{
  "$schema": "../../schema/test-vector.schema.json",
  "name": "Encrypted Payload - AES Block Padding",
  "spec_ref": "src/06-payload-encrypted.md",
  "protocol_version": 0,
  "description": "Tests AES-128-ECB zero-padding behavior at block boundaries. Plaintexts of 1, 15, 16, 17, and 32 bytes exercise all padding edge cases.",
  "vectors": [
    {
      "id": "pad-001",
      "description": "1-byte plaintext: padded with 15 zero bytes",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "txt_msg",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "dest_hash": "AB",
          "src_hash": "CD",
          "cipher_mac": "83FB",
          "ciphertext": "2D4135E80761429386BFE3833C535AA8"
        }
      },
      "binary": "09 00 ABCD 83FB 2D4135E80761429386BFE3833C535AA8",
      "crypto_context": {
        "shared_secret": "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F",
        "encryption_key": "000102030405060708090A0B0C0D0E0F",
        "plaintext": "42"
      },
      "notes": "1 byte padded to 16: 42 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00. 1 AES block output."
    },
    {
      "id": "pad-002",
      "description": "16-byte plaintext: no padding needed (exact block boundary)",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "txt_msg",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "dest_hash": "AB",
          "src_hash": "CD",
          "cipher_mac": "631C",
          "ciphertext": "0A940BB5416EF045F1C39458C653EA5A"
        }
      },
      "binary": "09 00 ABCD 631C 0A940BB5416EF045F1C39458C653EA5A",
      "crypto_context": {
        "shared_secret": "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F",
        "encryption_key": "000102030405060708090A0B0C0D0E0F",
        "plaintext": "000102030405060708090A0B0C0D0E0F"
      },
      "notes": "Exactly 16 bytes: no padding. 1 AES block output."
    },
    {
      "id": "pad-003",
      "description": "17-byte plaintext: 1 byte in second block, padded with 15 zeros",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "txt_msg",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "dest_hash": "AB",
          "src_hash": "CD",
          "cipher_mac": "9822",
          "ciphertext": "0A940BB5416EF045F1C39458C653EA5A299F7C29A3E13AE7F64ECBA062FC7560"
        }
      },
      "binary": "09 00 ABCD 9822 0A940BB5416EF045F1C39458C653EA5A299F7C29A3E13AE7F64ECBA062FC7560",
      "crypto_context": {
        "shared_secret": "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F",
        "encryption_key": "000102030405060708090A0B0C0D0E0F",
        "plaintext": "000102030405060708090A0B0C0D0E0F10"
      },
      "notes": "17 bytes spans 2 blocks. Block 2 = 10 00 00 ... 00. 32 bytes ciphertext."
    }
  ]
}