Incorrect recursive encoding of nested bytes arrays (`bytes[]`) in apitypes

[pythonberg1997]

System information

Geth version: v1.14.12
CL client & version: Not related
OS & Version: OSX
Commit hash : (if develop)

Expected behaviour

Encode successfully

Actual behaviour

Get error:

failed to pack and hash typedData primary type: provided data '65' doesn't match type 'bytes'

Steps to reproduce the behaviour

1. Consider a message with a field sigs of type bytes[] in Solidity. In Go, this is represented as [][]uint8.

2. The func (typedData *TypedData) EncodeData(primaryType string, data map[string]interface{}, depth int) method recursively encodes each field. When it encounters the sigs array, it correctly identifies it as an array due to the trailing "]" in the type string.

3. encodeArrayValue is called, receiving the [][]uint8 as arrayValue and bytes as parsedType (correctly parsed from bytes[]).

4. The problem arises within the loop of encodeArrayValue. Each item in arrayValue (which is a []uint8 representing a Solidity bytes) is incorrectly treated as another array. This triggers a recursive call to encodeArrayValue.

5. In the second, erroneous encodeArrayValue call, the []uint8 is further split into individual uint8 values. The parsedType remains bytes (because strings.Split("bytes", "[")[0] is still bytes). This leads to an error because a single uint8 cannot be parsed as bytes.

Backtrace

[backtrace]

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