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deadprogram
68d4991da1
This working implementation for the ATECCx08 family of cryptgraphic processors has random number generation and other needed supporting functions. It also includes a sample of how to connect it to the Go crypto/rand package. More cryptographic functions await a future interation. Signed-off-by: deadprogram <ron@hybridgroup.com>
33 lines
545 B
Go
33 lines
545 B
Go
// from https://github.com/usbarmory/armoryctl/blob/master/atecc608/atecc608.go#L104
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// thank you!
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package ateccx08
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const (
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CRC16Poly uint16 = 0x8005
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)
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func crc16(data []byte) []byte {
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var crc uint16
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for i := 0; i < len(data); i++ {
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for shift := uint8(0x01); shift > 0x00; shift <<= 1 {
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// data and crc bits
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var d uint8
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var c uint8
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if uint8(data[i])&uint8(shift) != 0 {
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d = 1
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}
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c = uint8(crc >> 15)
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crc <<= 1
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if d != c {
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crc ^= CRC16Poly
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}
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}
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}
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return []byte{byte(crc & 0xff), byte(crc >> 8)}
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}
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