result_t PKey::decrypt(Buffer_base *data, obj_ptr<Buffer_base> &retVal,
AsyncEvent *ac)
{
if (!ac)
return CHECK_ERROR(CALL_E_NOSYNC);
result_t hr;
bool priv;
hr = isPrivate(priv);
if (hr < 0)
return hr;
if (!priv)
return CHECK_ERROR(CALL_E_INVALID_CALL);
int32_t ret;
std::string str;
std::string output;
size_t olen;
data->toString(str);
output.resize(MBEDTLS_PREMASTER_SIZE * 2);
ret = mbedtls_pk_decrypt(&m_key, (const unsigned char *)str.c_str(), str.length(),
(unsigned char *)&output[0], &olen, output.length(),
mbedtls_ctr_drbg_random, &g_ssl.ctr_drbg);
if (ret != 0)
return CHECK_ERROR(_ssl::setError(ret));
output.resize(olen);
retVal = new Buffer(output);
return 0;
}
int main( int argc, char *argv[] )
{
FILE *f;
int ret, c;
size_t i, olen = 0;
mbedtls_pk_context pk;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
unsigned char result[1024];
unsigned char buf[512];
const char *pers = "mbedtls_pk_decrypt";
((void) argv);
mbedtls_ctr_drbg_init( &ctr_drbg );
memset(result, 0, sizeof( result ) );
ret = 1;
if( argc != 2 )
{
mbedtls_printf( "usage: mbedtls_pk_decrypt <key_file>\n" );
#if defined(_WIN32)
mbedtls_printf( "\n" );
#endif
goto exit;
}
mbedtls_printf( "\n . Seeding the random number generator..." );
fflush( stdout );
mbedtls_entropy_init( &entropy );
if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
goto exit;
}
mbedtls_printf( "\n . Reading private key from '%s'", argv[1] );
fflush( stdout );
mbedtls_pk_init( &pk );
if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "" ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_pk_parse_keyfile returned -0x%04x\n", -ret );
goto exit;
}
/*
* Extract the RSA encrypted value from the text file
*/
ret = 1;
if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
{
mbedtls_printf( "\n ! Could not open %s\n\n", "result-enc.txt" );
goto exit;
}
i = 0;
while( fscanf( f, "%02X", &c ) > 0 &&
i < (int) sizeof( buf ) )
buf[i++] = (unsigned char) c;
fclose( f );
/*
* Decrypt the encrypted RSA data and print the result.
*/
mbedtls_printf( "\n . Decrypting the encrypted data" );
fflush( stdout );
if( ( ret = mbedtls_pk_decrypt( &pk, buf, i, result, &olen, sizeof(result),
mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_pk_decrypt returned -0x%04x\n", -ret );
goto exit;
}
mbedtls_printf( "\n . OK\n\n" );
mbedtls_printf( "The decrypted result is: '%s'\n\n", result );
ret = 0;
exit:
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_entropy_free( &entropy );
#if defined(MBEDTLS_ERROR_C)
if( ret != 0 )
{
mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
mbedtls_printf( " ! Last error was: %s\n", buf );
}
#endif
#if defined(_WIN32)
mbedtls_printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
/**
* Block symmetric ciphers.
* Please note that linker-override is possible, but dynamic override is generally
* preferable to avoid clobbering all symmetric support.
*
* @param uint8_t* Buffer containing plaintext.
* @param int Length of plaintext.
* @param uint8_t* Target buffer for ciphertext.
* @param int Length of output.
* @param uint8_t* Buffer containing the symmetric key.
* @param int Length of the key, in bits.
* @param uint8_t* IV. Caller's responsibility to use correct size.
* @param Cipher The cipher by which to encrypt.
* @param uint32_t Options to the optionation.
* @return true if the root function ought to defer.
*/
int __attribute__((weak)) wrapped_sym_cipher(uint8_t* in, int in_len, uint8_t* out, int out_len, uint8_t* key, int key_len, uint8_t* iv, Cipher ci, uint32_t opts) {
if (cipher_deferred_handling(ci)) {
// If overriden by user implementation.
return _sym_overrides[ci](in, in_len, out, out_len, key, key_len, iv, ci, opts);
}
int8_t ret = -1;
switch (ci) {
#if defined(MBEDTLS_AES_C)
case Cipher::SYM_AES_256_CBC:
case Cipher::SYM_AES_192_CBC:
case Cipher::SYM_AES_128_CBC:
{
mbedtls_aes_context ctx;
if (opts & OP_ENCRYPT) {
mbedtls_aes_setkey_enc(&ctx, key, (unsigned int) key_len);
}
else {
mbedtls_aes_setkey_dec(&ctx, key, (unsigned int) key_len);
}
ret = mbedtls_aes_crypt_cbc(&ctx, _cipher_opcode(ci, opts), in_len, iv, in, out);
mbedtls_aes_free(&ctx);
}
break;
#endif
#if defined(MBEDTLS_RSA_C)
case Cipher::ASYM_RSA:
{
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ctr_drbg_init(&ctr_drbg);
size_t olen = 0;
mbedtls_pk_context ctx;
mbedtls_pk_init(&ctx);
if (opts & OP_ENCRYPT) {
ret = mbedtls_pk_encrypt(&ctx, in, in_len, out, &olen, out_len, mbedtls_ctr_drbg_random, &ctr_drbg);
}
else {
ret = mbedtls_pk_decrypt(&ctx, in, in_len, out, &olen, out_len, mbedtls_ctr_drbg_random, &ctr_drbg);
}
mbedtls_pk_free(&ctx);
}
break;
#endif
#if defined(MBEDTLS_BLOWFISH_C)
case Cipher::SYM_BLOWFISH_CBC:
{
mbedtls_blowfish_context ctx;
mbedtls_blowfish_setkey(&ctx, key, key_len);
ret = mbedtls_blowfish_crypt_cbc(&ctx, _cipher_opcode(ci, opts), in_len, iv, in, out);
mbedtls_blowfish_free(&ctx);
}
break;
#endif
#if defined(WRAPPED_SYM_NULL)
case Cipher::SYM_NULL:
memcpy(out, in, in_len);
ret = 0;
break;
#endif
default:
break;
}
return ret;
}