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Please refer to the Secure Image template project to understand how Creator generates the digital signature.
The "cymcuelftool" is used by Creator to sign the elf file with SHA256 to create the hash and encrypts it with RSAASA-PKCS algorithm and generates an output secure hex file. The command used is:
cymcuelftool.exe --sign %elf file% SHA-256 --encrypt %RSAASSA-PKCS% --key %PRIVATE_KEY% --output %output_elf_file% --hex %output_hex_file%
I am not sure what commands you are using to generate the digital signature, so please mention the flow of commands you are using to verify the digital signature and we can help you further.
More on cymcuelftool can be found in the user guide present at this path: "C:\Program Files (x86)\Cypress\PDL\3.x.x\doc"