├── .github ├── dependabot.yml └── workflows │ ├── generated-pr.yml │ ├── maven.yml │ └── stale.yml ├── .gitignore ├── LICENSE ├── README.md ├── jitpack.yml ├── pom.xml └── src ├── main └── java │ └── io │ └── ipfs │ └── multihash │ └── Multihash.java └── test └── java └── io └── ipfs └── multihash └── MultihashTest.java /.github/dependabot.yml: -------------------------------------------------------------------------------- 1 | version: 2 2 | updates: 3 | - package-ecosystem: "github-actions" 4 | directory: "/" 5 | schedule: 6 | interval: "weekly" 7 | -------------------------------------------------------------------------------- /.github/workflows/generated-pr.yml: -------------------------------------------------------------------------------- 1 | name: Close Generated PRs 2 | 3 | on: 4 | schedule: 5 | - cron: '0 0 * * *' 6 | workflow_dispatch: 7 | 8 | permissions: 9 | issues: write 10 | pull-requests: write 11 | 12 | jobs: 13 | stale: 14 | uses: ipdxco/unified-github-workflows/.github/workflows/reusable-generated-pr.yml@v1 15 | -------------------------------------------------------------------------------- /.github/workflows/maven.yml: -------------------------------------------------------------------------------- 1 | name: Java CI 2 | 3 | on: [push] 4 | 5 | jobs: 6 | build: 7 | 8 | runs-on: ubuntu-latest 9 | 10 | steps: 11 | - uses: actions/checkout@v4 12 | - name: Set up JDK 11 13 | uses: actions/setup-java@v4 14 | with: 15 | distribution: temurin 16 | java-version: 11 17 | - name: Build with Maven 18 | run: mvn -B test-compile 19 | - name: Run tests with Maven 20 | timeout-minutes: 10 21 | run: mvn -B test 22 | -------------------------------------------------------------------------------- /.github/workflows/stale.yml: -------------------------------------------------------------------------------- 1 | name: Close Stale Issues 2 | 3 | on: 4 | schedule: 5 | - cron: '0 0 * * *' 6 | workflow_dispatch: 7 | 8 | permissions: 9 | issues: write 10 | pull-requests: write 11 | 12 | jobs: 13 | stale: 14 | uses: ipdxco/unified-github-workflows/.github/workflows/reusable-stale-issue.yml@v1 15 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .classpath 2 | .project 3 | .settings 4 | *.class 5 | 6 | target/** 7 | build/** 8 | dist/** 9 | .idea/** 10 | 11 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 12 | hs_err_pid* 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2015 Ian Preston 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # java-multihash 2 | 3 | [![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io) 4 | [![](https://img.shields.io/badge/project-multiformats-blue.svg?style=flat-square)](https://github.com/multiformats/multiformats) 5 | [![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23ipfs) 6 | [![Travis CI](https://img.shields.io/travis/multiformats/java-multihash.svg?style=flat-square&branch=master)](https://travis-ci.org/multiformats/java-multihash) 7 | [![Release](https://jitpack.io/v/multiformats/java-multihash.svg)](https://jitpack.io/#multiformats/java-multihash) 8 | [![](https://img.shields.io/badge/readme%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme) 9 | 10 | > A Java implementation of [multihash](https://github.com/multiformats/multihash). 11 | 12 | ## Install 13 | 14 | Simply clone this repository. 15 | 16 | ## Usage 17 | 18 | ```java 19 | Multihash b58 = Multihash.decode("QmatmE9msSfkKxoffpHwNLNKgwZG8eT9Bud6YoPab52vpy"); 20 | Multihash b36 = Multihash.decode("kmue2y4illvr0m3lt8x6z8iwghtxlzdmkjh957p5rr5cdr9243ugc"); 21 | ``` 22 | 23 | Note that this library only decodes & encodes Multihashes, and does not actually include any implementations of the hash functions themselves. 24 | 25 | Consumers of this library can use different implementations for different reasons. Here are a few possible implementation choices for each `Multihash.Type`: 26 | 27 | * [JDK's `MessageDigest`](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/security/MessageDigest.html) supports (at least) these: 28 | * md5 = MD5 29 | * sha1 = SHA-1 30 | * sha2-224 = SHA-224 31 | * sha2-256 = SHA-256 32 | * sha2-384 = SHA-384 33 | * sha2-512 = SHA-512 34 | * sha2-512-224 = SHA-512/224 35 | * sha2-512-256 = SHA-512/256 36 | * sha3_224 = SHA3-224 37 | * sha3_256 = SHA3-256 38 | * sha3_512 = SHA3-512 39 | * [Google Guava's Hashing](https://github.com/google/guava/wiki/hashingexplained) offers [intentionally only](https://github.com/google/guava/issues/5990#issuecomment-2571350434) these: 40 | * md5 = `@Deprecated Hashing.md5()` 41 | * sha1 = `@Deprecated Hashing.sha1()` 42 | * sha2_256 = `Hashing.sha256()` 43 | * sha2_512 = `Hashing.sha512()` 44 | * murmur3 = `Hashing.murmur3_32_fixed()` 45 | * [Google Tink](https://developers.google.com/tink/supported-key-types#mac) 46 | * AES-CMAC, see [Multicodec Issue #368](https://github.com/multiformats/multicodec/issues/368) 47 | * [BouncyCastle](https://www.bouncycastle.org/documentation/specification_interoperability/) 48 | * blake2* 49 | * blake3* 50 | * shake-* 51 | * ripemd-* 52 | * [Apache Commons Codec](https://commons.apache.org/proper/commons-codec/) 53 | * blake3* 54 | * murmur3 55 | * [Jacksum](https://github.com/jonelo/jacksum) 56 | * skein* 57 | * ... 58 | 59 | Please contribute an update to this list if you know of any other related libraries. 60 | 61 | ## Dependency 62 | 63 | You can use this project by building the JAR file as specified below, or by using [JitPack](https://jitpack.io/#multiformats/java-multihash/) (also supporting Gradle, SBT, etc). 64 | 65 | for Maven, you can add the follwing sections to your POM.XML: 66 | 67 | ```xml 68 | 69 | 70 | jitpack.io 71 | https://jitpack.io 72 | 73 | 74 | 75 | 76 | 77 | com.github.multiformats 78 | java-multihash 79 | $LATEST_VERSION 80 | 81 | 82 | ``` 83 | 84 | ## Testing 85 | 86 | `mvn test` 87 | 88 | ## Building 89 | 90 | `mvn package` will build a JAR file with Maven dependency information. 91 | 92 | ## Releasing 93 | 94 | The version number is specified in the `pom.xml` file and must be changed in order to be accurately reflected in the JAR file manifest. A git tag must be added in the format "vx.x.x" for JitPack to work. 95 | 96 | ## Maintainers 97 | 98 | Captain: [@ianopolous](https://github.com/ianopolous). 99 | 100 | ## Contribute 101 | 102 | Contributions welcome. Please check out [the issues](https://github.com/multiformats/java-multihash/issues). 103 | 104 | Check out our [contributing document](https://github.com/multiformats/multiformats/blob/master/contributing.md) for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md). 105 | 106 | Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification. 107 | 108 | ## License 109 | 110 | [MIT](LICENSE) © 2015 Ian Preston 111 | -------------------------------------------------------------------------------- /jitpack.yml: -------------------------------------------------------------------------------- 1 | before_install: 2 | - sdk install java 21-tem 3 | - sdk use java 21-tem 4 | - sdk install maven 5 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 3 | 4.0.0 4 | 5 | com.github.multiformats 6 | java-multihash 7 | 1.3.5 8 | jar 9 | 10 | multihash 11 | https://github.com/multiformats/java-multihash 12 | 13 | 14 | https://github.com/multiformats/java-multihash/issues 15 | GitHub Issues 16 | 17 | 18 | 19 | https://github.com/multiformats/java-multihash 20 | scm:git:git://github.com/multiformats/java-multihash.git 21 | scm:git:git@github.com:multiformats/java-multihash.git 22 | 23 | 24 | 25 | 26 | MIT License 27 | https://github.com/multiformats/java-multiaddr/blob/master/LICENSE 28 | repo 29 | 30 | 31 | 32 | 33 | UTF-8 34 | UTF-8 35 | 5.11.0 36 | 3.0 37 | v1.1.1 38 | 39 | 40 | 41 | 42 | jitpack.io 43 | https://jitpack.io 44 | 45 | 46 | 47 | 48 | 49 | com.github.multiformats 50 | java-multibase 51 | ${version.multibase} 52 | 53 | 54 | org.junit.jupiter 55 | junit-jupiter 56 | ${version.junit} 57 | test 58 | 59 | 60 | org.hamcrest 61 | hamcrest-core 62 | ${version.hamcrest} 63 | test 64 | 65 | 66 | 67 | 68 | 69 | 70 | org.apache.maven.plugins 71 | maven-compiler-plugin 72 | 3.1 73 | 74 | 11 75 | 11 76 | 77 | 78 | 79 | org.apache.maven.plugins 80 | maven-surefire-plugin 81 | 3.3.1 82 | 83 | 84 | org.apache.maven.plugins 85 | maven-jar-plugin 86 | 3.0.2 87 | 88 | 89 | 90 | true 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | -------------------------------------------------------------------------------- /src/main/java/io/ipfs/multihash/Multihash.java: -------------------------------------------------------------------------------- 1 | package io.ipfs.multihash; 2 | 3 | import io.ipfs.multibase.*; 4 | 5 | import java.io.*; 6 | import java.util.Arrays; 7 | import java.util.HashMap; 8 | import java.util.Map; 9 | 10 | public class Multihash { 11 | public static final int MAX_IDENTITY_HASH_LENGTH = 1024*1024; 12 | 13 | // From https://github.com/multiformats/multicodec/blob/master/table.csv 14 | public enum Type { 15 | id(0, -1), 16 | md5(0xd5, 16), 17 | sha1(0x11, 20), 18 | sha2_256(0x12, 32), 19 | sha2_512(0x13, 64), 20 | dbl_sha2_256(0x56, 32), 21 | sha3_224(0x17, 24), 22 | sha3_256(0x16, 32), 23 | sha3_512(0x14, 64), 24 | shake_128(0x18, 32), 25 | shake_256(0x19, 64), 26 | keccak_224(0x1a, 24), 27 | keccak_256(0x1b, 32), 28 | keccak_384(0x1c, 48), 29 | keccak_512(0x1d, 64), 30 | murmur3(0x22, 4), 31 | 32 | // blake2b (64 codes) 33 | blake2b_8(0xb201, 1), 34 | blake2b_16(0xb202, 2), 35 | blake2b_24(0xb203, 3), 36 | blake2b_32(0xb204, 4), 37 | blake2b_40(0xb205, 5), 38 | blake2b_48(0xb206, 6), 39 | blake2b_56(0xb207, 7), 40 | blake2b_64(0xb208, 8), 41 | blake2b_72(0xb209, 9), 42 | blake2b_80(0xb20a, 10), 43 | blake2b_88(0xb20b, 11), 44 | blake2b_96(0xb20c, 12), 45 | blake2b_104(0xb20d, 13), 46 | blake2b_112(0xb20e, 14), 47 | blake2b_120(0xb20f, 15), 48 | blake2b_128(0xb210, 16), 49 | blake2b_136(0xb211, 17), 50 | blake2b_144(0xb212, 18), 51 | blake2b_152(0xb213, 19), 52 | blake2b_160(0xb214, 20), 53 | blake2b_168(0xb215, 21), 54 | blake2b_176(0xb216, 22), 55 | blake2b_184(0xb217, 23), 56 | blake2b_192(0xb218, 24), 57 | blake2b_200(0xb219, 25), 58 | blake2b_208(0xb21a, 26), 59 | blake2b_216(0xb21b, 27), 60 | blake2b_224(0xb21c, 28), 61 | blake2b_232(0xb21d, 29), 62 | blake2b_240(0xb21e, 30), 63 | blake2b_248(0xb21f, 31), 64 | blake2b_256(0xb220, 32), 65 | blake2b_264(0xb221, 33), 66 | blake2b_272(0xb222, 34), 67 | blake2b_280(0xb223, 35), 68 | blake2b_288(0xb224, 36), 69 | blake2b_296(0xb225, 37), 70 | blake2b_304(0xb226, 38), 71 | blake2b_312(0xb227, 39), 72 | blake2b_320(0xb228, 40), 73 | blake2b_328(0xb229, 41), 74 | blake2b_336(0xb22a, 42), 75 | blake2b_344(0xb22b, 43), 76 | blake2b_352(0xb22c, 44), 77 | blake2b_360(0xb22d, 45), 78 | blake2b_368(0xb22e, 46), 79 | blake2b_376(0xb22f, 47), 80 | blake2b_384(0xb230, 48), 81 | blake2b_392(0xb231, 49), 82 | blake2b_400(0xb232, 50), 83 | blake2b_408(0xb233, 51), 84 | blake2b_416(0xb234, 52), 85 | blake2b_424(0xb235, 53), 86 | blake2b_432(0xb236, 54), 87 | blake2b_440(0xb237, 55), 88 | blake2b_448(0xb238, 56), 89 | blake2b_456(0xb239, 57), 90 | blake2b_464(0xb23a, 58), 91 | blake2b_472(0xb23b, 59), 92 | blake2b_480(0xb23c, 60), 93 | blake2b_488(0xb23d, 61), 94 | blake2b_496(0xb23e, 62), 95 | blake2b_504(0xb23f, 63), 96 | blake2b_512(0xb240, 64), 97 | 98 | // blake2s (32 codes) 99 | blake2s_8(0xb241, 1), 100 | blake2s_16(0xb242, 2), 101 | blake2s_24(0xb243, 3), 102 | blake2s_32(0xb244, 4), 103 | blake2s_40(0xb245, 5), 104 | blake2s_48(0xb246, 6), 105 | blake2s_56(0xb247, 7), 106 | blake2s_64(0xb248, 8), 107 | blake2s_72(0xb249, 9), 108 | blake2s_80(0xb24a, 10), 109 | blake2s_88(0xb24b, 11), 110 | blake2s_96(0xb24c, 12), 111 | blake2s_104(0xb24d, 13), 112 | blake2s_112(0xb24e, 14), 113 | blake2s_120(0xb24f, 15), 114 | blake2s_128(0xb250, 16), 115 | blake2s_136(0xb251, 17), 116 | blake2s_144(0xb252, 18), 117 | blake2s_152(0xb253, 19), 118 | blake2s_160(0xb254, 20), 119 | blake2s_168(0xb255, 21), 120 | blake2s_176(0xb256, 22), 121 | blake2s_184(0xb257, 23), 122 | blake2s_192(0xb258, 24), 123 | blake2s_200(0xb259, 25), 124 | blake2s_208(0xb25a, 26), 125 | blake2s_216(0xb25b, 27), 126 | blake2s_224(0xb25c, 28), 127 | blake2s_232(0xb25d, 29), 128 | blake2s_240(0xb25e, 30), 129 | blake2s_248(0xb25f, 31), 130 | blake2s_256(0xb260, 32), 131 | 132 | // Murmur 133 | murmur3_x64_64(0x22, 8), 134 | murmur3_x64_128(0x1022, 16); // DRAFT status 135 | 136 | public final int index, length; 137 | 138 | Type(final int index, final int length) { 139 | this.index = index; 140 | this.length = length; 141 | } 142 | 143 | private static Map lookup = new HashMap<>(); 144 | static { 145 | for (Type t: Type.values()) 146 | lookup.put(t.index, t); 147 | } 148 | 149 | public static Type lookup(int t) { 150 | Type type = lookup.get(t); 151 | if (type == null) 152 | throw new IllegalStateException(String.format("Unknown Multihash type: 0x%x", t)); 153 | return type; 154 | } 155 | 156 | } 157 | 158 | private final Type type; 159 | private final byte[] hash; 160 | 161 | public Multihash(Type type, byte[] hash) { 162 | if (hash.length > 127 && type != Type.id) 163 | throw new IllegalStateException("Unsupported hash size: "+hash.length); 164 | if (hash.length > MAX_IDENTITY_HASH_LENGTH) 165 | throw new IllegalStateException("Unsupported hash size: "+hash.length); 166 | if (hash.length != type.length && type != Type.id) 167 | throw new IllegalStateException("Incorrect hash length: " + hash.length + " != "+type.length); 168 | this.type = type; 169 | this.hash = hash; 170 | } 171 | 172 | public Multihash(Multihash toClone) { 173 | this(toClone.type, toClone.hash); // N.B. despite being a byte[], hash is immutable 174 | } 175 | 176 | public byte[] toBytes() { 177 | try { 178 | ByteArrayOutputStream res = new ByteArrayOutputStream(); 179 | putUvarint(res, type.index); 180 | putUvarint(res, hash.length); 181 | res.write(hash); 182 | return res.toByteArray(); 183 | } catch (IOException e) { 184 | throw new RuntimeException(e); 185 | } 186 | } 187 | 188 | public Type getType() { 189 | return type; 190 | } 191 | 192 | public byte[] getHash() { 193 | return Arrays.copyOf(hash, hash.length); 194 | } 195 | 196 | public void serialize(OutputStream out) { 197 | try { 198 | putUvarint(out, type.index); 199 | putUvarint(out, hash.length); 200 | out.write(hash); 201 | } catch (IOException e) { 202 | throw new RuntimeException(e); 203 | } 204 | } 205 | 206 | public Multihash bareMultihash() { 207 | return this; 208 | } 209 | 210 | public static Multihash deserialize(InputStream din) throws IOException { 211 | int type = (int)readVarint(din); 212 | int len = (int)readVarint(din); 213 | Type t = Type.lookup(type); 214 | byte[] hash = new byte[len]; 215 | int total = 0; 216 | while (total < len) { 217 | int read = din.read(hash); 218 | if (read < 0) 219 | throw new EOFException(); 220 | else 221 | total += read; 222 | } 223 | return new Multihash(t, hash); 224 | } 225 | 226 | public static Multihash deserialize(byte[] raw) { 227 | try { 228 | return deserialize(new ByteArrayInputStream(raw)); 229 | } catch (IOException e) { 230 | throw new RuntimeException(e); 231 | } 232 | } 233 | 234 | /** 235 | * 236 | * @param encoded A multibase encoded serialization of a Multihash 237 | * @return 238 | * @throws IOException 239 | */ 240 | public static Multihash decode(String encoded) { 241 | if (encoded.length() == 46 && encoded.startsWith("Qm")) 242 | return deserialize(Base58.decode(encoded)); 243 | return deserialize(Multibase.decode(encoded)); 244 | } 245 | 246 | @Override 247 | public String toString() { 248 | return toBase58(); 249 | } 250 | 251 | @Override 252 | public boolean equals(Object o) { 253 | if (!(o instanceof Multihash)) 254 | return false; 255 | return type == ((Multihash) o).type && Arrays.equals(hash, ((Multihash) o).hash); 256 | } 257 | 258 | @Override 259 | public int hashCode() { 260 | return Arrays.hashCode(hash) ^ type.hashCode(); 261 | } 262 | 263 | public String toHex() { 264 | return Base16.encode(toBytes()); 265 | } 266 | 267 | public String toBase58() { 268 | return Base58.encode(toBytes()); 269 | } 270 | 271 | public static Multihash fromHex(String hex) { 272 | if (hex.length() % 2 != 0) 273 | throw new IllegalStateException("Odd number of hex digits!"); 274 | 275 | try (ByteArrayOutputStream bout = new ByteArrayOutputStream()) { 276 | for (int i = 0; i < hex.length() - 1; i += 2) 277 | bout.write(Integer.valueOf(hex.substring(i, i + 2), 16)); 278 | return Multihash.deserialize(bout.toByteArray()); 279 | } catch (IOException e) { 280 | throw new IllegalStateException("Unable to handle Multihash conversion to Hex properly"); 281 | } 282 | } 283 | 284 | public static Multihash fromBase58(String base58) { 285 | return Multihash.deserialize(Base58.decode(base58)); 286 | } 287 | 288 | public static long readVarint(InputStream in) throws IOException { 289 | long x = 0; 290 | int s=0; 291 | for (int i=0; i < 10; i++) { 292 | int b = in.read(); 293 | if (b < 0x80) { 294 | if (i == 9 && b > 1) { 295 | throw new IllegalStateException("Overflow reading varint!"); 296 | } 297 | return x | (((long)b) << s); 298 | } 299 | x |= ((long)b & 0x7f) << s; 300 | s += 7; 301 | } 302 | throw new IllegalStateException("Varint too long!"); 303 | } 304 | 305 | public static void putUvarint(OutputStream out, long x) throws IOException { 306 | while (x >= 0x80) { 307 | out.write((byte)(x | 0x80)); 308 | x >>= 7; 309 | } 310 | out.write((byte)x); 311 | } 312 | } 313 | -------------------------------------------------------------------------------- /src/test/java/io/ipfs/multihash/MultihashTest.java: -------------------------------------------------------------------------------- 1 | package io.ipfs.multihash; 2 | 3 | import io.ipfs.multibase.*; 4 | import org.junit.jupiter.api.Test; 5 | 6 | import java.io.*; 7 | import java.security.MessageDigest; 8 | import java.util.Arrays; 9 | import java.util.List; 10 | 11 | import static org.junit.jupiter.api.Assertions.*; 12 | 13 | class MultihashTest { 14 | 15 | @Test 16 | void base58Test() { 17 | List examples = Arrays.asList("QmPZ9gcCEpqKTo6aq61g2nXGUhM4iCL3ewB6LDXZCtioEB", 18 | "QmatmE9msSfkKxoffpHwNLNKgwZG8eT9Bud6YoPab52vpy"); 19 | for (String example: examples) { 20 | byte[] output = Base58.decode(example); 21 | String encoded = Base58.encode(output); 22 | assertEquals(example, encoded); 23 | } 24 | } 25 | 26 | @Test 27 | void decodeTest() throws IOException { 28 | List base58 = Arrays.asList( 29 | "QmPZ9gcCEpqKTo6aq61g2nXGUhM4iCL3ewB6LDXZCtioEB", 30 | "QmatmE9msSfkKxoffpHwNLNKgwZG8eT9Bud6YoPab52vpy" 31 | ); 32 | List base36 = Arrays.asList( 33 | "kmue2y4illvr0m3lt8x6z8iwghtxlzdmkjh957p5rr5cdr9243ugc", 34 | "kmuia3qyasz2z5cnz848bag5n5wfc7gzi35cz2npamtmkyifd5anu"); 35 | for (int i=0; i < base58.size(); i++) { 36 | Multihash b58 = Multihash.decode(base58.get(i)); 37 | Multihash b36 = Multihash.decode(base36.get(i)); 38 | assertEquals(b58, b36); 39 | } 40 | } 41 | 42 | @Test 43 | void multihashTest() { 44 | Object[][] examples = new Object[][]{ 45 | {Multihash.Type.id, "ID", "13hC12xCn", "hello"}, 46 | {Multihash.Type.id, "ID", "11", ""}, 47 | {Multihash.Type.md5, "MD5", "fzhnUYo18W8ewDBzLuzLqc9Twp", "hello world"}, 48 | {Multihash.Type.sha1, "SHA-1", "5drNu81uhrFLRiS4bxWgAkpydaLUPW", "hello world"}, 49 | {Multihash.Type.sha2_256, "SHA-256", "QmaozNR7DZHQK1ZcU9p7QdrshMvXqWK6gpu5rmrkPdT3L4", "hello world"}, 50 | {Multihash.Type.sha2_512, "SHA-512", "8Vtkv2tdQ43bNGdWN9vNx9GVS9wrbXHk4ZW8kmucPmaYJwwedXir52kti9wJhcik4HehyqgLrQ1hBuirviLhxgRBNv", "hello world"}, 51 | {Multihash.Type.sha3_512, "SHA3-512", "8tWhXW5oUwtPd9d3FnjuLP1NozN3vc45rmsoWEEfrZL1L6gi9dqi1YkZu5iHb2HJ8WbZaaKAyNWWRAa8yaxMkGKJmX", "hello world"} 52 | }; 53 | 54 | for(Object[] ex: examples) { 55 | try { 56 | byte[] digest; 57 | if (ex[0] != Multihash.Type.id) { 58 | MessageDigest md = MessageDigest.getInstance((String) ex[1]); 59 | assertNotNull(md); 60 | md.update(((String) ex[3]).getBytes("UTF-8")); 61 | digest = md.digest(); 62 | } else 63 | digest = ((String) ex[3]).getBytes("UTF-8"); 64 | // Test constructor 65 | Multihash m2 = new Multihash((Multihash.Type)ex[0], digest); 66 | Multihash m = Multihash.fromBase58((String)ex[2]); 67 | // Test comparison 68 | assertEquals(m, m2); 69 | // Test conversions 70 | assertEquals(m.toBase58(), m2.toBase58()); 71 | assertEquals(m.toBase58(), ex[2]); 72 | // Test fromHex and toHex 73 | Multihash m3 = Multihash.fromHex(m.toHex()); 74 | assertEquals(m, m3); 75 | } 76 | catch (Exception e){ 77 | System.out.println(e.getMessage()); 78 | assertTrue(false); 79 | } 80 | } 81 | } 82 | 83 | } 84 | --------------------------------------------------------------------------------