为什么 public_key_verify_signature() 返回错误 -74？

Question

我正在通过内核验证签名，使用内核模块 crypto。内核版本：6.1.0-3-generic。以下是使用的数据，在用户态可以通过测试，但在内核中无法通过验证。

谁能指出我的错误或遗漏的地方。任何帮助将不胜感激

[plain.txt]中的测试数据：

123

[private_key.pem]中的私钥：

通过以下命令获取签名

 openssl dgst -sha256 -sign private_key.pem -out signature.sig plain.txt

文件[signature.sig]中的签名，通过od转换为可读的十六进制格式：

0x1f,0x26,0x09,0xa3,0xad,0x91,0x3a,0xb1,0xd2,0x14,0x50,0x07,0x2d,0x98,0x5d,0x95,0xed,0x3f,0x02,0xd7,0x1c,0x83,0x74,0xa9,0x18,0x6a,0xe6,0x0f,0xd0,0xac,0x21,0x65,0xa9,0x78,0x1f,0x85,0x2c,0xc0,0xbe,0x5b,0xfe,0x7e,0x9a,0x7b,0x57,0xb1,0x4d,0xf6,0x0c,0x29,0xe5,0xea,0xd6,0x24,0x06,0xe5,0x6b,0x6c,0x7c,0x66,0x29,0xbd,0x9b,0x35,0x59,0x35,0xd4,0xf5,0x73,0xc0,0x7a,0xc1,0xc2,0xba,0xa5,0x43,0x2f,0xd1,0x25,0xcb,0xfe,0x32,0x91,0x5a,0x2b,0x9d,0xc2,0xa2,0x03,0x14,0x5f,0x70,0xc5,0x48,0x5f,0xb7,0xcf,0x0f,0x40,0xb2,0x8b,0xeb,0x16,0x39,0xfb,0x81,0xb5,0xb0,0xa9,0xb3,0xa7,0xf5,0x72,0x5d,0xb7,0xe1,0x24,0xa3,0xc4,0xcc,0x3e,0x7b,0x2b,0x09,0x56,0x0c,0xc5,0xc0,0xb0,0xb0,0x35,0xb4,0xff,0x74,0x58,0x6e,0xcb,0x2d,0x5b,0x4a,0x84,0x40,0x14,0xc5,0xc1,0x6a,0x69,0x0b,0xee,0x61,0x8c,0x42,0xfa,0xf3,0x5f,0xb0,0x49,0x68,0x05,0xb8,0x81,0xcc,0xf5,0x0f,0xfc,0x14,0x2b,0x1d,0x04,0x22,0xfa,0xa3,0x1c,0xfd,0x3a,0xc9,0xa3,0xe7,0xa3,0x5e,0xab,0x64,0x1c,0xac,0xd9,0x29,0x2e,0xf5,0x1c,0xc2,0x8e,0x8b,0xe4,0xb8,0xb1,0x00,0xc8,0xdd,0x8e,0x8f,0x22,0x93,0x71,0xe1,0x9d,0xe8,0x02,0x83,0x07,0x48,0x34,0x60,0x5a,0x1c,0x7c,0xa5,0x1e,0xa7,0x1c,0xfd,0xe2,0xa0,0xf7,0xc0,0xc4,0x66,0xa4,0xde,0xcd,0xda,0xf8,0xc8,0x89,0x07,0x56,0xf5,0xef,0xc6,0x12,0xd7,0xe4,0xa4,0xaa,0x18,0x70,0xeb,0x56,0xfc,0xdd,0xd6,0x0e,0x9a,0x68,0xdd,0x90,0x7b

[public_key.der]中的公钥der格式，通过od转换为可读的十六进制格式：

0x30,0x82,0x01,0x22,0x30,0x0d,0x06,0x09,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x01,0x01,0x01,0x05,0x00,0x03,0x82,0x01,0x0f,0x00,0x30,0x82,0x01,0x0a,0x02,0x82,0x01,0x01,0x00,0xd1,0xb0,0x86,0x57,0xbf,0xcb,0x8d,0xbe,0xb2,0x22,0xa7,0xe7,0x19,0xa6,0x97,0x4b,0x29,0x6c,0x17,0xf0,0x07,0x1a,0x26,0x00,0x97,0x18,0xf9,0xb2,0x8b,0x81,0x4e,0x26,0xbb,0x7c,0xfb,0xe3,0x3a,0x32,0xbe,0xec,0x52,0x45,0x36,0x61,0x91,0x9e,0xf3,0xd4,0x13,0x8c,0x2b,0x9a,0xae,0x92,0x3a,0x52,0x50,0x57,0x0a,0x76,0xf2,0xcc,0x23,0xdd,0xe1,0xbb,0x24,0xfe,0x48,0x4c,0x01,0xe6,0xb8,0x7d,0xfe,0xe7,0x5e,0xf0,0x4d,0xf4,0xbf,0xba,0xf7,0x5a,0x9f,0x47,0x00,0x7b,0x41,0x42,0x89,0x1f,0xda,0xa9,0x09,0xc2,0x90,0xac,0x95,0xdc,0xef,0xe1,0x64,0x11,0xac,0x87,0x15,0xbf,0x50,0xca,0x75,0xcb,0x91,0xc1,0x09,0x49,0xe3,0x3e,0x84,0x27,0xf2,0x8c,0x1a,0xff,0x55,0xbd,0xd5,0x4e,0x54,0x1e,0x8e,0x1c,0x17,0x8c,0xcb,0x3f,0x31,0x41,0x14,0x9d,0x8a,0x48,0x9b,0x8d,0xe6,0xff,0x07,0x89,0x0d,0x8a,0xcb,0x98,0xdf,0x4c,0x07,0x77,0x5b,0x5a,0x42,0xc2,0x20,0xf8,0x57,0x22,0x70,0xe8,0x8b,0x37,0xcc,0x96,0x9d,0x0a,0x46,0x81,0x0d,0xde,0xd4,0x04,0x54,0x80,0x95,0x70,0xdc,0xef,0x14,0xf6,0x5b,0x98,0xb7,0x27,0x50,0xde,0x9e,0xdd,0xa1,0x00,0x24,0xaf,0xfc,0xa5,0x02,0x32,0x03,0xb5,0x08,0x05,0xfd,0x07,0xdd,0xb0,0xb8,0x22,0x2a,0x39,0x5b,0xf7,0xc0,0x05,0x08,0x32,0xe7,0x4a,0xac,0x41,0x0c,0x41,0xb5,0x57,0x25,0x7c,0x3b,0x3a,0x95,0x8e,0x7d,0xb7,0x6d,0x24,0xf2,0x32,0xd4,0xbd,0xed,0xa4,0x9c,0xa1,0x7d,0x38,0x28,0x49,0x6b,0xf2,0xaa,0xf1,0xda,0x7f,0x02,0x03,0x01,0x00,0x01

我使用以下命令检查签名并返回成功：

openssl dgst -sha256 -verify public_key.der -signature signature.sig  plain.txt

已验证OK

到目前为止，它在用户空间中一直按预期工作，但是当到达内核空间时，它返回一个错误

以下是内核模块的关键代码：

static int _verify_signature_test(void) {
    //public key in der format
    static u8 _public_key_bytes[] = {0x30,0x82,0x01,0x22,0x30,0x0d,0x06,0x09,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x01,0x01,0x01,0x05,0x00,0x03,0x82,0x01,0x0f,0x00,0x30,0x82,0x01,0x0a,0x02,0x82,0x01,0x01,0x00,0xd1,0xb0,0x86,0x57,0xbf,0xcb,0x8d,0xbe,0xb2,0x22,0xa7,0xe7,0x19,0xa6,0x97,0x4b,0x29,0x6c,0x17,0xf0,0x07,0x1a,0x26,0x00,0x97,0x18,0xf9,0xb2,0x8b,0x81,0x4e,0x26,0xbb,0x7c,0xfb,0xe3,0x3a,0x32,0xbe,0xec,0x52,0x45,0x36,0x61,0x91,0x9e,0xf3,0xd4,0x13,0x8c,0x2b,0x9a,0xae,0x92,0x3a,0x52,0x50,0x57,0x0a,0x76,0xf2,0xcc,0x23,0xdd,0xe1,0xbb,0x24,0xfe,0x48,0x4c,0x01,0xe6,0xb8,0x7d,0xfe,0xe7,0x5e,0xf0,0x4d,0xf4,0xbf,0xba,0xf7,0x5a,0x9f,0x47,0x00,0x7b,0x41,0x42,0x89,0x1f,0xda,0xa9,0x09,0xc2,0x90,0xac,0x95,0xdc,0xef,0xe1,0x64,0x11,0xac,0x87,0x15,0xbf,0x50,0xca,0x75,0xcb,0x91,0xc1,0x09,0x49,0xe3,0x3e,0x84,0x27,0xf2,0x8c,0x1a,0xff,0x55,0xbd,0xd5,0x4e,0x54,0x1e,0x8e,0x1c,0x17,0x8c,0xcb,0x3f,0x31,0x41,0x14,0x9d,0x8a,0x48,0x9b,0x8d,0xe6,0xff,0x07,0x89,0x0d,0x8a,0xcb,0x98,0xdf,0x4c,0x07,0x77,0x5b,0x5a,0x42,0xc2,0x20,0xf8,0x57,0x22,0x70,0xe8,0x8b,0x37,0xcc,0x96,0x9d,0x0a,0x46,0x81,0x0d,0xde,0xd4,0x04,0x54,0x80,0x95,0x70,0xdc,0xef,0x14,0xf6,0x5b,0x98,0xb7,0x27,0x50,0xde,0x9e,0xdd,0xa1,0x00,0x24,0xaf,0xfc,0xa5,0x02,0x32,0x03,0xb5,0x08,0x05,0xfd,0x07,0xdd,0xb0,0xb8,0x22,0x2a,0x39,0x5b,0xf7,0xc0,0x05,0x08,0x32,0xe7,0x4a,0xac,0x41,0x0c,0x41,0xb5,0x57,0x25,0x7c,0x3b,0x3a,0x95,0x8e,0x7d,0xb7,0x6d,0x24,0xf2,0x32,0xd4,0xbd,0xed,0xa4,0x9c,0xa1,0x7d,0x38,0x28,0x49,0x6b,0xf2,0xaa,0xf1,0xda,0x7f,0x02,0x03,0x01,0x00,0x01};
    //SHA-256 digest for the data "123"
    static u8 _digest[] = {0xa6,0x65,0xa4,0x59,0x20,0x42,0x2f,0x9d,0x41,0x7e,0x48,0x67,0xef,0xdc,0x4f,0xb8,0xa0,0x4a,0x1f,0x3f,0xff,0x1f,0xa0,0x7e,0x99,0x8e,0x86,0xf7,0xf7,0xa2,0x7a,0xe3};
    //given signature of data "123" using a private key
    static u8 _sign[] = {0x1f,0x26,0x09,0xa3,0xad,0x91,0x3a,0xb1,0xd2,0x14,0x50,0x07,0x2d,0x98,0x5d,0x95,0xed,0x3f,0x02,0xd7,0x1c,0x83,0x74,0xa9,0x18,0x6a,0xe6,0x0f,0xd0,0xac,0x21,0x65,0xa9,0x78,0x1f,0x85,0x2c,0xc0,0xbe,0x5b,0xfe,0x7e,0x9a,0x7b,0x57,0xb1,0x4d,0xf6,0x0c,0x29,0xe5,0xea,0xd6,0x24,0x06,0xe5,0x6b,0x6c,0x7c,0x66,0x29,0xbd,0x9b,0x35,0x59,0x35,0xd4,0xf5,0x73,0xc0,0x7a,0xc1,0xc2,0xba,0xa5,0x43,0x2f,0xd1,0x25,0xcb,0xfe,0x32,0x91,0x5a,0x2b,0x9d,0xc2,0xa2,0x03,0x14,0x5f,0x70,0xc5,0x48,0x5f,0xb7,0xcf,0x0f,0x40,0xb2,0x8b,0xeb,0x16,0x39,0xfb,0x81,0xb5,0xb0,0xa9,0xb3,0xa7,0xf5,0x72,0x5d,0xb7,0xe1,0x24,0xa3,0xc4,0xcc,0x3e,0x7b,0x2b,0x09,0x56,0x0c,0xc5,0xc0,0xb0,0xb0,0x35,0xb4,0xff,0x74,0x58,0x6e,0xcb,0x2d,0x5b,0x4a,0x84,0x40,0x14,0xc5,0xc1,0x6a,0x69,0x0b,0xee,0x61,0x8c,0x42,0xfa,0xf3,0x5f,0xb0,0x49,0x68,0x05,0xb8,0x81,0xcc,0xf5,0x0f,0xfc,0x14,0x2b,0x1d,0x04,0x22,0xfa,0xa3,0x1c,0xfd,0x3a,0xc9,0xa3,0xe7,0xa3,0x5e,0xab,0x64,0x1c,0xac,0xd9,0x29,0x2e,0xf5,0x1c,0xc2,0x8e,0x8b,0xe4,0xb8,0xb1,0x00,0xc8,0xdd,0x8e,0x8f,0x22,0x93,0x71,0xe1,0x9d,0xe8,0x02,0x83,0x07,0x48,0x34,0x60,0x5a,0x1c,0x7c,0xa5,0x1e,0xa7,0x1c,0xfd,0xe2,0xa0,0xf7,0xc0,0xc4,0x66,0xa4,0xde,0xcd,0xda,0xf8,0xc8,0x89,0x07,0x56,0xf5,0xef,0xc6,0x12,0xd7,0xe4,0xa4,0xaa,0x18,0x70,0xeb,0x56,0xfc,0xdd,0xd6,0x0e,0x9a,0x68,0xdd,0x90,0x7b};
    struct public_key rsa_pub_key = {
        .key  = &_public_key_bytes[0],
        .keylen = (u32)(sizeof(_public_key_bytes)), //294
        .pkey_algo = "rsa",
        .id_type = "X509",
    };
    struct public_key_signature sig = {
        .s = _sign,
        .s_size = (u32)(sizeof(_sign)), //256
        .digest = _digest,
        .digest_size = (u32)(sizeof(_digest)), //32
        .pkey_algo = "rsa",
        .hash_algo = "sha256",
        .encoding = "pkcs1",
    };
    int ret = public_key_verify_signature(&rsa_pub_key,&sig);
    pr_alert("ret is %d",ret);
    return  ret;
}

public_key_verify_signature 始终返回 -74

#define EBADMSG     74  /* Not a data message */

我不确定问题是什么，任何帮助将不胜感激。

Answer 1

我自己解决了这个问题

是因为openssl命令生成的der文件不能直接使用，需要脱壳获取合适的偏移量。

为什么 public_key_verify_signature() 返回错误 -74？

问题描述投票：0回答：1

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最新问题

为什么 public_key_verify_signature() 返回错误 -74？

问题描述 投票：0回答：1

1个回答

最新问题

问题描述投票：0回答：1