Sign file by using private key

[Manojacadia]

Hi All,

My requirement is to sign file with Private key before sending it to client through Mirth channel

[pacmano1]

Not enough information.

1. Is the requirement for a digital signature (e.g., using PKI) or another form of signing?
2. Should the signature comply with a specific standard, such as XML Signature, JSON Web Signature (JWS), or PKCS#7?
3. What type of private key is being used (e.g., RSA, ECDSA)?
4. What is the key length (e.g., 2048-bit, 4096-bit)?
5. Where is the private key stored?
6. Is the private key password-protected? If so, how will the password be provided securely?
7. Which hashing algorithm is required for signing (e.g., SHA-256, SHA-512)?
8. What type of file is being signed (e.g., XML, JSON, binary, text)?
9. Does the file format require specific handling during signing (e.g., canonicalization for XML)?
10. How should the signed file or signature be provided?
11. Detached signature (separate from the file)?
12. Attached signature (embedded in the file)?
13. Is the signature expected in a specific encoding (e.g., Base64, binary)?
14. Are there preferences for using a specific library or tool for signing (e.g., Bouncy Castle, OpenSSL, Java Security)?
15. Are there any compliance or regulatory standards that the signing process must adhere to (e.g., HIPAA, GDPR, FIPS)?
16. How will private keys be rotated or updated?
17. Is there a need to verify the signing process for auditing purposes?
18. What are the client’s requirements or expectations for verifying the signature?
19. Do they require a specific certificate chain or trust anchor?