topic Re: SHA-256 calculation problem on large buffer in i.MX RT Crossover MCUs

SHA-256 calculation problem on large buffer

davidrozenski — Wed, 07 Aug 2019 19:48:11 GMT

Dear,

I am using fsl_dcp.c driver to calculate SHA-256 and found strange problem, calling functions like :

status = DCP_HASH(DCP, &m_handle, kDCP_Sha256, (void*)0x60010000, 1000000, output, &outLength);

Never return it will be locked in this loop :

while ((base->STAT & (uint32_t)handle->channel) == handle->channel)
{
}

located in fsl_dcp.c function : DCP_WaitForChannelComplete

By removing this waiting loop it works and calculation are correct.

If length of buffer is less than 26000 (or close to this) it works.

Please advise.

Best Regards

David

Re: SHA-256 calculation problem on large buffer

jorge_a_vazquez — Thu, 15 Aug 2019 16:42:39 GMT

Hi David Rozenski

Sorry for the late reply, unfortunately, I'm not able to reproduce the issue that you are seeing. I imported the example code of the SDK 2.6.1 DCP, I comment all other tests and I used the same address and size of your code ((void*)0x60010000, 1000000, output, &outLength);. The DCP didn't lock in any part of the SHA256 process, can you try this and tell me if it works on your side.

Best regards

Re: SHA-256 calculation problem on large buffer

davidrozenski — Sun, 18 Aug 2019 19:56:09 GMT

Dear Jorge,

I upgraded SDK and thi sis ok Now.

Thanks and Regards