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The key, message, and signature come from wycheproof ecdsa_secp256r1_sha256_test.json
The signature was wrapped in an additional BITSTRING.
$ 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 PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEBKrsc2NXJvIT+4qeZNo7hjLkFJWpRNAEW1IuunJ
A+tWH2TFXmKqjpboBd1eHztBeqve04J/IHW0apUboNl1SXQ==
-----END PUBLIC KEY-----
$ openssl asn1parse -i < [ALGORITHM]
0:d=0 hl=2 l= 10 cons: SEQUENCE
2:d=1 hl=2 l= 8 prim: OBJECT :ecdsa-with-SHA256
-----BEGIN ALGORITHM-----
MAoGCCqGSM49BAMC
-----END ALGORITHM-----
-----BEGIN DATA-----
MTIzNDAw
-----END DATA-----
$ openssl asn1parse -i < [SIGNATURE]
0:d=0 hl=2 l= 73 prim: BIT STRING
-----BEGIN SIGNATURE-----
A0kAMEYCIQCo6hUMuAEl1zgcTB8dqOneJxH5kXBgQGpz15BFGeUTiAIhAPOrn6aL1HlzpzstQEg
MK6UMIsnXbsIXJXKIKTKFRJuG
-----END SIGNATURE-----
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