user: 下面的汇编指令对应的C源代码是什么：

```asm
<des_cipher>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %edx,-0x34(%rbp)
  mov    %ecx,-0x38(%rbp)
  mov    %r8,-0x40(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    -0x28(%rbp),%rax
  add    $0x3,%rax
  movzbl (%rax),%eax
  movzbl %al,%edx
  mov    -0x28(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x8,%eax
  or     %eax,%edx
  mov    -0x28(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x10,%eax
  or     %eax,%edx
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x18,%eax
  or     %edx,%eax
  mov    %eax,-0x10(%rbp)
  mov    -0x28(%rbp),%rax
  add    $0x7,%rax
  movzbl (%rax),%eax
  movzbl %al,%edx
  mov    -0x28(%rbp),%rax
  add    $0x6,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x8,%eax
  or     %eax,%edx
  mov    -0x28(%rbp),%rax
  add    $0x5,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x10,%eax
  or     %eax,%edx
  mov    -0x28(%rbp),%rax
  add    $0x4,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  shl    $0x18,%eax
  or     %edx,%eax
  mov    %eax,-0xc(%rbp)
  mov    -0x38(%rbp),%r8d
  mov    -0x34(%rbp),%edi
  lea    -0x14(%rbp),%rcx
  lea    -0x18(%rbp),%rdx
  mov    -0xc(%rbp),%esi
  mov    -0x10(%rbp),%eax
  sub    $0x8,%rsp
  push   -0x40(%rbp)
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <do_des@plt>
  add    $0x10,%rsp
  mov    -0x18(%rbp),%eax
  sar    $0x18,%eax
  mov    %eax,%edx
  mov    -0x30(%rbp),%rax
  mov    %dl,(%rax)
  mov    -0x18(%rbp),%eax
  sar    $0x10,%eax
  mov    %eax,%edx
  mov    -0x30(%rbp),%rax
  add    $0x1,%rax
  mov    %dl,(%rax)
  mov    -0x18(%rbp),%eax
  sar    $0x8,%eax
  mov    %eax,%edx
  mov    -0x30(%rbp),%rax
  add    $0x2,%rax
  mov    %dl,(%rax)
  mov    -0x18(%rbp),%edx
  mov    -0x30(%rbp),%rax
  add    $0x3,%rax
  mov    %dl,(%rax)
  mov    -0x14(%rbp),%eax
  sar    $0x18,%eax
  mov    %eax,%edx
  mov    -0x30(%rbp),%rax
  add    $0x4,%rax
  mov    %dl,(%rax)
  mov    -0x14(%rbp),%eax
  sar    $0x10,%eax
  mov    %eax,%edx
  mov    -0x30(%rbp),%rax
  add    $0x5,%rax
  mov    %dl,(%rax)
  mov    -0x14(%rbp),%eax
  sar    $0x8,%eax
  mov    %eax,%edx
  mov    -0x30(%rbp),%rax
  add    $0x6,%rax
  mov    %dl,(%rax)
  mov    -0x14(%rbp),%edx
  mov    -0x30(%rbp),%rax
  add    $0x7,%rax
  mov    %dl,(%rax)
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L6
  call   <__stack_chk_fail@plt>
L6:
  leave
  ret
```

assistant: ```c
void des_cipher(const unsigned char *in, unsigned char *out, uint32_t count, uint32_t saltbits, const struct expanded_key *ekey) {
  uint32_t l_out, r_out, rawl, rawr;
  rawl = (uint32_t)in[3] | ((uint32_t)in[2] << 8) | ((uint32_t)in[1] << 16) | ((uint32_t)in[0] << 24);
  rawr = (uint32_t)in[7] | ((uint32_t)in[6] << 8) | ((uint32_t)in[5] << 16) | ((uint32_t)in[4] << 24);
  do_des(rawl, rawr, &l_out, &r_out, count, saltbits, ekey);
  out[0] = l_out >> 24;
  out[1] = l_out >> 16;
  out[2] = l_out >> 8;
  out[3] = l_out;
  out[4] = r_out >> 24;
  out[5] = r_out >> 16;
  out[6] = r_out >> 8;
  out[7] = r_out;
}
```