feat(decrypto): add decrypto interface

impl avAESDecrypt and OpenSSAESDecrypt

Signed-off-by: pingkai <pingkai010@gmail.com>

framework/demuxer/CMakeLists.txt

@@ -64,7 +64,7 @@ set(SOURCE_FILES demuxer_service.cpp
         sample_decrypt/SampleDecryptDemuxer.h
         sample_decrypt/sampleDecryptDec.c
         sample_decrypt/ISampleDecrypt2c.cpp
-        sample_decrypt/ISampleDecrypt2c.h)
+        sample_decrypt/ISampleDecrypt2c.h decrypto/IAESDecrypt.h decrypto/avAESDecrypt.cpp decrypto/avAESDecrypt.h decrypto/OpenSSAESDecrypt.cpp decrypto/OpenSSAESDecrypt.h)
 
 include_directories(
 #${CICADA_FRAMEWORK_DIR}/inc

framework/demuxer/decrypto/IAESDecrypt.h

@@ -0,0 +1,28 @@
+//
+// Created by moqi on 2020/2/20.
+//
+
+#ifndef CICADAMEDIA_IAESDECRYPT_H
+#define CICADAMEDIA_IAESDECRYPT_H
+
+#include <cstdint>
+
+
+namespace Cicada {
+    class IAESDecrypt {
+    public:
+        const static int BLOCK_SIZE = 16;
+
+        IAESDecrypt() = default;
+
+        virtual ~IAESDecrypt() = default;
+
+        virtual int setKey(const uint8_t *key, int key_bits) = 0;
+
+        virtual void decrypt(uint8_t *dst, const uint8_t *src, int count, uint8_t *iv) = 0;
+
+    };
+}
+
+
+#endif //CICADAMEDIA_IAESDECRYPT_H

framework/demuxer/decrypto/OpenSSAESDecrypt.cpp

@@ -0,0 +1,22 @@
+//
+// Created by moqi on 2020/2/20.
+//
+
+#include <openssl/aes.h>
+#include "OpenSSAESDecrypt.h"
+
+using namespace Cicada;
+
+OpenSSAESDecrypt::OpenSSAESDecrypt() = default;
+
+OpenSSAESDecrypt::~OpenSSAESDecrypt() = default;
+
+int OpenSSAESDecrypt::setKey(const uint8_t *key, int key_bits)
+{
+    return AES_set_decrypt_key(key, 8 * AES_BLOCK_SIZE/*128*/, &mAesKey);
+}
+
+void OpenSSAESDecrypt::decrypt(uint8_t *dst, const uint8_t *src, int count, uint8_t *iv)
+{
+    AES_cbc_encrypt(src, dst, count * AES_BLOCK_SIZE, &mAesKey, iv, AES_DECRYPT);
+}

framework/demuxer/decrypto/OpenSSAESDecrypt.h

@@ -0,0 +1,28 @@
+//
+// Created by moqi on 2020/2/20.
+//
+
+#ifndef CICADAMEDIA_OPENSSAESDECRYPT_H
+#define CICADAMEDIA_OPENSSAESDECRYPT_H
+
+#include "IAESDecrypt.h"
+
+namespace Cicada {
+    class OpenSSAESDecrypt : public IAESDecrypt {
+    public:
+        OpenSSAESDecrypt();
+
+        ~OpenSSAESDecrypt() override;
+
+        int setKey(const uint8_t *key, int key_bits) override;
+
+        void decrypt(uint8_t *dst, const uint8_t *src, int count, uint8_t *iv) override;
+
+    private:
+        AES_KEY mAesKey{};
+
+    };
+}
+
+
+#endif //CICADAMEDIA_OPENSSAESDECRYPT_H

framework/demuxer/decrypto/avAESDecrypt.cpp

@@ -0,0 +1,31 @@
+//
+// Created by moqi on 2020/2/20.
+//
+extern "C" {
+#include <libavutil/mem.h>
+#include <libavutil/aes.h>
+}
+
+#include "avAESDecrypt.h"
+
+using namespace Cicada;
+
+avAESDecrypt::avAESDecrypt()
+{
+    mAes = av_aes_alloc();
+}
+
+avAESDecrypt::~avAESDecrypt()
+{
+    av_free(mAes);
+}
+
+void avAESDecrypt::decrypt(uint8_t *dst, const uint8_t *src, int count, uint8_t *iv)
+{
+    av_aes_crypt(mAes, dst, src, count, iv, 1);
+}
+
+int avAESDecrypt::setKey(const uint8_t *key, int key_bits)
+{
+    return av_aes_init(mAes, key, key_bits, 1);
+}

framework/demuxer/decrypto/avAESDecrypt.h

@@ -0,0 +1,28 @@
+//
+// Created by moqi on 2020/2/20.
+//
+
+#ifndef CICADAMEDIA_AVAESDECRYPT_H
+#define CICADAMEDIA_AVAESDECRYPT_H
+
+#include "IAESDecrypt.h"
+
+namespace Cicada {
+    class avAESDecrypt : public IAESDecrypt {
+    public:
+        avAESDecrypt();
+
+        ~avAESDecrypt() override;
+
+        int setKey(const uint8_t *key, int key_bits) override;
+
+        void decrypt(uint8_t *dst, const uint8_t *src, int count, uint8_t *iv) override;
+
+    private:
+        struct AVAES *mAes{nullptr};
+
+    };
+}
+
+
+#endif //CICADAMEDIA_AVAESDECRYPT_H