Hi,
I'm in the process of implementing a HTTP server in SBSFU where I can upload an update file from a webpage. I've based my work on the code in sfu_loader.c, specifically the function SFU_COM_YMODEM_DataPktRxCpltCallback() and I try to follow the same process.
So far I got the upload part working and now I try to get it to install but the issue I keep getting is that SE_Decrypt_Append() always fails on the second packet I receive.
I followed the function down the rabbit hole and the specific error that seems to occur is AES_ERR_BAD_OPERATION in SE_CRYPTO_Decrypt_Append().
Because this comes from a closed-source encryption library there's no way I can find out what is going wrong.
For error checking I check both the return value and the SE_StatusTypeDef parameter value. SE_Decrypt_Init returns SE_SUCCESS and SE_OK for both.
My TCP_MSS is set to 1072 which is what I use for my decrypted chuck buffers as well.
Here are the traces of my SBSFU which can help to give you an idea of the process:
[POST] Begin
[POST] HTTP parameter Content-Type: multipart/form-data; boundary= value: ---------------------------19265645189796
[POST] HTTP parameter Content-Length: value: 300880
[POST] Start erasing
[POST] Flash erased in 4 ms
[POST] Receive packet 0 of size 524B
Filename: test.sfb
[POST] Found start of image data at 173 in 0 ms
[POST] Header verification successful. Img size: 301472. Took 2 ms
[POST] SE_Decrypt_Init successful. Took 0 ms
[POST] Write header to flash done in 1 ms
[POST] Decrypting data of size 155B
[POST] SE_Decrypt_Append finished, took 0 ms |
[POST] Receive packet 1 of size 1072B
[POST] Decrypting data of size 1072B
[POST] SE_Decrypt_Append failed. ret_err: 00030c1e, SE err: 0013023d
[POST] Finished with error. Total data received 1596B of 300880B expected.
[POST] Ready, close connection
Note that the value of ret_err is the SE_ErrorStatus which I've altered to get more specific errors. The return value is thus: e_ret_status = SE_ERROR_AES_OFFSET + cryptolib_status; in SE_CRYPTO_Decrypt_Append()
typedef enum
{
SE_ERROR = 0x00018799U,
SE_ERROR_INITVAL = 0x00020000,
SE_ERROR_CRC_0,
SE_ERROR_CRC_1,
SE_ERROR_INPUT_1,
SE_ERROR_RAM_INPUT_1,
SE_ERROR_RAM_OUTPUT_1,
SE_ERROR_BUFFER_1,
SE_ERROR_INPUT_2,
SE_ERROR_RAM_INPUT_2,
SE_ERROR_RAM_OUTPUT_2,
SE_ERROR_BUFFER_2,
SE_ERROR_APPEND_BUFFER,
SE_ERROR_AES_OFFSET = 0x00030000,
SE_ERROR_APPEND_AES_INPUT,
SE_ERROR_APPEND_AES_OPERATION,
SE_ERROR_APPEND_AES_CONTEXT,
SE_ERROR_APPEND_AES_PARAMETER,
SE_SUCCESS = 0x0012310FU
} SE_ErrorStatus;
Can you please help to find out what seems to be going wrong?
Thank you!
Arno.
