node.js crypto 的文档表明填充会自动插入到输入流中。我有一个简单的测试程序,需要计算明文的 SHA1 哈希,然后使用带有 PKCS5 填充的 AES-256/CBC 加密该 20 字节哈希。这是我的测试代码:
var fs = require('fs');
var crypto = require('crypto');
var key = [ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f ];
var iv = [ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f ];
var test_string = "This is the string I am signing";
// Create SHA1 hash of our string
var sha1Hash = crypto.createHash("sha1");
sha1Hash.update(test_string, "utf8");
var sha1 = sha1Hash.digest();
var aesCipher =
crypto.createCipheriv("aes-256-cbc", (new Buffer(key)), (new Buffer(iv)));
aesCipher.update(sha1, "binary");
var encrypted = aesCipher.final("binary");
fs.writeFile('data/node_encrypted.bin', encrypted, function (error) {
if (error)
throw error;
console.log("File saved!");
});
但是,这会生成一个长度仅为 23 个字节的文件。我希望通过适当的 PKCS5 填充,输出将是 32 字节。我错过了什么?