a798692e4e
[ Partial merge of http://go/wvgerrit/188279 ] This CL adds unit tests to verify that the following forbidden uses of an RSA private key do not work: - ForbidPrepAndSign -- A cast cert key cannot sign a license request. - ForbidUseAsDRMCert -- A cast cert cannot be used with the DRM cert's padding scheme and it cannot be used to derive keys from a session key. - *ForbidRSASignatureForDRMKey* -- A DRM cert key cannot be used with GenerateRSASignature. - *OEMCertForbidGenerateRSASignature* -- An OEM cert key cannot be used with GenerateRSASignature. Bug: 251875110 Test: WVTS Change-Id: I55b1eb04465023352edea55ba4ef532d1cd07231