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InputStream is = this.getAssets().open(fileName);
CertificateFactory cf = CertificateFactory.getInstance("X.509");
X509Certificate certificate = (X509Certificate) cf.generateCertificate(is);
PublicKey publicKey = certificate.getPublicKey();
Cipher tcsCipher = Cipher.getInstance(publicKey.getAlgorithm());
tcsCipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] encode = Base64.encode("123".getBytes(),Base64.DEFAULT);<br>
byte[] doFinal = tcsCipher.doFinal(encode);<br>
String tcsEncryptPassword = Base64.encodeToString(doFinal, Base64.DEFAULT);
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