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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>
53 lines
793 B
Go
53 lines
793 B
Go
// connects the Go crypto/rand package to the random number generation
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// on the ATECCx08 cryptographic processor.
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package main
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import (
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"crypto/rand"
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"errors"
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)
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var (
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errNoATECC = errors.New("no ATECCx08")
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)
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func init() {
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rand.Reader = &reader{}
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}
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type reader struct{}
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func (r *reader) Read(b []byte) (n int, err error) {
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if len(b) == 0 {
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return
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}
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if atecc == nil {
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return 0, errNoATECC
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}
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if !atecc.IsLocked() {
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panic("ATECCx08 is not locked and cannot produce random numbers!")
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}
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rnds, err := atecc.Random()
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if err != nil {
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return 0, err
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}
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for i := 0; i < len(b); i += 32 {
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if i+32 > len(b) {
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copy(b[i:], rnds[:(len(b)-i)])
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break
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}
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copy(b[i:], rnds[:])
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rnds, err = atecc.Random()
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if err != nil {
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return 0, err
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}
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}
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return len(b), nil
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}
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