fix(ext/node): fix Decipheriv when autoPadding disabled (#25598)

This change fixes Decipheriv behavior when autoPadding disabled and enabled.

By this change, the example given in
https://github.com/denoland/deno/issues/20924#issuecomment-2345931295
works in the same way as Node.

closes #20924

1 files changed, 6 insertions, 1 deletions

diff --git a/ext/node/polyfills/internal/crypto/cipher.ts b/ext/node/polyfills/internal/crypto/cipher.ts
index a1449cd87..c1c5ce890 100644
--- a/ext/node/polyfills/internal/crypto/cipher.ts
+++ b/ext/node/polyfills/internal/crypto/cipher.ts
@@ -306,6 +306,10 @@ class BlockModeCache {
     this.cache = this.cache.subarray(len);
     return out;
   }
+
+  set lastChunkIsNonZero(value: boolean) {
+    this.#lastChunkIsNonZero = value;
+  }
 }
 
 export class Decipheriv extends Transform implements Cipher {
@@ -338,7 +342,7 @@ export class Decipheriv extends Transform implements Cipher {
       },
       ...options,
     });
-    this.#cache = new BlockModeCache(true);
+    this.#cache = new BlockModeCache(this.#autoPadding);
     this.#context = op_node_create_decipheriv(cipher, toU8(key), toU8(iv));
     this.#needsBlockCache =
       !(cipher == "aes-128-gcm" || cipher == "aes-256-gcm");
@@ -386,6 +390,7 @@ export class Decipheriv extends Transform implements Cipher {
 
   setAutoPadding(autoPadding?: boolean): this {
     this.#autoPadding = Boolean(autoPadding);
+    this.#cache.lastChunkIsNonZero = this.#autoPadding;
     return this;
   }