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The current specification describes the JWA alg "RSA-OAEP", which is RSA-OAEP with SHA-1 and MGF-1 SHA-1. However, additional algorithms are supported in WebCrypto - namely, SHA-256, SHA-384, and SHA-512 - and their representation in JWK is not described (as noted in Appendix A) JOSE has decided that the naming format will be "RSA-OAEP-256" for RSA-OAEP with SHA-256 and MGF-1 SHA-256 in the most recent drafts. The specification for Import Key and Export Key for RSA-OAEP should be updated to reflect the table-based nature of the hash algorithm. Currently, Step 5 of Import for JWK states "if the alg field of jwk is present, and is not RSA-OAEP, return an error named DataError"
https://dvcs.w3.org/hg/webcrypto-api/rev/a4cb70fcc0bb