Bug 260430

This bug affects the recently added algorithm Ed25519, but also other algorithms. In the case of the former one, according to the Secure Curves spec [1], if the kty field is not present or incorrect, we should throw a DataError exception.

> If the kty field of jwk is not "OKP", then throw a DataError. 

On the other hand, the Web Cryptography specification states something similar for other algorithms:

* In case of the RSA-* [2][3][4] algorithms:

> If the "kty" field of jwk is not a case-sensitive string match to "RSA", then throw a DataError. 

* In case of the EC* [5][6] algorithms:

> If the "kty" field of jwk is not "EC", then throw a DataError. 

* In case of the AES-* [7][8][9][10] algorithms:

> If the "kty" field of jwk is not "oct", then throw a DataError. 

* In case of the HMAC [11] algorithm:

> If the "kty" field of jwk is not "oct", then throw a DataError. 


[1] https://wicg.github.io/webcrypto-secure-curves/#ed25519-operations  
[2] https://www.w3.org/TR/WebCryptoAPI/#rsassa-pkcs1-operations
[3] https://www.w3.org/TR/WebCryptoAPI/#rsa-pss-operations
[4] https://www.w3.org/TR/WebCryptoAPI/#rsa-oaep-operations
[5] https://www.w3.org/TR/WebCryptoAPI/#ecdsa-operations
[6] https://www.w3.org/TR/WebCryptoAPI/#ecdh-operations
[7] https://www.w3.org/TR/WebCryptoAPI/#aes-ctr-operations
[8] https://www.w3.org/TR/WebCryptoAPI/#aes-cbc-operations
[9] https://www.w3.org/TR/WebCryptoAPI/#aes-gcm-operations
[10] https://www.w3.org/TR/WebCryptoAPI/#aes-kw-operations
[11] https://www.w3.org/TR/WebCryptoAPI/#hmac-operations