1、openssl ec:
[vagrant@vm-node1:btc]$ openssl ec -help Usage: ec [options]
General options:
-help Display this summary
-engine val Use engine, possibly a hardware device
Input options:
-in val Input file
-inform format Input format (DER/PEM/P12/ENGINE)
-pubin Expect a public key in input file
-passin val Input file pass phrase source
-check check key consistency
-* Any supported cipher
-param_enc val Specifies the way the ec parameters are encoded
-conv_form val Specifies the point conversion form
Output options:
-out outfile Output file
-outform PEM|DER Output format - DER or PEM
-noout Don't print key out
-text Print the key
-param_out Print the elliptic curve parameters
-pubout Output public key, not private
-no_public exclude public key from private key
-passout val Output file pass phrase source
Provider options:
-provider-path val Provider load path (must be before 'provider' argument if required)
-provider val Provider to load (can be specified multiple times)
-propquery val Property query used when fetching algorithms
2、openssl ecparam:
[vagrant@vm-node1:btc]$ openssl ecparam -help
Usage: ecparam [options]
General options:
-help Display this summary
-list_curves Prints a list of all curve 'short names'
-engine val Use engine, possibly a hardware device
-genkey Generate ec key
-in infile Input file - default stdin
-inform PEM|DER Input format - default PEM (DER or PEM)
-out outfile Output file - default stdout
-outform PEM|DER Output format - default PEM
Output options:
-text Print the ec parameters in text form
-noout Do not print the ec parameter
-param_enc val Specifies the way the ec parameters are encoded
Parameter options:
-check Validate the ec parameters
-check_named Check that named EC curve parameters have not been modified
-no_seed If 'explicit' parameters are chosen do not use the seed
-name val Use the ec parameters with specified 'short name'
-conv_form val Specifies the point conversion form
Random state options:
-rand val Load the given file(s) into the random number generator
-writerand outfile Write random data to the specified file
Provider options:
-provider-path val Provider load path (must be before 'provider' argument if required)
-provider val Provider to load (can be specified multiple times)
-propquery val Property query used when fetching algorithms
3、使用示例：
#!/bin/sh
PRIVATE_KEY="ECDSA"
PUBLIC_KEY="ECDSA.pub"
BITCOIN_PRIVATE_KEY="bitcoin"
BITCOIN_PUBLIC_KEY="bitcoin.pub"
echo "Generating private key"
openssl ecparam -genkey -name secp256k1 -rand /dev/random -out $PRIVATE_KEY
echo "Generating public key"
openssl ec -in $PRIVATE_KEY -pubout -out $PUBLIC_KEY
echo "Generating Bitcoin private key"
openssl ec -in $PRIVATE_KEY -outform DER|tail -c +8|head -c 32|xxd -p -c 32 > $BITCOIN_PRIVATE_KEY
echo "Generating Bitcoin public key"
openssl ec -in $PRIVATE_KEY -pubout -outform DER|tail -c 65|xxd -p -c 65 > $BITCOIN_PUBLIC_KEY
