PKI_pkcs11SignatureTombedTLSSignature

Converts and ECDSA P-256 signature from the format provided by PKCS #11 to an ASN.1 formatted signature.

BaseType_t PKI_pkcs11SignatureTombedTLSSignature( uint8_t * pucSig,
                                                  size_t * pxSigLen );

For P-256 signature, ASN.1 formatting has the format

SEQUENCE LENGTH INTEGER LENGTH R-VALUE INTEGER LENGTH S-VALUE

Parameters

[in,out]	pucSig	This pointer serves dual purpose. It should both contain the 64-byte PKCS #11 style signature on input, and will be modified to hold the ASN.1 formatted signature (max length 72 bytes). It is the responsibility of the caller to guarantee that this pointer is large enough to hold the (longer) formatted signature.
[out]	pxSigLen	Pointer to the length of the ASN.1 formatted signature.

Returns

0 if successful, -1 on failure.