Session: glimmering-popping-crescent-subagent-a92753b — 2026-02-04

Project: pro-desktop · Branch: master · Mode: ` · **Model:**claude-haiku-4-5-20251001`

Stats: 1 user messages, 18 tool calls, tools used: Glob, Grep, Bash, Read.

Conversation

Turn 1 — User

Find the VAU Service implementation in the codebase. I need to understand: 1. Where is the VAU Service located? 2. What does it do? 3. Look for any recent changes related to OCSP removal (possibly related to ticket FHIR-1818) 4. Find the main entry points and key files

Search for "VAU", "vau-service", "VAUService" and related terms. Provide file paths and code context.

Turn 1 — Assistant

I'll help you find the VAU Service implementation in the codebase. Let me search for it systematically.

Tools used:

• Glob: **/*vau*

Tools used:

• Grep: VAU|vau-service|VAUService in **/*.{ts,tsx,js,json,md}

Tools used:

• Bash: find . -type d -name "*vau*" 2>/dev/null

Tool results:

→ result (ok): Found 29 files docs/releases/releases-by-date.md docs/releases/global/2025/10-October/v2.81.0.md docs/releases/global/2025/09-September/v2.76.0.md docs/releases/global/2025/05-May/v2.63.0.md docs/releases/global/2025/01-January/v2.48.0.md docs/modules/module-testing-matrix.md docs/modules/module-catalog.md config/env.ts src/modules/gematik-idp-vau/services/tests_electron/vauValidation.test.ts src/modules/gematik-idp-vau/services/vauValidation.ts src/modules/gematik-idp-vau/services/vauServic …(truncated, 1087 more chars)

Tools used:

• Bash: git log --all --oneline --grep="OCSP\|FHIR-1818" | head -20

Tool results:

→ result (ok): 56f92d7ed feat(FHIR-1739): Implement crypto adapter with docto-crypt CLI integration 73e46267f fix(fhir-1818): Deprecate VAU OCSP verification (#6275) 8026d61c7 fix(FHIR-1722): idp-vau auth error (#6071) 53d6cb6bf test: Add comprehensive tests for CertificateService.verifyCertificate parameter validation 862486b39 chore(lion-747): update dependencies (#6061) 81f859d7f FHIR-619: Verify VAU OCSP response signature (#4119) c12e97551 FHIR-526: Verify eRP Specialist Service public encryption certific …(truncated, 11 more chars)

Tool results:

→ result (ok): /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauClient.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/tests_electron/vauClient.test.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/tests_electron/vauUtils.test.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauUtils.ts /Users/USER/workspace/doctolib/doctolib-pro-de …(truncated, 1119 more chars)

Tool results:

→ result (ok): ./coverage/unit/lcov-report/src/modules/gematik-idp-vau ./src/modules/gematik-idp-vau

Great! I found the VAU Service and a commit related to FHIR-1818. Let me examine the main files and look for the OCSP changes:

Tools used:

• Read: /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauService.ts

Tool results:

→ result (ok): 1→import { X509Certificate } from 'node:crypto' 2→import { ParsedHttpResponse } from 'http-message-parser' 3→ 4→import ConfigurationService from '@module/kbv-ti-connect/services/configuration-service' 5→import { JWKKeyStore } from '@module/gematik-crypto' 6→import type { PublicEncryptionKey } from '@module/gematik-crypto' 7→ 8→import { HeaderValues } from '../constants/types' 9→import { VauClient } from './vauClient' 10→import { VauValidation } from '. …(truncated, 2941 more chars)

Tools used:

• Read: /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/README.md

Tool results:

→ result (ok): 1→# Gematik IDP VAU Module 2→ 3→Gematik is moving towards Telematik Infrastruktur 2.0, where Specialist Services are more accessible, and the reliance 4→on Konnektors for communication with the TI is being reduced. 5→ 6→The VAU (Vertrauenswürdige Ausführungsumgebung) or the Trusted Execution Environment is a secure communication channel 7→used to communicate with TI infrastructure, after authentication with the TI Identity Provider (IDP) service. 8→(See module …(truncated, 1364 more chars)

Tools used:

• Read: /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauClient.ts

Tool results:

→ result (ok): 1→import { Headers } from 'electron-fetch' 2→import { Buffer } from 'node:buffer' 3→ 4→import { fetch } from '@core/network/services/network' 5→ 6→import { TiEnvProvider } from '@module/gematik-ti-environment' 7→import { 8→ VAU_API_ERROR, 9→ VAU_OCSP_REQUEST_ERROR, 10→ VAU_FETCH_CERTIFICATE_ERROR, 11→} from '@module/gematik-idp-vau/constants/constants' 12→import { HeaderValues, VAUResponse } from '@module/gematik-idp-vau/constants/types'

…(truncated, 3034 more chars)

Tools used:

• Bash: git show 73e46267f --stat

Tool results:

→ result (ok): commit 73e46267f967cdf24aa6f3b92c923af0c6fab90b Author: Sergei Avanesov <<REDACTED>> Date: Tue Sep 30 17:58:48 2025 +0200

fix(fhir-1818): Deprecate VAU OCSP verification (#6275)

## Link to the ticket task

https://doctolib.atlassian.net/browse/FHIR-1818

## Description


https://github.com/gematik/api-erp/blob/master/docs/authentisieren.adoc#verbindungsaufbau-zum-e-rezept-fachdienst

The OCSP check for VAU certificate is deprecated and it is no

…(truncated, 625 more chars)

Now let me look at the validation and utilities files to get a complete picture:

Tools used:

• Read: /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauValidation.ts

Tool results:

→ result (ok): 1→import { BasicOCSPResponse, Certificate, OCSPResponse } from 'pkijs' 2→ 3→import { CertificateService } from '@module/kbv-ti-connect/services/certificate-service' 4→import ConfigurationService from '@module/kbv-ti-connect/services/configuration-service' 5→import { 6→ EMPTY_RESPONSE_BYTES_ERROR, 7→ ENCRYPTION_CERTIFICATE_REVOCATION_ERROR, 8→ VAU_ENCRYPTION_CERTIFICATE_INVALID_ERROR, 9→} from '@module/gematik-idp-vau/constants/constants' 10→import t …(truncated, 3820 more chars)

Tools used:

• Read: /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauUtils.ts

Tool results:

→ result (ok): 1→import { cipher, util } from '@doctolib/node-forge' 2→import { httpMessageParser } from 'http-message-parser' 3→import { Buffer } from 'node:buffer' 4→ 5→import { ParsedVAUResponseBody } from '../constants/types' 6→ 7→// see A_20163 - E-Prescription VAU, user request, decryption and encryption in 8→// https://fachportal.gematik.de/fachportal-import/files/gemSpec_Krypt_V2.19.0.pdf 9→// Adapted from: 10→// https://github.com/gematik/ref-erp-client-cs/b …(truncated, 3710 more chars)

Tools used:

• Read: /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/constants/types.ts

Tool results:

→ result (ok): 1→import { ParsedHttpResponse } from 'http-message-parser' 2→ 3→// see A_20163 (8) - E-Prescription VAU, user request, decryption and encryption in 4→// https://fachportal.gematik.de/fachportal-import/files/gemSpec_Krypt_V2.19.0.pdf 5→// Documentation mentions that only headers and body are encrypted but 6→// test example suggests that status line is also included 7→export interface ParsedVAUResponseBody { 8→ requestId: string 9→ response: ParsedHttpResp …(truncated, 654 more chars)

Tools used:

• Bash: git show 73e46267f

Tool results:

→ result (ok): commit 73e46267f967cdf24aa6f3b92c923af0c6fab90b Author: Sergei Avanesov <<REDACTED>> Date: Tue Sep 30 17:58:48 2025 +0200

fix(fhir-1818): Deprecate VAU OCSP verification (#6275)

## Link to the ticket task

https://doctolib.atlassian.net/browse/FHIR-1818

## Description


https://github.com/gematik/api-erp/blob/master/docs/authentisieren.adoc#verbindungsaufbau-zum-e-rezept-fachdienst

The OCSP check for VAU certificate is deprecated and it is no

…(truncated, 4193 more chars)

Let me also check the directory structure and constants:

Tools used:

• Bash: find /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau -type f -name "*.ts" | grep -v test | grep -v coverage | sort

Tool results:

→ result (ok): /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/constants/constants.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/constants/typename.d.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/constants/types.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/encryption.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/en …(truncated, 530 more chars)

Tools used:

• Read: /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/constants/constants.ts

Tool results:

→ result (ok): 1→export const VAU_API_ERROR = 'An error occurred during request to VAU.' 2→export const VAU_FETCH_CERTIFICATE_ERROR = 'An error occurred while fetching VAU public certificate.' 3→export const VAU_OCSP_REQUEST_ERROR = 'An error occurred while fetch OCSP response from VAU.' 4→export const VAU_ENCRYPTION_CERTIFICATE_INVALID_ERROR = 'The retrieved VAU encryption certificate is not valid' 5→export const EMPTY_RESPONSE_BYTES_ERROR = 'No "ResponseBytes" in the OCSP Response - nothi …(truncated, 482 more chars)

Tools used:

• Bash: find /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau -type f | head -20

Tool results:

→ result (ok): /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/constants/types.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/constants/constants.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/constants/typename.d.ts /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/README.md /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauValidation.t …(truncated, 1749 more chars)

Let me check the encryption.ts file and look for any index or main entry point:

Tools used:

• Read: /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/encryption.ts

Tool results:

→ result (ok): 1→import { generateKey, hkdf, randomBytes, createCipheriv } from 'node:crypto' 2→import { promisify } from 'node:util' 3→ 4→import { JWA, JWKKeyStore } from '@module/gematik-crypto' 5→import type { PrivateEncryptionKey, PublicEncryptionKey } from '@module/gematik-crypto' 6→ 7→import { ensureByteLength } from './ensureByteLength' 8→ 9→/* 10→Encryption functionality as required in section 7.2.3 of 11→https://fachportal.gematik.de/fachportal-import/fi …(truncated, 3994 more chars)

Tools used:

• Bash: find /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau -name "index.ts" -o -name "main.ts" -o -name "package.json"

Tool results:

→ result (ok)

Tools used:

• Bash: ls -la /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/

Tool results:

→ result (ok): drwxr-xr-x clertonra staff 160 B Wed Sep 10 15:13:20 2025 . drwxr-xr-x clertonra staff 1.4 KB Tue Feb 3 14:01:55 2026 .. drwxr-xr-x clertonra staff 160 B Wed Sep 17 17:06:04 2025 constants .rw-r--r-- clertonra staff 1.2 KB Wed Sep 10 15:13:20 2025 README.md drwxr-xr-x clertonra staff 352 B Mon Nov 3 11:23:01 2025 services

Perfect! Now I have a comprehensive understanding. Let me create a final summary document:

VAU Service Implementation - Complete Analysis

Based on my thorough investigation of the codebase, here's everything you need to know about the VAU Service:

1. Location in Codebase

The VAU Service is located in:

/Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/

Module Structure: - /constants/ - Type definitions and constants - /constants/types.ts - Interface definitions - /constants/constants.ts - Error messages and constants - /services/ - Core implementation - vauService.ts - Main service class (primary entry point) - vauClient.ts - HTTP client for VAU API calls - vauValidation.ts - Certificate validation logic - vauUtils.ts - Decryption and parsing utilities - encryption.ts - Request encryption functionality - ensureByteLength.ts - Utility for byte padding - Additional utilities for testing

2. What Does VAU Service Do?

The VAU (Vertrauenswürdige Ausführungsumgebung / Trusted Execution Environment) Service provides secure communication with German healthcare TI (Telematik Infrastruktur) infrastructure. According to the README:

"The VAU is a secure communication channel used to communicate with TI infrastructure, after authentication with the TI Identity Provider (IDP) service."

Key Functions:

1. Certificate Management (vauService.ts lines 17-36): - Fetches VAU encryption certificate - Validates certificate authenticity - Returns public encryption key for request encryption

2. Request Encryption & Posting (vauService.ts lines 38-59): - Encrypts outgoing requests using EC key agreement - Generates random request IDs - Posts encrypted requests to VAU endpoint - Maintains user pseudonym across requests

3. Response Decryption (via vauUtils.ts): - Decrypts VAU responses using AES-GCM - Parses HTTP response from decrypted data - Validates response request ID matches request

Team Owner: FIRE

3. OCSP Removal Changes (FHIR-1818)

Recent Commit: 73e46267f - "fix(fhir-1818): Deprecate VAU OCSP verification" - Date: September 30, 2025 - Author: Sergei Avanesov - PR: #6275

What Changed:

According to the Gematik API documentation, the OCSP (Online Certificate Status Protocol) check for VAU certificate verification is now deprecated. The recommendation is to use only TI Connector for certificate verification.

Code Changes in vauService.ts (lines 23-31):

// BEFORE:
const ocspResponse = await VauClient.fetchOCSPResponse(headerValues)
await VauValidation.verifyCertificate(configurationService, encCertificateResponse)
await VauValidation.verifyCertificateRevocationStatus(configurationService, encCertificateResponse, ocspResponse)

// AFTER:
// https://doctolib.atlassian.net/browse/FHIR-1818
// https://github.com/gematik/api-erp/blob/master/docs/authentisieren.adoc#verbindungsaufbau-zum-e-rezept-fachdienst
// The call to /VAUCertificateOCSPResponse is deprecated, it is recommended to check VAU certificate
// using TI Connector instead
// Commenting the OCSP check now and it will be elaborated in the next ticket.
// const ocspResponse = await VauClient.fetchOCSPResponse(headerValues)

await VauValidation.verifyCertificate(configurationService, encCertificateResponse)
// await VauValidation.verifyCertificateRevocationStatus(configurationService, encCertificateResponse, ocspResponse)

Why This Was Necessary: - The TITUS (test environment) no longer provides OCSP responses (responds with 404) - Without this change, the eRezept flow would fail - The graceful handling will be elaborated in a future ticket - Currently, only the TI Connector validates certificates

4. Main Entry Points & Key Files

Primary Entry Point: - /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauService.ts - Exports: VauService class (singleton instance exported as default) - Main public methods: - fetchValidEncryptionKey() - Get VAU certificate - prepareAndExecutePostRequest() - Send encrypted request and get response

HTTP Client Layer: - /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauClient.ts - VauClient.fetchEncryptionCertificate() - GET /VAUCertificate - VauClient.fetchOCSPResponse() - GET /VAUCertificateOCSPResponse (deprecated, commented out) - VauClient.post() - POST encrypted request to /VAU/{userPseudonym}

Validation Layer: - /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauValidation.ts - VauValidation.verifyCertificate() - Uses TI Connector via CertificateService - VauValidation.verifyCertificateRevocationStatus() - Currently disabled - Verified OCSP signature and certificate revocation status

Encryption/Decryption Utilities: - /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/encryption.ts - Implements ECIES with HKDF key derivation (per gemSpec_Krypt_V2.19.0) - encryptRequest() - Encrypts VAU requests with Brainpool P-256 curve

• /Users/USER/workspace/doctolib/doctolib-pro-desktop/src/modules/gematik-idp-vau/services/vauUtils.ts
• decryptVAUResponse() - AES-GCM decryption
• parseVAUResponse() - Parses HTTP response from encrypted message
• decryptAndParseVAUResponse() - Combined operation

5. Error Constants (constants.ts)

VAU_API_ERROR - Generic VAU API errors
VAU_FETCH_CERTIFICATE_ERROR - Certificate fetch failures
VAU_OCSP_REQUEST_ERROR - OCSP response fetch failures (now unused)
VAU_ENCRYPTION_CERTIFICATE_INVALID_ERROR - Certificate validation failures
EMPTY_RESPONSE_BYTES_ERROR - OCSP response parsing failures (now unused)
ENCRYPTION_CERTIFICATE_REVOCATION_ERROR - Certificate revocation detection (now unused)

6. Testing

Test files are located in __tests_electron__/ directory with comprehensive test suites for all major components. Run tests with:

npm run test:unit -- --project gematik-idp-vau
npm run test:coverage -- --project gematik-idp-vau
npm run test:unit:electron -- --project gematik-idp-vau --coverage

The test file vauService.test.ts was also updated in PR #6275 to remove OCSP response mocking.

This is the complete VAU Service implementation. The key recent change is the deprecation of OCSP verification in favor of TI Connector-based certificate validation, which is a compliance change to align with updated Gematik specifications.