user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<pcaNegCrypt>:
  endbr64
  push   %rbx
  sub    $0x20,%rsp
  mov    %edi,%ebx
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  movabs $0xfe000900616f,%rax
  mov    %rax,0xa(%rsp)
  movl   $0xffff,0x12(%rsp)
  movw   $0x0,0x16(%rsp)
  movl   $0x0,0x4(%rsp)
  lea    D45(%rip),%rdx
  lea    D88(%rip),%rsi
  mov    $0xa,%edi
  call   <writeError@plt>
  lea    0xa(%rsp),%rsi
  mov    $0x0,%ecx
  mov    $0xe,%edx
  mov    %ebx,%edi
  call   <medusaSend@plt>
  test   %rax,%rax
  js     L41
  movl   $0x0,0x4(%rsp)
  lea    0x4(%rsp),%rsi
  mov    %ebx,%edi
  call   <medusaReceiveRaw@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L6
  lea    0x1c(%rax),%rdi
  lea    D43(%rip),%rsi
  call   <strstr@plt>
  test   %rax,%rax
  jne    L33
  mov    %rbx,%rdi
  call   <free@plt>
  mov    $0x0,%eax
L22:
  mov    0x18(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L25
  add    $0x20,%rsp
  pop    %rbx
  ret
L41:
  lea    D45(%rip),%rdx
  lea    D63(%rip),%rsi
  mov    $0x3,%edi
  call   <writeError@plt>
  mov    $0xffffffff,%eax
  jmp    L22
L6:
  lea    D45(%rip),%rdx
  lea    D80(%rip),%rsi
  mov    $0x3,%edi
  call   <writeError@plt>
  mov    $0xffffffff,%eax
  jmp    L22
L33:
  lea    D45(%rip),%rdx
  lea    D2(%rip),%rsi
  mov    $0x3,%edi
  call   <writeError@plt>
  mov    %rbx,%rdi
  call   <free@plt>
  mov    $0xffffffff,%eax
  jmp    L22
L25:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: data_tag: D45
data_type: string
name: disassemble_data
arguments: data_tag: D88
data_type: string
name: disassemble_data
arguments: data_tag: D43
data_type: string
name: disassemble_data
arguments: data_tag: D63
data_type: string
name: disassemble_data
arguments: data_tag: D80
data_type: string
name: disassemble_data
arguments: data_tag: D2
data_type: string

tool: D45: pcanywhere.mod

tool: D88: %s: Checking encryption level.

tool: D43: Host is denying connection

tool: D63: %s failed: medusaSend was not successful

tool: D80: %s failed: medusaReceive returned no data.

tool: D2: %s: PcAnywhere host denied connection. Host requires encryption which is currently not supported.

assistant: ```c
int pcaNegCrypt(int hSocket) {
  unsigned char bufSend[] = {0x6f, 0x61, 0x00, 0x09, 0x00, 0xfe, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00};
  int nSendBufferSize = 14;
  unsigned char *bufReceive;
  int nReceiveBufferSize = 0;
  writeError(10, "%s: Checking encryption level.", "pcanywhere.mod");
  if (medusaSend(hSocket, bufSend, nSendBufferSize, 0) < 0) {
    writeError(3, "%s failed: medusaSend was not successful", "pcanywhere.mod");
    return -1;
  }
  nReceiveBufferSize = 0;
  bufReceive = medusaReceiveRaw(hSocket, &nReceiveBufferSize);
  if (bufReceive == NULL) {
    writeError(3, "%s failed: medusaReceive returned no data.", "pcanywhere.mod");
    return -1;
  } else if (strstr((char *)bufReceive + 28, "Host is denying connection")) {
    writeError(3, "%s: PcAnywhere host denied connection. Host requires encryption which is currently not supported.", "pcanywhere.mod");
    if (bufReceive != NULL) {
      free(bufReceive);
      bufReceive = NULL;
    };
    return -1;
  }
  if (bufReceive != NULL) {
    free(bufReceive);
    bufReceive = NULL;
  };
  return 0;
}
```