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ECDSA has two variants: deterministic (PSA_ALG_DETERMINISTIC_ECDSA) and randomized (PSA_ALG_ECDSA). The two variants are different for signature but identical for verification. Mbed TLS accepts either variant as the algorithm parameter for verification even when only the other variant is supported, so we need to handle this as a special case when generating not-supported test cases. In this commit: * Automatically generated not-supported test cases for ECDSA now require both variants to be disabled. * Add manually written not-supported test cases for the signature operation when exactly one variant is supported. * Add manually written positive test cases for the verification operation when exactly one variant is supported. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>