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30 lines
758 B
Markdown
30 lines
758 B
Markdown
# b2s
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The firmware included a BLAKE2s digest of the expected device app in
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the first app slot. The firmware refuses to start the app if the
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computed digest differs from the constant.
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To simplify computing the digest, use this tool with the `-c` flag for
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including the digest in a C program:
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## Building
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`go build`
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## Running
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```
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./b2s -m b2s -c
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// BLAKE2s digest of b2s
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uint8_t digest[32] = {
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0x17, 0x36, 0xe9, 0x4e, 0xeb, 0x1b, 0xa2, 0x30, 0x89, 0xa9, 0xaa, 0xe, 0xf2, 0x6f, 0x35, 0xb2, 0xa9, 0x89, 0xac, 0x64, 0x63, 0xde, 0x38, 0x60, 0x47, 0x40, 0x91, 0x4e, 0xd7, 0x72, 0xa0, 0x58,
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};
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```
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To print the digest in a more user friendly way, leave out the `-c`:
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```
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./b2s -m b2s
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1736e94eeb1ba23089a9aa0ef26f35b2a989ac6463de38604740914ed772a058 b2s
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```
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