xrpl4j：纯Java XRP工具包

# xrpl4j-keypairs [](https://javadoc.io/doc/org.xrpl/xrpl4j-keypairs) Library for generating secure random seeds, deriving public/private keypairs, and signing messages and verifying signatures. This library supports both [ECDSA using the secp256k1 elliptic curve and EdDSA using the Ed25519 elliptic curve](https://xrpl.org/cryptographic-keys.html#signing-algorithms). ## Installation Use this module in your project by adding the following to your `pom.xml`: ``` <dependency> <groupId>org.xrpl</groupId> <artifactId>xrpl4j-keypairs</artifactId> <version>1.0.0</version> </dependency> ``` ## Usage The [`DefaultWalletFactory`](./src/main/java/org/xrpl/xrpl4j/wallet/DefaultWalletFactory.java) class can be used to generate a random wallet, or to restore a wallet from a seed or a key pair. `DefaultWalletFactory` uses a [`DefaultKeyPairService`](./src/main/java/org/xrpl/xrpl4j/keypairs/DefaultKeyPairService.java), which can also be used on its own, to generate seeds and derive keypairs and addresses. ### DefaultWalletFactory The `DefaultWalletFactory` can generate new wallets and restore existing wallets. The following code generates a new testnet wallet with an ED25519 public/private keypair: ```java WalletFactory walletFactory = DefaultWalletFactory.getInstance(); SeedWalletGenerationResult seedWalletGenerationResult = walletFactory.randomWallet(true); System.out.println("Generation result: " + seedWalletGenerationResult); ``` Which produces the following output: ``` Generation result: SeedWalletGenerationResult{ seed=sEdSbPbSNZHqH1r1d27Sp3mh8Rq3oyu, wallet=Wallet{ privateKey=ED9000C29279778F95F807B3F3320E4F8DC9B08067E4F3A4CBE587F88CDB20AEBE, publicKey=ED26F7054744A45706A6D138A32429111DCB090C0CBECE3853A59693657F7AB63A, classicAddress=rKdYoCQbvNz12ELDVmiJcWUADZ1Lg2o9w1, xAddress=TVR8ETfqXp1isjemD7wQCHguktJWAn8HhqpwCVThmUSVPPk, isTest=true } } ``` Alternatively, you can restore a wallet from a seed: ```java WalletFactory walletFactory = DefaultWalletFactory.getInstance(); Wallet wallet = walletFactory.fromSeed("sEdSbPbSNZHqH1r1d27Sp3mh8Rq3oyu", true); System.out.println("Wallet: " + wallet); ``` or from a `KeyPair`: ```java WalletFactory walletFactory = DefaultWalletFactory.getInstance(); Wallet wallet = walletFactory.fromKeyPair(KeyPair.builder() .privateKey("ED9000C29279778F95F807B3F3320E4F8DC9B08067E4F3A4CBE587F88CDB20AEBE") .publicKey("ED26F7054744A45706A6D138A32429111DCB090C0CBECE3853A59693657F7AB63A") .build(), true); System.out.println("Wallet: " + wallet); ``` which both produce the following output: ``` Wallet: Wallet{ privateKey=ED9000C29279778F95F807B3F3320E4F8DC9B08067E4F3A4CBE587F88CDB20AEBE, publicKey=ED26F7054744A45706A6D138A32429111DCB090C0CBECE3853A59693657F7AB63A, classicAddress=rKdYoCQbvNz12ELDVmiJcWUADZ1Lg2o9w1, xAddress=TVR8ETfqXp1isjemD7wQCHguktJWAn8HhqpwCVThmUSVPPk, isTest=true } ``` For full API documentation, check out the [`DefaultWalletFactory` Javadoc](https://www.javadoc.io/doc/org.xrpl/xrpl4j-keypairs/latest/org/xrpl/xrpl4j/wallet/DefaultWalletFactory.html). ### DefaultKeyPairService `DefaultWalletFactory` uses an instance of `DefaultKeyPairService`, which is responsible for generating seeds, deriving `KeyPair`s from seeds, signing messages, and verifying message signatures. The following code generates a seed, derives a `KeyPair` from the seed, signs a message with that `KeyPair`, and finally verifies the signature: ```java KeyPairService keyPairService = DefaultKeyPairService.getInstance(); String seed = keyPairService.generateSeed(); System.out.println("Generated seed: " + seed); KeyPair keyPair = keyPairService.deriveKeyPair(seed); System.out.println("Derived KeyPair: " + keyPair); String message = BaseEncoding.base16().encode("test message".getBytes()); String signature = keyPairService.sign(message, keyPair.privateKey()); System.out.println("Message signature: " + signature); boolean verifies = keyPairService.verify(message, signature, keyPair.publicKey()); System.out.println("Signature verified? : " + verifies); ``` which produces the following output: ``` Generated seed: sEd7Ld6RUVbX9cZEG3jx221tCkq3ZaP Derived KeyPair: KeyPair{ privateKey=ED2AAB0754AEB0638D8B87777031F8A524C41A1492AF910BEEF2FBFDF08E2C9168, publicKey=ED0924FE18B96F63BD9C1EF74BC2DA8093840A4F1A272BD13FDBF6E3399AF24448 } Message signature: 6687EF589B2571938F42043A3617B09AEA92E5C2420C307E670145E9620149D8798224DF1AEB3E2B90CD30D2AD097530F8E32AF7324F2A0B573090C913189C00 Signature verified? : true ```