keytool -importkeystore -srckeystore test.p12 -srcstoretype pkcs12 -destkeystore test.jks The key is stored in the file privatekey.pem and it is in the “PEM” format. Concatenate all *.pem files into one pem file, like all.pem Then create keystore in p12 format with private key + all.pem. openssl rsa -in mycert.pem -out newcert.pem openssl x509 -in mycert.pem >>newcert.pem The passphrase will spit out a warning on the logs saying that it wasn't able to get the RSAA private key, which in turn disables TLS support. Java load RSA private key from PEM file. # generate a 2048-bit RSA private key $ openssl genrsa -out private_key.pem 2048 # convert private Key to PKCS#8 format (so Java can read it) $ openssl pkcs8 -topk8 -inform PEM -outform DER -in private_key.pem \ -out private_key.der -nocrypt # output public key portion in DER format (so Java can read it) $ openssl rsa -in private_key.pem -pubout -outform DER -out public_key.der OpenSSL can load the key because it is failing to validate an ASN.1 Integer is properly encoded. PEM Files with SSH. Protect your existing private rsa key with a passphrase. The public key is publicized and the private key is kept secret. When data is encrypted by one key, it can only be decrypted using the other key. The word asymmetric denotes the use of a pair of keys for encryption – a public key and a private key. 5. Hi Derderer, Thank you for posting here. Introduction. Save to your folder(s) Save/Load or.. Write/Read or.. Store/Retrieve Private Key/Public Key to/from disk/file :D. Expand | Embed | Plain Text. # Generate a certificate signing request with the private key: openssl req -new -key rsa.key -out rsa.csr # Sign request with private key: openssl x509 -req -days 10000 -in rsa.csr -signkey rsa.key -out rsa.crt # Generate an RSA private key and convert it to PKCS8 wraped in PEM keytool -genkey -keyalg RSA -alias endeca -keystore keystore.ks keytool -delete -alias endeca -keystore keystore.ks The -genkey command creates the default certificate shown below. This creates a new RSA private key with 2048 bits length. openssl asn1dump < file.pem where file.pem contains the private key below. 1. According to your description, you want to convert Java code to C# correctly and use the RSA private key from *.pem file. openssl pkcs12 -export -inkey private.key -in all.pem -name test -out test.p12 Then export p12 into jks . The PEM format is essentially a base64-encoded variant of a DER-encoded structure. You need to convert your private key to PKCS8 format using following command: openssl pkcs8 -topk8 -inform PEM -outform DER -in private_key_file -nocrypt > pkcs8_key After this your java program can … (This is a temporary certificate that is subsequently deleted by the -delete command, so it does not matter what information you enter here.) If you’ve ever run ssh-keygen to use ssh without a password, your ~/.ssh/id_rsa is a PEM file, just without the extension. PEM files are also used for SSH. You need to convert your private key to PKCS8 format using following command: openssl pkcs8 -topk8 -inform PEM -outform DER -in private_key_file -nocrypt > pkcs8_key After this your java program can read it. Save/Load Private and Public Key to/from a file / Published in: Java. How to Read PEM File to Get Public and Private Keys, Despite the fact that PKCS1 is also a popular format used to store cryptographic keys (only RSA keys), Java doesn't support it on its own. 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