QPDFCrypto_openssl.cc
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#include <qpdf/QPDFCrypto_openssl.hh>
#include <cstring>
#include <stdexcept>
#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)
{
throw std::runtime_error("openssl error");
}
}
QPDFCrypto_openssl::QPDFCrypto_openssl() :
md_ctx(EVP_MD_CTX_new()), cipher_ctx(EVP_CIPHER_CTX_new())
{
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);
EVP_MD_CTX_free(md_ctx);
}
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()
{
if (EVP_MD_CTX_md(md_ctx))
{
check_openssl(EVP_DigestFinal(md_ctx, md_out + 0, nullptr));
}
}
void
QPDFCrypto_openssl::SHA2_finalize()
{
if (EVP_MD_CTX_md(md_ctx))
{
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, EVP_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(
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* in_data, size_t len, unsigned char* out_data)
{
if (nullptr == out_data)
{
out_data = in_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));
}
}