在 JWT.IO 中验证签名 [英] Verify a signature in JWT.IO
本文介绍了在 JWT.IO 中验证签名的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已生成以下令牌并尝试使用
解决方案
jwt.io说要输入密钥
公钥或证书.仅当您想验证令牌时才以纯文本形式输入
所以 我已经将 JSON Web Key 转换为 PEM 格式，猜测它需要 base64 格式，并且它可以工作！
这是由模数和指数构建的公钥
-----BEGIN PUBLIC KEY-----MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqnTksBdxOiOlsmRNd + mMS2M3o1IDpK4uAr0T4/YqO3zYHAGAWTwsq4ms + NWynqY5HaB4EThNxuq2GWC5JKpO1YirOrwS97B5x9LJyHXPsdJcSikEI9BxOkl6WLQ0UzPxHdYTLpR4/O + 0ILAlXw8NU4 + jB4AP8Sn9YGYJ5w0fLw5YmWioXeWvocz1wHrZdJPxS8XnqHXwMUozVzQj + x6daOv5FmrHU1r9/bbp0a1GLv4BbTtSh4kMyz1hXylho0EvPg5p9YIKStbNAW9eNWvv5R8HN7PPei21AsUqxekK0oW9jnEdHewckToX7x5zULWKwwZIksll0XnVczVgy7fCFwIDAQAB-----结束公钥-----经过一些尝试，我决定编写一个简单的测试程序来检查 JWT 签名是否正确或者是密钥格式问题.您可以对其进行测试(Java 8).功能齐全
包测试；导入 java.math.BigInteger；导入 java.security.InvalidKeyException；导入 java.security.KeyFactory；导入 java.security.NoSuchAlgorithmException；导入 java.security.NoSuchProviderException；导入 java.security.PublicKey；导入 java.security.Signature；导入 java.security.SignatureException；导入 java.security.spec.InvalidKeySpecException；导入 java.security.spec.RSAPublicKeySpec；导入 java.util.Base64；公共类 JWKTest {私有静态最终字符串[] HEX_TABLE = 新字符串[]{00"、01"、02"、03"、04"、05"、06"、07"、08"、09"、0a"、0b"、0c"、0d"、0e"、0f"、10"、11"、12"、13"、14"、15"、16"、17"、18"、19"、1a"、1b"、1c"、1d"、1e"、1f"、20"、21"、22"、23"、24"、25"、26"、27"、28"、29"、2a"、2b"、2c"、2d"、2e"、2f"、30"、31"、32"、33"、34"、35"、36"、37"、38"、39"、3a"、3b"、3c"、3d"、3e"、3f"、40"、41"、42"、43"、44"、45"、46"、47"、48"、49"、4a"、4b"、4c"、4d"、4e"、4f"、50"、51"、52"、53"、54"、55"、56"、57"、58"、59"、5a"、5b"、5c"、5d"、5e"、5f"、60"、61"、62"、63"、64"、65"、66"、67"、68"、69"、6a"、6b"、6c"、6d"、6e"、6f"、70"、71"、72"、73"、74"、75"、76"、77"、78"、79"、7a"、7b"、7c"、7d"、7e"、7f"、80"、81"、82"、83"、84"、85"、86"、87"、88"、89"、8a"、8b"、8c"、8d"、8e"、8f"、90"、91"、92"、93"、94"、95"、96"、97"、98"、99"、9a"、9b"、9c"、9d"、9e"、9f"、a0"、a1"、a2"、a3"、a4"、a5"、a6"、a7"、a8"、a9"、aa"、ab"、ac"、ad"、ae"、af"、b0"、b1"、b2"、b3"、b4"、b5"、b6"、b7"、b8"、b9"、ba"、bb"、bc"、bd"、be"、bf"、c0"、c1"、c2"、c3"、c4"、c5"、c6"、c7"、c8"、c9"、ca"、cb"、cc"、cd"、ce"、cf"、d0"、d1"、d2"、d3"、d4"、d5"、d6"、d7"、d8"、d9"、da"、db"、dc"、dd"、de"、df"、e0"、e1"、e2"、e3"、e4"、e5"、e6"、e7"、e8"、e9"、ea"、eb"、ec"、ed"、ee"、ef"、f0"、f1"、f2"、f3"、f4"、f5"、f6"、f7"、f8"、f9"、fa"、fb"、fc"、fd"、fe"、ff"、};公共静态字符串 toHexFromBytes(byte[] bytes) {StringBuffer rc = new StringBuffer(bytes.length * 2);for (int i = 0; i < bytes.length; i++) {rc.append(HEX_TABLE[0xFF & bytes[i]]);}返回 rc.toString();}//从模数和指数构建公钥公共静态PublicKey getPublicKey(字符串模数B64u，字符串指数B64u)抛出NoSuchAlgorithmException，InvalidKeySpecException{//转换为大整数.我已转换为十六进制，因为 new BigDecimal(byte) 对我不起作用字节 exponentB[] = Base64.getUrlDecoder().decode(exponentB64u);字节模数B[] = Base64.getUrlDecoder().decode(modulusB64u);BigInteger 指数 = new BigInteger(toHexFromBytes(exponentB), 16);BigInteger 模数 = new BigInteger(toHexFromBytes(modulusB), 16);//构建公钥RSAPublicKeySpec 规范 = 新 RSAPublicKeySpec(模数，指数)；KeyFactory 工厂 = KeyFactory.getInstance(RSA");PublicKey pub = factory.generatePublic(spec);返回酒吧；}public final static void main (String argv[]) 抛出 NoSuchAlgorithmException、InvalidKeySpecException、SignatureException、NoSuchProviderException、InvalidKeyException{字符串 exponentB64u = "AQAB";串modulusB64u = QUOT; qnTksBdxOiOlsmRNd-mMS2M3o1IDpK4uAr0T4_YqO3zYHAGAWTwsq4ms-NWynqY5HaB4EThNxuq2GWC5JKpO1YirOrwS97B5x9LJyHXPsdJcSikEI9BxOkl6WLQ0UzPxHdYTLpR4_O-0ILAlXw8NU4-jB4AP8Sn9YGYJ5w0fLw5YmWioXeWvocz1wHrZdJPxS8XnqHXwMUozVzQj-x6daOv5FmrHU1r9_bbp0a1GLv4BbTtSh4kMyz1hXylho0EvPg5p9YIKStbNAW9eNWvv5R8HN7PPei21AsUqxekK0oW9jnEdHewckToX7x5zULWKwwZIksll0XnVczVgy7fCFw英寸;串JWT = QUOT; eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCI6ImEzck1VZ01Gdjl0UGNsTGE2eUYzekFrZnF1RSIsImtpZCI6ImEzck1VZ01Gdjl0UGNsTGE2eUYzekFrZnF1RSJ9.eyJub25jZSI6IjYzNjA3MDM0OTc3NDIzODg2NS5OMlkxTldKbU1EZ3RZbU13TkMwME9XWTNMVGt5TlRJdE9ERXpOell4Wm1NME0yVmxNV1l5TkdOaFlXTXRaVEpqT1MwME4yRmpMVGd6WmpVdFpXWTVOVEEwWmpFMU1qWTEiLCJpYXQiOjE0NzE0MzgxODIsImF0X2hhc2giOiJLWUJpVkl1Uy1YZERzU3NHcWU5dTJBIiwic3ViIjoiMSIsImFtciI6InBhc3N3b3JkIiwiYXV0aF90aW1lIjoxNDcxNDM4MTgyLCJpZHAiOiJpZHNydiIsImlzcyI6Imh0dHBzOi8vZWx3ZWJhcHBsaWNhdGlvbjEuYXp1cmV3ZWJzaXRlcy5uZXQvaWRlbnRpdHkiLCJhdWQiOiJtdmMiLCJleHAiOjE0NzE0Mzg0ODIsIm5iZiI6MTQ3MTQzODE4Mn0.Ehck2-rA09cJzlfURhDMp-WcXm_t_dl-u0Mli3exdv1HxX8i77x5VfFPM6rP4lcpI3lpN8Yj-FefZYDTUY_UmxCYvXf6ILSrhzEfQVaXSPKX1RUQQIDJGPU6NuFLcR416JpUAkE8joYae3WPj5VsM4yNENGGjUANm4qgj6G_mYy_BiXcSqvRGRYwW5GHDsnnANrIw4oktIYS05yCbjdiNYgQZ043L6Pb2p-5eTPCFqG7WRHp208dhg8D3nhtYEov2Kxod93oKHXSp1zf-Ot0cadk6Ss4fClaTE9S1f29lbwxw7ZxI1L3R4oOL3FZPSSHGp4d3a3AdUKOjKvvTVPv6w英寸;//根据模数和指数构建公钥PublicKey publicKey = getPublicKey (modulusB64u,exponentB64u);//将密钥打印为 PEM(base64 和标头)字符串 publicKeyPEM =-----开始公钥-----
"+ Base64.getEncoder().encodeToString(publicKey.getEncoded()) +"
"+ "-----END PUBLIC KEY-----";System.out.println(publicKeyPEM);//从JWT获取签名数据和签名String signedData = jwt.substring(0, jwt.lastIndexOf("."));字符串签名B64u = jwt.substring(jwt.lastIndexOf(".")+1,jwt.length());字节签名[] = Base64.getUrlDecoder().decode(signatureB64u);//验证签名签名 sig = Signature.getInstance(SHA256withRSA");sig.initVerify(publicKey);sig.update(signedData.getBytes());布尔 v = sig.verify(签名);System.out.println(v);}}I have generated the following token and am trying to verify the signature with http://jwt.io I have also attached the contents of my jwks endpoint that should have all the details I need to verify.
So my question is: how do I get this to say signature valid on the jwt.io website? Am I missing some transformation on the certificate chain parameter?
Here is the spec for jwks for reference.
eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCI6ImEzck1VZ01Gdjl0UGNsTGE2eUYzekFrZnF1RSIsImtpZCI6ImEzck1VZ01Gdjl0UGNsTGE2eUYzekFrZnF1RSJ9.eyJub25jZSI6IjYzNjA3MDM0OTc3NDIzODg2NS5OMlkxTldKbU1EZ3RZbU13TkMwME9XWTNMVGt5TlRJdE9ERXpOell4Wm1NME0yVmxNV1l5TkdOaFlXTXRaVEpqT1MwME4yRmpMVGd6WmpVdFpXWTVOVEEwWmpFMU1qWTEiLCJpYXQiOjE0NzE0MzgxODIsImF0X2hhc2giOiJLWUJpVkl1Uy1YZERzU3NHcWU5dTJBIiwic3ViIjoiMSIsImFtciI6InBhc3N3b3JkIiwiYXV0aF90aW1lIjoxNDcxNDM4MTgyLCJpZHAiOiJpZHNydiIsImlzcyI6Imh0dHBzOi8vZWx3ZWJhcHBsaWNhdGlvbjEuYXp1cmV3ZWJzaXRlcy5uZXQvaWRlbnRpdHkiLCJhdWQiOiJtdmMiLCJleHAiOjE0NzE0Mzg0ODIsIm5iZiI6MTQ3MTQzODE4Mn0.Ehck2-rA09cJzlfURhDMp-WcXm_t_dl-u0Mli3exdv1HxX8i77x5VfFPM6rP4lcpI3lpN8Yj-FefZYDTUY_UmxCYvXf6ILSrhzEfQVaXSPKX1RUQQIDJGPU6NuFLcR416JpUAkE8joYae3WPj5VsM4yNENGGjUANm4qgj6G_mYy_BiXcSqvRGRYwW5GHDsnnANrIw4oktIYS05yCbjdiNYgQZ043L6Pb2p-5eTPCFqG7WRHp208dhg8D3nhtYEov2Kxod93oKHXSp1zf-Ot0cadk6Ss4fClaTE9S1f29lbwxw7ZxI1L3R4oOL3FZPSSHGp4d3a3AdUKOjKvvTVPv6w
{
keys : [{
kty : "RSA",
use : "sig",
kid : "a3rMUgMFv9tPclLa6yF3zAkfquE",
x5t : "a3rMUgMFv9tPclLa6yF3zAkfquE",
e : "AQAB",
n : "qnTksBdxOiOlsmRNd-mMS2M3o1IDpK4uAr0T4_YqO3zYHAGAWTwsq4ms-NWynqY5HaB4EThNxuq2GWC5JKpO1YirOrwS97B5x9LJyHXPsdJcSikEI9BxOkl6WLQ0UzPxHdYTLpR4_O-0ILAlXw8NU4-jB4AP8Sn9YGYJ5w0fLw5YmWioXeWvocz1wHrZdJPxS8XnqHXwMUozVzQj-x6daOv5FmrHU1r9_bbp0a1GLv4BbTtSh4kMyz1hXylho0EvPg5p9YIKStbNAW9eNWvv5R8HN7PPei21AsUqxekK0oW9jnEdHewckToX7x5zULWKwwZIksll0XnVczVgy7fCFw",
x5c : [
"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"
]
}
]
}
解决方案
jwt.io says to enter the key
Public Key or Certificate. Enter it in plain text only if you want to verify a token
so I have converted the JSON Web Key to a PEM format guessing it would need a base64 format, and it works!.
This is the public key built from modulus and exponent
-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqnTksBdxOiOlsmRNd+mMS2M3o1IDpK4uAr0T4/YqO3zYHAGAWTwsq4ms+NWynqY5HaB4EThNxuq2GWC5JKpO1YirOrwS97B5x9LJyHXPsdJcSikEI9BxOkl6WLQ0UzPxHdYTLpR4/O+0ILAlXw8NU4+jB4AP8Sn9YGYJ5w0fLw5YmWioXeWvocz1wHrZdJPxS8XnqHXwMUozVzQj+x6daOv5FmrHU1r9/bbp0a1GLv4BbTtSh4kMyz1hXylho0EvPg5p9YIKStbNAW9eNWvv5R8HN7PPei21AsUqxekK0oW9jnEdHewckToX7x5zULWKwwZIksll0XnVczVgy7fCFwIDAQAB
-----END PUBLIC KEY-----
After some attemps I decided to write a simple test program to check if JWT signature is correct or it was a key format issue. You can test it (Java 8). It is fully functional
package test;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPublicKeySpec;
import java.util.Base64;
public class JWKTest {
private static final String[] HEX_TABLE = new String[]{
"00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f",
"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f",
"20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f",
"30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f",
"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f",
"50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f",
"60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6a", "6b", "6c", "6d", "6e", "6f",
"70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f",
"80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b", "8c", "8d", "8e", "8f",
"90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f",
"a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af",
"b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf",
"c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf",
"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df",
"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef",
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff",
};
public static String toHexFromBytes(byte[] bytes) {
StringBuffer rc = new StringBuffer(bytes.length * 2);
for (int i = 0; i < bytes.length; i++) {
rc.append(HEX_TABLE[0xFF & bytes[i]]);
}
return rc.toString();
}
// Build the public key from modulus and exponent
public static PublicKey getPublicKey (String modulusB64u, String exponentB64u) throws NoSuchAlgorithmException, InvalidKeySpecException{
//conversion to BigInteger. I have transformed to Hex because new BigDecimal(byte) does not work for me
byte exponentB[] = Base64.getUrlDecoder().decode(exponentB64u);
byte modulusB[] = Base64.getUrlDecoder().decode(modulusB64u);
BigInteger exponent = new BigInteger(toHexFromBytes(exponentB), 16);
BigInteger modulus = new BigInteger(toHexFromBytes(modulusB), 16);
//Build the public key
RSAPublicKeySpec spec = new RSAPublicKeySpec(modulus, exponent);
KeyFactory factory = KeyFactory.getInstance("RSA");
PublicKey pub = factory.generatePublic(spec);
return pub;
}
public final static void main (String argv[]) throws NoSuchAlgorithmException, InvalidKeySpecException, SignatureException, NoSuchProviderException, InvalidKeyException{
String exponentB64u = "AQAB";
String modulusB64u = "qnTksBdxOiOlsmRNd-mMS2M3o1IDpK4uAr0T4_YqO3zYHAGAWTwsq4ms-NWynqY5HaB4EThNxuq2GWC5JKpO1YirOrwS97B5x9LJyHXPsdJcSikEI9BxOkl6WLQ0UzPxHdYTLpR4_O-0ILAlXw8NU4-jB4AP8Sn9YGYJ5w0fLw5YmWioXeWvocz1wHrZdJPxS8XnqHXwMUozVzQj-x6daOv5FmrHU1r9_bbp0a1GLv4BbTtSh4kMyz1hXylho0EvPg5p9YIKStbNAW9eNWvv5R8HN7PPei21AsUqxekK0oW9jnEdHewckToX7x5zULWKwwZIksll0XnVczVgy7fCFw";
String jwt = "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCI6ImEzck1VZ01Gdjl0UGNsTGE2eUYzekFrZnF1RSIsImtpZCI6ImEzck1VZ01Gdjl0UGNsTGE2eUYzekFrZnF1RSJ9.eyJub25jZSI6IjYzNjA3MDM0OTc3NDIzODg2NS5OMlkxTldKbU1EZ3RZbU13TkMwME9XWTNMVGt5TlRJdE9ERXpOell4Wm1NME0yVmxNV1l5TkdOaFlXTXRaVEpqT1MwME4yRmpMVGd6WmpVdFpXWTVOVEEwWmpFMU1qWTEiLCJpYXQiOjE0NzE0MzgxODIsImF0X2hhc2giOiJLWUJpVkl1Uy1YZERzU3NHcWU5dTJBIiwic3ViIjoiMSIsImFtciI6InBhc3N3b3JkIiwiYXV0aF90aW1lIjoxNDcxNDM4MTgyLCJpZHAiOiJpZHNydiIsImlzcyI6Imh0dHBzOi8vZWx3ZWJhcHBsaWNhdGlvbjEuYXp1cmV3ZWJzaXRlcy5uZXQvaWRlbnRpdHkiLCJhdWQiOiJtdmMiLCJleHAiOjE0NzE0Mzg0ODIsIm5iZiI6MTQ3MTQzODE4Mn0.Ehck2-rA09cJzlfURhDMp-WcXm_t_dl-u0Mli3exdv1HxX8i77x5VfFPM6rP4lcpI3lpN8Yj-FefZYDTUY_UmxCYvXf6ILSrhzEfQVaXSPKX1RUQQIDJGPU6NuFLcR416JpUAkE8joYae3WPj5VsM4yNENGGjUANm4qgj6G_mYy_BiXcSqvRGRYwW5GHDsnnANrIw4oktIYS05yCbjdiNYgQZ043L6Pb2p-5eTPCFqG7WRHp208dhg8D3nhtYEov2Kxod93oKHXSp1zf-Ot0cadk6Ss4fClaTE9S1f29lbwxw7ZxI1L3R4oOL3FZPSSHGp4d3a3AdUKOjKvvTVPv6w";
//Build the public key from modulus and exponent
PublicKey publicKey = getPublicKey (modulusB64u,exponentB64u);
//print key as PEM (base64 and headers)
String publicKeyPEM =
"-----BEGIN PUBLIC KEY-----
"
+ Base64.getEncoder().encodeToString(publicKey.getEncoded()) +"
"
+ "-----END PUBLIC KEY-----";
System.out.println( publicKeyPEM);
//get signed data and signature from JWT
String signedData = jwt.substring(0, jwt.lastIndexOf("."));
String signatureB64u = jwt.substring(jwt.lastIndexOf(".")+1,jwt.length());
byte signature[] = Base64.getUrlDecoder().decode(signatureB64u);
//verify Signature
Signature sig = Signature.getInstance("SHA256withRSA");
sig.initVerify(publicKey);
sig.update(signedData.getBytes());
boolean v = sig.verify(signature);
System.out.println(v);
}
}
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