9821ea4d21
Add ECDH shared secret, ephemeral key derivation (DerivePublicKey, DeriveSecretKey), and key image generation/validation to the CGo bridge. Tests verify ECDH commutativity, output scanning round-trip, and key image determinism. Co-Authored-By: Charon <charon@lethean.io>
33 lines
815 B
Go
33 lines
815 B
Go
// SPDX-Licence-Identifier: EUPL-1.2
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package crypto
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/*
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#include "bridge.h"
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*/
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import "C"
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import (
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"fmt"
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"unsafe"
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)
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// GenerateKeyImage computes the key image for a public/secret key pair.
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// The key image is used for double-spend detection in ring signatures.
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func GenerateKeyImage(pub [32]byte, sec [32]byte) ([32]byte, error) {
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var ki [32]byte
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rc := C.cn_generate_key_image(
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(*C.uint8_t)(unsafe.Pointer(&pub[0])),
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(*C.uint8_t)(unsafe.Pointer(&sec[0])),
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(*C.uint8_t)(unsafe.Pointer(&ki[0])),
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)
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if rc != 0 {
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return ki, fmt.Errorf("crypto: generate_key_image failed")
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}
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return ki, nil
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}
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// ValidateKeyImage checks that a key image is a valid curve point of the correct order.
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func ValidateKeyImage(ki [32]byte) bool {
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return C.cn_validate_key_image((*C.uint8_t)(unsafe.Pointer(&ki[0]))) == 0
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}
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