This uses the same test data as ecdsa-prime256v1-sha512.pem, HOWEVER the algorithm OID for the public key has been changed from id-ecPublicKey (1.2.840.10045.2.1) to id-ecDH (1.3.132.1.12) This test should fail because the public key's algorithm does not match that of the signature algorithm. -----BEGIN PUBLIC KEY----- MFcwEQYFK4EEAQwGCCqGSM49AwEHA0IABJywz2kwPa/HYdTkaHtOzwOebTSrlkr4CBDY1VikqNb 3LVEjOheIkgqG7gihlix576MX+3h54pfa0hRtuZX6HHg= -----END PUBLIC KEY----- $ openssl asn1parse -i < [PUBLIC KEY] 0:d=0 hl=2 l= 87 cons: SEQUENCE 2:d=1 hl=2 l= 17 cons: SEQUENCE 4:d=2 hl=2 l= 5 prim: OBJECT :1.3.132.1.12 11:d=2 hl=2 l= 8 prim: OBJECT :prime256v1 21:d=1 hl=2 l= 66 prim: BIT STRING -----BEGIN ALGORITHM----- MAoGCCqGSM49BAME -----END ALGORITHM----- $ openssl asn1parse -i < [ALGORITHM] 0:d=0 hl=2 l= 10 cons: SEQUENCE 2:d=1 hl=2 l= 8 prim: OBJECT :ecdsa-with-SHA512 -----BEGIN DATA----- bikyFTMBpO72gOZCiSmtrpiMEI1mijH/VdBImUfXX/gaRr+J6E1kAfAjvm6HaI+814TXhcqEZzV SSstS0ARSyEBApHnnzDMJNkQdk7vnIqlDKm4dsRK1yUA7ECcssTR/1hnUY/ep0iOtdv3gbYpog1 APuEMjWr/5jiQb37VTjD4= -----END DATA----- -----BEGIN SIGNATURE----- A0cAMEQCIEufkeQoUocmGh0ckjz2Gc1SwXXP5/G+YKUljGEDSLo9AiAoxF+QHXHEGymGOOwNaoX X/LDDO7/sWpyBCEa2OSiahA== -----END SIGNATURE----- $ openssl asn1parse -i < [SIGNATURE] 0:d=0 hl=2 l= 71 prim: BIT STRING