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README
Apache-2.0

paillier-lib

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paillier同态加密算法库,具体包括:

  1. java库:实现了完整的paillier同态库,可完成加解密和同态加运算。

  2. cpp接口:提供同态加接口,核心算法由c语言实现,并用c++实现了调用协议的封装。

FISCO BCOS隐私模块中同态加密的预编译合约便是调用此cpp同态接口。java同态库和cpp同态接口的密文封装协议是一致的, 即通过java同态库生成的密文可以直接调用cpp同态接口完成加同态运算,生成的同态密文可以调用java同态库解密。

关键特性

  • 公私钥对生成和编解码
  • 密文的paillier加法同态运算
  • java库提供了完整的同态功能支持,cpp接口为链上预编译合约提供密文加同态支持

Java库说明

公私钥模块(PaillierKeyPair)

  • 接口名称:generateGoodKeyPair
  • 接口功能说明:生成同态加密的公私钥对,2048位
输入 类型 说明
输出 类型 说明
返回值 KeyPair 生成的密钥对
  • 接口名称:generateStrongKeyPair
  • 接口功能说明:生成同态加密的公私钥对,4096位
输入 类型 说明
输出 类型 说明
返回值 KeyPair 生成的密钥对

同态算法模块(PaillierCipher)

  • 接口名称:encrypt
  • 接口功能说明:对数据进行同态加密
输入 类型 说明
m BigInteger 待加密的操作数
publickey PublicKey 加密公钥,可以通过公私钥模块获取
输出 类型 说明
返回值 String 成功:密文, 失败:空串
  • 接口名称:decrypt
  • 接口功能说明:对加密数据进行解密还原操作数
输入 类型 说明
ciphertext String 密文
privateKey PrivateKey 解密私钥,可以通过公私钥模块获取
输出 类型 说明
返回值 BigInteger 成功:明文, 失败:空串
  • 接口名称:ciphertextAdd
  • 接口功能说明:加法同态实现
输入 类型 说明
ciphertext1 String 同态加密后的操作数1
ciphertext2 String 同态加密后的操作数2
输出 类型 说明
返回值 String 成功:密文, 失败:空串

使用教程

生成jar包

生成的jar文件位于paillierJava/dist目录

# 下载
git clone https://github.com/FISCO-BCOS/paillier-lib.git
# 编译
cd paillier-lib/paillierJava && gradle build

开发示例

// generate the key pair for encrypt and decrypt
KeyPair keypair = PaillierKeyPair.generateGoodKeyPair();
RSAPublicKey pubKey = (RSAPublicKey)keypair.getPublic();
RSAPrivateKey priKey = (RSAPrivateKey)keypair.getPrivate();

// encrypt the first number with public key
BigInteger i1 = BigInteger.valueOf(1000000);
String c1 = PaillierCipher.encrypt(i1, pubKey);

// encrypt the second number with same public key
BigInteger i2 = BigInteger.valueOf(2012012012);
String c2 = PaillierCipher.encrypt(i2, pubKey);

// paillier add with numbers
String c3 = PaillierCipher.ciphertextAdd(c1,c2);

// decrypt the result
BigInteger o3 = PaillierCipher.decrypt(c3, priKey);

Cpp接口说明

密文同态加接口

  • 接口名称:paillierAdd
  • 接口功能说明:加法同态接口
输入 类型 说明
cipher1 string 同态加密后的操作数1
cipher2 string 同态加密后的操作数2
输出 类型 说明
返回值 string 成功:密文, 失败:空串

编译运行

# 假设当前在paillier-lib目录
mkdir build && cd build
# CentOS请使用cmake3
cmake ..
# 编译paillierCpp库以及测试代码
make
# 运行测试代码
./testAdd

贡献代码

  • 我们欢迎并非常感谢您的贡献,请参阅代码贡献流程
  • 如项目对您有帮助,欢迎star支持!

加入社区

FISCO BCOS开源社区是国内活跃的开源社区,社区长期为机构和个人开发者提供各类支持与帮助。已有来自各行业的数千名技术爱好者在研究和使用FISCO BCOS。如您对FISCO BCOS开源技术及应用感兴趣,欢迎加入社区获得更多支持与帮助。

License

license

paillier-lib的开源协议为APACHE LICENSE 2.0. 详情参考LICENSE

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