RSA Key Tools

Tools

• format rsa key
• pkcs1 to pkcs8
• pkcs8 to pkcs1
• get cert serial number

Usage

go install github.com/fifsky/ktool

Get certificate serial number

ktool serial -f=./testdata/cert.pem

Format pkcs8 private key

ktool format -f=./testdata/no_format_pkcs8.txt

Format pkcs1 private key

ktool format -f=./testdata/no_format_pkcs1.txt

Format public key

ktool format -f=./testdata/no_format_public_key.txt

format automatically adds the key preamble

Convert private key to pkcs1, suppert pem and der

ktool convert -f=./testdata/pkcs8.pem -t=pkcs1

Convert private key to pkcs8, suppert pem and der

ktool convert -f=./testdata/pkcs1.pem -t=pkcs8

Show private key format:

ktool info -f=./testdata/pkcs1.pem
// Output: file ./testdata/pkcs1.pem format is: PKCS1

PS

public key pkcs8 to pkcs1

openssl rsa -pubin -in public_key_pkcs1.pem -RSAPublicKey_out

private pem to der

openssl rsa -outform der -in pkcs8.pem | base64

public pem to der

openssl rsa -pubin -outform DER -in public_key.pem | base64

rsa der public key to pem

cat public_key | base64 --decode | openssl rsa -pubin -inform DER -outform PEM -out public_key.pem

rsa der private key to pem

cat pkcs8_private_key | base64 --decode | openssl rsa -inform DER -outform PEM -out pkcs8.pem