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#include <qpdf/QPDFCrypto_openssl.hh>
#include <cstring>
#include <stdexcept>
#include <string>
#if (defined(__GNUC__) || defined(__clang__))
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wold-style-cast"
#endif
#include <openssl/err.h>
#ifndef QPDF_OPENSSL_1
# include <openssl/provider.h>
#endif
#if (defined(__GNUC__) || defined(__clang__))
# pragma GCC diagnostic pop
#endif
#include <qpdf/QIntC.hh>
static void
bad_bits(int bits)
{
throw std::logic_error(
std::string("unsupported key length: ") + std::to_string(bits));
}
static void
check_openssl(int status)
{
if (status != 1) {
// OpenSSL creates a "queue" of errors; copy the first (innermost)
// error to the exception message.
char buf[256] = "";
ERR_error_string_n(ERR_get_error(), buf, sizeof(buf));
std::string what = "OpenSSL error: ";
what += buf;
throw std::runtime_error(what);
}
ERR_clear_error();
}
QPDFCrypto_openssl::QPDFCrypto_openssl() :
#ifdef QPDF_OPENSSL_1
rc4(EVP_rc4()),
#endif
md_ctx(EVP_MD_CTX_new()),
cipher_ctx(EVP_CIPHER_CTX_new())
{
#ifndef QPDF_OPENSSL_1
libctx = OSSL_LIB_CTX_new();
if (libctx == nullptr) {
throw std::runtime_error("unable to create openssl library context");
return;
}
legacy = OSSL_PROVIDER_load(libctx, "legacy");
if (legacy == nullptr) {
OSSL_LIB_CTX_free(libctx);
throw std::runtime_error("unable to load openssl legacy provider");
return;
}
rc4 = EVP_CIPHER_fetch(libctx, "RC4", nullptr);
if (rc4 == nullptr) {
OSSL_PROVIDER_unload(legacy);
OSSL_LIB_CTX_free(libctx);
throw std::runtime_error("unable to load openssl rc4 algorithm");
return;
}
#endif
memset(md_out, 0, sizeof(md_out));
EVP_MD_CTX_init(md_ctx);
EVP_CIPHER_CTX_init(cipher_ctx);
}
QPDFCrypto_openssl::~QPDFCrypto_openssl()
{
EVP_MD_CTX_reset(md_ctx);
EVP_CIPHER_CTX_reset(cipher_ctx);
EVP_CIPHER_CTX_free(cipher_ctx);
#ifndef QPDF_OPENSSL_1
EVP_CIPHER_free(rc4);
OSSL_PROVIDER_unload(legacy);
OSSL_LIB_CTX_free(libctx);
#endif
EVP_MD_CTX_free(md_ctx);
}
void
QPDFCrypto_openssl::provideRandomData(unsigned char* data, size_t len)
{
check_openssl(RAND_bytes(data, QIntC::to_int(len)));
}
void
QPDFCrypto_openssl::MD5_init()
{
check_openssl(EVP_MD_CTX_reset(md_ctx));
check_openssl(EVP_DigestInit_ex(md_ctx, EVP_md5(), nullptr));
}
void
QPDFCrypto_openssl::SHA2_init(int bits)
{
const EVP_MD* md = EVP_sha512();
switch (bits) {
case 256:
md = EVP_sha256();
break;
case 384:
md = EVP_sha384();
break;
case 512:
md = EVP_sha512();
break;
default:
bad_bits(bits);
return;
}
sha2_bits = static_cast<size_t>(bits);
check_openssl(EVP_MD_CTX_reset(md_ctx));
check_openssl(EVP_DigestInit_ex(md_ctx, md, nullptr));
}
void
QPDFCrypto_openssl::MD5_update(unsigned char const* data, size_t len)
{
check_openssl(EVP_DigestUpdate(md_ctx, data, len));
}
void
QPDFCrypto_openssl::SHA2_update(unsigned char const* data, size_t len)
{
check_openssl(EVP_DigestUpdate(md_ctx, data, len));
}
void
QPDFCrypto_openssl::MD5_finalize()
{
#ifdef QPDF_OPENSSL_1
auto md = EVP_MD_CTX_md(md_ctx);
#else
auto md = EVP_MD_CTX_get0_md(md_ctx);
#endif
if (md) {
check_openssl(EVP_DigestFinal(md_ctx, md_out + 0, nullptr));
}
}
void
QPDFCrypto_openssl::SHA2_finalize()
{
#ifdef QPDF_OPENSSL_1
auto md = EVP_MD_CTX_md(md_ctx);
#else
auto md = EVP_MD_CTX_get0_md(md_ctx);
#endif
if (md) {
check_openssl(EVP_DigestFinal(md_ctx, md_out + 0, nullptr));
}
}
void
QPDFCrypto_openssl::MD5_digest(MD5_Digest d)
{
memcpy(d, md_out, sizeof(QPDFCryptoImpl::MD5_Digest));
}
std::string
QPDFCrypto_openssl::SHA2_digest()
{
return std::string(reinterpret_cast<char*>(md_out), sha2_bits / 8);
}
void
QPDFCrypto_openssl::RC4_init(unsigned char const* key_data, int key_len)
{
check_openssl(EVP_CIPHER_CTX_reset(cipher_ctx));
if (key_len == -1) {
key_len =
QIntC::to_int(strlen(reinterpret_cast<const char*>(key_data)));
}
check_openssl(
EVP_EncryptInit_ex(cipher_ctx, rc4, nullptr, nullptr, nullptr));
check_openssl(EVP_CIPHER_CTX_set_key_length(cipher_ctx, key_len));
check_openssl(
EVP_EncryptInit_ex(cipher_ctx, nullptr, nullptr, key_data, nullptr));
}
void
QPDFCrypto_openssl::rijndael_init(
bool encrypt,
unsigned char const* key_data,
size_t key_len,
bool cbc_mode,
unsigned char* cbc_block)
{
const EVP_CIPHER* cipher = nullptr;
switch (key_len) {
case 32:
cipher = cbc_mode ? EVP_aes_256_cbc() : EVP_aes_256_ecb();
break;
case 24:
cipher = cbc_mode ? EVP_aes_192_cbc() : EVP_aes_192_ecb();
break;
default:
cipher = cbc_mode ? EVP_aes_128_cbc() : EVP_aes_128_ecb();
break;
}
check_openssl(EVP_CIPHER_CTX_reset(cipher_ctx));
check_openssl(
// line-break
EVP_CipherInit_ex(
cipher_ctx, cipher, nullptr, key_data, cbc_block, encrypt));
check_openssl(EVP_CIPHER_CTX_set_padding(cipher_ctx, 0));
}
void
QPDFCrypto_openssl::RC4_process(
unsigned char const* in_data, size_t len, unsigned char* out_data)
{
int out_len = static_cast<int>(len);
check_openssl(
EVP_EncryptUpdate(cipher_ctx, out_data, &out_len, in_data, out_len));
}
void
QPDFCrypto_openssl::rijndael_process(
unsigned char* in_data, unsigned char* out_data)
{
int len = QPDFCryptoImpl::rijndael_buf_size;
check_openssl(EVP_CipherUpdate(cipher_ctx, out_data, &len, in_data, len));
}
void
QPDFCrypto_openssl::RC4_finalize()
{
if (EVP_CIPHER_CTX_cipher(cipher_ctx)) {
check_openssl(EVP_CIPHER_CTX_reset(cipher_ctx));
}
}
void
QPDFCrypto_openssl::rijndael_finalize()
{
if (EVP_CIPHER_CTX_cipher(cipher_ctx)) {
check_openssl(EVP_CIPHER_CTX_reset(cipher_ctx));
}
}
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