ECDSA sample

generating EC keypair, signing and verifying ECDSA signature

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(Step1) choose supported EC curve name and generate key pair

ECC curve name:

EC private key (hex):
EC public key (hex):

(Step2) Sign message

Signature Algorithm:
Message string to be signed:

Signature value (hex):

(Step3) Verify signature

NOTE: To use key pairs generated by OpenSSL

When you want to use a key pair which generated by OpenSSL, please follow the instructions: 
# generate secp256r1 curve EC key pair
# Note: openssl uses the X9.62 name prime256v1 to refer to curve secp256r1, so this will generate output
% openssl ecparam -genkey -name secp256r1 -out k.pem

# print private key and public key
% openssl ec -in k.pem -noout -text

Private-Key: (256 bit)
priv:
    11:b5:73:7c:f9:d9:3f:17:c0:cb:1a:84:65:5d:39:
    95:a0:28:24:09:7e:ff:a5:ed:d8:ee:26:38:1e:b5:
    d6:c3
pub:
    04:a0:15:32:a3:c0:90:00:53:de:60:fb:ef:ef:cc:
    a5:87:93:30:15:98:d3:08:b4:1e:6f:4e:36:4e:38:
    8c:27:11:be:f4:32:c5:99:14:8c:94:14:3d:4f:f4:
    6c:2c:b7:3e:3e:6a:41:d7:ee:f2:3c:04:7e:a1:1e:
    60:66:7d:e4:25
ASN1 OID: prime256v1
Please delete colons ':' and new lines for the private key and the public key and fill "EC private key (hex)" and "EC public key (hex)" in above form and choose proper curve name, then you can use them for signing and verification.