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How the three signing methods differ
| Method | Key model | What verification means | Implementation point |
|---|---|---|---|
| HMAC-SHA256 | Sender and receiver share a secret. | Any party with the secret can verify a message and create a valid MAC. It does not separate verification authority from signing authority. | Secret distribution, constant-time comparison, exact input bytes, and any replay controls are central. |
| RSA | Sender signs with a private key; receiver verifies with the corresponding public key. | A verifier can keep only the public key, separate from signing authority. | “RSA” is incomplete by itself: the padding and digest profile, key format, and signature encoding must match the provider’s protocol. |
| Ed25519 | Sender signs with a private key; receiver verifies with the corresponding public key. | A verifier can keep only the public key, separate from signing authority. | Use the provider’s defined key serialization, signature encoding, and signed-input construction. |
HMAC-SHA256: shared-secret authentication
HMAC-SHA256 computes a message authentication code using a shared secret and SHA-256. Because both sender and verifier possess that secret, every verifier that can validate messages could also produce a valid one. That makes secret access a trust-boundary decision: keep the secret only in components that need to validate or originate messages.
GitHub documents webhook digests as keyed with the webhook secret and derived from the payload contents. Its current recommended header is X-Hub-Signature-256, with a hexadecimal digest prefixed by sha256=; the HMAC-SHA1 header is legacy. See GitHub’s webhook validation documentation.
RSA: asymmetric signing with a required profile
With RSA, the provider keeps the private signing key and distributes the corresponding public key to verifiers. A receiver that has only the public key can check signatures without gaining the ability to sign new messages. For HTTP signatures, RFC 9421 specifies an RSA PKCS#1 v1.5 profile using SHA-256. The label “RSA” alone does not tell you whether the protocol uses that profile or another one.
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For the RSASSA-PKCS1-v1_5 SHA-2 JWS algorithms defined in RFC 7518, the RSA key must be at least 2048 bits. This is a requirement for those specified algorithms, not a comparative security score for webhook deployments. See RFC 7518 and RFC 9421.
Ed25519: asymmetric signatures with a defined output
Ed25519 also separates signing and verification keys. RFC 9421 applies Ed25519 to the signature base without a prehash function and specifies a 64-octet signature output. These are properties of the protocol profile, not evidence that Ed25519 is always faster or more secure in every deployment. Svix and Standard Webhooks document Ed25519 for webhook signing; their exact message construction and encodings remain part of their respective protocols. See RFC 9421, Svix’s verification guide, and the Standard Webhooks specification.
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What must match for verification to work
A signature algorithm is only one part of the scheme. A valid verification implementation must reproduce the provider’s exact signed input and interpret its headers and keys exactly as specified.
- Original bytes: Read and retain the raw request body bytes. Do not parse JSON and serialize it again before verification; whitespace, escaping, or key ordering can change the bytes and invalidate a signature.
- All signed components: Some protocols sign only payload contents. Others include metadata such as a message ID and timestamp. Standard Webhooks signs the ID, timestamp, and body together, so omitting or altering any component changes the signature base.
- Exact profile and encoding: Match the named hash and padding for RSA, the provider’s HMAC or Ed25519 variant, key serialization, signature encoding, header names, and any version prefix. For example, Standard Webhooks distinguishes
v1HMAC fromv1aEd25519. - Provider’s key lifecycle: Follow its documented key provisioning and rotation process. A cryptographically correct check against an outdated or incorrectly serialized key will still fail.
The Standard Webhooks specification warns that even a stray space can invalidate a signature. Its signed-content rules and encoding details are in the specification.
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How to verify webhook signatures safely
- Use the provider’s current contract. Identify the documented signature header, algorithm profile, key format, signed fields, signature encoding, and rotation procedure. Do not infer these from a generic label such as “RSA.”
- Capture the request body before transformation. Preserve the original bytes at the point where the request enters your application. If your framework consumes or rewrites the body, configure access to its raw-body buffer before parsing.
- Recreate the provider-defined input. Combine the raw body with any required metadata in exactly the prescribed format. Include a timestamp or message ID only when the protocol specifies it, and preserve the exact representation and ordering required.
- Compute or verify with the specified key and profile. For HMAC, calculate the MAC using the configured shared secret. For RSA or Ed25519, verify with the correct public key and exact profile. Decode prefixes or encodings only as the provider directs.
- Compare safely and enforce freshness when applicable. Compare HMAC values using a constant-time comparison rather than ordinary string equality. If the scheme signs a timestamp, check that it falls within the provider’s permitted freshness window; signing and checking it helps limit replay of old deliveries.
- Only then process the event. Treat the webhook as untrusted until verification succeeds. Keep failure handling aligned with the provider’s delivery and retry behavior.
GitHub explicitly warns, “Never use a plain == operator” when comparing the signature. Its validation guidance also describes the sha256= hexadecimal format and the X-Hub-Signature-256 header: GitHub Docs. For timestamp freshness, consult the provider’s specific policy; Svix advises checking recency to reduce replay risk in its verification guide.
Which option should you use?
For a consumer of an existing webhook, use the provider’s specified scheme rather than choosing an algorithm independently. For a system you control, the trust model is the clearest starting point: HMAC means every verifier must receive a secret that can also sign; RSA or Ed25519 allow verification with public keys while keeping signing authority private. Then select a complete protocol profile and define the signed fields, serialization, headers, timestamp and replay policy, key distribution, and rotation behavior.
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The cited standards and provider documents define mechanics, not a cross-provider performance test. They do not establish a universal speed, security, or adoption ranking for HMAC-SHA256, RSA, and Ed25519. Compare the exact profiles and libraries in the environment where they will run, and validate interoperability against the provider’s current documentation.
Quick Recap
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