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910ccdb092
Bumps [github.com/hashicorp/terraform-plugin-sdk/v2](https://github.com/hashicorp/terraform-plugin-sdk) from 2.26.1 to 2.27.0. - [Release notes](https://github.com/hashicorp/terraform-plugin-sdk/releases) - [Changelog](https://github.com/hashicorp/terraform-plugin-sdk/blob/main/CHANGELOG.md) - [Commits](https://github.com/hashicorp/terraform-plugin-sdk/compare/v2.26.1...v2.27.0) --- updated-dependencies: - dependency-name: github.com/hashicorp/terraform-plugin-sdk/v2 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>
47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
package x25519
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import (
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"crypto/subtle"
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fp "github.com/cloudflare/circl/math/fp25519"
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)
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// Size is the length in bytes of a X25519 key.
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const Size = 32
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// Key represents a X25519 key.
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type Key [Size]byte
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func (k *Key) clamp(in *Key) *Key {
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*k = *in
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k[0] &= 248
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k[31] = (k[31] & 127) | 64
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return k
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}
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// isValidPubKey verifies if the public key is not a low-order point.
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func (k *Key) isValidPubKey() bool {
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fp.Modp((*fp.Elt)(k))
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var isLowOrder int
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for _, P := range lowOrderPoints {
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isLowOrder |= subtle.ConstantTimeCompare(P[:], k[:])
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}
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return isLowOrder == 0
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}
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// KeyGen obtains a public key given a secret key.
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func KeyGen(public, secret *Key) {
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ladderJoye(public.clamp(secret))
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}
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// Shared calculates Alice's shared key from Alice's secret key and Bob's
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// public key returning true on success. A failure case happens when the public
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// key is a low-order point, thus the shared key is all-zeros and the function
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// returns false.
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func Shared(shared, secret, public *Key) bool {
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validPk := *public
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validPk[31] &= (1 << (255 % 8)) - 1
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ok := validPk.isValidPubKey()
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ladderMontgomery(shared.clamp(secret), &validPk)
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return ok
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}
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