为什么我用openssl和golang生成的RSA签名不同？

Question

我使用openssl命令对消息“ Test。”进行签名，使用hexdump输出

# echo "Test." | openssl rsautl -inkey privite.key -sign -hexdump
0000 - 09 1b ce e2 4b 69 86 be-d7 b1 fb f0 ec e4 53 0e   ....Ki........S.
0010 - ef 9c a4 7b db d3 21 d5-3e 78 23 61 89 34 7e bc   ...{..!.>x#a.4~.
0020 - e9 1e 5a e9 f4 40 e6 53-07 e4 dd 1a fe 31 ec 42   ..Z..@.S.....1.B
0030 - 98 a5 07 d4 7e d9 f4 01-2f ba a3 65 18 b7 69 a4   ....~.../..e..i.

十六进制字符串是091bcee24b69 …

我的私钥

# cat private.Key
-----BEGIN RSA PRIVATE KEY-----
MIIBOgIBAAJBALKZD0nEffqM1ACuak0bijtqE2QrI/KLADv7l3kK3ppMyCuLKoF0
fd7Ai2KW5ToIwzFofvJcS/STa6HA5gQenRUCAwEAAQJBAIq9amn00aS0h/CrjXqu
/ThglAXJmZhOMPVn4eiu7/ROixi9sex436MaVeMqSNf7Ex9a8fRNfWss7Sqd9eWu
RTUCIQDasvGASLqmjeffBNLTXV2A5g4t+kLVCpsEIZAycV5GswIhANEPLmax0ME/
EO+ZJ79TJKN5yiGBRsv5yvx5UiHxajEXAiAhAol5N4EUyq6I9w1rYdhPMGpLfk7A
IU2snfRJ6Nq2CQIgFrPsWRCkV+gOYcajD17rEqmuLrdIRexpg8N1DOSXoJ8CIGlS
tAboUGBxTDq3ZroNism3DaMIbKPyYrAqhKov1h5V
-----END RSA PRIVATE KEY-----

使用Golang生成签名

var prvKeyPem = `-----BEGIN RSA PRIVATE KEY-----
MIIBOgIBAAJBALKZD0nEffqM1ACuak0bijtqE2QrI/KLADv7l3kK3ppMyCuLKoF0
fd7Ai2KW5ToIwzFofvJcS/STa6HA5gQenRUCAwEAAQJBAIq9amn00aS0h/CrjXqu
/ThglAXJmZhOMPVn4eiu7/ROixi9sex436MaVeMqSNf7Ex9a8fRNfWss7Sqd9eWu
RTUCIQDasvGASLqmjeffBNLTXV2A5g4t+kLVCpsEIZAycV5GswIhANEPLmax0ME/
EO+ZJ79TJKN5yiGBRsv5yvx5UiHxajEXAiAhAol5N4EUyq6I9w1rYdhPMGpLfk7A
IU2snfRJ6Nq2CQIgFrPsWRCkV+gOYcajD17rEqmuLrdIRexpg8N1DOSXoJ8CIGlS
tAboUGBxTDq3ZroNism3DaMIbKPyYrAqhKov1h5V
-----END RSA PRIVATE KEY-----`

func GenerateSignature() {
    block, _ := pem.Decode([]byte(prvKeyPem))
    if block == nil {
        panic("failed to parse root certificate PEM")
    }
    privKey, err := x509.ParsePKCS1PrivateKey(block.Bytes) //x509.ParseCertificate(block.Bytes)
    if err != nil {
        panic("failed to parse certificate: " + err.Error())
    }
    indata := "Test."
    h := sha256.New()
    h.Write([]byte(indata))
    digest := h.Sum(nil)

    s, err := rsa.SignPKCS1v15(rand.Reader, privKey, crypto.SHA256, digest)
    if err != nil {
        panic("failed to sign:" + err.Error())
    }
    fmt.Printf("%x\n", s)
}

func main() {
    GenerateSignature()
}

运行此代码，输出如下：52e1cce3810c1a89693cf6965d1035618820a9e3a7b95203d885c4153dc3f7424b98e3ba628a186f1074d672bb59a1c0788a9c2064951ca2326eb1bf8e3e49e9e9

但我认为应该是：

091bcee24b69 …

我哪里错了？ 谢谢

Answer 1

除了helmbert的答案中所echo描述的添加的换行符外，OpenSSL
命令还直接对提供的数据进行操作，而Go代码首先使用SHA256对数据进行哈希处理，然后对结果摘要进行签名。rsautl

要与使用OpenSSL的Go代码执行相同的操作，可以将该dgst命令与-sign选项一起使用（请注意，我在此处也包含该-n选项echo）：

$ echo -n "Test." | openssl dgst -sha256 -sign private.key -hex
52e1cce3810c1a89693cf6965d1035618820a9e3a7b95203d885c4153dc3f7424b98e3ba628a186f1074d672bb59a1c0788a9c2064951ca2326eb1bf8e3e49e9

要采用另一种方法并在不对Go代码进行哈希处理的情况下对原始消息进行签名，可以将参数0的值传递hash给rsa.SignPKCS1v15：

indata := []byte("Test.")

s, err := rsa.SignPKCS1v15(nil, privKey, 0, indata)