s1d3sw1ped
b38f7f643b
Parse filanfc-dump/v1 zip/JSON, Bambu 1K images, and merge stickers by tray UID. dump and mifare packages stay importable for a later common library.
31 lines
656 B
Go
31 lines
656 B
Go
package bambunfc
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import (
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"crypto/hkdf"
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"crypto/sha256"
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"fmt"
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)
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var kdfSalt = []byte{
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0x9a, 0x75, 0x9c, 0xf2, 0xc4, 0xf7, 0xca, 0xff,
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0x22, 0x2c, 0xb9, 0x76, 0x9b, 0x41, 0xbc, 0x96,
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}
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const kdfInfo = "RFID-A\x00"
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// KeysA derives the 16 MIFARE Key-A values for a Bambu tag from its chip UID.
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func KeysA(uid []byte) ([16][6]byte, error) {
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var keys [16][6]byte
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if len(uid) == 0 {
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return keys, fmt.Errorf("%w: empty", ErrUID)
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}
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okm, err := hkdf.Key(sha256.New, uid, kdfSalt, kdfInfo, 16*6)
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if err != nil {
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return keys, fmt.Errorf("%w: hkdf: %v", ErrUID, err)
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}
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for i := range 16 {
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copy(keys[i][:], okm[i*6:i*6+6])
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}
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return keys, nil
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}
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