user: Demonstrate the C code that generates the assembly output below:

```asm
<Decrypt>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x58,%rsp
  mov    %rdi,%r13
  mov    %rsi,%r14
  mov    %fs:0x28,%rax
  mov    %rax,0x48(%rsp)
  xor    %eax,%eax
  jmp    L62
L9:
  mov    %eax,%ecx
  sar    $0x1f,%ecx
  shr    $0x1e,%ecx
  lea    (%rax,%rcx,1),%edx
  and    $0x3,%edx
  sub    %ecx,%edx
  movslq %edx,%rdx
  lea    0x3(%rax),%ecx
  test   %eax,%eax
  cmovns %eax,%ecx
  sar    $0x2,%ecx
  movslq %ecx,%rcx
  lea    (%rdx,%rcx,4),%rcx
  mov    %eax,%edx
  sar    %edx
  movslq %edx,%rdx
  mov    0x0(%r13,%rdx,4),%edx
  sar    $0x4,%edx
  and    $0xf,%edx
  mov    %edx,(%rsp,%rcx,4)
L33:
  add    $0x1,%eax
  cmp    $0x10,%eax
  je     L51
L62:
  test   $0x1,%al
  je     L9
  mov    %eax,%ecx
  sar    $0x1f,%ecx
  shr    $0x1e,%ecx
  lea    (%rax,%rcx,1),%edx
  and    $0x3,%edx
  sub    %ecx,%edx
  movslq %edx,%rdx
  lea    0x3(%rax),%ecx
  test   %eax,%eax
  cmovns %eax,%ecx
  sar    $0x2,%ecx
  movslq %ecx,%rcx
  lea    (%rdx,%rcx,4),%rcx
  mov    %eax,%edx
  sar    %edx
  movslq %edx,%rdx
  mov    0x0(%r13,%rdx,4),%edx
  and    $0xf,%edx
  mov    %edx,(%rsp,%rcx,4)
  jmp    L33
L51:
  mov    $0x2b,%r15d
  mov    $0xc,%r12d
  mov    %rsp,%rbp
  jmp    L17
L84:
  sub    $0x4,%r15d
  sub    $0x1,%r12d
  je     L60
L17:
  mov    %r12d,%edx
  mov    %r14,%rsi
  mov    %rbp,%rdi
  call   <AddKey@plt>
  lea    0x4(%r15),%ebx
L47:
  mov    %rbp,%rdi
  call   <invSCShRMCS@plt>
  mov    %ebx,%esi
  mov    %rbp,%rdi
  call   <AddConstants@plt>
  sub    $0x1,%ebx
  cmp    %r15d,%ebx
  jne    L47
  jmp    L84
L60:
  mov    %rsp,%rdi
  mov    $0x0,%edx
  mov    %r14,%rsi
  call   <AddKey@plt>
  mov    $0x0,%ecx
L31:
  lea    0x1(%r12),%esi
  mov    %r12d,%edx
  sar    $0x1f,%edx
  shr    $0x1e,%edx
  lea    (%r12,%rdx,1),%eax
  and    $0x3,%eax
  sub    %edx,%eax
  cltq
  mov    %ecx,%edx
  shr    $0x1f,%edx
  add    %ecx,%edx
  sar    %edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%rax
  mov    (%rsp,%rax,4),%eax
  shl    $0x4,%eax
  movzbl %al,%edi
  mov    %esi,%edx
  sar    $0x1f,%edx
  shr    $0x1e,%edx
  lea    (%rsi,%rdx,1),%eax
  and    $0x3,%eax
  sub    %edx,%eax
  cltq
  lea    0x4(%r12),%edx
  test   %esi,%esi
  cmovns %esi,%edx
  sar    $0x2,%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%rax
  mov    (%rsp,%rax,4),%eax
  and    $0xf,%eax
  or     %edi,%eax
  mov    %eax,0x0(%r13,%rcx,4)
  add    $0x1,%rcx
  add    $0x2,%r12d
  cmp    $0x8,%rcx
  jne    L31
  mov    0x48(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L45
  add    $0x58,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L45:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void Decrypt(uint8_t *block, uint8_t *keyBytes) {
  int8_t i, j;
  uint8_t state[4][4];
  for (i = 0; i < 16; i++) {
    if (i % 2) {
      state[i / 4][i % 4] = block[i >> 1] & 0xF;
    } else {
      state[i / 4][i % 4] = (block[i >> 1] >> 4) & 0xF;
    }
  }
  for (i = (48 >> 2) - 1; i >= 0; i--) {
    AddKey(state, keyBytes, i + 1);
    for (j = 3; j >= 0; j--) {
      invSCShRMCS(state);
      AddConstants(state, i * 4 + j);
    }
  }
  AddKey(state, keyBytes, 0);
  for (i = 0; i < 8; i++) {
    block[i] = ((state[(2 * i) / 4][(2 * i) % 4] & 0xF) << 4) | (state[(2 * i + 1) / 4][(2 * i + 1) % 4] & 0xF);
  }
}
```