本文整理汇总了C++中OTPayload::GetPointer方法的典型用法代码示例。如果您正苦于以下问题：C++ OTPayload::GetPointer方法的具体用法？C++ OTPayload::GetPointer怎么用？C++ OTPayload::GetPointer使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类OTPayload的用法示例。
在下文中一共展示了OTPayload::GetPointer方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: Decrypt
//.........这里部分代码省略.........
if (2 != env_type)
{
const uint32_t l_env_type = static_cast<uint32_t>(env_type);
OTLog::vError("%s: Error: Expected Envelope for Symmetric key (type 2) but instead found type: %ld.\n",
szFunc, l_env_type);
return false;
}
// ****************************************************************************
//
// Read network-order IV size (and convert to host version)
//
const uint32_t max_iv_length = OTCryptoConfig::SymmetricIvSize(); // I believe this is a max length, so it may not match the actual length of the IV.
// Read the IV SIZE (network order version -- convert to host version.)
//
uint32_t iv_size_n = 0;
if (0 == (nRead = m_dataContents.OTfread(reinterpret_cast<uint8_t*>(&iv_size_n),
static_cast<uint32_t>(sizeof(iv_size_n)))))
{
OTLog::vError("%s: Error reading IV Size.\n", szFunc);
return false;
}
nRunningTotal += nRead;
OT_ASSERT(nRead == static_cast<uint32_t>(sizeof(iv_size_n)));
// ----------------------------------------------------------------------------
// convert that iv size from network to HOST endian.
//
const uint32_t iv_size_host_order = ntohl(iv_size_n);
if (iv_size_host_order > max_iv_length)
{
OTLog::vError("%s: Error: iv_size (%ld) is larger than max_iv_length (%ld).\n",
szFunc, static_cast<long>(iv_size_host_order), static_cast<long>(max_iv_length));
return false;
}
// nRunningTotal += iv_size_host_order; // Nope!
// ****************************************************************************
//
// Then read the IV (initialization vector) itself.
//
OTPayload theIV;
theIV.SetPayloadSize(iv_size_host_order);
if (0 == (nRead = m_dataContents.OTfread(static_cast<uint8_t*>(const_cast<void *>(theIV.GetPayloadPointer())),
static_cast<uint32_t>(iv_size_host_order))))
{
OTLog::vError("%s: Error reading initialization vector.\n", szFunc);
return false;
}
nRunningTotal += nRead;
OT_ASSERT(nRead == static_cast<uint32_t>(iv_size_host_order));
OT_ASSERT(nRead <= max_iv_length);
// ----------------------------------------------------------------------------
// We create an OTPayload object to store the ciphertext itself, which begins AFTER the end of the IV.
// So we see pointer + nRunningTotal as the starting point for the ciphertext.
// the size of the ciphertext, meanwhile, is the size of the entire thing, MINUS nRunningTotal.
//
OTPayload theCipherText(static_cast<const void*>(
static_cast<const uint8_t *>(m_dataContents.GetPointer()) + nRunningTotal
),
m_dataContents.GetSize() - nRunningTotal);
// ----------------------------------------------------------------------------
// Now we've got all the pieces together, let's try to decrypt it...
//
OTPayload thePlaintext; // for output.
const bool bDecrypted = OTCrypto::It()->Decrypt(theRawSymmetricKey, // The symmetric key, in clear form.
// -------------------------------
static_cast<const char *>(theCipherText.GetPayloadPointer()), // This is the Ciphertext.
theCipherText.GetSize(),
// -------------------------------
theIV,
// -------------------------------
thePlaintext); // OUTPUT. (Recovered plaintext.) You can pass OTPassword& OR OTPayload& here (either will work.)
// -----------------------------------------------
// theOutput is where we'll put the decrypted data.
//
theOutput.Release();
if (bDecrypted)
{
// -----------------------------------------------------
// Make sure it's null-terminated...
//
uint32_t nIndex = thePlaintext.GetSize()-1;
(static_cast<uint8_t*>(const_cast<void *>(thePlaintext.GetPointer())))[nIndex] = '\0';
// -----------------------------------------------------
// Set it into theOutput (to return the plaintext to the caller)
//
theOutput.Set(static_cast<const char *>(thePlaintext.GetPointer()));
// ----------------
}
return bDecrypted;
}