Azure Blob Storage

Overview#

The Azure Blob Storage connector encrypts blob content with ML-KEM-768 + AES-256-GCM before upload and decrypts on download. Azure AD OAuth2 credentials are sealed in QuantaVault. Azure never receives plaintext data.

Prerequisites#

• 1An Azure Storage Account and container
• 2An Azure AD App Registration with Storage Blob Data Contributor role on the container
• 3Client ID, Client Secret, Tenant ID, and Storage Account name
• 4A QuantaSeal API key

Configuration#

Follow these steps to connect Azure Blob Storage to QuantaSeal. You can configure integrations via the Admin Console or directly via the API.

1. 1

   In Azure Portal, create an App Registration and assign it Storage Blob Data Contributor on your container.

2. 2

   Note the client_id, client_secret, and tenant_id.

3. 3

   Seal credentials: POST /api/v2/vault/seal with credential_type: oauth2_client.

4. 4

   Create the integration: POST /api/v2/integrations with system_type: azure_blob and container details.

Authentication Types#

Use oauth2_client with Azure AD client_credentials flow. Store client_id, client_secret, tenant_id, and storage_account_name as oauth2_client in QuantaVault.

All credential types are sealed in QuantaVault with ML-KEM-768 + AES-256-GCM and wrapped by your tenant AWS KMS CMK before storage. See the Vault API reference for the full list of credential types and seal/unseal endpoints.

Available Operations#

QuantaSeal enforces a default-deny operation policy. Only operations listed in your integration's allowed_operations array will be permitted. Add operations when creating or updating the integration.

Code Example#

Every proxy call returns a HybridCryptoEnvelope - the response is ML-KEM-768 key-encapsulated, AES-256-GCM encrypted, and signed with ML-DSA-65 + HMAC-SHA-512. Verify both signatures before trusting the decrypted payload.

curl -X POST https://api.quantaseal.io/api/v2/proxy/outbound \
  -H "X-API-Key: qs_live_your_key_here" \
  -H "Content-Type: application/json" \
  -d '{
    "integration_id": "int_01HZ9X2K4MNPQRAZUREBLOB01",
    "operation": "upload_blob",
    "payload": {
      "container": "secure-uploads",
      "blob_name": "payroll/2026-05.csv",
      "content": "employee_id,salary\n1001,120000",
      "content_type": "text/csv"
    }
  }'

# Response - HybridCryptoEnvelope
{
  "success": true,
  "encrypted": {
    "ciphertext_kem":  "<base64 - 1088 bytes ML-KEM-768>",
    "ciphertext_data": "<base64 - AES-256-GCM encrypted Azure upload result>",
    "nonce":           "<base64 - 12 bytes>",
    "tenant_id":       "ten_01HZ9X2K4MNPQR5STUVWXYZ00",
    "algorithm":       "ML-KEM-768"
  },
  "signature": {
    "pqc_signature":  "<base64 - ~3309 bytes ML-DSA-65>",
    "hmac_signature": "<base64 - 64 bytes HMAC-SHA-512>",
    "tenant_id":      "ten_01HZ9X2K4MNPQR5STUVWXYZ00",
    "algorithm":      "ML-DSA-65+HMAC-SHA-512"
  },
  "audit_event_id": "aud_01HZ9XABCDEF"
}

Troubleshooting#