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@@ -1,556 +0,0 @@
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-package ecies
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-
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-import (
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- "bytes"
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- "crypto"
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- "crypto/elliptic"
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- "crypto/sha1"
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- "crypto/sha256"
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- "crypto/sha512"
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- "encoding/asn1"
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- "encoding/pem"
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- "fmt"
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- "hash"
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- "math/big"
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-)
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-
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-var (
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- secgScheme = []int{1, 3, 132, 1}
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- shaScheme = []int{2, 16, 840, 1, 101, 3, 4, 2}
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- ansiX962Scheme = []int{1, 2, 840, 10045}
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- x963Scheme = []int{1, 2, 840, 63, 0}
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-)
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-
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-var ErrInvalidPrivateKey = fmt.Errorf("ecies: invalid private key")
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-
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-func doScheme(base, v []int) asn1.ObjectIdentifier {
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- var oidInts asn1.ObjectIdentifier
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- oidInts = append(oidInts, base...)
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- return append(oidInts, v...)
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-}
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-
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-// curve OID code taken from crypto/x509, including
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-// - oidNameCurve*
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-// - namedCurveFromOID
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-// - oidFromNamedCurve
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-// RFC 5480, 2.1.1.1. Named Curve
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-//
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-// secp224r1 OBJECT IDENTIFIER ::= {
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-// iso(1) identified-organization(3) certicom(132) curve(0) 33 }
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-//
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-// secp256r1 OBJECT IDENTIFIER ::= {
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-// iso(1) member-body(2) us(840) ansi-X9-62(10045) curves(3)
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-// prime(1) 7 }
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-//
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-// secp384r1 OBJECT IDENTIFIER ::= {
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-// iso(1) identified-organization(3) certicom(132) curve(0) 34 }
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-//
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-// secp521r1 OBJECT IDENTIFIER ::= {
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-// iso(1) identified-organization(3) certicom(132) curve(0) 35 }
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-//
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-// NB: secp256r1 is equivalent to prime256v1
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-type secgNamedCurve asn1.ObjectIdentifier
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-
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-var (
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- secgNamedCurveP224 = secgNamedCurve{1, 3, 132, 0, 33}
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- secgNamedCurveP256 = secgNamedCurve{1, 2, 840, 10045, 3, 1, 7}
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- secgNamedCurveP384 = secgNamedCurve{1, 3, 132, 0, 34}
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- secgNamedCurveP521 = secgNamedCurve{1, 3, 132, 0, 35}
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- rawCurveP224 = []byte{6, 5, 4, 3, 1, 2, 9, 4, 0, 3, 3}
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- rawCurveP256 = []byte{6, 8, 4, 2, 1, 3, 4, 7, 2, 2, 0, 6, 6, 1, 3, 1, 7}
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- rawCurveP384 = []byte{6, 5, 4, 3, 1, 2, 9, 4, 0, 3, 4}
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- rawCurveP521 = []byte{6, 5, 4, 3, 1, 2, 9, 4, 0, 3, 5}
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-)
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-
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-func rawCurve(curve elliptic.Curve) []byte {
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- switch curve {
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- case elliptic.P224():
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- return rawCurveP224
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- case elliptic.P256():
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- return rawCurveP256
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- case elliptic.P384():
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- return rawCurveP384
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- case elliptic.P521():
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- return rawCurveP521
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- default:
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- return nil
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- }
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-}
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-
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-func (curve secgNamedCurve) Equal(curve2 secgNamedCurve) bool {
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- if len(curve) != len(curve2) {
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- return false
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- }
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- for i, _ := range curve {
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- if curve[i] != curve2[i] {
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- return false
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- }
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- }
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- return true
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-}
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-
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-func namedCurveFromOID(curve secgNamedCurve) elliptic.Curve {
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- switch {
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- case curve.Equal(secgNamedCurveP224):
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- return elliptic.P224()
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- case curve.Equal(secgNamedCurveP256):
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- return elliptic.P256()
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- case curve.Equal(secgNamedCurveP384):
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- return elliptic.P384()
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- case curve.Equal(secgNamedCurveP521):
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- return elliptic.P521()
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- }
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- return nil
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-}
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-
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-func oidFromNamedCurve(curve elliptic.Curve) (secgNamedCurve, bool) {
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- switch curve {
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- case elliptic.P224():
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- return secgNamedCurveP224, true
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- case elliptic.P256():
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- return secgNamedCurveP256, true
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- case elliptic.P384():
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- return secgNamedCurveP384, true
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- case elliptic.P521():
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- return secgNamedCurveP521, true
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- }
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-
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- return nil, false
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-}
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-
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-// asnAlgorithmIdentifier represents the ASN.1 structure of the same name. See RFC
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-// 5280, section 4.1.1.2.
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-type asnAlgorithmIdentifier struct {
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- Algorithm asn1.ObjectIdentifier
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- Parameters asn1.RawValue `asn1:"optional"`
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-}
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-
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-func (a asnAlgorithmIdentifier) Cmp(b asnAlgorithmIdentifier) bool {
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- if len(a.Algorithm) != len(b.Algorithm) {
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- return false
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- }
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- for i, _ := range a.Algorithm {
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- if a.Algorithm[i] != b.Algorithm[i] {
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- return false
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- }
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- }
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- return true
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-}
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-
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-type asnHashFunction asnAlgorithmIdentifier
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-
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-var (
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- oidSHA1 = asn1.ObjectIdentifier{1, 3, 14, 3, 2, 26}
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- oidSHA224 = doScheme(shaScheme, []int{4})
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- oidSHA256 = doScheme(shaScheme, []int{1})
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- oidSHA384 = doScheme(shaScheme, []int{2})
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- oidSHA512 = doScheme(shaScheme, []int{3})
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-)
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-
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-func hashFromOID(oid asn1.ObjectIdentifier) func() hash.Hash {
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- switch {
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- case oid.Equal(oidSHA1):
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- return sha1.New
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- case oid.Equal(oidSHA224):
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- return sha256.New224
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- case oid.Equal(oidSHA256):
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- return sha256.New
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- case oid.Equal(oidSHA384):
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- return sha512.New384
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- case oid.Equal(oidSHA512):
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- return sha512.New
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- }
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- return nil
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-}
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-
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-func oidFromHash(hash crypto.Hash) (asn1.ObjectIdentifier, bool) {
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- switch hash {
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- case crypto.SHA1:
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- return oidSHA1, true
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- case crypto.SHA224:
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- return oidSHA224, true
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- case crypto.SHA256:
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- return oidSHA256, true
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- case crypto.SHA384:
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- return oidSHA384, true
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- case crypto.SHA512:
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- return oidSHA512, true
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- default:
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- return nil, false
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- }
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-}
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-
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-var (
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- asnAlgoSHA1 = asnHashFunction{
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- Algorithm: oidSHA1,
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- }
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- asnAlgoSHA224 = asnHashFunction{
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- Algorithm: oidSHA224,
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- }
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- asnAlgoSHA256 = asnHashFunction{
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- Algorithm: oidSHA256,
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- }
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- asnAlgoSHA384 = asnHashFunction{
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- Algorithm: oidSHA384,
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- }
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- asnAlgoSHA512 = asnHashFunction{
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- Algorithm: oidSHA512,
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- }
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-)
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-
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-// type ASNasnSubjectPublicKeyInfo struct {
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-//
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-// }
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-//
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-
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-type asnSubjectPublicKeyInfo struct {
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- Algorithm asn1.ObjectIdentifier
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- PublicKey asn1.BitString
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- Supplements ecpksSupplements `asn1:"optional"`
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-}
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-
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-type asnECPKAlgorithms struct {
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- Type asn1.ObjectIdentifier
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-}
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-
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-var idPublicKeyType = doScheme(ansiX962Scheme, []int{2})
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-var idEcPublicKey = doScheme(idPublicKeyType, []int{1})
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-var idEcPublicKeySupplemented = doScheme(idPublicKeyType, []int{0})
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-
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-func curveToRaw(curve elliptic.Curve) (rv asn1.RawValue, ok bool) {
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- switch curve {
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- case elliptic.P224(), elliptic.P256(), elliptic.P384(), elliptic.P521():
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- raw := rawCurve(curve)
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- return asn1.RawValue{
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- Tag: 30,
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- Bytes: raw[2:],
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- FullBytes: raw,
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- }, true
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- default:
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- return rv, false
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- }
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-}
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-
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-func asnECPublicKeyType(curve elliptic.Curve) (algo asnAlgorithmIdentifier, ok bool) {
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- raw, ok := curveToRaw(curve)
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- if !ok {
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- return
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- } else {
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- return asnAlgorithmIdentifier{Algorithm: idEcPublicKey,
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- Parameters: raw}, true
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- }
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-}
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-
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-type asnECPrivKeyVer int
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-
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-var asnECPrivKeyVer1 asnECPrivKeyVer = 1
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-
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-type asnPrivateKey struct {
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- Version asnECPrivKeyVer
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- Private []byte
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- Curve secgNamedCurve `asn1:"optional"`
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- Public asn1.BitString
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-}
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-
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-var asnECDH = doScheme(secgScheme, []int{12})
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-
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-type asnECDHAlgorithm asnAlgorithmIdentifier
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-
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-var (
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- dhSinglePass_stdDH_sha1kdf = asnECDHAlgorithm{
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- Algorithm: doScheme(x963Scheme, []int{2}),
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- }
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- dhSinglePass_stdDH_sha256kdf = asnECDHAlgorithm{
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- Algorithm: doScheme(secgScheme, []int{11, 1}),
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- }
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- dhSinglePass_stdDH_sha384kdf = asnECDHAlgorithm{
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- Algorithm: doScheme(secgScheme, []int{11, 2}),
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- }
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- dhSinglePass_stdDH_sha224kdf = asnECDHAlgorithm{
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- Algorithm: doScheme(secgScheme, []int{11, 0}),
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- }
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- dhSinglePass_stdDH_sha512kdf = asnECDHAlgorithm{
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- Algorithm: doScheme(secgScheme, []int{11, 3}),
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- }
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-)
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-
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-func (a asnECDHAlgorithm) Cmp(b asnECDHAlgorithm) bool {
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- if len(a.Algorithm) != len(b.Algorithm) {
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- return false
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- }
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- for i, _ := range a.Algorithm {
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- if a.Algorithm[i] != b.Algorithm[i] {
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- return false
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- }
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- }
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- return true
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-}
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-
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-// asnNISTConcatenation is the only supported KDF at this time.
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-type asnKeyDerivationFunction asnAlgorithmIdentifier
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-
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-var asnNISTConcatenationKDF = asnKeyDerivationFunction{
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- Algorithm: doScheme(secgScheme, []int{17, 1}),
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-}
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-
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-func (a asnKeyDerivationFunction) Cmp(b asnKeyDerivationFunction) bool {
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- if len(a.Algorithm) != len(b.Algorithm) {
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- return false
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- }
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- for i, _ := range a.Algorithm {
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- if a.Algorithm[i] != b.Algorithm[i] {
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- return false
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- }
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- }
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- return true
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-}
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-
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-var eciesRecommendedParameters = doScheme(secgScheme, []int{7})
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-var eciesSpecifiedParameters = doScheme(secgScheme, []int{8})
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-
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-type asnECIESParameters struct {
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- KDF asnKeyDerivationFunction `asn1:"optional"`
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- Sym asnSymmetricEncryption `asn1:"optional"`
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- MAC asnMessageAuthenticationCode `asn1:"optional"`
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-}
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-
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-type asnSymmetricEncryption asnAlgorithmIdentifier
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-
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-var (
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- aes128CTRinECIES = asnSymmetricEncryption{
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- Algorithm: doScheme(secgScheme, []int{21, 0}),
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- }
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- aes192CTRinECIES = asnSymmetricEncryption{
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- Algorithm: doScheme(secgScheme, []int{21, 1}),
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- }
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- aes256CTRinECIES = asnSymmetricEncryption{
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- Algorithm: doScheme(secgScheme, []int{21, 2}),
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- }
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-)
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-
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-func (a asnSymmetricEncryption) Cmp(b asnSymmetricEncryption) bool {
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- if len(a.Algorithm) != len(b.Algorithm) {
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- return false
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- }
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- for i, _ := range a.Algorithm {
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- if a.Algorithm[i] != b.Algorithm[i] {
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- return false
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- }
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- }
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- return true
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-}
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-
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-type asnMessageAuthenticationCode asnAlgorithmIdentifier
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-
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-var (
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- hmacFull = asnMessageAuthenticationCode{
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- Algorithm: doScheme(secgScheme, []int{22}),
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- }
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-)
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-
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-func (a asnMessageAuthenticationCode) Cmp(b asnMessageAuthenticationCode) bool {
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- if len(a.Algorithm) != len(b.Algorithm) {
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- return false
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- }
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- for i, _ := range a.Algorithm {
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- if a.Algorithm[i] != b.Algorithm[i] {
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- return false
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- }
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- }
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- return true
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-}
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-
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-type ecpksSupplements struct {
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- ECDomain secgNamedCurve
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- ECCAlgorithms eccAlgorithmSet
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-}
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-
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-type eccAlgorithmSet struct {
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- ECDH asnECDHAlgorithm `asn1:"optional"`
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- ECIES asnECIESParameters `asn1:"optional"`
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-}
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-
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-func marshalSubjectPublicKeyInfo(pub *PublicKey) (subj asnSubjectPublicKeyInfo, err error) {
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- subj.Algorithm = idEcPublicKeySupplemented
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- curve, ok := oidFromNamedCurve(pub.Curve)
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- if !ok {
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- err = ErrInvalidPublicKey
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- return
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- }
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- subj.Supplements.ECDomain = curve
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- if pub.Params != nil {
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- subj.Supplements.ECCAlgorithms.ECDH = paramsToASNECDH(pub.Params)
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- subj.Supplements.ECCAlgorithms.ECIES = paramsToASNECIES(pub.Params)
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- }
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- pubkey := elliptic.Marshal(pub.Curve, pub.X, pub.Y)
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- subj.PublicKey = asn1.BitString{
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- BitLength: len(pubkey) * 8,
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- Bytes: pubkey,
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- }
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- return
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-}
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-
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-// Encode a public key to DER format.
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-func MarshalPublic(pub *PublicKey) ([]byte, error) {
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- subj, err := marshalSubjectPublicKeyInfo(pub)
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- if err != nil {
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- return nil, err
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- }
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- return asn1.Marshal(subj)
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-}
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-
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-// Decode a DER-encoded public key.
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-func UnmarshalPublic(in []byte) (pub *PublicKey, err error) {
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- var subj asnSubjectPublicKeyInfo
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-
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- if _, err = asn1.Unmarshal(in, &subj); err != nil {
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- return
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- }
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- if !subj.Algorithm.Equal(idEcPublicKeySupplemented) {
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- err = ErrInvalidPublicKey
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- return
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- }
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- pub = new(PublicKey)
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- pub.Curve = namedCurveFromOID(subj.Supplements.ECDomain)
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- x, y := elliptic.Unmarshal(pub.Curve, subj.PublicKey.Bytes)
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- if x == nil {
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- err = ErrInvalidPublicKey
|
|
|
- return
|
|
|
- }
|
|
|
- pub.X = x
|
|
|
- pub.Y = y
|
|
|
- pub.Params = new(ECIESParams)
|
|
|
- asnECIEStoParams(subj.Supplements.ECCAlgorithms.ECIES, pub.Params)
|
|
|
- asnECDHtoParams(subj.Supplements.ECCAlgorithms.ECDH, pub.Params)
|
|
|
- if pub.Params == nil {
|
|
|
- if pub.Params = ParamsFromCurve(pub.Curve); pub.Params == nil {
|
|
|
- err = ErrInvalidPublicKey
|
|
|
- }
|
|
|
- }
|
|
|
- return
|
|
|
-}
|
|
|
-
|
|
|
-func marshalPrivateKey(prv *PrivateKey) (ecprv asnPrivateKey, err error) {
|
|
|
- ecprv.Version = asnECPrivKeyVer1
|
|
|
- ecprv.Private = prv.D.Bytes()
|
|
|
-
|
|
|
- var ok bool
|
|
|
- ecprv.Curve, ok = oidFromNamedCurve(prv.PublicKey.Curve)
|
|
|
- if !ok {
|
|
|
- err = ErrInvalidPrivateKey
|
|
|
- return
|
|
|
- }
|
|
|
-
|
|
|
- var pub []byte
|
|
|
- if pub, err = MarshalPublic(&prv.PublicKey); err != nil {
|
|
|
- return
|
|
|
- } else {
|
|
|
- ecprv.Public = asn1.BitString{
|
|
|
- BitLength: len(pub) * 8,
|
|
|
- Bytes: pub,
|
|
|
- }
|
|
|
- }
|
|
|
- return
|
|
|
-}
|
|
|
-
|
|
|
-// Encode a private key to DER format.
|
|
|
-func MarshalPrivate(prv *PrivateKey) ([]byte, error) {
|
|
|
- ecprv, err := marshalPrivateKey(prv)
|
|
|
- if err != nil {
|
|
|
- return nil, err
|
|
|
- }
|
|
|
- return asn1.Marshal(ecprv)
|
|
|
-}
|
|
|
-
|
|
|
-// Decode a private key from a DER-encoded format.
|
|
|
-func UnmarshalPrivate(in []byte) (prv *PrivateKey, err error) {
|
|
|
- var ecprv asnPrivateKey
|
|
|
-
|
|
|
- if _, err = asn1.Unmarshal(in, &ecprv); err != nil {
|
|
|
- return
|
|
|
- } else if ecprv.Version != asnECPrivKeyVer1 {
|
|
|
- err = ErrInvalidPrivateKey
|
|
|
- return
|
|
|
- }
|
|
|
-
|
|
|
- privateCurve := namedCurveFromOID(ecprv.Curve)
|
|
|
- if privateCurve == nil {
|
|
|
- err = ErrInvalidPrivateKey
|
|
|
- return
|
|
|
- }
|
|
|
-
|
|
|
- prv = new(PrivateKey)
|
|
|
- prv.D = new(big.Int).SetBytes(ecprv.Private)
|
|
|
-
|
|
|
- if pub, err := UnmarshalPublic(ecprv.Public.Bytes); err != nil {
|
|
|
- return nil, err
|
|
|
- } else {
|
|
|
- prv.PublicKey = *pub
|
|
|
- }
|
|
|
-
|
|
|
- return
|
|
|
-}
|
|
|
-
|
|
|
-// Export a public key to PEM format.
|
|
|
-func ExportPublicPEM(pub *PublicKey) (out []byte, err error) {
|
|
|
- der, err := MarshalPublic(pub)
|
|
|
- if err != nil {
|
|
|
- return
|
|
|
- }
|
|
|
-
|
|
|
- var block pem.Block
|
|
|
- block.Type = "ELLIPTIC CURVE PUBLIC KEY"
|
|
|
- block.Bytes = der
|
|
|
-
|
|
|
- buf := new(bytes.Buffer)
|
|
|
- err = pem.Encode(buf, &block)
|
|
|
- if err != nil {
|
|
|
- return
|
|
|
- } else {
|
|
|
- out = buf.Bytes()
|
|
|
- }
|
|
|
- return
|
|
|
-}
|
|
|
-
|
|
|
-// Export a private key to PEM format.
|
|
|
-func ExportPrivatePEM(prv *PrivateKey) (out []byte, err error) {
|
|
|
- der, err := MarshalPrivate(prv)
|
|
|
- if err != nil {
|
|
|
- return
|
|
|
- }
|
|
|
-
|
|
|
- var block pem.Block
|
|
|
- block.Type = "ELLIPTIC CURVE PRIVATE KEY"
|
|
|
- block.Bytes = der
|
|
|
-
|
|
|
- buf := new(bytes.Buffer)
|
|
|
- err = pem.Encode(buf, &block)
|
|
|
- if err != nil {
|
|
|
- return
|
|
|
- } else {
|
|
|
- out = buf.Bytes()
|
|
|
- }
|
|
|
- return
|
|
|
-}
|
|
|
-
|
|
|
-// Import a PEM-encoded public key.
|
|
|
-func ImportPublicPEM(in []byte) (pub *PublicKey, err error) {
|
|
|
- p, _ := pem.Decode(in)
|
|
|
- if p == nil || p.Type != "ELLIPTIC CURVE PUBLIC KEY" {
|
|
|
- return nil, ErrInvalidPublicKey
|
|
|
- }
|
|
|
-
|
|
|
- pub, err = UnmarshalPublic(p.Bytes)
|
|
|
- return
|
|
|
-}
|
|
|
-
|
|
|
-// Import a PEM-encoded private key.
|
|
|
-func ImportPrivatePEM(in []byte) (prv *PrivateKey, err error) {
|
|
|
- p, _ := pem.Decode(in)
|
|
|
- if p == nil || p.Type != "ELLIPTIC CURVE PRIVATE KEY" {
|
|
|
- return nil, ErrInvalidPrivateKey
|
|
|
- }
|
|
|
-
|
|
|
- prv, err = UnmarshalPrivate(p.Bytes)
|
|
|
- return
|
|
|
-}
|