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crypto/ecdsa: deprecate direct use of big.Int fields in keys

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Updates #63963

Change-Id: I6a6a69645e625cde1ac1c6abf698a5fd3d52b4cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/701516
Auto-Submit: Filippo Valsorda <filippo@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This commit is contained in:
Filippo Valsorda 2025-09-07 15:36:10 +02:00 • committed by Gopher Robot
parent a67977da5e
commit 645ee44492
3 changed files with 6 additions and 6 deletions
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3
api/next/63963.txt Normal file
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@ -0,0 +1,3 @@
pkg crypto/ecdsa, type PrivateKey struct, D //deprecated #63963
pkg crypto/ecdsa, type PublicKey struct, X //deprecated #63963
pkg crypto/ecdsa, type PublicKey struct, Y //deprecated #63963

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doc/next/6-stdlib/99-minor/crypto/ecdsa/63963.md Normal file
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@ -0,0 +1 @@
The `big.Int` fields of [PublicKey] and [PrivateKey] are now deprecated.

8
src/crypto/ecdsa/ecdsa.go
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@ -44,15 +44,13 @@ type PublicKey struct {
// X, Y are the coordinates of the public key point.
//
// Modifying the raw coordinates can produce invalid keys, and may
// Deprecated: modifying the raw coordinates can produce invalid keys, and may
// invalidate internal optimizations; moreover, [big.Int] methods are not
// suitable for operating on cryptographic values. To encode and decode
// PublicKey values, use [PublicKey.Bytes] and [ParseUncompressedPublicKey]
// or [crypto/x509.MarshalPKIXPublicKey] and [crypto/x509.ParsePKIXPublicKey].
// For ECDH, use [crypto/ecdh]. For lower-level elliptic curve operations,
// use a third-party module like filippo.io/nistec.
//
// These fields will be deprecated in Go 1.26.
X, Y *big.Int
}
@ -171,14 +169,12 @@ type PrivateKey struct {
// D is the private scalar value.
//
// Modifying the raw value can produce invalid keys, and may
// Deprecated: modifying the raw value can produce invalid keys, and may
// invalidate internal optimizations; moreover, [big.Int] methods are not
// suitable for operating on cryptographic values. To encode and decode
// PrivateKey values, use [PrivateKey.Bytes] and [ParseRawPrivateKey] or
// [crypto/x509.MarshalPKCS8PrivateKey] and [crypto/x509.ParsePKCS8PrivateKey].
// For ECDH, use [crypto/ecdh].
//
// This field will be deprecated in Go 1.26.
D *big.Int
}