user: 请从给定的汇编指令推导出C源代码：

```asm
<PKCS5_pbkdf2_set>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %edi,-0x34(%rbp)
  mov    %rsi,-0x40(%rbp)
  mov    %edx,-0x38(%rbp)
  mov    %ecx,-0x44(%rbp)
  mov    %r8d,-0x48(%rbp)
  movq   $0x0,-0x28(%rbp)
  movq   $0x0,-0x20(%rbp)
  movq   $0x0,-0x18(%rbp)
  mov    $0x0,%eax
  call   <PBKDF2PARAM_new@plt>
  mov    %rax,-0x20(%rbp)
  cmpq   $0x0,-0x20(%rbp)
  je     L118
  mov    $0x0,%eax
  call   <ASN1_OCTET_STRING_new@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  je     L200
  mov    -0x20(%rbp),%rax
  mov    0x10(%rax),%rax
  mov    -0x18(%rbp),%rdx
  mov    %rdx,0x8(%rax)
  mov    -0x20(%rbp),%rax
  mov    0x10(%rax),%rax
  mov    D80(%rip),%rdx
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  cmpl   $0x0,-0x38(%rbp)
  jne    L97
  mov    D28(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,-0x38(%rbp)
L97:
  mov    -0x38(%rbp),%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    -0x18(%rbp),%rdx
  mov    %eax,0x4(%rdx)
  mov    -0x18(%rbp),%rax
  mov    0x4(%rax),%eax
  test   %eax,%eax
  je     L231
  mov    -0x18(%rbp),%rax
  mov    -0x38(%rbp),%edx
  mov    %edx,(%rax)
  cmpq   $0x0,-0x40(%rbp)
  je     L246
  mov    -0x18(%rbp),%rax
  mov    0x4(%rax),%eax
  mov    -0x38(%rbp),%edx
  mov    -0x40(%rbp),%rcx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <memcpy@plt>
  jmp    L83
L246:
  mov    -0x18(%rbp),%rax
  mov    0x4(%rax),%eax
  mov    -0x38(%rbp),%edx
  mov    %edx,%esi
  mov    %eax,%edi
  call   <arc4random_buf@plt>
L83:
  cmpl   $0x0,-0x34(%rbp)
  jg     L264
  mov    D67(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,-0x34(%rbp)
L264:
  mov    -0x20(%rbp),%rax
  mov    0xc(%rax),%eax
  mov    -0x34(%rbp),%edx
  mov    %edx,%esi
  mov    %eax,%edi
  call   <ASN1_INTEGER_set@plt>
  test   %eax,%eax
  je     L13
  cmpl   $0x0,-0x48(%rbp)
  jle    L36
  mov    $0x0,%eax
  call   <ASN1_INTEGER_new@plt>
  mov    -0x20(%rbp),%rdx
  mov    %eax,0x8(%rdx)
  mov    -0x20(%rbp),%rax
  mov    0x8(%rax),%eax
  test   %eax,%eax
  je     L42
  mov    -0x20(%rbp),%rax
  mov    0x8(%rax),%eax
  mov    -0x48(%rbp),%edx
  mov    %edx,%esi
  mov    %eax,%edi
  call   <ASN1_INTEGER_set@plt>
  test   %eax,%eax
  je     L72
L36:
  cmpl   $0x0,-0x44(%rbp)
  jle    L96
  mov    D78(%rip),%rax
  mov    (%rax),%eax
  cmp    %eax,-0x44(%rbp)
  je     L96
  mov    $0x0,%eax
  call   <X509_ALGOR_new@plt>
  mov    -0x20(%rbp),%rdx
  mov    %rax,(%rdx)
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  test   %rax,%rax
  je     L166
  mov    D17(%rip),%rax
  mov    (%rax),%ebx
  mov    -0x44(%rbp),%eax
  mov    %eax,%edi
  call   <OBJ_nid2obj@plt>
  mov    %eax,%esi
  mov    -0x20(%rbp),%rax
  mov    (%rax),%rax
  mov    $0x0,%ecx
  mov    %ebx,%edx
  mov    %rax,%rdi
  call   <X509_ALGOR_set0@plt>
L96:
  mov    $0x0,%eax
  call   <X509_ALGOR_new@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  je     L15
  mov    D2(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,%edi
  call   <OBJ_nid2obj@plt>
  mov    -0x28(%rbp),%rdx
  mov    %eax,0x8(%rdx)
  mov    $0x0,%eax
  call   <ASN1_TYPE_new@plt>
  mov    -0x28(%rbp),%rdx
  mov    %rax,(%rdx)
  mov    -0x28(%rbp),%rax
  mov    (%rax),%rax
  test   %rax,%rax
  je     L161
  mov    -0x28(%rbp),%rax
  mov    (%rax),%rax
  lea    0x4(%rax),%rdx
  mov    -0x20(%rbp),%rax
  mov    D50(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <ASN1_item_pack@plt>
  test   %eax,%eax
  je     L31
  mov    -0x28(%rbp),%rax
  mov    (%rax),%rax
  mov    D66(%rip),%rdx
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <PBKDF2PARAM_free@plt>
  mov    -0x28(%rbp),%rax
  jmp    L8
L118:
  nop
  jmp    L248
L200:
  nop
  jmp    L248
L231:
  nop
  jmp    L248
L13:
  nop
  jmp    L248
L42:
  nop
  jmp    L248
L72:
  nop
  jmp    L248
L166:
  nop
  jmp    L248
L15:
  nop
  jmp    L248
L161:
  nop
  jmp    L248
L31:
  nop
L248:
  mov    D55(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,%edi
  call   <ASN1error@plt>
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <PBKDF2PARAM_free@plt>
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <X509_ALGOR_free@plt>
  mov    $0x0,%eax
L8:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen, int prf_nid, int keylen) {
  X509_ALGOR *keyfunc = NULL;
  PBKDF2PARAM *kdf = NULL;
  ASN1_OCTET_STRING *osalt = NULL;
  if (!(kdf = PBKDF2PARAM_new()))
    goto merr;
  if (!(osalt = ASN1_OCTET_STRING_new()))
    goto merr;
  kdf->salt->value.octet_string = osalt;
  kdf->salt->type = V_ASN1_OCTET_STRING;
  if (!saltlen)
    saltlen = PKCS5_SALT_LEN;
  if (!(osalt->data = malloc(saltlen)))
    goto merr;
  osalt->length = saltlen;
  if (salt)
    memcpy(osalt->data, salt, saltlen);
  else
    arc4random_buf(osalt->data, saltlen);
  if (iter <= 0)
    iter = PKCS5_DEFAULT_ITER;
  if (!ASN1_INTEGER_set(kdf->iter, iter))
    goto merr;
  if (keylen > 0) {
    if (!(kdf->keylength = ASN1_INTEGER_new()))
      goto merr;
    if (!ASN1_INTEGER_set(kdf->keylength, keylen))
      goto merr;
  }
  if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) {
    kdf->prf = X509_ALGOR_new();
    if (!kdf->prf)
      goto merr;
    X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL);
  }
  keyfunc = X509_ALGOR_new();
  if (!keyfunc)
    goto merr;
  keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
  if (!(keyfunc->parameter = ASN1_TYPE_new()))
    goto merr;
  if (!ASN1_item_pack(kdf, &PBKDF2PARAM_it, &keyfunc->parameter->value.sequence))
    goto merr;
  keyfunc->parameter->type = V_ASN1_SEQUENCE;
  PBKDF2PARAM_free(kdf);
  return keyfunc;
merr:
  ASN1error(ERR_R_MALLOC_FAILURE);
  PBKDF2PARAM_free(kdf);
  X509_ALGOR_free(keyfunc);
  return NULL;
}
```