Kyle Isom
115f23a3ea
Vendor dependencies and expose control program binaries via nix build. Uses nixpkgs-unstable for Go 1.26 support. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
package tpm2
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import (
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"fmt"
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)
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// Bitfield represents a TPM bitfield (i.e., TPMA_*) type.
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type Bitfield interface {
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// Length returns the length of the bitfield.
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Length() int
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}
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// BitGetter represents a TPM bitfield (i.e., TPMA_*) type that can be read.
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type BitGetter interface {
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Bitfield
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// GetReservedBit returns the value of the given reserved bit.
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// If the bit is not reserved, returns false.
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GetReservedBit(pos int) bool
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}
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// BitSetter represents a TPM bitfield (i.e., TPMA_*) type that can be written.
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type BitSetter interface {
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Bitfield
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// GetReservedBit sets the value of the given reserved bit.
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SetReservedBit(pos int, val bool)
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}
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func checkPos(pos int, len int) {
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if pos >= len || pos < 0 {
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panic(fmt.Errorf("bit %d out of range for %d-bit field", pos, len))
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}
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}
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// bitfield8 represents an 8-bit bitfield which may have reserved bits.
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// 8-bit TPMA_* types embed this one, and the reserved bits are stored in it.
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type bitfield8 uint8
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// Length implements the Bitfield interface.
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func (bitfield8) Length() int {
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return 8
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}
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// GetReservedBit implements the BitGetter interface.
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func (r bitfield8) GetReservedBit(pos int) bool {
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checkPos(pos, 8)
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return r&(1<<pos) != 0
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}
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// SetReservedBit implements the BitSetter interface.
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func (r *bitfield8) SetReservedBit(pos int, val bool) {
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checkPos(pos, 8)
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if val {
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*r |= 1 << pos
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} else {
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*r &= ^(1 << pos)
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}
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}
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// bitfield32 represents a 32-bit bitfield which may have reserved bits.
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// 32-bit TPMA_* types embed this one, and the reserved bits are stored in it.
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type bitfield32 uint32
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// Length implements the Bitfield interface.
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func (bitfield32) Length() int {
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return 32
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}
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// GetReservedBit implements the BitGetter interface.
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func (r bitfield32) GetReservedBit(pos int) bool {
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checkPos(pos, 32)
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return r&(1<<pos) != 0
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}
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// SetReservedBit implements the BitSetter interface.
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func (r *bitfield32) SetReservedBit(pos int, val bool) {
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checkPos(pos, 32)
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if val {
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*r |= 1 << pos
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} else {
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*r &= ^(1 << pos)
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}
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}
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