feat(deps): remove the multicodec dependency, as varsig constants are not multicodec

constant.go

@@ -3,26 +3,23 @@ package varsig
 import (
 	"encoding/binary"
 	"fmt"
-
-	"github.com/multiformats/go-multicodec"
 )
 
-// Prefix is the multicodec.Code for the varsig's varuint prefix byte.
-const Prefix = uint64(multicodec.Varsig)
+// Prefix is the value for the varsig's varuint prefix byte.
+const Prefix = uint64(0x34)
 
-// HashAlgorithm is the multicodec.Code that specifies the hash algorithm
+// HashAlgorithm is the value that specifies the hash algorithm
 // that's used to reduce the signed content
 type HashAlgorithm uint64
 
-// Constant multicodec.Code values that allow Varsig implementations to
-// specify how the payload content is hashed before the signature is
-// generated.
+// Constant values that allow Varsig implementations to specify how
+// the payload content is hashed before the signature is generated.
 const (
 	HashAlgorithmUnspecified HashAlgorithm = 0x00
-	HashAlgorithmSHA256                    = HashAlgorithm(multicodec.Sha2_256)
-	HashAlgorithmSHA384                    = HashAlgorithm(multicodec.Sha2_384)
-	HashAlgorithmSHA512                    = HashAlgorithm(multicodec.Sha2_512)
-	HashAlgorithmShake256                  = HashAlgorithm(multicodec.Shake256)
+	HashAlgorithmSHA256                    = HashAlgorithm(0x12)
+	HashAlgorithmSHA384                    = HashAlgorithm(0x20)
+	HashAlgorithmSHA512                    = HashAlgorithm(0x13)
+	HashAlgorithmShake256                  = HashAlgorithm(0x19)
 )
 
 // DecodeHashAlgorithm reads and validates the expected hash algorithm
@@ -51,16 +48,16 @@ func DecodeHashAlgorithm(r BytesReader) (HashAlgorithm, error) {
 // consistent hashes and signatures.
 type PayloadEncoding uint64
 
-// Constant multicodec.Code values that allow Varsig implementations to
-// specify how the payload content is encoded before being hashed.  In
-// varsig >= v1, only canonical encoding is allowed.
+// Constant values that allow Varsig implementations to specify how the
+// payload content is encoded before being hashed.
+// In varsig >= v1, only canonical encoding is allowed.
 const (
 	PayloadEncodingUnspecified PayloadEncoding = 0x00
 	PayloadEncodingVerbatim    PayloadEncoding = 0x5f
-	PayloadEncodingDAGPB                       = PayloadEncoding(multicodec.DagPb)
-	PayloadEncodingDAGCBOR                     = PayloadEncoding(multicodec.DagCbor)
-	PayloadEncodingDAGJSON                     = PayloadEncoding(multicodec.DagJson)
-	PayloadEncodingEIP191                      = PayloadEncoding(multicodec.Eip191)
+	PayloadEncodingDAGPB                       = PayloadEncoding(0x70)
+	PayloadEncodingDAGCBOR                     = PayloadEncoding(0x71)
+	PayloadEncodingDAGJSON                     = PayloadEncoding(0x0129)
+	PayloadEncodingEIP191                      = PayloadEncoding(0xd191)
 	PayloadEncodingJWT         PayloadEncoding = 0x6a77
 )
 
@@ -112,8 +109,8 @@ func decodeEncodingInfoV1(payEnc PayloadEncoding) (PayloadEncoding, error) {
 	}
 }
 
-// Discriminator is (usually) the multicodec.Code representing the public
-// key type of the algorithm used to create the signature.
+// Discriminator is (usually) the value representing the public key type of
+// the algorithm used to create the signature.
 //
 // There is not set list of constants here, nor is there a decode function
 // as the author of an implementation should include the constant with the

eddsa.go

@@ -4,26 +4,24 @@ import (
 	"crypto/ed25519"
 	"encoding/binary"
 	"fmt"
-
-	"github.com/multiformats/go-multicodec"
 )
 
-// Constants containing multicodec.Code values that specify EdDSA signatures.
+// Constants containing values that specify EdDSA signatures.
 const (
-	DiscriminatorEdDSA   = Discriminator(multicodec.Ed25519Pub)
-	DiscriminatorEd25519 = Discriminator(multicodec.Ed25519Pub)
-	DiscriminatorEd448   = Discriminator(multicodec.Ed448Pub)
+	DiscriminatorEdDSA   = Discriminator(0xed)
+	DiscriminatorEd25519 = Discriminator(0xed)
+	DiscriminatorEd448   = Discriminator(0x1203)
 )
 
-// EdDSACurve are multicodec.Code values that specify which Edwards curve
-// is used when generating the signature.
+// EdDSACurve are values that specify which Edwards curve is used when
+// generating the signature.
 type EdDSACurve uint64
 
-// Constants describing the multicodec.Code for each specific Edwards
-// curve that can be encoded into a Varsig.
+// Constants describing the values for each specific Edwards curve that can
+// be encoded into a Varsig.
 const (
-	CurveEd25519 = EdDSACurve(multicodec.Ed25519Pub)
-	CurveEd448   = EdDSACurve(multicodec.Ed448Pub)
+	CurveEd25519 = EdDSACurve(0xed)
+	CurveEd448   = EdDSACurve(0x1203)
 )
 
 func decodeEdDSACurve(r BytesReader) (EdDSACurve, error) {
@@ -87,8 +85,8 @@ func (v EdDSAVarsig) Curve() EdDSACurve {
 	return v.curve
 }
 
-// HashAlgorithm returns the multicodec.Code describing the hash algorithm
-// used to hash the payload content before the signature is generated.
+// HashAlgorithm returns the value describing the hash algorithm used to hash
+// the payload content before the signature is generated.
 func (v EdDSAVarsig) HashAlgorithm() HashAlgorithm {
 	return v.hashAlg
 }

go.mod

@@ -2,10 +2,7 @@ module github.com/ucan-wg/go-varsig
 
 go 1.24.4
 
-require (
-	github.com/multiformats/go-multicodec v0.9.2
-	github.com/stretchr/testify v1.10.0
-)
+require github.com/stretchr/testify v1.10.0
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect

go.sum

@@ -6,8 +6,6 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/renameio v0.1.0 h1:GOZbcHa3HfsPKPlmyPyN2KEohoMXOhdMbHrvbpl2QaA=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/multiformats/go-multicodec v0.9.2 h1:YrlXCuqxjqm3bXl+vBq5LKz5pz4mvAsugdqy78k0pXQ=
-github.com/multiformats/go-multicodec v0.9.2/go.mod h1:LLWNMtyV5ithSBUo3vFIMaeDy+h3EbkMTek1m+Fybbo=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=

rsa.go

@@ -2,12 +2,10 @@ package varsig
 
 import (
 	"encoding/binary"
-
-	"github.com/multiformats/go-multicodec"
 )
 
-// DiscriminatorRSA is the multicodec.Code specifying an RSA signature.
-const DiscriminatorRSA = Discriminator(multicodec.RsaPub)
+// DiscriminatorRSA is the value specifying an RSA signature.
+const DiscriminatorRSA = Discriminator(0x1205)
 
 var _ Varsig = RSAVarsig{}