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Introduce helper functions to support signature verification required by DIAG 508 subcode 1: qcrypto_pkcs7_convert_sig_pem() – converts a signature from DER to PEM format qcrypto_x509_verify_sig() – verifies the provided data against the given signature These functions enable basic signature verification support. Signed-off-by: Zhuoying Cai <zycai@linux.ibm.com> Acked-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Farhan Ali <alifm@linux.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Link: https://lore.kernel.org/qemu-devel/20260730214624.2328883-13-zycai@linux.ibm.com Signed-off-by: Eric Farman <farman@linux.ibm.com>