user: Translate the below assembly code into C programming language:

```asm
<do_step_G>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %rdx,-0x58(%rbp)
  mov    %rcx,-0x60(%rbp)
  mov    %r8d,-0x64(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  cmpl   $0x0,-0x64(%rbp)
  je     L60
  mov    -0x50(%rbp),%rax
  mov    %rax,-0x20(%rbp)
  mov    $0x10,%edi
  call   <log2@plt>
  mov    $0x1,%edx
  mov    %eax,%ecx
  shl    %cl,%edx
  mov    %edx,%eax
  lea    -0x1(%rax),%ebx
  mov    $0x10,%edi
  call   <log2@plt>
  imul   -0x64(%rbp),%eax
  mov    %eax,%ecx
  shl    %cl,%ebx
  mov    %ebx,%eax
  mov    %eax,-0x28(%rbp)
  mov    $0x10,%edi
  call   <log2@plt>
  imul   -0x64(%rbp),%eax
  mov    $0x4,%edx
  mov    %eax,%ecx
  shl    %cl,%edx
  mov    %edx,%eax
  mov    %eax,-0x24(%rbp)
  movl   $0x0,-0x2c(%rbp)
  jmp    L2
L57:
  movl   $0x0,-0x34(%rbp)
  mov    -0x2c(%rbp),%eax
  shl    $0x2,%eax
  mov    %eax,-0x30(%rbp)
  jmp    L35
L37:
  mov    -0x30(%rbp),%edx
  mov    -0x58(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x20(%rbp),%rax
  mov    $0x4,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  addq   $0x4,-0x20(%rbp)
  addl   $0x1,-0x34(%rbp)
  mov    -0x24(%rbp),%eax
  add    %eax,-0x30(%rbp)
L35:
  cmpl   $0xf,-0x34(%rbp)
  jbe    L37
  mov    -0x2c(%rbp),%eax
  or     -0x28(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    -0x28(%rbp),%eax
  not    %eax
  and    %edx,%eax
  mov    %eax,-0x2c(%rbp)
L2:
  mov    $0x1000,%edi
  call   <log2@plt>
  mov    $0x1,%edx
  mov    %eax,%ecx
  shl    %cl,%edx
  mov    %edx,%eax
  cmp    %eax,-0x2c(%rbp)
  jb     L57
  jmp    L77
L60:
  mov    -0x58(%rbp),%rax
  mov    %rax,-0x50(%rbp)
L77:
  movl   $0x0,-0x38(%rbp)
  jmp    L82
L46:
  mov    $0x0,%eax
  call   <EVP_sha512@plt>
  mov    %eax,%ecx
  mov    -0x48(%rbp),%rax
  mov    $0x0,%edx
  mov    %ecx,%esi
  mov    %rax,%rdi
  call   <EVP_DigestInit_ex@plt>
  mov    -0x38(%rbp),%edx
  mov    -0x50(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x48(%rbp),%rax
  mov    $0x40,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <EVP_DigestUpdate@plt>
  mov    -0x38(%rbp),%edx
  mov    -0x60(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  lea    -0x3c(%rbp),%rdx
  mov    -0x48(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <EVP_DigestFinal_ex@plt>
  addl   $0x40,-0x38(%rbp)
L82:
  cmpl   $0x3fff,-0x38(%rbp)
  jbe    L46
  nop
  mov    -0x18(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L78
  call   <__stack_chk_fail@plt>
L78:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
void do_step_G(EVP_MD_CTX *ctx, unsigned char *buffer, const unsigned char *macro, unsigned char *gout, const unsigned int step) {
  unsigned int outl, off;
  if (step) {
    unsigned int j, off, mask, start, dist;
    unsigned char *bp = buffer;
    mask = ((1 << ((int)log2((64 / 4)))) - 1) << (step * ((int)log2((64 / 4))));
    dist = (1 << (step * ((int)log2((64 / 4))))) * 4;
    for (start = 0; start < (1 << ((int)log2(4096))); start = ((start | mask) + 1) & ~mask) {
      for (j = 0, off = start * 4; j < (64 / 4); ++j, off += dist) {
        memcpy(bp, macro + off, 4);
        bp += 4;
      }
    };
  } else {
    buffer = (unsigned char *)macro;
  }
  for (off = 0; off < (4 * 4096); off += 64) {
    EVP_DigestInit_ex(ctx, EVP_sha512(), NULL);
    EVP_DigestUpdate(ctx, buffer + off, 64);
    EVP_DigestFinal_ex(ctx, gout + off, &outl);
    if (0)
      assert(64 == outl);
  }
}
```