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//
// JBCyrpto.cpp
// xcopenvpn
//
// Created by Arne Schwabe on 12.07.12.
// Copyright (c) 2012 Universität Paderborn. All rights reserved.
//
#include <jni.h>
#include <internal/cryptlib.h>
#include <openssl/ssl.h>
#include <openssl/rsa.h>
#include <openssl/objects.h>
#include <openssl/md5.h>
#include <android/log.h>
#include <openssl/err.h>
#include <internal/evp_int.h>
extern "C" {
jbyteArray Java_de_blinkt_openvpn_core_NativeUtils_rsasign(JNIEnv* env, jclass, jbyteArray from, jint pkeyRef);
}
int jniThrowException(JNIEnv* env, const char* className, const char* msg) {
jclass exceptionClass = env->FindClass(className);
if (exceptionClass == NULL) {
__android_log_print(ANDROID_LOG_DEBUG,"openvpn","Unable to find exception class %s", className);
/* ClassNotFoundException now pending */
return -1;
}
if (env->ThrowNew( exceptionClass, msg) != JNI_OK) {
__android_log_print(ANDROID_LOG_DEBUG,"openvpn","Failed throwing '%s' '%s'", className, msg);
/* an exception, most likely OOM, will now be pending */
return -1;
}
env->DeleteLocalRef(exceptionClass);
return 0;
}
static char opensslerr[1024];
jbyteArray Java_de_blinkt_openvpn_core_NativeUtils_rsasign (JNIEnv* env, jclass, jbyteArray from, jint pkeyRef) {
// EVP_MD_CTX* ctx = reinterpret_cast<EVP_MD_CTX*>(ctxRef);
EVP_PKEY* pkey = reinterpret_cast<EVP_PKEY*>(pkeyRef);
if (pkey == NULL || from == NULL) {
jniThrowException(env, "java/lang/NullPointerException", "EVP_KEY is null");
return NULL;
}
jbyte* data = env-> GetByteArrayElements (from, NULL);
int datalen = env-> GetArrayLength(from);
if(data==NULL )
jniThrowException(env, "java/lang/NullPointerException", "data is null");
int siglen;
unsigned char* sigret = (unsigned char*)malloc(RSA_size(pkey->pkey.rsa));
//int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
// unsigned char *sigret, unsigned int *siglen, RSA *rsa);
// adapted from s3_clnt.c
/* if (RSA_sign(NID_md5_sha1, (unsigned char*) data, datalen,
sigret, &siglen, pkey->pkey.rsa) <= 0 ) */
siglen = RSA_private_encrypt(datalen,(unsigned char*) data,sigret,pkey->pkey.rsa,RSA_PKCS1_PADDING);
if (siglen < 0)
{
ERR_error_string_n(ERR_get_error(), opensslerr ,1024);
jniThrowException(env, "java/security/InvalidKeyException", opensslerr);
ERR_print_errors_fp(stderr);
return NULL;
}
jbyteArray jb;
jb =env->NewByteArray(siglen);
env->SetByteArrayRegion(jb, 0, siglen, (jbyte *) sigret);
free(sigret);
return jb;
}
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