user: 请从给定的汇编指令推导出C源代码:

```asm
<sha1>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xa0,%rsp
  mov    %rdi,-0x88(%rbp)
  mov    %esi,%eax
  mov    %rdx,-0x98(%rbp)
  mov    %al,-0x8c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movabs $0x89abcdef01234567,%rax
  movabs $0x76543210fedcba98,%rdx
  mov    %rax,-0x70(%rbp)
  mov    %rdx,-0x68(%rbp)
  movl   $0xf0e1d2c3,-0x60(%rbp)
  movb   $0x0,-0x76(%rbp)
  movb   $0x0,-0x75(%rbp)
  movb   $0x0,-0x74(%rbp)
  movb   $0x0,-0x73(%rbp)
  jmp    L15
L122:
  movzbl -0x73(%rbp),%edx
  mov    -0x88(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  movzbl -0x74(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %dl,-0x74(%rbp)
  movzbl %al,%eax
  movzbl (%rcx),%edx
  cltq
  mov    %dl,-0x50(%rbp,%rax,1)
  addb   $0x8,-0x76(%rbp)
  cmpb   $0x0,-0x76(%rbp)
  jne    L60
  movzbl -0x75(%rbp),%eax
  add    $0x1,%eax
  mov    %al,-0x75(%rbp)
L60:
  cmpb   $0x40,-0x74(%rbp)
  jne    L96
  lea    -0x50(%rbp),%rdx
  mov    -0x98(%rbp),%rcx
  lea    -0x70(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <processBlock@plt>
  movb   $0x0,-0x72(%rbp)
  jmp    L54
L82:
  movzbl -0x72(%rbp),%edx
  mov    -0x98(%rbp),%rax
  add    %rax,%rdx
  movzbl -0x72(%rbp),%eax
  movzbl (%rdx),%edx
  cltq
  mov    %dl,-0x70(%rbp,%rax,1)
  movzbl -0x72(%rbp),%eax
  add    $0x1,%eax
  mov    %al,-0x72(%rbp)
L54:
  cmpb   $0x13,-0x72(%rbp)
  jbe    L82
  movb   $0x0,-0x74(%rbp)
L96:
  movzbl -0x73(%rbp),%eax
  add    $0x1,%eax
  mov    %al,-0x73(%rbp)
L15:
  movzbl -0x73(%rbp),%eax
  cmp    -0x8c(%rbp),%al
  jb     L122
  movzbl -0x74(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %dl,-0x74(%rbp)
  movzbl %al,%eax
  cltq
  movb   $0x80,-0x50(%rbp,%rax,1)
  cmpb   $0x37,-0x74(%rbp)
  jbe    L69
  jmp    L138
L68:
  movzbl -0x74(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %dl,-0x74(%rbp)
  movzbl %al,%eax
  cltq
  movb   $0x0,-0x50(%rbp,%rax,1)
L138:
  cmpb   $0x3f,-0x74(%rbp)
  jbe    L68
  lea    -0x50(%rbp),%rdx
  mov    -0x98(%rbp),%rcx
  lea    -0x70(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <processBlock@plt>
  movb   $0x0,-0x71(%rbp)
  jmp    L124
L26:
  movzbl -0x71(%rbp),%edx
  mov    -0x98(%rbp),%rax
  add    %rax,%rdx
  movzbl -0x71(%rbp),%eax
  movzbl (%rdx),%edx
  cltq
  mov    %dl,-0x70(%rbp,%rax,1)
  movzbl -0x71(%rbp),%eax
  add    $0x1,%eax
  mov    %al,-0x71(%rbp)
L124:
  cmpb   $0x13,-0x71(%rbp)
  jbe    L26
  movb   $0x0,-0x74(%rbp)
  jmp    L69
L103:
  movzbl -0x74(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %dl,-0x74(%rbp)
  movzbl %al,%eax
  cltq
  movb   $0x0,-0x50(%rbp,%rax,1)
L69:
  cmpb   $0x3d,-0x74(%rbp)
  jbe    L103
  movzbl -0x75(%rbp),%eax
  mov    %al,-0x12(%rbp)
  movzbl -0x76(%rbp),%eax
  mov    %al,-0x11(%rbp)
  lea    -0x50(%rbp),%rdx
  mov    -0x98(%rbp),%rcx
  lea    -0x70(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <processBlock@plt>
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L6
  call   <__stack_chk_fail@plt>
L6:
  leave
  ret
```

assistant: ```c
void sha1(const unsigned char message[], unsigned char length, unsigned char out[]) {
  unsigned char old[] = {0x67, 0x45, 0x23, 0x01, 0xEF, 0xCD, 0xAB, 0x89, 0x98, 0xBA, 0xDC, 0xFE, 0x10, 0x32, 0x54, 0x76, 0xC3, 0xD2, 0xE1, 0xF0};
  unsigned char lenght_low = 0;
  unsigned char lenght_high = 0;
  unsigned char index = 0;
  unsigned char message_block[64];
  for (unsigned char i = 0; i < length; i++) {
    message_block[index++] = message[i];
    lenght_low += 8;
    if (lenght_low == 0) {
      lenght_high++;
    }
    if (index == 64) {
      processBlock(old, out, message_block);
      for (unsigned char i = 0; i < 20; i++) {
        old[i] = out[i];
      }
      index = 0;
    }
  }
  message_block[index++] = 0x80;
  if (index > 55) {
    while (index < 64) {
      message_block[index++] = 0;
    }
    processBlock(old, out, message_block);
    for (unsigned char i = 0; i < 20; i++) {
      old[i] = out[i];
    }
    index = 0;
  }
  while (index < 62) {
    message_block[index++] = 0;
  }
  message_block[62] = lenght_high;
  message_block[63] = lenght_low;
  processBlock(old, out, message_block);
}
```