commit a48ca25841777916f6247cb6c5a17e505a5f1e90
Author: Pablo Ovelleiro Corral <mail@pablo.tools>
Date:   Wed Mar 20 20:34:29 2024 +0100

    initial commit

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..5891455
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,15 @@
+module gpg2age
+
+go 1.21.7
+
+require (
+	github.com/Mic92/ssh-to-age v0.0.0-20240304065525-796b05d6e3b3
+	github.com/ProtonMail/go-crypto v1.0.0
+	github.com/davecgh/go-spew v1.1.1
+	golang.org/x/crypto v0.20.0
+)
+
+require (
+	github.com/cloudflare/circl v1.3.3 // indirect
+	golang.org/x/sys v0.17.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..64ef460
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,56 @@
+github.com/Mic92/ssh-to-age v0.0.0-20240304065525-796b05d6e3b3 h1:YT+DB0TTQ/Li1AQOAAP20k2kCT3XndzsprKgTg5GCIc=
+github.com/Mic92/ssh-to-age v0.0.0-20240304065525-796b05d6e3b3/go.mod h1:M/OUOt0/3WI/tYzEYBhQNyU5OB1YStcJEkUaTDnjxJI=
+github.com/ProtonMail/go-crypto v1.0.0 h1:LRuvITjQWX+WIfr930YHG2HNfjR1uOfyf5vE0kC2U78=
+github.com/ProtonMail/go-crypto v1.0.0/go.mod h1:EjAoLdwvbIOoOQr3ihjnSoLZRtE8azugULFRteWMNc0=
+github.com/bwesterb/go-ristretto v1.2.3/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
+github.com/cloudflare/circl v1.3.3 h1:fE/Qz0QdIGqeWfnwq0RE0R7MI51s0M2E4Ga9kq5AEMs=
+github.com/cloudflare/circl v1.3.3/go.mod h1:5XYMA4rFBvNIrhs50XuiBJ15vF2pZn4nnUKZrLbUZFA=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.3.1-0.20221117191849-2c476679df9a/go.mod h1:hebNnKkNXi2UzZN1eVRvBB7co0a+JxK6XbPiWVs/3J4=
+golang.org/x/crypto v0.7.0/go.mod h1:pYwdfH91IfpZVANVyUOhSIPZaFoJGxTFbZhFTx+dXZU=
+golang.org/x/crypto v0.20.0 h1:jmAMJJZXr5KiCw05dfYK9QnqaqKLYXijU23lsEdcQqg=
+golang.org/x/crypto v0.20.0/go.mod h1:Xwo95rrVNIoSMx9wa1JroENMToLWn3RNVrTBpLHgZPQ=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.2.0/go.mod h1:KqCZLdyyvdV855qA2rE3GC2aiw5xGR5TEjj8smXukLY=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
+golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/term v0.6.0/go.mod h1:m6U89DPEgQRMq3DNkDClhWw02AUbt2daBVO4cn4Hv9U=
+golang.org/x/term v0.17.0 h1:mkTF7LCd6WGJNL3K1Ad7kwxNfYAW6a8a8QqtMblp/4U=
+golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..309c09f
--- /dev/null
+++ b/main.go
@@ -0,0 +1,112 @@
+package main
+
+import (
+	// "bytes"
+	"crypto/sha512"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/ProtonMail/go-crypto/openpgp"
+	"github.com/ProtonMail/go-crypto/openpgp/armor"
+	"github.com/ProtonMail/go-crypto/openpgp/eddsa"
+	"github.com/ProtonMail/go-crypto/openpgp/packet"
+	 "github.com/davecgh/go-spew/spew"
+	"golang.org/x/crypto/ssh"
+
+	"strings"
+
+	"crypto/ed25519"
+	"errors"
+	"reflect"
+
+	// "filippo.io/edwards25519"
+	"github.com/Mic92/ssh-to-age/bech32"
+	"golang.org/x/crypto/curve25519"
+	// "golang.org/x/crypto/curve25519"
+)
+
+func readEntity(keypath string) (*openpgp.Entity, error) {
+	f, err := os.Open(keypath)
+	if err != nil {
+		log.Println("Error opening file")
+		return nil, err
+	}
+	defer f.Close()
+	block, err := armor.Decode(f)
+	if err != nil {
+		log.Println("decoding")
+		return nil, err
+	}
+	return openpgp.ReadEntity(packet.NewReader(block.Body))
+}
+
+var (
+	UnsupportedKeyType = errors.New("only ed25519 keys are supported")
+)
+
+func ed25519PrivateKeyToCurve25519(pk ed25519.PrivateKey) ([]byte, error) {
+	h := sha512.New()
+	_, err := h.Write(pk.Seed())
+	if err != nil {
+		return []byte{}, err
+	}
+	out := h.Sum(nil)
+	return out[:curve25519.ScalarSize], nil
+}
+
+func SSHPrivateKeyToAge(sshKey, passphrase []byte) (*string, error) {
+	var (
+		privateKey interface{}
+		err        error
+	)
+	if len(passphrase) > 0 {
+		privateKey, err = ssh.ParseRawPrivateKeyWithPassphrase(sshKey, passphrase)
+	} else {
+		privateKey, err = ssh.ParseRawPrivateKey(sshKey)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse ssh private key: %w", err)
+	}
+
+	ed25519Key, ok := privateKey.(*ed25519.PrivateKey)
+	if !ok {
+		return nil, fmt.Errorf("got %s key type but: %w", reflect.TypeOf(privateKey), UnsupportedKeyType)
+	}
+
+	bytes, err := ed25519PrivateKeyToCurve25519(*ed25519Key) //THIS
+	if err != nil {
+		return nil, err
+	}
+
+	s, err := bech32.Encode("AGE-SECRET-KEY-", bytes)
+	if err != nil {
+		return nil, err
+	}
+	s = strings.ToUpper(s)
+	return &s, nil
+}
+
+func main() {
+
+	e, err := readEntity("test-key.asc")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	log.Println(reflect.TypeOf(e.PrivateKey.PrivateKey))
+
+	castkey, ok := e.PrivateKey.PrivateKey.(*eddsa.PrivateKey)
+	if !ok {
+		log.Fatal("failed to cast")
+	}
+	spew.Dump(castkey)
+
+	agekey, err := SSHPrivateKeyToAge(castkey.D, []byte{})
+
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println(agekey)
+
+}
diff --git a/test-key.asc b/test-key.asc
new file mode 100644
index 0000000..28b6294
--- /dev/null
+++ b/test-key.asc
@@ -0,0 +1,15 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+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+=UGWS
+-----END PGP PRIVATE KEY BLOCK-----