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#include "decryptbuf.ih"
DecryptBuf::DecryptBuf(ostream &outStream, char const *type,
string key, string iv, size_t bufsize)
:
d_pimpl(new DecryptBufImp(outStream, bufsize))
{
try
{
OpenSSL_add_all_ciphers();
d_pimpl->md = EVP_get_cipherbyname(type);
if (!d_pimpl->md)
{
if (type == 0)
type = "** unspecified cipher type **";
throw Errno(1, "DecryptBuf `") << insertable << type <<
"' not available" << throwable;
}
size_t keyLength = key.length();
if (keyLength > EVP_MAX_KEY_LENGTH)
keyLength = EVP_MAX_KEY_LENGTH;
key.resize(EVP_MAX_KEY_LENGTH);
iv.resize(EVP_MAX_IV_LENGTH);
EVP_CIPHER_CTX_init(&d_pimpl->ctx);
if
(
!EVP_DecryptInit_ex(&d_pimpl->ctx, d_pimpl->md, 0,
0, // no key yet, is entered next
reinterpret_cast<unsigned char const *>(iv.data()))
)
throw Errno(1, "DecryptBuf: initialization failed");
installKey(key, keyLength);
d_pimpl->buffer = new char[bufsize];
d_pimpl->out = new char[
bufsize + EVP_CIPHER_CTX_block_size(&d_pimpl->ctx)];
open();
}
catch (...)
{
delete d_pimpl;
throw;
}
}
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