28 lines
729 B
Go
28 lines
729 B
Go
package crypto
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import (
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"crypto/md5"
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"github.com/google/uuid"
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)
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// uuidV3 Variation of google.uuid.NewHash
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// We need this because we want a 14-byte namespace and Google forces 16
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func uuidV3(space []byte, data []byte) uuid.UUID {
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h := md5.New()
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h.Reset()
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h.Write(space) //nolint:errcheck
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h.Write(data) //nolint:errcheck
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s := h.Sum(nil)
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var u uuid.UUID
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copy(u[:], s)
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u[6] = (u[6] & 0x0f) | uint8((3&0xf)<<4) // Version 3
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u[8] = (u[8] & 0x3f) | 0x80 // RFC 4122 variant
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return u
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}
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// FromOfflinePlayer generates a UUID for an offline-mode (cracked) player from their display name.
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func FromOfflinePlayer(displayName string) uuid.UUID {
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return uuidV3([]byte("OfflinePlayer:"), []byte(displayName))
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}
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