一个适用于微信小程序的RSA签名库。

RSA签名的小程序DEMO：https://github.com/zhangzhaopds/WeixinApp_RSA_Signature.git

使用

1、引入文件

var RSA = require('../../utils/wxapp_rsa.js')

2、调用

var privateKey_pkcs1 = '-----BEGIN RSA PRIVATE KEY-----MIICXQIBAAKBgQCk7WKdggwBOtteLL5sPom8RYCjuw0hy6R1jH39tCaep1Dns02bi4CYHk2dSR / t0ABgF5pHYeMxHa74Dp6Z6SjfAKMUu53BbTR615ehK + 03BjtzJzviTF1 / NtLmGaR3aawrDp7oQgq33dfIYbWLuAMkHNiWaoXaGyHh3a8jS2vxfQIDAQABAoGAIKRnLzts + tVWU5ZRfgUGp7 + tzToZSEYQ378VtJ / yQNZmueUQCCgdJH5i6C1v51aSrHIfc99Y4wC3/ 5qNI3M1RlRpIakmcaiEv1m6huDPLKFq6Y1e+ AZ0Cb0xo3bny + VTOvfGgcAdSa6++K47bGaxyKzwGeNZQkltm5sgbVcKvkECQQDVjWbSU8P8nDb+TP5Aqr + DaMVA425wv2ra2jhxd6KqKxgHHB7yYWlODiYNrtALOEG9zfSpHVQWhZpiKq8XcWwRAkEAxbWzPAqZxaZ / XTs65uCL0 + iqif0qCSDUNis61wYm2UwOh4LqBZIFop94B3ybEXbCvUl0v26H0fgXjFUErvlKrQJBAKjbAe5U5accLi + t2WxwlrXlZfME4hKsiGU8H10455n+ MSWOCrpEY + ugLF6tVztH5FOcQlRmKFMWmRf + ACxdNsECQDBjkEKZtZkSbwm6fWgUfSSYRWUQeUFSr52yZuxJrShx3Px9phlG6 + opbY8niCx2DKOXXuObgdJ6DglipYrNqOECQQCndP + zU / jwlvjQzEabKdP05uFc5JV6ySFBQwuoENbEvW3uz + Yz31xDYbrwIzrysVDovlj0ExL6LC + JRvpJmHcN-----END RSA PRIVATE KEY-----'
    var publicKey_pkcs1 = '-----BEGIN PUBLIC KEY-----MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCk7WKdggwBOtteLL5sPom8RYCjuw0hy6R1jH39tCaep1Dns02bi4CYHk2dSR / t0ABgF5pHYeMxHa74Dp6Z6SjfAKMUu53BbTR615ehK + 03BjtzJzviTF1/ NtLmGaR3aawrDp7oQgq33dfIYbWLuAMkHNiWaoXaGyHh3a8jS2vxfQIDAQAB-----END PUBLIC KEY-----'

    // 加签
    var sign_rsa = new RSA.RSAKey(); 
    sign_rsa = RSA.KEYUTIL.getKey(privateKey_pkcs1); 
    console.log('签名RSA:')
    console.log(sign_rsa)
    var hashAlg = 'sha1';
    var hSig = sign_rsa.signString("signData", hashAlg); 
    hSig = RSA.hex2b64(hSig); // hex 转 b64
    console.log("签名结果：" + hSig)

    // 验签
    var verify_rsa = new RSA.RSAKey();
    verify_rsa = RSA.KEYUTIL.getKey(publicKey_pkcs1);
    console.log('验签RSA:')
    console.log(verify_rsa)
    hSig = RSA.b64tohex(hSig)
    var ver = verify_rsa.verifyString("signData", hSig) 
    console.log('验签结果：' + ver)

    // 加密 【加密字段长度不大于117】
    var encrypt_rsa = new RSA.RSAKey();
    encrypt_rsa = RSA.KEYUTIL.getKey(publicKey_pkcs1);
    console.log('加密RSA:')
    console.log(encrypt_rsa)
    var encStr = encrypt_rsa.encrypt('123456')
    encStr = RSA.hex2b64(encStr);
    console.log("加密结果：" + encStr)

    // 解密
    var decrypt_rsa = new RSA.RSAKey();
    decrypt_rsa = RSA.KEYUTIL.getKey(privateKey_pkcs1);
    console.log('解密RSA:')
    console.log(decrypt_rsa)
    encStr = RSA.b64tohex(encStr)
    var decStr = decrypt_rsa.decrypt(encStr)
    console.log("解密结果：" + decStr)

需要注意的是：区分RSA私钥的类型，有pkcs1和pkcs8。pkcs8格式的私钥主要用于java中。

// pkcs1格式：
-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY------

// pkcs8格式：
-----BEGIN PRIVATE KEY-----
-----END PRIVATE KEY-----