RSA verify

POST /api/rsa-verify2 quota units per call · cache hits free

Verify an RSA signature against a SPKI PEM public key. Supports PSS and PKCS1-v1_5 schemes plus SHA-256/384/512. Returns whether the signature is valid.

Verifies that a `signature` matches `data` under the given RSA public key (SPKI PEM). Returns `{valid: true|false}` plus the echoed scheme + hash. Use `pss` for RSA-PSS signatures and `pkcs1` for the legacy RSASSA-PKCS1-v1_5 scheme (JWT RS256/384/512, SAML, …).

Inputs

Name	Type	Default	Description
data*	string	—	Original message that was signed.
dataFormat	enum (text \| hex \| base64)	"text"	Encoding of `data`.
signature*	string	—	Signature to verify.
signatureFormat	enum (hex \| base64 \| base64url)	"base64"	Encoding of `signature`.
publicKeyPem*	string	—	Public key in SPKI PEM format.
scheme	enum (pss \| pkcs1)	"pss"	Signature scheme used at signing time.
hash	enum (SHA-256 \| SHA-384 \| SHA-512)	"SHA-256"	Hash algorithm.
saltLength	number (0…256)	32	PSS salt length used at signing.

Response

Modes: json. Cache: not cacheable.

Every response carries x-cache (HIT / MISS / BYPASS), x-cache-signature (stable across identical inputs), and the rate-limit headers listed below.

Quota & limits

Cost per call	2 units against the 10,000-unit monthly quota. Cache hits are free — only cache misses decrement.
Burst limit	200 requests per rolling minute, shared across all tools.
Max request size	`4 MiB` (base64 inflates file payloads ~33% — the limit applies to the decoded bytes).
Max response size	`8 KiB`
Timeout	30s wall clock.
Rate-limit headers	`X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Burst-Limit` on every response; `X-Quota-Warning` once 80% of the monthly quota is spent; `Retry-After` on 429s.

Errors

Errors are JSON with an error string; schema failures add a details object (Zod's flattened field errors).

Status	When	Body
400	Input fails the tool's schema (wrong type, missing required field, malformed base64) or the file bytes can't be parsed as the expected format.	{ "error": "invalid inputs", "details": { "fieldErrors": { … } } }
401	Missing or invalid X-Api-Key / X-Account-Id headers (or no session when called from the browser).	{ "error": "unauthorized" }
404	Unknown tool id, or calling /api/* on the website hostname instead of api.xtract.bot.	{ "error": "not found" }
413	Request body over the tool's max request size, or an image header declaring more megapixels than the tool's pixel budget.	{ "error": "…exceeds maxRequestBytes…" }
415	Content-Type isn't application/json on the json-body transport.	{ "error": "unsupported content-type; expected application/json" }
429	Monthly quota or the 200/min burst limit exhausted. Check Retry-After and the X-RateLimit-* headers.	{ "error": "monthly quota exceeded", "monthRemaining": 0, … }
5xx	Conversion engine failure. Safe to retry; if it persists, the input is hitting a bug — please report it.	{ "error": "…" }

Code samples

Built from the verify-pkcs1-good example.


curl -X POST https://api.xtract.bot/api/rsa-verify \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "X-Account-Id: $XTRACT_ACCOUNT_ID" \
  -H "X-Api-Key: $XTRACT_API_KEY" \
  -d '{
  "data": "the eagle has landed",
  "signature": "GWa5pAHR7RbC9g9JWmxP4VaBiVkOiylReTwG4nqjo4Vkw6W5kfaRWGGeYWy8YkjYvLTHtgXmlXiMz9kD1JVCaAR90+Li/JZPEIH+bmw+2KvziZ8kD7isgPgRXtiYH4VN122V3hcvlRS8UQ01iaZg3X6Dg1+PLz6j1zOaEto0dKYZ/4YvUkVZATOxZP+Qz98Q4p2WvoMBm17uKxditXuBKGrt5bexALrVijSWgYTVHPCP4+abngegUcMSvJlPCyTgjbxowaMMyy7kVX/PcsJRXKBs2MgRu7j8rMlf8ZbM4po1emqBtZoaol/GooFZNzS2q8YKB/gfvTHz04URrC34Sg==",
  "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjvk6JK5I8uhIG/4qyR5C\n85U5tr3myRyk4ULz/80T/os8yqhW9dooy4Qx+bk0U59Gg2gMleL8qikSUkB8JlkQ\nssAFh19WN9+CWfCvtXQwC0/QYBBKdDfHTLdsX9eJ4ClJWwnxyvr6b49fIf8q9Z9T\n6o/bKkJGcu2jygWmVsvkGfxAAtOLfk74BYAsuFrt1wyn/D4uNOyqrzBwBgrqMxZe\nmjSMGTYkGMN4e6moA/l2kK5yMuUZzlvgo8eGnvq+YwM1vBSy+v+X4sXwRcPE7Mv0\nUOmVQrHdO3iKGLTGUsXS3cbeOjAVHybIWCtkJsvvqDHDf1UBe/prine1XxLNxvPm\nQwIDAQAB\n-----END PUBLIC KEY-----",
  "scheme": "pkcs1"
}'