Fix hex data parsing on invalid JSON strings

cryptosense / pkcs11

OCaml bindings for the PKCS#11 cryptographic API

BSD 2-Clause "Simplified" License

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Closed bbc2 closed 6 years ago

bbc2 commented 6 years ago

This adds test for P11_hex_data.of_yojson and avoids exceptions for the following cases:

Empty strings (Invalid argument: index out of bounds)
Odd number of hex digits (Invalid_argument "hex conversion: invalid hex string")