SQL Server 未返回响应。连接已关闭。 ClientConnectionId:b7f61b1e-f98a-4f0f-9d8b-41c7b7e6f69c
时间: 2024-01-13 07:05:07 浏览: 57
这个错误信息 "SQL Server 未返回响应。连接已关闭。ClientConnectionId:b7f61b1e-f98a-4f0f-9d8b-41c7b7e6f69c" 表示在你的 SQL Server 连接中出现了问题,并且连接已经被关闭。这可能是由于各种原因引起的。
以下是一些可能的原因和解决方法:
1. 网络问题:检查网络连接是否正常,确保在客户端和 SQL Server 之间没有任何网络中断或防火墙阻止连接。
2. SQL Server 配置问题:确保 SQL Server 已正确配置以接受远程连接。检查 SQL Server 的网络配置和防火墙设置,确保已启用远程连接。
3. 连接字符串问题:检查你在连接字符串中使用的参数是否正确。特别注意服务器名称、端口和身份验证方式是否正确配置。
4. SQL Server 资源问题:如果 SQL Server 资源(如内存、CPU)不足,可能会导致连接关闭。检查服务器的资源使用情况,并确保它具有足够的资源来处理连接请求。
5. SQL Server 错误日志:查看 SQL Server 错误日志,以获取更详细的错误信息和相关提示。
如果问题仍然存在,建议在 SQL Server 技术支持论坛或社区中提问,并提供更多详细信息,以便其他人能够帮助你解决这个问题。
相关问题
用C语言写一个SHA-512加解密系统
SHA-512是一种安全哈希算法,用于产生消息摘要,不是加解密系统。下面是一个用C语言实现SHA-512算法的示例代码:
```c
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#define SHA512_BLOCK_SIZE 128
#define SHA512_DIGEST_SIZE 64
typedef struct SHA512_Context {
uint64_t state[8];
uint64_t bitcount[2];
uint8_t buffer[SHA512_BLOCK_SIZE];
} SHA512_Context;
static const uint64_t K[80] = {
0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
};
static const uint8_t padding[SHA512_BLOCK_SIZE] = {
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static void SHA512_Transform(SHA512_Context *ctx) {
uint64_t W[80];
uint64_t A, B, C, D, E, F, G, H, T1, T2;
int i;
for (i = 0; i < 16; i++) {
W[i] = ((uint64_t)ctx->buffer[i * 8 + 0] << 56) |
((uint64_t)ctx->buffer[i * 8 + 1] << 48) |
((uint64_t)ctx->buffer[i * 8 + 2] << 40) |
((uint64_t)ctx->buffer[i * 8 + 3] << 32) |
((uint64_t)ctx->buffer[i * 8 + 4] << 24) |
((uint64_t)ctx->buffer[i * 8 + 5] << 16) |
((uint64_t)ctx->buffer[i * 8 + 6] << 8) |
((uint64_t)ctx->buffer[i * 8 + 7] << 0);
}
for (i = 16; i < 80; i++) {
W[i] = W[i-16] + W[i-7] + (ROTR(W[i-15], 1) ^ ROTR(W[i-15], 8) ^ (W[i-15] >> 7)) + (ROTR(W[i-2], 19) ^ ROTR(W[i-2], 61) ^ (W[i-2] >> 6));
}
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
E = ctx->state[4];
F = ctx->state[5];
G = ctx->state[6];
H = ctx->state[7];
for (i = 0; i < 80; i++) {
T1 = H + (ROTR(E, 14) ^ ROTR(E, 18) ^ ROTR(E, 41)) + ((E & F) ^ (~E & G)) + K[i] + W[i];
T2 = (ROTR(A, 28) ^ ROTR(A, 34) ^ ROTR(A, 39)) + ((A & B) ^ (A & C) ^ (B & C));
H = G;
G = F;
F = E;
E = D + T1;
D = C;
C = B;
B = A;
A = T1 + T2;
}
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D;
ctx->state[4] += E;
ctx->state[5] += F;
ctx->state[6] += G;
ctx->state[7] += H;
}
void SHA512_Init(SHA512_Context *ctx) {
memset(ctx, 0, sizeof(*ctx));
ctx->state[0] = 0x6a09e667f3bcc908ULL;
ctx->state[1] = 0xbb67ae8584caa73bULL;
ctx->state[2] = 0x3c6ef372fe94f82bULL;
ctx->state[3] = 0xa54ff53a5f1d36f1ULL;
ctx->state[4] = 0x510e527fade682d1ULL;
ctx->state[5] = 0x9b05688c2b3e6c1fULL;
ctx->state[6] = 0x1f83d9abfb41bd6bULL;
ctx->state[7] = 0x5be0cd19137e2179ULL;
}
void SHA512_Update(SHA512_Context *ctx, const uint8_t *data, size_t len) {
size_t i;
for (i = 0; i < len; i++) {
ctx->buffer[ctx->bitcount[0] % SHA512_BLOCK_SIZE] = data[i];
ctx->bitcount[0] += 8;
if (ctx->bitcount[0] == 0) {
ctx->bitcount[1]++;
}
if (ctx->bitcount[0] % SHA512_BLOCK_SIZE == 0) {
SHA512_Transform(ctx);
}
}
}
void SHA512_Final(SHA512_Context *ctx, uint8_t *digest) {
uint64_t totalbits = ctx->bitcount[0] + (ctx->bitcount[1] << 32);
size_t padlen = SHA512_BLOCK_SIZE - (size_t)(ctx->bitcount[0] % SHA512_BLOCK_SIZE);
int i;
SHA512_Update(ctx, padding, padlen);
SHA512_Update(ctx, (uint8_t *)&totalbits, sizeof(totalbits));
for (i = 0; i < SHA512_DIGEST_SIZE / 8; i++) {
digest[i * 8 + 0] = (ctx->state[i] >> 56) & 0xff;
digest[i * 8 + 1] = (ctx->state[i] >> 48) & 0xff;
digest[i * 8 + 2] = (ctx->state[i] >> 40) & 0xff;
digest[i * 8 + 3] = (ctx->state[i] >> 32) & 0xff;
digest[i * 8 + 4] = (ctx->state[i] >> 24) & 0xff;
digest[i * 8 + 5] = (ctx->state[i] >> 16) & 0xff;
digest[i * 8 + 6] = (ctx->state[i] >> 8) & 0xff;
digest[i * 8 + 7] = (ctx->state[i] >> 0) & 0xff;
}
}
int main() {
SHA512_Context ctx;
uint8_t digest[SHA512_DIGEST_SIZE];
char message[] = "Hello, world!";
size_t len = strlen(message);
SHA512_Init(&ctx);
SHA512_Update(&ctx, (uint8_t *)message, len);
SHA512_Final(&ctx, digest);
int i;
for (i = 0; i < SHA512_DIGEST_SIZE; i++) {
printf("%02x", digest[i]);
}
printf("\n");
return 0;
}
```
该代码可以计算输入消息的SHA-512哈希值。要使用该代码,可以将要计算哈希值的消息存储在一个字符串中,然后调用`SHA512_Init`、`SHA512_Update`和`SHA512_Final`函数。最终的哈希值将存储在一个64字节的缓冲区中。
汇编代码实现HMAC-SHA256算法
根据提供的引用内容,HMAC-SHA256算法需要使用密钥生成函数HKDF_SHA256和SHA256哈希函数。由于汇编语言的实现方式与不同的处理器架构有关,因此下面提供的是x86架构下的汇编代码实现HMAC-SHA256算法的示例。
```assembly
section .data
key db 'mykey' ; 密钥
key_len equ $-key ; 密钥长度
message db 'mymessage' ; 消息
message_len equ $-message ; 消息长度
section .text
global _start
; 定义SHA256哈希函数
sha256:
; 参数:eax - 指向消息的指针,ebx - 消息长度,ecx - 指向哈希值的指针
; 返回值:无
push ebx ; 保存消息长度
push ecx ; 保存哈希值指针
push eax ; 保存消息指针
mov eax, 0x67452301
mov ebx, 0xEFCDAB89
mov ecx, 0x98BADCFE
mov edx, 0x10325476
; 填充消息
mov esi, eax
mov edi, [esp+8] ; 消息指针
mov ecx, ebx
mov edx, ecx
add edx, eax
mov ebx, edx
mov edx, 0xC3D2E1F0
mov ebp, 0x80
mov [edi+ebx], byte 0x80
mov ebx, 0
mov ecx, ebp
sub ecx, ebx
cmp ecx, 0x40
jbe .Lpad
mov ecx, 0x40
.Lpad:
xor eax, eax
rep stosb
; 处理消息
mov eax, esi
mov ebx, [esp+4] ; 消息长度
mov ecx, 0
mov edx, 0
.Lloop:
mov esi, eax
mov edi, [esp+8] ; 哈希值指针
mov ebp, ecx
mov ebx, edx
add ebx, 0x10
cmp ebx, ebx
jbe .Lend
mov ebx, ebx
sub ebx, edx
cmp ebx, 0x40
jbe .Lend
mov ebx, 0x40
.Lend:
mov edx, ebx
mov ebx, eax
add eax, edx
push edi
push ebp
push esi
push ebx
call sha256_block
add esp, 16
add ecx, 0x40
cmp ecx, [esp+4] ; 消息长度
jb .Lloop
; 输出哈希值
pop eax ; 恢复消息指针
pop ecx ; 恢复哈希值指针
pop ebx ; 恢复消息长度
ret
; 定义SHA256哈希函数的内部块处理函数
sha256_block:
; 参数:eax - 指向消息块的指针,ebx - 指向哈希值的指针,ecx - 消息长度,edx - 哈希值长度
; 返回值:无
push ebp ; 保存ebp
mov ebp, esp ; 设置ebp
sub esp, 0x20 ; 分配栈空间
push ebx ; 保存哈希值指针
push esi ; 保存消息块指针
push edi ; 保存消息长度
push ebp ; 保存ebp
mov ebp, esp ; 设置ebp
; 初始化变量
mov esi, [ebp+0x10] ; 消息块指针
mov edi, [ebp+0x8] ; 哈希值指针
mov ebx, [edi]
mov ecx, [edi+4]
mov edx, [edi+8]
mov eax, [edi+12]
mov ebp, [edi+16]
mov esi, [edi+20]
mov edi, [edi+24]
; 处理消息块
mov ebp, 0x428A2F98
mov edx, [esi]
mov eax, [esi+4]
mov ebx, [esi+8]
mov ecx, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ebx
mov [ebp-0x4], ecx
mov ebx, 0x71374491
mov edx, [esi]
mov eax, [esi+4]
mov ecx, [esi+8]
mov ebp, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ecx
mov [ebp-0x4], ebp
mov ebp, 0xB5C0FBCF
mov edx, [esi]
mov eax, [esi+4]
mov ebx, [esi+8]
mov ecx, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ebx
mov [ebp-0x4], ecx
mov ebx, 0xE9B5DBA5
mov edx, [esi]
mov eax, [esi+4]
mov ecx, [esi+8]
mov ebp, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ecx
mov [ebp-0x4], ebp
mov ebp, 0x3956C25B
mov edx, [esi]
mov eax, [esi+4]
mov ebx, [esi+8]
mov ecx, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ebx
mov [ebp-0x4], ecx
mov ebx, 0x59F111F1
mov edx, [esi]
mov eax, [esi+4]
mov ecx, [esi+8]
mov ebp, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ecx
mov [ebp-0x4], ebp
mov ebp, 0x923F82A4
mov edx, [esi]
mov eax, [esi+4]
mov ebx, [esi+8]
mov ecx, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ebx
mov [ebp-0x4], ecx
mov ebx, 0xAB1C5ED5
mov edx, [esi]
mov eax, [esi+4]
mov ecx, [esi+8]
mov ebp, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ecx
mov [ebp-0x4], ebp
mov ebp, 0xD807AA98
mov edx, [esi]
mov eax, [esi+4]
mov ebx, [esi+8]
mov ecx, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ebx
mov [ebp-0x4], ecx
mov ebx, 0x12835B01
mov edx, [esi]
mov eax, [esi+4]
mov ecx, [esi+8]
mov ebp, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ecx
mov [ebp-0x4], ebp
mov ebp, 0x243185BE
mov edx, [esi]
mov eax, [esi+4]
mov ebx, [esi+8]
mov ecx, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ebx
mov [ebp-0x4], ecx
mov ebx, 0x550C7DC3
mov edx, [esi]
mov eax, [esi+4]
mov ecx, [esi+8]
mov ebp, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ecx
mov [ebp-0x4], ebp
mov ebp, 0x72BE5D74
mov edx, [esi]
mov eax, [esi+4]
mov ebx, [esi+8]
mov ecx, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ebx
mov [ebp-0x4], ecx
mov ebx, 0x80DEB1FE
mov edx, [esi]
mov eax, [esi+4]
mov ecx, [esi+8]
mov ebp, [esi+12]
add esi, 0x10
mov [ebp-0x10], edx
mov [ebp-0xC], eax
mov [ebp-0x8], ecx
mov [ebp-0x4], ebp
; 更新哈希值
mov edx, [edi]
add [ebp-0x10], edx
mov eax, [edi+4]
adc [ebp-0xC], eax
mov ebx, [edi+8]
adc [ebp-0x8], ebx
mov ecx, [edi+12]
adc [ebp-0x4], ecx
mov edx, [edi+16]
adc [ebp+0], edx
mov eax, [edi+20]
adc [ebp+4], eax
mov ebx, [edi+24]
adc [ebp+8], ebx
mov ecx, [edi+28]
adc [ebp+0xC], ecx
; 输出哈希值
pop ebp ; 恢复ebp
pop edi ; 恢复消息长度
pop esi ; 恢复消息块指针
pop ebx ; 恢复哈希值指针
add esp, 0x20 ; 释放栈空间
ret
; 定义HMAC-SHA256算法
hmac_sha256:
; 参数:eax - 指向密钥的指针,ebx - 密钥长度,ecx - 指向消息的指针,edx - 消息长度,esi - 指向哈希值的指针
; 返回值:无
push ebp ; 保存ebp
mov ebp, esp ; 设置ebp
sub esp, 0x20 ; 分配栈空间
push esi ; 保存哈希值指针
push edi ; 保存密钥指针
push ebp ; 保存ebp
mov ebp, esp ; 设置ebp
; 计算内部密钥
mov esi, [ebp+0x10] ; 消息指针
mov edi, [ebp+0x8] ; 密钥指针
mov ebx, [ebp+0x14] ; 密钥长度
cmp ebx, 0x40
jbe .Lkeypad
push ebx
push edi
call sha256
add esp, 8
mov edi, eax
mov ebx, 0x20
jmp .Lkeydone
.Lkeypad:
mov ecx, 0x40
sub ecx, ebx
mov edx, ecx
mov eax, ebx
mov esi, 0x36
rep stosb
mov ecx, ebx
mov esi, [ebp+0x8] ; 密钥指针
add esi, ebx
mov edx, 0x40
sub edx, ebx
mov eax, edx
mov edi, esp
rep movsb
push edx
push esp
call sha256
add esp, 8
mov edi, eax
mov ebx, 0x20
.Lkeydone:
; 计算外部密钥
mov esi, [ebp+0x10] ; 消息指针
mov ebx, [ebp+0x14] ; 消息长度
mov edx, 0x40
sub edx, ebx
mov eax, edx
mov edi, esp
rep movsb