本段代码能够读取APK签名中的开发者信息，哈哈，有趣。

感谢曾阳提供的代码。

import sun.security.pkcs.PKCS7;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.security.GeneralSecurityException;

import java.security.cert.X509Certificate;

public class SignApk {

public static X509Certificate readSignatureBlock(InputStream in) throws IOException, GeneralSecurityException {

PKCS7 pkcs7 = new PKCS7(in);

return pkcs7.getCertificates()[0];

}

public static void main(String[] args) throws FileNotFoundException, IOException, GeneralSecurityException {

X509Certificate publicKey = readSignatureBlock(new FileInputStream("./CERT.RSA"));

System.out.println("issuer:" + publicKey.getIssuerDN());

System.out.println("subject:" + publicKey.getSubjectDN());

System.out.println(publicKey.getPublicKey());

}

}

输出如下：

issuer:CN=Sodino

subject:CN=SodinoChen

Sun RSA public key, 1024 bits

modulus: 154308594144468705348294760484396264219304223307125368116140288659005422830114898674784044956357283073098453132761265419031547660249768235885852151387544779929680291539693130807734777897342583741160281523340554669518353638961667015615312475350767041053961957188628650343640790505255765999004862716823611888529

public exponent: 65537

另外，使用如下命令也可读出指定APK包的签名信息：

jarsigner -verify -verbose -certs

再者，对于一个keystore的指纹信息获取可以用如下命令：

D:/>keytool -list -alias alias_name -keystore keystore_name.KEYSTORE

输入keystore密码：

sodino_keystore, 2010-8-9, PrivateKeyEntry,

认证指纹 (MD5)： CB:5E:F5:33:23:F4:D2:D3:CC:74:9D:BF:14:36:EB:8D

在Linux下，也可以使用openssl命令来获取：

$ openssl pkcs7 -in CERT.RSA -inform DER -print_certs

subject=/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@an

roid.com

issuer=/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@and

oid.com

-----BEGIN CERTIFICATE-----

MIIEqDCCA5CgAwIBAgIJALOZgIbQVs/6MA0GCSqGSIb3DQEBBAUAMIGUMQswCQYD

VQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEWMBQGA1UEBxMNTW91bnRhaW4g

VmlldzEQMA4GA1UEChMHQW5kcm9pZDEQMA4GA1UECxMHQW5kcm9pZDEQMA4GA1UE

AxMHQW5kcm9pZDEiMCAGCSqGSIb3DQEJARYTYW5kcm9pZEBhbmRyb2lkLmNvbTAe

Fw0wODA0MTUyMjQwNTBaFw0zNTA5MDEyMjQwNTBaMIGUMQswCQYDVQQGEwJVUzET

MBEGA1UECBMKQ2FsaWZvcm5pYTEWMBQGA1UEBxMNTW91bnRhaW4gVmlldzEQMA4G

A1UEChMHQW5kcm9pZDEQMA4GA1UECxMHQW5kcm9pZDEQMA4GA1UEAxMHQW5kcm9p

ZDEiMCAGCSqGSIb3DQEJARYTYW5kcm9pZEBhbmRyb2lkLmNvbTCCASAwDQYJKoZI

hvcNAQEBBQADggENADCCAQgCggEBAJx4BZKsDV04HN6qZezIpgBuNkgMbXIHsSAR

vlCGOqvitV0Amt9xRtbyICKAx81Ne9smJDuKgGwms0sTdSOkkmgiSQTcAUk+fArP

GgXIdPabA3tgMJ2QdNJCgOFrrSqHNDYZUer3KkgtCbIEsYdeEqyYwap3PWgAuer9

5W1Yvtjo2hb5o2AJnDeoNKbf7be2tEoEngeiafzPLFSW8s821k35CjuNjzSjuqtM

9TNxqydxmzulh1StDFP8FOHbRdUeI0+76TybpO35zlQmE1DsU1YHv2mi/0qgfbX3

6iANCabBtJ4hQC+J7RGQiTqrWpGA8VLoL4WkV1PPX8GQccXuyCcCAQOjgfwwgfkw

HQYDVR0OBBYEFE/koLPdnLop9x1yh8Tnw48ghsKZMIHJBgNVHSMEgcEwgb6AFE/k

oLPdnLop9x1yh8Tnw48ghsKZoYGapIGXMIGUMQswCQYDVQQGEwJVUzETMBEGA1UE

CBMKQ2FsaWZvcm5pYTEWMBQGA1UEBxMNTW91bnRhaW4gVmlldzEQMA4GA1UEChMH

QW5kcm9pZDEQMA4GA1UECxMHQW5kcm9pZDEQMA4GA1UEAxMHQW5kcm9pZDEiMCAG

CSqGSIb3DQEJARYTYW5kcm9pZEBhbmRyb2lkLmNvbYIJALOZgIbQVs/6MAwGA1Ud

EwQFMAMBAf8wDQYJKoZIhvcNAQEEBQADggEBAFclUbjZOh9z3g9tRp+G2tZwFAAp

PIigzXzXeLc9r8wZf6t25iEuVsHHYc/EL9cz3lLFCuCIFM78CjtaGkNGBU2Cnx2C

tCsgSL+ItdFJKe+F9g7dEtctVWV+IuPoXQTIMdYT0Zk4u4mCJH+jISVroS0dao+S

6h2xw3Mxe6DAN/DRr/ZFrvIkl5+6bnoUvAJccbmBOM7z3fwFlhfPJIRc97QNY4L3

J17XOElatuWTG5QhdlxJG3L7aOCA29tYwgKdNHyLMozkPvaosVUz7fvpib1qSN1L

IC7alMarjdW4OZID2q4u1EYjLk/pvZYTlMYwDlE448/Shebk5INTjLixs1c=

-----END CERTIFICATE-----