The checking for Signature Algorithm Fields is missed for DeviceCert / AliasCert certificate models.

[Zhiqiang520]

The checking for Signature Algorithm Fields is missed for DeviceCert / AliasCert certificate models.

1. For DeviceCert / AliasCert certificate models, Signature Algorithm Fields is Mandatory.
   Refer to the paragraph 397 Table 42 — Field requirements In DSP0274_1.3.0.pdf.
   

2. But there is no checking for Signature Algorithm Fields in function libspdm_x509_common_certificate_check( ) when certificate model is DeviceCert or AliasCert.
   I think /* 3. Verify public key algorithm. */ at the following line 1083 is not the checking for Signature Algorithm Fields.
   

   libspdm/library/spdm_crypt_lib/libspdm_crypt_cert.c

   Lines 1041 to 1095 in 828ef62

   	bool libspdm_x509_common_certificate_check(const uint8_t *cert, size_t cert_size,
   	uint32_t base_asym_algo, uint32_t base_hash_algo,
   	bool is_requester_cert, uint8_t cert_model)
   	{
   	uint8_t end_cert_from[64];
   	size_t end_cert_from_len;
   	uint8_t end_cert_to[64];
   	size_t end_cert_to_len;
   	size_t asn1_buffer_len;
   	bool status;
   	size_t cert_version;
   	size_t value;
   	void *context;
   	if (cert == NULL || cert_size == 0) {
   	return false;
   	}
   	status = true;
   	context = NULL;
   	end_cert_from_len = 64;
   	end_cert_to_len = 64;
   	/* 1. version*/
   	cert_version = 0;
   	status = libspdm_x509_get_version(cert, cert_size, &cert_version);
   	if (!status) {
   	goto cleanup;
   	}
   	if (cert_version != 2) {
   	status = false;
   	goto cleanup;
   	}
   	/* 2. serial_number*/
   	asn1_buffer_len = 0;
   	status = libspdm_x509_get_serial_number(cert, cert_size, NULL, &asn1_buffer_len);
   	if (asn1_buffer_len == 0) {
   	status = false;
   	goto cleanup;
   	}
   	/* 3. Verify public key algorithm. */
   	status = libspdm_verify_cert_subject_public_key_info(cert, cert_size, base_asym_algo);
   	if (!status) {
   	goto cleanup;
   	}
   	/* 4. issuer_name*/
   	asn1_buffer_len = 0;
   	status = libspdm_x509_get_issuer_name(cert, cert_size, NULL, &asn1_buffer_len);
   	if (asn1_buffer_len == 0) {
   	status = false;
   	goto cleanup;
   	}

3. I think maybe libspdm_x509_common_certificate_check() should call libspdm_x509_get_signature_algorithm() to get Signature Algorithm.