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61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
//go:build !purego
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package sm2ec
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// p256Element is a P-256 base field element in [0, P-1] in the Montgomery
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// domain (with R 2²⁵⁶) as four limbs in little-endian order value.
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type p256Element [4]uint64
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// p256OrdElement is a P-256 scalar field element in [0, ord(G)-1] in the
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// Montgomery domain (with R 2²⁵⁶) as four uint64 limbs in little-endian order.
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type p256OrdElement [4]uint64
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// Montgomery multiplication. Sets res = in1 * in2 * R⁻¹ mod p.
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//
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//go:noescape
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func p256Mul(res, in1, in2 *p256Element)
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// Montgomery square, repeated n times (n >= 1).
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//
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//go:noescape
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func p256Sqr(res, in *p256Element, n int)
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// Montgomery multiplication by R⁻¹, or 1 outside the domain.
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// Sets res = in * R⁻¹, bringing res out of the Montgomery domain.
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//
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//go:noescape
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func p256FromMont(res, in *p256Element)
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// If cond is not 0, sets val = -val mod p.
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//
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//go:noescape
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func p256NegCond(val *p256Element, cond int)
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// If cond is 0, sets res = b, otherwise sets res = a.
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//
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//go:noescape
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func p256MovCond(res, a, b *SM2P256Point, cond int)
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//go:noescape
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func p256BigToLittle(res *p256Element, in *[32]byte)
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//go:noescape
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func p256LittleToBig(res *[32]byte, in *p256Element)
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//go:noescape
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func p256OrdBigToLittle(res *p256OrdElement, in *[32]byte)
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//go:noescape
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func p256OrdLittleToBig(res *[32]byte, in *p256OrdElement)
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// p256OrdReduce ensures s is in the range [0, ord(G)-1].
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//
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//go:noescape
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func p256OrdReduce(s *p256OrdElement)
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// Montgomery multiplication modulo org(G). Sets res = in1 * in2 * R⁻¹.
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//
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//go:noescape
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func p256OrdMul(res, in1, in2 *p256OrdElement)
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