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Andy Green af26f0c765 lejp: correct return temp type to int 
lejp_parse() return type is an int... but in the function, the temp
for it is a char.  This leads to badness that is currently worked
around by casting the return through a signed char type.

But that leads to more badness since if there's >127 bytes of buffer
left after the end of the JSON object, we misreport it.

Bite the bullet and fix the temp type, and fix up all the guys
who were working around it at the caller return casting to use the
resulting straight int.

If you are using this api, remove any casting you may have cut-
and-pasted like this

n = (int)(signed char)lejp_parse(...);

... to just be like this...

n = lejp_parse(...);
2020-05-11 15:17:14 +01:00
..
jwe lejp: correct return temp type to int 2020-05-11 15:17:14 +01:00
jwk lejp: correct return temp type to int 2020-05-11 15:17:14 +01:00
jws lejp: correct return temp type to int 2020-05-11 15:17:14 +01:00
private-lib-jose.h private.h: rename to contain dir 2019-08-15 10:49:52 +01:00
README.md jwe 2018-12-27 06:45:32 +08:00

README.md

JOSE support

JOSE is a set of web standards aimed at encapsulating crypto operations flexibly inside JSON objects.

Lws provides lightweight apis to performs operations on JWK, JWS and JWE independent of the tls backend in use. The JSON parsing is handled by the lws lejp stream parser.

Part RFC Function
JWS RFC7515 JSON Web Signatures
JWE RFC7516 JSON Web Encryption
JWK RFC7517 JSON Web Keys
JWA RFC7518 JSON Web Algorithms

JWA is a set of recommendations for which combinations of algorithms are deemed desirable and secure, which implies what must be done for useful implementations of JWS, JWE and JWK.

Supported algorithms

Supported keys

  • All RFC7517 / JWK forms: octet, RSA and EC

  • singleton and keys[] arrays of keys supported

Symmetric ciphers

  • All common AES varaiants: CBC, CFB128, CFB8, CTR, EVB, OFB, KW and XTS

Asymmetric ciphers

  • RSA

  • EC (P-256, P-384 and P-521 JWA curves)

Payload auth and crypt

  • AES_128_CBC_HMAC_SHA_256
  • AES_192_CBC_HMAC_SHA_384
  • AES_256_CBC_HMAC_SHA_512
  • AES_128_GCM

For the required and recommended asymmetric algorithms, support currently looks like this

JWK kty JWA lws
EC Recommended+ yes
RSA Required yes
oct Required yes
JWE alg JWA lws
RSA1_5 Recommended- yes
RSA-OAEP Recommended+ no
ECDH-ES Recommended+ no
JWS alg JWA lws
HS256 Required yes
RS256 Recommended+ yes
ES256 Recommended yes

Minimal Example tools

JWK

JWS

JWE

API tests

See ./minimal-examples/api-tests/api-test-jose/ for example test code. The tests are built and confirmed during CI.