改写RSA模块

添加RSA私钥解密函数

include/error.h

@@ -28,6 +28,8 @@ namespace Net {
 
         void printInfo(const string& info, string tag = "");
 
+        void printInfoBuffer(const string& info, string tag = "");
+
         void printInfoFormal(const string& title, initializer_list<FormalItem> body);
     }
 }

include/rsacpp.h

@@ -9,6 +9,7 @@
 
 #include <openssl/rsa.h>
 #include <openssl/pem.h>
+#include <openssl/err.h>
 #include <memory>
 
 using namespace std;
@@ -26,31 +27,16 @@ namespace Net {
             this->buffer_size = t.buffer_size;
         }
 
-        void generateKeyPair(){
-            BIGNUM *e = BN_new();
-//            生成一个4bit质数
-            BN_generate_prime_ex(e, 3, 1, nullptr, nullptr, nullptr);
-//            生成一对秘钥
-            RSA_generate_key_ex(key_pair, 2048, e, nullptr);
-            BN_free(e);
-            if(this->key_pair == nullptr) throw runtime_error("key pair generation failed");
-            buffer_size = RSA_size(key_pair);
-        }
+        void generateKeyPair();
 
         void checkKey(){
             if(this->key_pair == nullptr) throw runtime_error("key pair is invalid");
             RSA_check_key(this->key_pair);
         }
 
-        void publicKeyEncrypt(string &data, string &encrypted_data){
-            if(this->key_pair == nullptr) throw runtime_error("key pair is invalid");
-            if(data.size() >= this->getBufferSize()) throw runtime_error("string data is too long");
-//            预分配储存空间
-            encrypted_data.resize(buffer_size);
-//            使用公钥加密
-            RSA_public_encrypt(data.size(), reinterpret_cast<const unsigned char *>(data.c_str()),
-                               reinterpret_cast<unsigned char *>(&data[0]), key_pair, RSA_NO_PADDING);
-        }
+        void publicKeyEncrypt(const string &data, string &encrypted_data);
+
+        void privateKeyDecrypt(string &data, const string& encrypted_data);
 
         uint32_t getBufferSize() const {
             return this->buffer_size;

src/error.cpp

@@ -38,5 +38,21 @@ namespace Net {
             }
             printf("----------------------------------<\n<<<\n\n");
         }
+
+        void printInfoBuffer(const string &info, string tag) {
+            printf("\n[DEBUG INFO (BUFFER)]\n");
+            printf(">----------------------------------------------\n");
+            uint8_t *p_i = (uint8_t *) &info[0];
+            uint8_t *p_e = (uint8_t *) &info[info.size()-1];
+            for(int c = 0;p_i < p_e; ++p_i, ++c){
+                if(!(c % 16) && c) printf("\n");
+                printf("%02x ",*p_i);
+
+            }
+            printf("\n");
+            printf("----------------------------------------------<\n");
+            if(tag.size())
+                printf("{ %s }\n\n",tag.data());
+        }
     }
 }

src/rsacpp.cpp

@@ -10,3 +10,44 @@ void Net::RSAKeyChain::getDefaultRSAMethod() {
         {"name", rsaMethod->name},
     });
 }
+
+void Net::RSAKeyChain::generateKeyPair() {
+    BIGNUM *e = BN_new();
+//            生成一个4bit质数
+    BN_generate_prime_ex(e, 3, 1, nullptr, nullptr, nullptr);
+//            生成一对秘钥
+    RSA_generate_key_ex(key_pair, 2048, e, nullptr);
+    BN_free(e);
+    if(this->key_pair == nullptr) throw runtime_error("key pair generation failed");
+    buffer_size = RSA_size(key_pair);
+}
+
+void Net::RSAKeyChain::privateKeyDecrypt(string &data, const string &encrypted_data) {
+    if(this->key_pair == nullptr) throw runtime_error("key pair is invalid");
+    assert(buffer_size > 0);
+    if(encrypted_data.size() != buffer_size) throw runtime_error("encrypt data's size is abnormal");
+//    使用私钥解密
+    if(RSA_private_decrypt(encrypted_data.size(), reinterpret_cast<const unsigned char *>(&encrypted_data[0]),
+                           reinterpret_cast<unsigned char *>(&data[0]),
+                           key_pair,
+                           RSA_NO_PADDING) == -1)
+        throw  runtime_error(ERR_error_string(ERR_get_error(), nullptr));
+
+}
+
+void Net::RSAKeyChain::publicKeyEncrypt(const string &data, string &encrypted_data) {
+    if(this->key_pair == nullptr) throw runtime_error("key pair is invalid");
+    assert(buffer_size > 0);
+    if(data.size() >= this->getBufferSize()) throw runtime_error("string data is too long");
+//            预分配储存空间
+    encrypted_data.resize(buffer_size);
+//            加密数据转移
+    string tmp_data = data;
+    tmp_data.resize(buffer_size);
+//            使用公钥加密
+    if(RSA_public_encrypt(tmp_data.size(), reinterpret_cast<const unsigned char *>(&tmp_data[0]),
+                          reinterpret_cast<unsigned char *>(&encrypted_data[0]),
+                          key_pair,
+                          RSA_NO_PADDING) == -1)
+        throw  runtime_error(ERR_error_string(ERR_get_error(), nullptr));
+}

test/env.h

@@ -10,6 +10,8 @@
 class GlobalTestEnv : public testing::Environment{
 public:
     unique_ptr<Net::RSAKeyChain> rsa{new Net::RSAKeyChain()};
+    string rsa_test_data = "hello world";
+    string rsa_encrypt_data;
 };
 
 #endif //NET_ENV_H

test/rsa_test.cpp

@@ -14,15 +14,24 @@ GlobalTestEnv *_env;
 
 TEST(RSATest, init_test_1) {
     _env->rsa->getDefaultRSAMethod();
-    error::printInfo(to_string(_env->rsa->getBufferSize()), string("Buffer Size"));
+
 
 }
 
 TEST(RSATest, generate_test_1) {
    _env->rsa->generateKeyPair();
+    error::printInfo(to_string(_env->rsa->getBufferSize()), string("Buffer Size"));
 }
 
 TEST(RSATest, pub_encrypt_test_1) {
-    RSAKeyChain rsa;
-    rsa.generateKeyPair();
+    string encrypted_data;
+    _env->rsa->publicKeyEncrypt(_env->rsa_test_data, encrypted_data);
+    error::printInfoBuffer(encrypted_data, "Encrypted Data");
+    _env->rsa_encrypt_data = encrypted_data;
+}
+
+TEST(RSATest, prv_decrypt_test_1){
+    string data;
+    _env->rsa->privateKeyDecrypt(data, _env->rsa_encrypt_data);
+    error::printInfo(data, "Decrypt Data");
 }