Copy go-bip39 into internal/bip39 (closes #42)

go-bip39 is gone from GitHub, so keyfunc now carries the part of
v1.1.0 it uses, with the upstream LICENSE beside it, and imports it
from internal/bip39. Upstream's tests and test vectors for the kept
code come along unchanged.

Changes beyond the trimming are what the linter asked for: the
package-level variables moved into the functions that use them, three
error strings were lower-cased, and the unknown-word error now wraps
ErrInvalidMnemonic.

go.mod no longer requires go-bip39. go mod tidy keeps its two go.sum
lines, because a test in sneak/secret's bip85 package imports it, and
drops five lines that only go-bip39's own requirements needed.

Model: opus-5-5

README.md

@@ -6,7 +6,7 @@ identities and child mnemonics, each of which can be recreated from that
 mnemonic at any time. The same mnemonic, key type and index always give the same
 key.
 
-It uses the BIP-85 entropy deriver from `sneak.berlin/go/secret/pkg/bip85` and
+It uses the BIP-85 entropy deriver from `git.eeqj.de/sneak/secret/pkg/bip85` and
 takes the same steps as that repository's `agehd` package.
 
 Commands are grouped by what is derived: `keyfunc ssh ...` for ed25519 SSH keys,

go.mod

@@ -4,13 +4,13 @@ go 1.26.0
 
 require (
 	filippo.io/age v1.3.2
+	git.eeqj.de/sneak/secret v0.0.0-20260810132333-41cea400a7fd
 	github.com/btcsuite/btcd v0.25.0
 	github.com/btcsuite/btcd/btcutil v1.2.0
 	github.com/spf13/cobra v1.10.2
 	github.com/stretchr/testify v1.12.1
 	golang.org/x/crypto v0.57.0
 	golang.org/x/term v0.46.0
-	sneak.berlin/go/secret v0.0.0-20261007105610-ef0ae90768c8
 )
 
 require (

go.sum

@@ -4,6 +4,8 @@ filippo.io/age v1.3.2 h1:r6RSZLFSMm6rzKepZ7ZAYkKCu14f3/Me8c7uKYh7C8c=
 filippo.io/age v1.3.2/go.mod h1:TH/Yr2sSRhCKbaH4XPxpUV0Us8Gv6txYUpiZQWz8Evk=
 filippo.io/hpke v0.4.0 h1:p575VVQ6ted4pL+it6M00V/f2qTZITO0zgmdKCkd5+A=
 filippo.io/hpke v0.4.0/go.mod h1:EmAN849/P3qdeK+PCMkDpDm83vRHM5cDipBJ8xbQLVY=
+git.eeqj.de/sneak/secret v0.0.0-20260810132333-41cea400a7fd h1:6YFV6horz2wDFPWWhour8qx8gLGyO0qoplwEeOuQ2J4=
+git.eeqj.de/sneak/secret v0.0.0-20260810132333-41cea400a7fd/go.mod h1:gKCcMZvlBOqusn/BxR8IyFmSJQr6R4vvjJ926iNpOSI=
 github.com/btcsuite/btcd v0.25.0 h1:JPbjwvHGpSywBRuorFFqTjaVP4y6Qw69XJ1nQ6MyWJM=
 github.com/btcsuite/btcd v0.25.0/go.mod h1:qbPE+pEiR9643E1s1xu57awsRhlCIm1ZIi6FfeRA4KE=
 github.com/btcsuite/btcd/btcec/v2 v2.5.0 h1:KioMXOWa76b86sTZZOmbzv/ldaQCmB8KFAyn5PbB8E8=
@@ -28,6 +30,8 @@ github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
 github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
 github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
+github.com/tyler-smith/go-bip39 v1.1.0 h1:5eUemwrMargf3BSLRRCalXT93Ns6pQJIjYQN2nyfOP8=
+github.com/tyler-smith/go-bip39 v1.1.0/go.mod h1:gUYDtqQw1JS3ZJ8UWVcGTGqqr6YIN3CWg+kkNaLt55U=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
 go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
@@ -38,5 +42,3 @@ golang.org/x/sys v0.48.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=
 golang.org/x/term v0.46.0 h1:3+OXuTbaKDgwk8jTi3aSLHRlmWqHEUDUtxnbFigO4YE=
 golang.org/x/term v0.46.0/go.mod h1:+K02xbkittuwc0Am4abfA3Fc+XRGXkvBXNO88NCXPoc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-sneak.berlin/go/secret v0.0.0-20261007105610-ef0ae90768c8 h1:Bd2bUsRCN8xhcrpH3LpJqHxR2QffeOuF5z76iP4BFnw=
-sneak.berlin/go/secret v0.0.0-20261007105610-ef0ae90768c8/go.mod h1:uVx9ZuE7ZMIOBY2B1ElXCs97CTsEfuham3NQRdLj5lI=

internal/bip39/bip39_internal_test.go

@@ -56,104 +56,6 @@ func TestPadByteSlice(t *testing.T) {
 	assertEqualByteSlices(t, []byte{1, 1, 1}, padByteSlice([]byte{1, 1, 1}, 2))
 }
 
-//nolint:funlen // the test vectors, kept as upstream wrote them
-func TestMnemonicToByteArrayForZeroLeadingSeeds(t *testing.T) {
-	t.Parallel()
-
-	ms := []string{
-		"00000000000000000000000000000000",
-		"00a84c51041d49acca66e6160c1fa999",
-		"00ca45df1673c76537a2020bfed1dafd",
-		"0019d5871c7b81fd83d474ef1c1e1dae",
-		"00dcb021afb35ffcdd1d032d2056fc86",
-		"0062be7bd09a27288b6cf0eb565ec739",
-		"00dc705b5efa0adf25b9734226ba60d4",
-		"0017747418d54c6003fa64fade83374b",
-		"000d44d3ee7c3dfa45e608c65384431b",
-		"008241c1ef976b0323061affe5bf24b9",
-		"00a6aec77e4d16bea80b50a34991aaba",
-		"0011527b8c6ddecb9d0c20beccdeb58d",
-		"001c938c503c8f5a2bba2248ff621546",
-		"0002f90aaf7a8327698f0031b6317c36",
-		"00bff43071ed7e07f77b14f615993bac",
-		"00da143e00ef17fc63b6fb22dcc2c326",
-		"00ffc6764fb32a354cab1a3ddefb015d",
-		"0062ef47e0985e8953f24760b7598cdd",
-		"003bf9765064f71d304908d906c065f5",
-		"00993851503471439d154b3613947474",
-		"007ad0ffe9eae753a483a76af06dfa67",
-		"00091824db9ec19e663bee51d64c83cc",
-		"00f48ac621f7e3cb39b2012ac3121543",
-		"0072917415cdca24dfa66c4a92c885b4",
-		"0027ced2b279ea8a91d29364487cdbf4",
-		"00b9c0d37fb10ba272e55842ad812583",
-		"004b3d0d2b9285946c687a5350479c8c",
-		"00c7c12a37d3a7f8c1532b17c89b724c",
-		"00f400c5545f06ae17ad00f3041e4e26",
-		"001e290be10df4d209f247ac5878662b",
-		"00bf0f74568e582a7dd1ee64f792ec8b",
-		"00d2e43ecde6b72b847db1539ed89e23",
-		"00cecba6678505bb7bfec8ed307251f6",
-		"000aeed1a9edcbb4bc88f610d3ce84eb",
-		"00d06206aadfc25c2b21805d283f15ae",
-		"00a31789a2ab2d54f8fadd5331010287",
-		"003493c5f520e8d5c0483e895a121dc9",
-		"004706112800b76001ece2e268bc830e",
-		"00ab31e28bb5305be56e38337dbfa486",
-		"006872fe85df6b0fa945248e6f9379d1",
-		"00717e5e375da6934e3cfdf57edaf3bd",
-		"007f1b46e7b9c4c76e77c434b9bccd6b",
-		"00dc93735aa35def3b9a2ff676560205",
-		"002cd5dcd881a49c7b87714c6a570a76",
-		"0013b5af9e13fac87e0c505686cfb6bf",
-		"007ab1ec9526b0bc04b64ae65fd42631",
-		"00abb4e11d8385c1cca905a6a65e9144",
-		"00574fc62a0501ad8afada2e246708c3",
-		"005207e0a815bb2da6b4c35ec1f2bf52",
-		"00f3460f136fb9700080099cbd62bc18",
-		"007a591f204c03ca7b93981237112526",
-		"00cfe0befd428f8e5f83a5bfc801472e",
-		"00987551ac7a879bf0c09b8bc474d9af",
-		"00cadd3ce3d78e49fbc933a85682df3f",
-		"00bfbf2e346c855ccc360d03281455a1",
-		"004cdf55d429d028f715544ce22d4f31",
-		"0075c84a7d15e0ac85e1e41025eed23b",
-		"00807dddd61f71725d336cab844d2cb5",
-		"00422f21b77fe20e367467ed98c18410",
-		"00b44d0ac622907119c626c850a462fd",
-		"00363f5e7f22fc49f3cd662a28956563",
-		"000fe5837e68397bbf58db9f221bdc4e",
-		"0056af33835c888ef0c22599686445d3",
-		"00790a8647fd3dfb38b7e2b6f578f2c6",
-		"00da8d9009675cb7beec930e263014fb",
-		"00d4b384540a5bb54aa760edaa4fb2fe",
-		"00be9b1479ed680fdd5d91a41eb926d0",
-		"009182347502af97077c40a6e74b4b5c",
-		"00f5c90ee1c67fa77fd821f8e9fab4f1",
-		"005568f9a2dd6b0c0cc2f5ba3d9cac38",
-		"008b481f8678577d9cf6aa3f6cd6056b",
-		"00c4323ece5e4fe3b6cd4c5c932931af",
-		"009791f7550c3798c5a214cb2d0ea773",
-		"008a7baab22481f0ad8167dd9f90d55c",
-		"00f0e601519aafdc8ff94975e64c946d",
-		"0083b61e0daa9219df59d697c270cd31",
-	}
-
-	for _, m := range ms {
-		seed, _ := hex.DecodeString(m)
-
-		mnemonic, err := NewMnemonic(seed)
-		if err != nil {
-			t.Errorf("%v", err)
-		}
-
-		_, err = EntropyFromMnemonic(mnemonic)
-		if err != nil {
-			t.Errorf("Failed for %x - %v", seed, mnemonic)
-		}
-	}
-}
-
 func TestEntropyFromMnemonic128(t *testing.T) {
 	t.Parallel()
 

internal/childmnemonic/childmnemonic.go

@@ -5,10 +5,10 @@ import (
 	"errors"
 	"fmt"
 
+	"git.eeqj.de/sneak/secret/pkg/bip85"
 	"github.com/btcsuite/btcd/btcutil/hdkeychain"
 	"sneak.berlin/go/keyfunc/internal/bip39"
 	"sneak.berlin/go/keyfunc/internal/derive"
-	"sneak.berlin/go/secret/pkg/bip85"
 )
 
 // english is the number BIP-85 gives the English word list.

internal/derive/derive.go

@@ -5,10 +5,10 @@ import (
 	"errors"
 	"fmt"
 
+	"git.eeqj.de/sneak/secret/pkg/bip85"
 	"github.com/btcsuite/btcd/btcutil/hdkeychain"
 	"github.com/btcsuite/btcd/chaincfg"
 	"sneak.berlin/go/keyfunc/internal/bip39"
-	"sneak.berlin/go/secret/pkg/bip85"
 )
 
 const (