user: Please show me the C implementation that matches the assembly code listed below:

```asm
<RSA_padding_check_X931>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %ecx,-0x30(%rbp)
  mov    %r8d,-0x3c(%rbp)
  movl   $0x0,-0x10(%rbp)
  mov    -0x38(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x3c(%rbp),%eax
  cmp    -0x30(%rbp),%eax
  jne    L113
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x6a,%al
  je     L34
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x6b,%al
  je     L34
L113:
  mov    D37(%rip),%rax
  mov    (%rax),%edx
  mov    D16(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <RSAerr@plt>
  mov    $0xffffffff,%eax
  jmp    L70
L34:
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movzbl (%rax),%eax
  cmp    $0x6b,%al
  jne    L7
  mov    -0x30(%rbp),%eax
  sub    $0x3,%eax
  mov    %eax,-0xc(%rbp)
  movl   $0x0,-0x10(%rbp)
  jmp    L8
L35:
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x11(%rbp)
  cmpb   $0xba,-0x11(%rbp)
  je     L114
  cmpb   $0xbb,-0x11(%rbp)
  je     L108
  mov    D7(%rip),%rax
  mov    (%rax),%edx
  mov    D16(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <RSAerr@plt>
  mov    $0xffffffff,%eax
  jmp    L70
L108:
  addl   $0x1,-0x10(%rbp)
L8:
  mov    -0x10(%rbp),%eax
  cmp    -0xc(%rbp),%eax
  jl     L35
  jmp    L9
L114:
  nop
L9:
  mov    -0x10(%rbp),%eax
  sub    %eax,-0xc(%rbp)
  cmpl   $0x0,-0x10(%rbp)
  jne    L56
  mov    D7(%rip),%rax
  mov    (%rax),%edx
  mov    D16(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <RSAerr@plt>
  mov    $0xffffffff,%eax
  jmp    L70
L7:
  mov    -0x30(%rbp),%eax
  sub    $0x2,%eax
  mov    %eax,-0xc(%rbp)
L56:
  mov    -0xc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0xcc,%al
  je     L3
  mov    D42(%rip),%rax
  mov    (%rax),%edx
  mov    D16(%rip),%rax
  mov    (%rax),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <RSAerr@plt>
  mov    $0xffffffff,%eax
  jmp    L70
L3:
  mov    -0xc(%rbp),%edx
  mov    -0x8(%rbp),%rcx
  mov    -0x28(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0xc(%rbp),%eax
L70:
  leave
  ret
```

assistant: ```c
int RSA_padding_check_X931(unsigned char *to, int tlen, const unsigned char *from, int flen, int num) {
  int i = 0, j;
  const unsigned char *p;
  p = from;
  if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B))) {
    RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_HEADER);
    return -1;
  }
  if (*p++ == 0x6B) {
    j = flen - 3;
    for (i = 0; i < j; i++) {
      unsigned char c = *p++;
      if (c == 0xBA)
        break;
      if (c != 0xBB) {
        RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING);
        return -1;
      }
    }
    j -= i;
    if (i == 0) {
      RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING);
      return -1;
    }
  } else
    j = flen - 2;
  if (p[j] != 0xCC) {
    RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_TRAILER);
    return -1;
  }
  memcpy(to, p, (unsigned int)j);
  return (j);
}
```