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This is the same as ecdsa-prime256v1-sha512.pem, except the signature is wrong.
Rather than encoding the signature into a DER-encoded Ecdsa-Sig-Value, it is a
concatenation of the r and s values. This is the format that WebCrypto uses for
ECDSA signature, but not what is used for digital signatures.
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEnLDPaTA9r8dh1ORoe07PA55tNKuWSvgIENjVWKS
o1vctUSM6F4iSCobuCKGWLHnvoxf7eHnil9rSFG25lfoceA==
-----END PUBLIC KEY-----
$ openssl asn1parse -i < [PUBLIC KEY]
0:d=0 hl=2 l= 89 cons: SEQUENCE
2:d=1 hl=2 l= 19 cons: SEQUENCE
4:d=2 hl=2 l= 7 prim: OBJECT :id-ecPublicKey
13:d=2 hl=2 l= 8 prim: OBJECT :prime256v1
23: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-----
A0EAS5+R5ChShyYaHRySPPYZzVLBdc/n8b5gpSWMYQNIuj0oxF+QHXHEGymGOOwNaoXX/LDDO7/
sWpyBCEa2OSiahA==
-----END SIGNATURE-----
$ openssl asn1parse -i < [SIGNATURE]
0:d=0 hl=2 l= 65 prim: BIT STRING
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