近期一個 php 轉 java 項目中遇到。寫出來分享一下：

java BCrypt 類庫。

https://github.com/patrickfav/bcrypt

@Test

public void testBCrypt() {

String password = "abcd";

String bcryptHashString = BCrypt.withDefaults().hashToString(12, password.toCharArray());

System.out.println(bcryptHashString);

// $2a$12$US00g/uMhoSBm.HiuieBjeMtoN69SN.GE25fCpldebzkryUyopws6

BCrypt.Result result = BCrypt.verifyer().verify(password.toCharArray(), bcryptHashString);

assert result.verified;

// String hash = BCrypt.with(customVersion2f).hashToString(10, password.toCharArray());

// String hash = BCrypt.with(BCrypt.Version.VERSION_2X).hashToString(10, password.toCharArray());

String hash = BCrypt.with(BCrypt.Version.VERSION_2Y).hashToString(10, password.toCharArray());

System.out.println(hash);

//from php

// hash = "$2y$10$SUr/RXt7IwSALE8x3W25huJDGDKWjBEisXIdS/As7CIqwLMgaUOE.";

// hash = "$2y$10$L.D2Q/d.7f0/vtJv7KzwXesxjlnAOkjmg/HjS4FXdWLJBE.tBZDSq";

hash = "$2y$10$gNNdf9tIKD3Sa.XOL/7zreGL9YQwk.d1iFYcOjMy3ab6EFKQ6P2yq";

//from php 'abCd'

// hash = "$2y$10$3i/2nXwBYFW353MhCDQJYusVhwlwZHiYKTSA9nm6GB6aiISsYzuXa";

BCrypt.Result res = BCrypt.verifyer().verify(password.toCharArray(), hash);

assert res.verified;

}

php hash 到 java 沒有問題

java hash 到 php 需要重新定義一些函數，文檔中提到：

For example the PHP implementation of bcrypt will return hashes with version $2y$. By using BCrypt.withDefaults() it will default to version $2a$. The older $2$ version is not supported. For advanced use cases you may add your own version by providing a version identifier and a custom message formatter as well as parser.

Version customVersion2f = new Version(new byte[]{0x32, 0x66} /* 2f */,true ,true, myCustomFormatter, myCustomParser);

總結

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