Method decrypt

src/client/FSCrypt.cc:657–695

}   

int FSCryptDenc::decrypt(const char *in_data, int in_len,
                         char *out_data, int out_len)
{
  int total_len;

  if ((int)key.size() != key_size) {
    ldout(cct, 0) << "ERROR: unexpected encryption key size: " << key.size() << " (expected: " << key_size << ")" << dendl;
    return -EINVAL;
  }

  if ((uint64_t)out_len < (fscrypt_align_ofs(in_len))) {
    ldout(cct, 0) << __FILE__ << ":" << __LINE__ << dendl;
    return -ERANGE;
  }

  if (!EVP_CipherInit_ex2(cipher_ctx, cipher, (const uint8_t *)key.data(), iv.raw,
                          0, cipher_params.data())) {
    ldout(cct, 0) << __FILE__ << ":" << __LINE__ << dendl;
    return -EINVAL;
  }

  int len;

  if (EVP_DecryptUpdate(cipher_ctx, (uint8_t *)out_data, &len, (const uint8_t *)in_data, in_len) != 1) {
    ldout(cct, 0) << __FILE__ << ":" << __LINE__ << dendl;
    return -EINVAL;
  }

  total_len = len;

    int ret = EVP_DecryptFinal_ex(cipher_ctx, (uint8_t *)out_data + len, &len);
    if (ret != 1) {
      return -EINVAL;
    }

    total_len += len;

    return total_len;
}

int FSCryptDenc::encrypt(const char *in_data, int in_len,
                         char *out_data, int out_len)