EC P-256 signature SHA-256 DER-encoding (signature only)

Important note: this program is doing what it promises but the programming itself is of very poor quality and for demonstration purposes only. Never ever use this program as source for your own programs because there are a lot of conversions to get it run.

Get more information about this program on my webpage Elliptic key string signature (ECDSA) with DER encoding

Insert your own Private Key (in PEM encoding):

Enter a message to sign:

Instructions:
1.: insert your own private and press the "Import key" button
2.: if the private key is valid the "Sign" button is enabled
3.: enter the message to sign
4.: press the "Sign" button
5.: receive the signature in Base64 encoding

signature (will be in DER format and in Base64 encoding):

Technical note: this program uses the ECDSA Elliptic curve signature algorithm and curve SECP256R1 / NIST P-256 / PRIME256V1 / O.I.D. identifier 1.2.840.10045.3.1.7, the signature is encoded in DER format.