Generate with ssh
ssh-keygen -t ecdsa -b 256 -m pem
take the base64 encoded string and decode it
http://tomeko.net/online_tools/base64.php?lang=en
Shouldn't use in production!! The git client will do it once I get there
Extract the private key
ASN.1 STRUCTURE FOR PRIVATE KEY: 30 <-- declares the start of an ASN.1 sequence 74 <-- length of following sequence 02 <-- declares the start of an integer 01 <-- length of integer in bytes (1 byte) 01 <-- value of integer (1) 04 <-- declares the start of an "octet string" 20 <-- length of string to follow (32 bytes) 3cd0560f5b27591916c643 ... a738d2e912990dcc573715d2c --------------------------------------------------/ a0 <-- declares the start of context-specific tag 0 07 <-- length of context-specific tag 06 <-- declares the start of an object ID 05 <-- length of object ID to follow 2b 81 04 00 0a <-- the object ID of the curve secp256k1 a1 <-- declares the start of context-specific tag 1 44 <-- declares the length of context-sepcifc tag (68 bytes) 03 <-- declares the start of a bit string 42 <-- length of bit string to follow (66 bytes) 04 f1 44 f0 dc 00 80 af d2 b7 3f 13 37 6c ... 05 49 cd 83 f4 58 56 1e -------------------------------------------------------------------/ taken from https://bitcoin.stackexchange.com/questions/66594/signing-transaction-with-ssl-private-key-to-pem
Tested with metamask :) Work great
to go from PEM to DEC format
openssl ec -outform der -in matic -out private.key