java - PGP 使用什么算法来使用密码加密私钥？

Question

PGPKeyRingGenerator 构造函数采用密码短语来加密私钥。它用于执行此操作的算法是什么？它有一个名为 encAlgorithm 的字段，但我找不到任何解释这些算法是什么的文档。

Answer 1

默认情况下，PGP 使用 IDEA ( Refer this )。

其他算法可以在 encAlgorithm 中定义，OpenPGP 支持以下算法，

public interface SymmetricKeyAlgorithmTags
{
    public static final int NULL = 0;        // Plaintext or unencrypted data
    public static final int IDEA = 1;        // IDEA [IDEA]
    public static final int TRIPLE_DES = 2;  // Triple-DES (DES-EDE, as per spec -168 bit key derived from 192)
    public static final int CAST5 = 3;       // CAST5 (128 bit key, as per RFC 2144)
    public static final int BLOWFISH = 4;    // Blowfish (128 bit key, 16 rounds) [BLOWFISH]
    public static final int SAFER = 5;       // SAFER-SK128 (13 rounds) [SAFER]
    public static final int DES = 6;         // Reserved for DES/SK
    public static final int AES_128 = 7;     // Reserved for AES with 128-bit key
    public static final int AES_192 = 8;     // Reserved for AES with 192-bit key
    public static final int AES_256 = 9;     // Reserved for AES with 256-bit key
    public static final int TWOFISH = 10;    // Reserved for Twofish
}

它们都使用无填充的 CFB 模式。