protocols: jabber: omemo

	- fixed hmac_sha256 (used openssl based instead of broken internal implementation)
	- utf8 related fixes

1 files changed, 31 insertions, 29 deletions

diff --git a/protocols/JabberG/src/jabber_omemo.cpp b/protocols/JabberG/src/jabber_omemo.cpp
index 3a7bd00ea8..427ac3ff1b 100755
--- a/protocols/JabberG/src/jabber_omemo.cpp
+++ b/protocols/JabberG/src/jabber_omemo.cpp
@@ -68,42 +68,39 @@ namespace omemo {
 		return 0;

 	}

 

-	struct hmac_sha256_ctx {

-		uint8_t *key, *data;

-		size_t key_len, data_len;

-	};

-

 	int hmac_sha256_init_func(void **hmac_context, const uint8_t *key, size_t key_len, void * /*user_data*/)

 	{

-		hmac_sha256_ctx *ctx = (hmac_sha256_ctx*)mir_alloc(sizeof(hmac_sha256_ctx));

-		ctx->key = (uint8_t*)mir_alloc(key_len);

-		memcpy(ctx->key, key, key_len);

-		ctx->key_len = key_len;

+		

+		HMAC_CTX *ctx = (HMAC_CTX*)mir_alloc(sizeof(HMAC_CTX));

+		HMAC_CTX_init(ctx);

+		HMAC_Init_ex(ctx, key, (int)key_len, EVP_sha256(), NULL);

 		*hmac_context = ctx;

+		//TODO: handle errors

 		return 0;

 	}

 	int hmac_sha256_update_func(void *hmac_context, const uint8_t *data, size_t data_len, void * /*user_data*/)

 	{

-		hmac_sha256_ctx *ctx = (hmac_sha256_ctx*)hmac_context;

-		ctx->data = (uint8_t*)mir_alloc(data_len);

-		memcpy(ctx->data, data, data_len);

-		ctx->data_len = data_len;

+		HMAC_CTX *ctx = (HMAC_CTX*)hmac_context;

+		HMAC_Update(ctx, data, data_len);

+		//TODO: handle errors

 		return 0;

 	}

 	int hmac_sha256_final_func(void *hmac_context, signal_buffer **output, void * /*user_data*/)

 	{

-		hmac_sha256_ctx *ctx = (hmac_sha256_ctx*)hmac_context;

-		BYTE hashout[MIR_SHA256_HASH_SIZE];

-		mir_hmac_sha256(hashout, ctx->key, ctx->key_len, ctx->data, ctx->data_len);

-		signal_buffer *output_buffer = signal_buffer_create(hashout, MIR_SHA256_HASH_SIZE);

+		HMAC_CTX *ctx = (HMAC_CTX*)hmac_context;

+		unsigned char buf[128];

+		unsigned int len = 0;

+		HMAC_Final(ctx, buf, &len);

+		signal_buffer *output_buffer = signal_buffer_create(buf, len);

 		*output = output_buffer;

+		//TODO: handle errors

 		return 0;

 	}

 	void hmac_sha256_cleanup_func(void * hmac_context, void * /*user_data*/)

 	{

-		hmac_sha256_ctx *ctx = (hmac_sha256_ctx*)hmac_context;

-		mir_free(ctx->key);

-		mir_free(ctx->data);

+		HMAC_CTX *ctx = (HMAC_CTX*)hmac_context;

+		HMAC_CTX_cleanup(ctx);

+		mir_free(ctx);

 	}

 

 	int sha512_digest_init_func(void **digest_context, void * /*user_data*/)

@@ -1799,23 +1796,27 @@ bool CJabberProto::OmemoHandleMessage(HXML node, wchar_t *jid, time_t msgTime)
 	{

 		int dec_success = 0;

 		size_t payload_len = 0;

-		int outl = 0, round_len = 0;

+		int outl = 0, round_len = 0, tag_len = 0;

 		char *payload_base64 = mir_u2a(payload_base64w);

 		unsigned char *payload = (unsigned char*)mir_base64_decode(payload_base64, &payload_len);

 		mir_free(payload_base64);

-		unsigned char key[16], tag[16];

+		unsigned char key[16], *tag;

 		{

-			unsigned char tmp[32];

-			memcpy(tmp, signal_buffer_data(decrypted_key), 32);

+			size_t buf_len = signal_buffer_len(decrypted_key);

+			unsigned char *tmp = (unsigned char*)mir_alloc(buf_len);

+			memcpy(tmp, signal_buffer_data(decrypted_key), buf_len);

 			memcpy(key, tmp, 16);

 			unsigned char *ptr = tmp + 16;

-			memcpy(tag, ptr, 16);

+			tag_len = (int)buf_len - 16;

+			tag = (unsigned char*)mir_alloc(tag_len);

+			memcpy(tag, ptr, tag_len);

+			mir_free(tmp);

 		}

 		out = (char*)mir_alloc(payload_len + 1); //TODO: check this

 		const EVP_CIPHER *cipher = EVP_aes_128_gcm();

 		EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();

 		EVP_DecryptInit(ctx, cipher, key, iv);

-		EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, 16, tag);

+		EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, tag_len, tag);

 		EVP_DecryptInit(ctx, nullptr, key, iv);

 		//EVP_DecryptUpdate(ctx, nullptr, &howmany, AAD, aad_len);

 

@@ -1832,7 +1833,8 @@ bool CJabberProto::OmemoHandleMessage(HXML node, wchar_t *jid, time_t msgTime)
 		mir_free(payload);

 		dec_success = EVP_DecryptFinal(ctx, tag, &round_len);

 		EVP_CIPHER_CTX_free(ctx);

-		if (dec_success <= 0) //TODO: check this... omemo xep have no info about tag

+		mir_free(tag);

+		if (dec_success <= 0)

 		{

 			debugLogA("Jabber OMEMO: error: aes_128_gcm verification failed");

 			return true;

@@ -1850,7 +1852,7 @@ bool CJabberProto::OmemoHandleMessage(HXML node, wchar_t *jid, time_t msgTime)
 	pResourceStatus pFromResource(ResourceInfoFromJID(jid));

 	PROTORECVEVENT recv = { 0 };

 	recv.timestamp = (DWORD)msgTime;

-	recv.szMessage = mir_utf8encode(out);

+	recv.szMessage = mir_strdup(out);

 	recv.lParam = (LPARAM)((pFromResource != nullptr && m_bEnableRemoteControl) ? pFromResource->m_tszResourceName : 0);

 	ProtoChainRecvMsg(hContact, &recv);

 	mir_free(out);

@@ -2298,7 +2300,7 @@ unsigned int CJabberProto::OmemoEncryptMessage(XmlNode &msg, const wchar_t *msg_
 	EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();

 	EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, _countof_portable(iv), nullptr);

 	EVP_EncryptInit(ctx, cipher, key, iv);

-	char *in = mir_u2a(msg_text), *out;

+	char *in = mir_utf8encodeW(msg_text), *out;

 	const size_t inl = strlen(in);

 	int tmp_len = 0, outl;

 	//EVP_EncryptUpdate(ctx, nullptr, &outl, aad, _countof_portable(aad));