These JWTs that AM receives can be signed and/or encrypted. Sometimes, larger JWTs are compressed to improve delivery speeds to AM.
Decompressing a JWT makes it expand in size. By default, AM rejects any JWT that expands to more than 32 KiB (32768 bytes), and throws an exception with a message similar to JWT payload decompressed to larger than maximum allowed size.
Ensure that the JWTs your clients send to AM are smaller than 32 KiB before compression, or increase the 32 KiB value to a reasonable limit. Take into account that AM performs decryption and decompression operations in its heap, and that you do not want to allow very large JWTs to, potentially, leave AM out of memory.
If you need to change the default value, perform the following steps:
Configure the org.forgerock.json.jose.jwe.compression.max.decompressed.size.bytes Java system property on the container where AM runs.
For example, edit the setenv.sh file of the Apache Tomcat instance, and set the property with the new size in bytes:
While there is no limit to the size of a JWT, in general the larger they are, the more CPU is required to sign and verify them and the more time it takes to transport them. Benchmark expected JWTs to have an understanding of the performance characteristics.
The maximum allowed value of MaxTokenSize is 65535 bytes. However, because of HTTP's base64 encoding of authentication context tokens, we do not recommend that you set the maxTokenSize registry entry to a value larger than 48000 bytes.
A key of the same size as the hash output (for instance, 256 bits for “HS256”) or larger MUST be used with this algorithm. The minimum key length for RSA: A key of size 2048 bits or larger MUST be used with these algorithms.
The option with the best security and performance is EdDSA, though ES256 (The Elliptic Curve Digital Signature Algorithm (ECDSA) using P-256 and SHA-256) is also a good choice. The most widely used option, supported by most technology stacks, is RS256 (RSASSA-PKCS1-v1_5 using SHA-256).
However, you can't control all API use; API keys are likely to leak; HTTPS is not always possible; and so on. With JWT, because the token is hashed / encrypted, it comes with a more secure methodology that is less likely to be exposed.
The maximum allowed size for an ID or access Token is around 3.5kb. However, this limit applies when the ID or Access Token is returned on the callback URL. Some browsers don't support longer URLs; having this limit helps avoid unexpected browser-specific issues.
It is Base64Url encoded to form the first part of the JWT. The payload contains the claims. There is a set of registered claims, for example, iss (issuer), exp (expiration time), sub (subject), and aud (audience).
The most popular sized tokens are 0.900” and 0.984”. A 0.900” is slightly SMALLER than a US quarter and a 0.984” is slightly LARGER than a quarter. Use our coin size chart to help make a decision on what size token is needed for your application or coin operated machine.
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