := []byte(test.out)
                if bytes.Compare(key, want) != 0 {
                        t.Errorf("#%d got:%#v want:%#v", i, key, want)
                }
        }
}

func TestNonZeroRandomBytes(t *testing.T) {
        random := rand.Reader

        b := make([]byte, 512)
        err := nonZeroRandomBytes(b, random)
        if err != nil {
                t.Errorf("returned error: %s", err)
        }
        for _, b := range b {
                if b == 0 {
                        t.Errorf("Zero octet found")
                        return
                }
        }
}

type signPKCS1v15Test struct {
        in, out string
}

// These vectors have been tested with
//   `openssl rsautl -verify -inkey pk -in signature | hexdump -C`
var signPKCS1v15Tests = []signPKCS1v15Test{
        {"Test.\n", "a4f3fa6ea93bcdd0c57be020c1193ecbfd6f200a3d95c409769b029578fa0e336ad9a347600e40d3ae823b8c7e6bad88cc07c1d54c3a1523cbbb6d58efc362ae"},
}

func TestSignPKCS1v15(t *testing.T) {
        for i, test := range signPKCS1v15Tests {
                h := sha1.New()
                h.Write([]byte(test.in))
                digest := h.Sum(nil)

                s, err := SignPKCS1v15(nil, rsaPrivateKey, crypto.SHA1, digest)
                if err != nil {
                        t.Errorf("#%d %s", i, err)
                }

                expected, _ := hex.DecodeString(test.out)
                if bytes.Compare(s, expected) != 0 {
                        t.Errorf("#%d got: %x want: %x", i, s, expected)
                }
        }
}

func TestVerifyPKCS1v15(t *testing.T) {
        for i, test := range signPKCS1v15Tests {
                h := sha1.New()
                h.Write([]byte(test.in))
                digest := h.Sum(nil)

                sig, _ := hex.DecodeString(test.out)

                err := VerifyPKCS1v15(&rsaPrivateKey.PublicKey, crypto.SHA1, digest, sig)
                if err != nil {
                        t.Errorf("#%d %s", i, err)
                }
        }
}

// In order to generate new test vectors you'll need the PEM form of this key:
// -----BEGIN RSA PRIVATE KEY-----
// MIIBOgIBAAJBALKZD0nEffqM1ACuak0bijtqE2QrI/KLADv7l3kK3ppMyCuLKoF0
// fd7Ai2KW5ToIwzFofvJcS/STa6HA5gQenRUCAwEAAQJBAIq9amn00aS0h/CrjXqu
// /ThglAXJmZhOMPVn4eiu7/ROixi9sex436MaVeMqSNf7Ex9a8fRNfWss7Sqd9eWu
// RTUCIQDasvGASLqmjeffBNLTXV2A5g4t+kLVCpsEIZAycV5GswIhANEPLmax0ME/
// EO+ZJ79TJKN5yiGBRsv5yvx5UiHxajEXAiAhAol5N4EUyq6I9w1rYdhPMGpLfk7A
// IU2snfRJ6Nq2CQIgFrPsWRCkV+gOYcajD17rEqmuLrdIRexpg8N1DOSXoJ8CIGlS
// tAboUGBxTDq3ZroNism3DaMIbKPyYrAqhKov1h5V
// -----END RSA PRIVATE KEY-----

var rsaPrivateKey = &PrivateKey{
        PublicKey: PublicKey{
                N: fromBase10("9353930466774385905609975137998169297361893554149986716853295022578535724979677252958524466350471210367835187480748268864277464700638583474144061408845077"),
                E: 65537,
        },
        D: fromBase10("7266398431328116344057699379749222532279343923819063639497049039389899328538543087657733766554155839834519529439851673014800261285757759040931985506583861"),
        Primes: []*big.Int{
                fromBase10("98920366548084643601728869055592650835572950932266967461790948584315647051443"),
                fromBase10("94560208308847015747498523884063394671606671904944666360068158221458669711639"),
        },
}