fix: remove unecessary ImplicitSha256Digest

Author: Gozala

src/cid.js

@@ -87,7 +87,7 @@ export class CID {
           throw new Error('Cannot convert non sha2-256 multihash CID to CIDv0')
         }
 
-        return createV0(Digest.decodeImplicitSha256(digest), this)
+        return createV0(Digest.decode(digest), this)
       }
     }
   }
@@ -317,7 +317,7 @@ export const decode = (cid, config) => {
   switch (version) {
     // CIDv0
     case 18: {
-      const multihash = Digest.decodeImplicitSha256(cid)
+      const multihash = Digest.decode(cid)
       return createV0(multihash, config)
     }
     // CIDv1
@@ -362,9 +362,7 @@ export const asCID = (value, config) => {
     // symbol we still rebase it to the this `CID` implementation by
     // delegating that to a constructor.
     const { version, multihash, code } = value
-    const digest = version === 0
-      ? Digest.decodeImplicitSha256(multihash)
-      : Digest.decode(multihash)
+    const digest = Digest.decode(multihash)
     return create(version, code, digest, config)
   } else {
     // Otherwise value is not a CID (or an incompatible version of it) in

src/hashes/digest.js

@@ -40,18 +40,6 @@ export const decode = (multihash) => {
   return new Digest(code, size, digest, bytes)
 }
 
-/**
- * Turns bytes representation of multihash digest into an instance.
- * @param {Uint8Array} hash
- */
-export const decodeImplicitSha256 = (hash) => {
-  if (hash.byteLength !== SHA256_SIZE) {
-    throw new Error('Given hash has incorrect length')
-  }
-
-  return new ImplicitSha256Digest(hash)
-}
-
 /**
  * @param {MultihashDigest} a
  * @param {MultihashDigest} b
@@ -65,9 +53,6 @@ export const equals = (a, b) => {
   }
 }
 
-const SHA256_SIZE = 32
-const SHA256_CODE = 0x12
-
 /**
  * @typedef {import('./interface').MultihashDigest} MultihashDigest
  */
@@ -95,17 +80,3 @@ export class Digest {
     this.bytes = bytes
   }
 }
-
-/**
- * @class
- * @implements {MultihashDigest}
- * @extends {Digest<0x12, 32>}
- */
-class ImplicitSha256Digest extends Digest {
-  /**
-   * @param {Uint8Array} digest
-   */
-  constructor (digest) {
-    super(SHA256_CODE, SHA256_SIZE, digest, digest)
-  }
-}