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23 lines
715 B
Go
23 lines
715 B
Go
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// Copyright (c) 2020 Shivaram Lingamneni <slingamn@cs.stanford.edu>
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// released under the MIT license
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package utils
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import (
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"crypto/sha256"
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"encoding/binary"
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"time"
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)
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// Deterministically generates a confirmation code for some destructive activity;
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// `name` is typically the name of the identity being destroyed (a channel being
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// unregistered, or the server being crashed) and `createdAt` means a different
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// value is required each time.
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func ConfirmationCode(name string, createdAt time.Time) (code string) {
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buf := make([]byte, len(name)+8)
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binary.BigEndian.PutUint64(buf, uint64(createdAt.UnixNano()))
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copy(buf[8:], name[:])
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out := sha256.Sum256(buf)
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return B32Encoder.EncodeToString(out[:3])
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}
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