├── .github └── workflows │ └── build.yml ├── .gitignore ├── LICENSE ├── README.md ├── go.mod ├── go.sum ├── index.go └── index.html /.github/workflows/build.yml: -------------------------------------------------------------------------------- 1 | name: build 2 | 3 | permissions: 4 | contents: write 5 | 6 | on: 7 | push: 8 | paths: 9 | - "VERSION" 10 | branches: 11 | - main 12 | workflow_dispatch: 13 | 14 | jobs: 15 | build: 16 | runs-on: ubuntu-24.04 17 | steps: 18 | - uses: actions/checkout@v4 19 | 20 | - name: Setup Go 21 | uses: actions/setup-go@v5 22 | with: 23 | go-version: '>1.22' 24 | check-latest: true 25 | cache: false 26 | 27 | - name: Install dependencies 28 | run: | 29 | go mod download 30 | 31 | - name: Build 32 | run: | 33 | GOOS=js GOARCH=wasm go build -ldflags="-s -w" -o main.wasm index.go 34 | env: 35 | CGO_ENABLED: 0 36 | 37 | - name: Release 38 | uses: softprops/action-gh-release@v2 39 | with: 40 | files: | 41 | main.wasm 42 | tag_name: latest 43 | make_latest: true 44 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # If you prefer the allow list template instead of the deny list, see community template: 2 | # https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore 3 | # 4 | # Binaries for programs and plugins 5 | *.exe 6 | *.exe~ 7 | *.dll 8 | *.so 9 | *.dylib 10 | 11 | # Test binary, built with `go test -c` 12 | *.test 13 | 14 | # Output of the go coverage tool, specifically when used with LiteIDE 15 | *.out 16 | 17 | # Dependency directories (remove the comment below to include it) 18 | # vendor/ 19 | 20 | # Go workspace file 21 | go.work 22 | go.work.sum 23 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | This is the single-file web interface for Picocrypt for offline use. You can save `index.html` anywhere and it will run offline. 2 | 3 | **You will probably want to use https://picocrypt.github.io (https://github.com/Picocrypt/picocrypt.github.io) instead for more safety checks and reliability.** 4 | 5 | # Compiling 6 | To build the web interface from source, you will need to compile the Go code into a WebAssembly file: 7 | ``` 8 | GOOS=js GOARCH=wasm go build -ldflags="-s -w" index.go 9 | ``` 10 | This will create a binary file. Compress it with [LZMA](https://github.com/LZMA-JS/LZMA-JS), encode it in Base64, and paste the final result to [L198](https://github.com/Picocrypt/Web/blob/main/index.html#L198). 11 | 12 | You'll also need to update [`wasm_exec.js`](https://cdn.jsdelivr.net/gh/golang/go@go1.24.0/lib/wasm/wasm_exec.min.js) (replace the Go version accordingly) on [L197](https://github.com/Picocrypt/Web/blob/main/index.html#L197) to glue everything together. 13 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module Picocrypt 2 | 3 | go 1.18 4 | 5 | require ( 6 | github.com/Picocrypt/infectious v0.0.0-20240830233326-3a050f65f9ec 7 | golang.org/x/crypto v0.31.0 8 | ) 9 | 10 | require golang.org/x/sys v0.28.0 // indirect 11 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/Picocrypt/infectious v0.0.0-20240830233326-3a050f65f9ec h1:/cop0/v0HxIJm1XGDgIlzNJ3e4HhM8nIUPZi5RZ/n1w= 2 | github.com/Picocrypt/infectious v0.0.0-20240830233326-3a050f65f9ec/go.mod h1:aaFq/WMVxrU2Exl/tXbTFSXajZrqw0mgn/wi42n0fK4= 3 | golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U= 4 | golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk= 5 | golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA= 6 | golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA= 7 | -------------------------------------------------------------------------------- /index.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | /* 4 | 5 | Picocrypt v1.43 (WebAssembly Version) 6 | Copyright (c) Evan Su 7 | Released under a GNU GPL v3 License 8 | https://github.com/Picocrypt/Web 9 | 10 | ~ In cryptography we trust ~ 11 | 12 | */ 13 | 14 | import ( 15 | "bytes" 16 | "crypto/rand" 17 | "strconv" 18 | "strings" 19 | "syscall/js" 20 | 21 | "github.com/Picocrypt/infectious" 22 | "golang.org/x/crypto/argon2" 23 | "golang.org/x/crypto/blake2b" 24 | "golang.org/x/crypto/chacha20" 25 | "golang.org/x/crypto/hkdf" 26 | "golang.org/x/crypto/sha3" 27 | ) 28 | 29 | var MiB = 1 << 20 30 | var GiB = 1 << 30 31 | var rs5, _ = infectious.NewFEC(5, 15) 32 | var rs16, _ = infectious.NewFEC(16, 48) 33 | var rs24, _ = infectious.NewFEC(24, 72) 34 | var rs32, _ = infectious.NewFEC(32, 96) 35 | var rs64, _ = infectious.NewFEC(64, 192) 36 | var password string 37 | 38 | func work(din []byte, mode string) []byte { 39 | var salt []byte 40 | var hkdfSalt []byte 41 | var nonce []byte 42 | var keyHash []byte 43 | var keyHashRef []byte 44 | var authTag []byte 45 | var dout []byte 46 | 47 | if mode == "encrypt" { 48 | salt = make([]byte, 16) 49 | hkdfSalt = make([]byte, 32) 50 | nonce = make([]byte, 24) 51 | if _, err := rand.Read(salt); err != nil { 52 | return []byte{5} 53 | } 54 | if _, err := rand.Read(hkdfSalt); err != nil { 55 | return []byte{5} 56 | } 57 | if _, err := rand.Read(nonce); err != nil { 58 | return []byte{5} 59 | } 60 | dout = append(dout, rsEncode(rs5, []byte("v1.43"))...) 61 | dout = append(dout, rsEncode(rs5, []byte("00000"))...) 62 | dout = append(dout, rsEncode(rs5, make([]byte, 5))...) 63 | dout = append(dout, rsEncode(rs16, salt)...) 64 | dout = append(dout, rsEncode(rs32, hkdfSalt)...) 65 | dout = append(dout, rsEncode(rs16, make([]byte, 16))...) 66 | dout = append(dout, rsEncode(rs24, nonce)...) 67 | dout = append(dout, make([]byte, 480)...) 68 | } else { 69 | errs, tmp := make([]error, 7), make([]byte, 15) 70 | tmp, din = din[15:30], din[30:] 71 | tmp, errs[0] = rsDecode(rs5, tmp) 72 | c, _ := strconv.Atoi(string(tmp)) 73 | tmp, din = din[c*3:c*3+15], din[c*3+15:] 74 | tmp, errs[1] = rsDecode(rs5, tmp) 75 | if tmp[0]+tmp[1]+tmp[3] > 0 { 76 | return []byte{1} 77 | } 78 | salt, din = din[:48], din[48:] 79 | salt, errs[2] = rsDecode(rs16, salt) 80 | hkdfSalt, din = din[:96], din[96:] 81 | hkdfSalt, errs[3] = rsDecode(rs32, hkdfSalt) 82 | nonce, din = din[48:120], din[120:] 83 | nonce, errs[4] = rsDecode(rs24, nonce) 84 | keyHashRef, din = din[:192], din[192:] 85 | keyHashRef, errs[5] = rsDecode(rs64, keyHashRef) 86 | authTag, din = din[96:288], din[288:] 87 | authTag, errs[6] = rsDecode(rs64, authTag) 88 | for _, err := range errs { 89 | if err != nil { 90 | return []byte{2} 91 | } 92 | } 93 | } 94 | 95 | key := argon2.IDKey([]byte(password), salt, 4, 1<<20, 4, 32) 96 | tmp := sha3.New512() 97 | tmp.Write(key) 98 | keyHash = tmp.Sum(nil) 99 | if mode == "decrypt" && !bytes.Equal(keyHash, keyHashRef) { 100 | return []byte{3} 101 | } 102 | 103 | counter := 0 104 | chacha, _ := chacha20.NewUnauthenticatedCipher(key, nonce) 105 | subkey := make([]byte, 32) 106 | hkdf := hkdf.New(sha3.New256, key, hkdfSalt, nil) 107 | hkdf.Read(subkey) 108 | mac, _ := blake2b.New512(subkey) 109 | hkdf.Read(make([]byte, 32)) 110 | 111 | for { 112 | var src []byte 113 | if len(din) == 0 { 114 | break 115 | } else if len(din) < MiB { 116 | src, din = din, nil 117 | } else { 118 | src, din = din[:MiB], din[MiB:] 119 | } 120 | dst := make([]byte, len(src)) 121 | 122 | if mode == "encrypt" { 123 | chacha.XORKeyStream(dst, src) 124 | mac.Write(dst) 125 | } else { 126 | mac.Write(src) 127 | chacha.XORKeyStream(dst, src) 128 | } 129 | dout = append(dout, dst...) 130 | 131 | counter += MiB 132 | if counter >= 60*GiB { 133 | nonce = make([]byte, 24) 134 | hkdf.Read(nonce) 135 | chacha, _ = chacha20.NewUnauthenticatedCipher(key, nonce) 136 | hkdf.Read(make([]byte, 16)) 137 | counter = 0 138 | } 139 | } 140 | 141 | if mode == "encrypt" { 142 | buff := rsEncode(rs64, keyHash) 143 | buff = append(buff, rsEncode(rs32, make([]byte, 32))...) 144 | buff = append(buff, rsEncode(rs64, mac.Sum(nil))...) 145 | for i, v := range buff { 146 | dout[309+i] = v 147 | } 148 | } else { 149 | if !bytes.Equal(mac.Sum(nil), authTag) { 150 | return []byte{4} 151 | } 152 | } 153 | 154 | return append([]byte{0}, dout...) 155 | } 156 | 157 | func rsEncode(rs *infectious.FEC, data []byte) []byte { 158 | res := make([]byte, rs.Total()) 159 | rs.Encode(data, func(s infectious.Share) { 160 | res[s.Number] = s.Data[0] 161 | }) 162 | return res 163 | } 164 | 165 | func rsDecode(rs *infectious.FEC, data []byte) ([]byte, error) { 166 | tmp := make([]infectious.Share, rs.Total()) 167 | for i := 0; i < rs.Total(); i++ { 168 | tmp[i].Number = i 169 | tmp[i].Data = []byte{data[i]} 170 | } 171 | res, err := rs.Decode(nil, tmp) 172 | if err != nil { 173 | return data[:rs.Total()/3], err 174 | } 175 | return res, nil 176 | } 177 | 178 | func main() { 179 | quit := make(chan struct{}, 0) 180 | document := js.Global().Get("document") 181 | input := document.Call("getElementById", "fin") 182 | button := document.Call("getElementById", "work") 183 | callback := js.FuncOf(func(v js.Value, x []js.Value) any { 184 | var dout []byte 185 | data := js.Global().Get("Uint8Array").New(x[0]) 186 | din := make([]byte, data.Get("length").Int()) 187 | js.CopyBytesToGo(din, data) 188 | password = document.Call("getElementById", "password").Get("value").String() 189 | filename := input.Get("files").Call("item", 0).Get("name").String() 190 | if strings.HasSuffix(filename, ".pcv") { 191 | dout = work(din, "decrypt") 192 | } else { 193 | dout = work(din, "encrypt") 194 | } 195 | arr := js.Global().Get("Uint8Array").New(len(dout)) 196 | js.CopyBytesToJS(arr, dout) 197 | js.Global().Call("download", arr) 198 | return nil 199 | }) 200 | button.Set("onclick", js.FuncOf(func(v js.Value, x []js.Value) any { 201 | input.Get("files").Call("item", 0).Call("arrayBuffer").Call("then", callback) 202 | return nil 203 | })) 204 | <-quit 205 | } 206 | --------------------------------------------------------------------------------