Javacard發送APDU中的RSA公鑰

Question

通過APDU發送JavaCard RSAPublicKey會有什麼好的解決方案？ 獲取指數和模塊並將它們打包到一個字節數組中？

Answer 1

是的，您需要將指數和模數序列化爲一個字節數組。這兩種方法解決您的問題：

//reads the key object and stores it into the buffer 
private final short serializeKey(RSAPublicKey key, byte[] buffer, short offset) { 
    short expLen = key.getExponent(buffer, (short) (offset + 2)); 
    Util.setShort(buffer, offset, expLen); 
    short modLen = key.getModulus(buffer, (short) (offset + 4 + expLen)); 
    Util.setShort(buffer, offset + 2 + expLen, modLen); 
    return (short) (4 + expLen + modLen); 
} 

//reads the key from the buffer and stores it inside the key object 
private final short deserializeKey(RSAPublicKey key, byte[] buffer, short offset) { 
    short expLen = Util.getShort(buffer, offset); 
    key.setExponent(buffer, (short) (offset + 2), expLen); 
    short modLen = Util.getShort(buffer, (short) (offset + 2 + expLen)); 
    key.setModulus(buffer, (short) (offset + 4 + expLen), modLen); 
    return (short) (4 + expLen + modLen); 
}