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Agent skill
configuring-hsm-for-key-storage
Hardware Security Modules (HSMs) are tamper-resistant physical devices that safeguard cryptographic keys and perform cryptographic operations in a hardened environment. Keys stored in an HSM never lea
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SKILL.md
Configuring HSM for Key Storage
Overview
Hardware Security Modules (HSMs) are tamper-resistant physical devices that safeguard cryptographic keys and perform cryptographic operations in a hardened environment. Keys stored in an HSM never leave the device boundary, providing the highest level of key protection. This skill covers configuring HSMs using the PKCS#11 standard interface, including key generation, signing, encryption, and key management using both physical HSMs and SoftHSM2 for development.
Objectives
- Configure SoftHSM2 as a development PKCS#11 provider
- Generate and manage keys inside the HSM via PKCS#11
- Perform cryptographic operations (sign, verify, encrypt, decrypt) using HSM-resident keys
- Implement HSM-backed certificate authority operations
- Configure key access policies and user authentication
- Interface with cloud HSM services (AWS CloudHSM, Azure)
Key Concepts
HSM Compliance Levels
| FIPS Level | Protection | Use Case |
|---|---|---|
| FIPS 140-2 Level 1 | Software only | Development |
| FIPS 140-2 Level 2 | Tamper-evident, role-based auth | General production |
| FIPS 140-2 Level 3 | Tamper-resistant, identity-based auth | Financial, government |
| FIPS 140-2 Level 4 | Physical tamper response | Military, classified |
PKCS#11 Architecture
Application --> PKCS#11 API --> HSM Provider --> Hardware HSM
|
(SoftHSM2 for dev)
Key Objects in PKCS#11
| Object Type | Description | Operations |
|---|---|---|
| CKO_SECRET_KEY | Symmetric keys (AES) | Encrypt, Decrypt, Wrap |
| CKO_PUBLIC_KEY | Public keys (RSA, EC) | Verify, Encrypt, Wrap |
| CKO_PRIVATE_KEY | Private keys (RSA, EC) | Sign, Decrypt, Unwrap |
| CKO_CERTIFICATE | X.509 certificates | Storage, retrieval |
Security Considerations
- Never export private keys from HSM (use CKA_EXTRACTABLE=False)
- Use separate slots/partitions for different applications
- Implement multi-person key ceremony for CA root keys
- Enable audit logging for all HSM operations
- Implement HSM backup and disaster recovery
- Use strong PINs and enable SO (Security Officer) PIN
Validation Criteria
- SoftHSM2 initializes with token and user PIN
- AES key generates inside HSM
- RSA key pair generates inside HSM
- Encryption/decryption uses HSM-resident keys
- Signing/verification uses HSM-resident keys
- Keys cannot be exported (non-extractable)
- Key listing shows all HSM-stored objects
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