Hash加密方法

最新推荐文章于 2025-01-03 00:15:00 发布

一只小菜鸟-BIOS

最新推荐文章于 2025-01-03 00:15:00 发布

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文章标签：哈希算法算法

本文链接：https://blog.youkuaiyun.com/qq_43561214/article/details/136192268

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文章详细介绍了如何在C语言中通过源码实现SHA256哈希算法，同时给出了Python中使用hashlib库进行密码哈希的示例，展示了哈希函数在密码安全中的应用。

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源码实现SHA256

extern char* StrSHA256(const char* str, long long length, char* sha256){
    /*
    计算字符串SHA-256
    参数说明：
    str         字符串指针
    length      字符串长度
    sha256         用于保存SHA-256的字符串指针
    返回值为参数sha256
    */
    char *pp, *ppend;
    long l, i, W[64], T1, T2, A, B, C, D, E, F, G, H, H0, H1, H2, H3, H4, H5, H6, H7;
    H0 = 0x6a09e667, H1 = 0xbb67ae85, H2 = 0x3c6ef372, H3 = 0xa54ff53a;
    H4 = 0x510e527f, H5 = 0x9b05688c, H6 = 0x1f83d9ab, H7 = 0x5be0cd19;
    long K[64] = {
            0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
            0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
            0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
            0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
            0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
            0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
            0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
            0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
    };
    l = length + ((length % 64 >= 56) ? (128 - length % 64) : (64 - length % 64));
    if (!(pp = (char*)malloc((unsigned long)l))) return 0;
    for (i = 0; i < length; pp[i + 3 - 2 * (i % 4)] = str[i], i++);
    for (pp[i + 3 - 2 * (i % 4)] = 128, i++; i < l; pp[i + 3 - 2 * (i % 4)] = 0, i++);
    *((long*)(pp + l - 4)) = length << 3;
    *((long*)(pp + l - 8)) = length >> 29;
    for (ppend = pp + l; pp < ppend; pp += 64){
        for (i = 0; i < 16; W[i] = ((long*)pp)[i], i++);
        for (i = 16; i < 64; W[i] = (SHA256_O1(W[i - 2]) + W[i - 7] + SHA256_O0(W[i - 15]) + W[i - 16]), i++);
        A = H0, B = H1, C = H2, D = H3, E = H4, F = H5, G = H6, H = H7;
        for (i = 0; i < 64; i++){
            T1 = H + SHA256_E1(E) + SHA256_Ch(E, F, G) + K[i] + W[i];
            T2 = SHA256_E0(A) + SHA256_Maj(A, B, C);
            H = G, G = F, F = E, E = D + T1, D = C, C = B, B = A, A = T1 + T2;
        }
        H0 += A, H1 += B, H2 += C, H3 += D, H4 += E, H5 += F, H6 += G, H7 += H;
    }
    //free(pp - l);
    sprintf(sha256, "%08X%08X%08X%08X%08X%08X%08X%08X", (unsigned int)H0, (unsigned int)H1, (unsigned int)H2, (unsigned int)H3, (unsigned int)H4, (unsigned int)H5,(unsigned int) H6,(unsigned int) H7);
    return sha256;
}

结果测试：

Python代码

importhashlib

defhash_password(password):
#使用SHA256算法对密码进行哈希运算
hashed_password=hashlib.sha256(password.encode()).hexdigest()
returnhashed_password

defcompare_password(input_password,hashed_password):
#对输入密码进行哈希运算，并与已加密的密码进行比较
input_hashed_password=hash_password(input_password)
returninput_hashed_password==hashed_password

#示例用法
password=input("请输入密码:")
hashed_password=hash_password(password)
print("加密后的密码:",hashed_password)

input_password=input("请再次输入密码进行比较:")
ifcompare_password(input_password,hashed_password):
print("密码匹配")
else:
print("密码不匹配")

测试结果：