Question

java中rsa加密解密怎么设置模数

Answer 1

public static RSAPublicKey generateRSAPublicKey(byte[] modulus, byte[] publicExponent) {
KeyFactory keyFac = null;
try {
keyFac = KeyFactory.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
} catch (NoSuchAlgorithmException ex) {
throw new RuntimeException(ex.getMessage());
}

RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(modulus), new BigInteger(publicExponent));
try {
return (RSAPublicKey) keyFac.generatePublic(pubKeySpec);
} catch (InvalidKeySpecException ex) {
throw new RuntimeException(ex.getMessage());
}
}
要先把公钥模数和指数从16进制转换为字节数组

Answer 2

public static RSAPublicKey generateRSAPublicKey(byte[] modulus, byte[] publicExponent) {
KeyFactory keyFac = null;
try {
keyFac = KeyFactory.getInstance("RSA", new org.bouncycastle.jce.provider.BouncyCastleProvider());
} catch (NoSuchAlgorithmException ex) {
throw new RuntimeException(ex.getMessage());
}

RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(modulus), new BigInteger(publicExponent));
try {
return (RSAPublicKey) keyFac.generatePublic(pubKeySpec);
} catch (InvalidKeySpecException ex) {
throw new RuntimeException(ex.getMessage());
}
}
要先把公钥模数和指数从16进制转换为字节数组