python ECDSA和C micro-ecc库之间的ECDSA签名和验证问题

时间:2019-05-15 05:22:33

标签: python c cryptography public-key-encryption ecdsa

执行以下操作时遇到问题:

  1. 使用python创建ECDSA SECP256k1曲线的公共私钥对,并将其打印在终端上。
  2. 将密钥对复制粘贴到Python脚本和Visual Studio(使用micro-ecc库的C编码)中。这样我每次运行代码时就不会生成新密钥。
  3. 使用私钥在Python中签名消息(“ Hello”),并在终端上打印签名和消息。我知道必须先使用标准哈希算法(例如SHA256)对消息进行哈希处理,但是在这种情况下,我将直接使用消息进行签名。
  4. 将签名和相同的消息(哈希)复制到Visual Studio中。
  5. 当我在Visual Studio中调用verify API时,尽管验证使用了相同的公钥,消息,签名和曲线,但验证全部失败。

我正在使用的图书馆:

  1. Visual Studio https://github.com/kmackay/micro-ecc中用于C的micro-ecc
  2. 适用于python https://github.com/warner/python-ecdsa的ECDSA

我已经测试并确保的其他事项:

  1. 对于相同的密钥对(sk,vk),在python中签名和验证都可以正常工作。
  2. 对于相同的密钥对(sk,vk),在Visual Studio中签名和验证都可以正常工作。
  3. 在Visual Studio中使用microECC签名并在python中使用ECDSA进行验证失败,也在ECDSA中签名并使用microECC在中进行验证失败。
  4. 我确信从终端粘贴的密钥实际上是预期的密钥,因为我已经从复制的签名密钥中对验证密钥进行了交叉验证,并且该密钥是匹配的。

首先,我通过运行此脚本来生成密钥

GenerateKeys.py

import ecdsa
from ecdsa import SigningKey, SECP256k1


sk  = ecdsa.SigningKey.generate(curve=ecdsa.SECP256k1) 
vk  = sk.get_verifying_key()

sklst = []
for e in bytearray(sk.to_string()):
    sklst.append(e)

vklst = []
for e in bytearray(vk.to_string()):
    vklst.append(e)

print("Private Key is:")
print(sklst)

print("Public Key is:")
print(vklst)

GenerateKeys.py的输出

Private Key is:
[38, 108, 90, 112, 230, 138, 62, 97, 107, 90, 227, 165, 207, 80, 251, 154, 17, 4, 73, 53, 33, 162, 33, 200, 243, 205, 116, 43, 36, 59, 201, 84]
Public Key is:
[163, 238, 83, 33, 229, 249, 105, 12, 141, 7, 214, 134, 148, 1, 198, 45, 13, 31, 9, 223, 85, 201, 98, 248, 73, 160, 40, 255, 64, 214, 250, 121, 234, 103, 212, 148, 197, 48, 210, 38, 166, 51, 30, 81, 119, 240, 125, 104, 237, 24, 3, 216, 229, 87, 45, 7, 115, 69, 94, 187, 236, 91, 142, 18]

复制将私钥粘贴到Sign.py python脚本中,并生成签名和公钥 我已经使用“ Hello”作为用于创建签名的消息

Sign.py

import ecdsa
from ecdsa import SigningKey, SECP256k1


signinKey_lst = [38, 108, 90, 112, 230, 138, 62, 97, 107, 90, 227, 165, 207, 80, 251, 154, 17, 4, 73, 53, 33, 162, 33, 200, 243, 205, 116, 43, 36, 59, 201, 84]
signinKey_lst = bytearray(signinKey_lst)
signinKey = ecdsa.SigningKey.from_string(signinKey_lst, curve=ecdsa.SECP256k1)
verifyKey = signinKey.get_verifying_key()

signinKey_lst = []
for e in bytearray(signinKey.to_string()):
    signinKey_lst.append(e)

verifyKey_lst = []
for e in bytearray(verifyKey.to_string()):
    verifyKey_lst.append(e)

print("Public Key is:")
print(verifyKey_lst)

msg = "Hello"

sign = signinKey.sign(msg)
sign_lst = []

verifyKey_lst = []
for e in bytearray(sign):
    sign_lst.append(e)

print("Signature is:")
print(sign_lst)

Sign.py的输出:

Private Key is:
[38, 108, 90, 112, 230, 138, 62, 97, 107, 90, 227, 165, 207, 80, 251, 154, 17, 4, 73, 53, 33, 162, 33, 200, 243, 205, 116, 43, 36, 59, 201, 84]
Public Key is:
[163, 238, 83, 33, 229, 249, 105, 12, 141, 7, 214, 134, 148, 1, 198, 45, 13, 31, 9, 223, 85, 201, 98, 248, 73, 160, 40, 255, 64, 214, 250, 121, 234, 103, 212, 148, 197, 48, 210, 38, 166, 51, 30, 81, 119, 240, 125, 104, 237, 24, 3, 216, 229, 87, 45, 7, 115, 69, 94, 187, 236, 91, 142, 18]
Signature is:
[47, 107, 101, 228, 187, 209, 97, 180, 83, 149, 133, 71, 62, 15, 86, 186, 192, 222, 108, 221, 249, 128, 124, 7, 139, 110, 103, 108, 62, 89, 136, 152, 226, 43, 104, 166, 92, 247, 9, 201, 135, 96, 19, 75, 55, 229, 67, 198, 188, 90, 246, 17, 157, 1, 229, 71, 151, 206, 211, 95, 41, 51, 96, 42]

复制粘贴签名,并在带有Micro ecc库的Visual Studio中使用相同的消息:-

source.c

#include "stdio.h"
#include <stdlib.h>
#include <string.h>
#include "uECC.h"
#include "constants.h"

uint8_t privateKey[32] = { 0 };
uint8_t publicKey[64] = { 163, 238, 83, 33, 229, 249, 105, 12, 141, 7, 214, 134, 148, 1, 198, 45, 13, 31, 9, 223, 85, 201, 98, 248, 73, 160, 40, 255, 64, 214, 250, 121, 234, 103, 212, 148, 197, 48, 210, 38, 166, 51, 30, 81, 119, 240, 125, 104, 237, 24, 3, 216, 229, 87, 45, 7, 115, 69, 94, 187, 236, 91, 142, 18 };
uint8_t msg[5] = { 'H','e','l','l','o' };
uint8_t sign[64] = { 47, 107, 101, 228, 187, 209, 97, 180, 83, 149, 133, 71, 62, 15, 86, 186, 192, 222, 108, 221, 249, 128, 124, 7, 139, 110, 103, 108, 62, 89, 136, 152, 226, 43, 104, 166, 92, 247, 9, 201, 135, 96, 19, 75, 55, 229, 67, 198, 188, 90, 246, 17, 157, 1, 229, 71, 151, 206, 211, 95, 41, 51, 96, 42 };

void printArray(uint8_t* pToArr, uint32_t u16ArrSize)
{
    uint32_t c = 0;
    printf("[ ");
    for (c = 0; c < u16ArrSize; c++)
    {
        if (c != (u16ArrSize - 1))
        {
            printf(" %u,", *pToArr);
        }
        else
        {
            printf(" %u", *pToArr);
        }
        pToArr++;
    }
    printf(" ]");
    return;
}

int main()
{
    const struct uECC_Curve_t* curve;
    #if uECC_SUPPORTS_secp256k1
    curve = uECC_secp256k1();
    #endif

    const char* m = "Hello World"; //{0xff, 0xff, 0xff, 0xff, 0xff,0xff }

    printf("\n/*************************************************************************************************\n");
    printf("Validating the Encrypted hash with the public key and the hash used\n");

    printf("\n\nPublic Key:\n");
    printArray(publicKey, sizeof(publicKey));

    printf("\n\nMsg:\n");
    printArray(msg, sizeof(msg));

    printf("\n\nsignature:\n");
    printArray(sign, sizeof(sign));

    printf("\n");
    if (!uECC_verify(publicKey, msg, sizeof(msg), sign, curve))
    {
        printf("\nuECC_verify() failed\n");
    }
    else
    {
        printf("\nuECC_verify() succeeded\n");

    }
    printf("\n/*************************************************************************************************/\n");
    return 0;
}

通过运行source.c输出Visual Studio:-

/*************************************************************************************************
Validating the Encrypted hash with the public key and the hash used


Public Key:
[  148, 49, 144, 80, 185, 77, 185, 14, 186, 168, 164, 110, 123, 192, 55, 219, 184, 133, 153, 65, 144, 169, 175, 171, 203, 225, 88, 134, 51, 199, 254, 215, 237, 144, 141, 137, 80, 190, 25, 35, 33, 136, 248, 190, 114, 60, 128, 34, 155, 157, 83, 68, 187, 154, 137, 9, 51, 112, 155, 54, 88, 104, 82, 138 ]

Msg:
[  72, 101, 108, 108, 111 ]

signature:
[  186, 247, 43, 62, 152, 84, 40, 197, 74, 135, 80, 18, 152, 150, 121, 177, 155, 242, 1, 11, 171, 155, 45, 19, 174, 171, 190, 66, 31, 125, 214, 136, 41, 116, 139, 82, 71, 208, 4, 80, 47, 154, 100, 173, 110, 164, 25, 19, 7, 253, 175, 123, 34, 1, 99, 86, 241, 241, 211, 45, 15, 35, 210, 69 ]

uECC_verify() failed

/*************************************************************************************************/

C:\Users\prajwal.bv\source\repos\Crypt_sample1\x64\Debug\Crypt_sample1.exe (process 17160) exited with code 0.
To automatically close the console when debugging stops, enable Tools->Options->Debugging->Automatically close the console when debugging stops.
Press any key to close this window . . .

我希望运行source.c的输出成功完成uECC_verify()。但是它打印uECC_verify()失败。

1 个答案:

答案 0 :(得分:2)

ECDSA签名过程分为两个阶段:

  • 根据消息计算出哈希摘要
  • 然后对该摘要进行签名。

除非另有说明,否则默认情况下,Python ECDSA默认使用SHA-1。

消息“ Hello”的SHA-1摘要采用十六进制编码:f7ff9e8b7bb2e09b70935a5d785e0cc5d9d0abf0

这意味着您在调用uECC_verify函数时需要使用此摘要。

验证

在.c代码中用以下代码行替换msg数组:

uint8_t msg[] = { 0xf7, 0xff, 0x9e, 0x8b, 0x7b, 0xb2, 0xe0, 0x9b, 0x70, 0x93, 0x5a, 0x5d, 0x78, 0x5e, 0x0c, 0xc5, 0xd9, 0xd0, 0xab, 0xf0};

然后验证功能成功。

输出

调试控制台中的输出如下所示:

uECC_verify output