1. Oct 21, 2016 PKCS #8 defines a standard syntax for storing private key information. There are 2 ways we can store private key in pkcs8 format. 1) unencrypted key 2) encrypted key I will create both types of keys in java and store them in file. After that I will read them from file and create privatekey java object from stored file.
2. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more Generate PKCS#8 private key with openssl closed.

1. Openssl Create Pkcs8
2. Public Private Key Encryption
3. Openssl Create Private Key Pkcs8
4. Private Key Definition
5. Extract Private Key Openssl

To perform the following actions for Windows or Linux, you must have OpenSSL installed on your system.

Generating the Private Key -- Windows

In Windows:

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1. Open the Command Prompt (Start > Programs > Accessories > Command Prompt).

The private key you want to convert must already be an RSA private key and be between 1024 and 4096 bits in length, inclusive. It is only possible to convert the storage format for the private key. Changing the type of key and its length is not possible and requires generation of a new private key. Opensslbinopenssl.exe pkcs8 -in. #openssl rsa -in sample.key -out sampleprivate.key. Get the Public Key from key pair #openssl rsa -in sample.key -pubout -out samplepublic.key. Need to do some modification to the private key - to pkcs8 format #openssl pkcs8 -topk8 -inform PEM -in sampleprivate.key -outform PEM -nocrypt Copy the output and save it as sampleprivatepkcs8. Mostly because I just want to convert/create a private key later in PKCS#8 format using: openssl pkcs8 -topk8 -v2 des3. I read this can be done independent of the public key after the fact. So I used 'openssl' and just generated a key, but I couldn't get it into the 'ssh-rsa' format.

2. Navigate to the following folder:

C:Program FilesListManagertclwebbincerts

3. Type the following:

openssl genrsa -out rsa.private 1024

4. Press ENTER. The private key is generated and saved in a file named 'rsa.private' located in the same folder.

NOTE The number '1024' in the above command indicates the size of the private key. You can choose one of five sizes: 512, 758, 1024, 1536 or 2048 (these numbers represent bits). The larger sizes offer greater security, but this is offset by a penalty in CPU performance. We recommend the best practice size of 1024.

Generating the Public Key -- Windows

1. At the command prompt, type the following:

openssl rsa -in rsa.private -out rsa.public -pubout -outform PEM

2. Press ENTER. The public key is saved in a file named rsa.public located in the same folder.

Generating the Private Key -- Linux

1. Open the Terminal.

2. Navigate to the folder with the ListManager directory.

3. Type the following:

openssl genrsa -out rsa.private 1024

4. Press ENTER. The private key is generated and saved in a file named 'rsa.private' located in the same folder.

Generating the Public Key -- Linux

1. Open the Terminal.

2. Type the following:

openssl rsa -in rsa.private -out rsa.public -pubout -outform PEM

2. Press ENTER. The public key is saved in a file named rsa.public located in the same folder.

SYNOPSIS

openssl pkcs8 [-topk8] [-informPEMDER] [-outformPEMDER] [-infilename] [-passinarg] [-outfilename] [-passoutarg] [-noiter] [-nocrypt] [-nooct] [-embed] [-nsdb] [-v2alg] [-v1alg]

DESCRIPTION

The pkcs8 command processes private keys in PKCS#8 format. It can handle both unencrypted PKCS#8 PrivateKeyInfo format and EncryptedPrivateKeyInfo format with a variety of PKCS#5 (v1.5 and v2.0) and PKCS#12 algorithms.

Options

Normally a PKCS#8 private key is expected on input and a traditional format private key will be written. With the -topk8 option the situation is reversed: it reads a traditional format private key and writes a PKCS#8 format key.

specifies the input format. If a PKCS#8 format key is expected on input then either a DER or PEM encoded version of a PKCS#8 key will be expected. Otherwise the DER or PEM format of the traditional format private key is used.

Openssl Create Pkcs8

specifies the output format, the options have the same meaning as the -inform option.

specifies the input file name to read a key from or standard input if this option is not specified. If the key is encrypted a pass phrase will be prompted for.

Public Private Key Encryption

specifies the input file password source. For more information about the format of arg, see the PASS PHRASE ARGUMENTS section in the openssl reference page.

specifies the output file name to write a key to or standard output by default. If any encryption options are set then a pass phrase will be prompted for. The output file name should not be the same as the input file name.

specifies the output file password source. For more information about the format of arg, see the PASS PHRASE ARGUMENTS section in the openssl reference page.

PKCS#8 keys generated or input are normally PKCS#8 EncryptedPrivateKeyInfo structures using an appropriate password based encryption algorithm. With this option an unencrypted PrivateKeyInfo structure is expected or output. This option does not encrypt private keys at all and should only be used when absolutely necessary. Certain software such as some versions of Java code signing software used unencrypted private keys.

generates RSA private keys in a broken format that some software uses. Specifically the private key should be enclosed in a OCTET STRING but some software just includes the structure itself without the surrounding OCTET STRING.

generates DSA keys in a broken format. The DSA parameters are embedded inside the PrivateKey structure. In this form the OCTET STRING contains an ASN1 SEQUENCE consisting of two structures: a SEQUENCE containing the parameters and an ASN1 INTEGER containing the private key.

generates DSA keys in a broken format compatible with Netscape private key databases. The PrivateKey contains a SEQUENCE consisting of the public and private keys respectively.

enables the use of PKCS#5 v2.0 algorithms. Normally PKCS#8 private keys are encrypted with the password based encryption algorithm called pbeWithMD5AndDES-CBC this uses 56 bit DES encryption but it was the strongest encryption algorithm supported in PKCS#5 v1.5. Using the -v2 option PKCS#5 v2.0 algorithms are used which can use any encryption algorithm such as 168 bit triple DES or 128 bit RC2 however not many implementations support PKCS#5 v2.0 yet. If you are just using private keys with OpenSSL then this doesn't matter.

The alg argument is the encryption algorithm to use, valid values include des, des3, and rc2. It is recommended that des3 is used.

specifies a PKCS#5 v1.5 or PKCS#12 algorithm to use. A complete list of possible algorithms is included below.

NOTES

The encrypted form of a PEM encode PKCS#8 files uses the following headers and footers:

The unencrypted form uses:

Private keys encrypted using PKCS#5 v2.0 algorithms and high iteration counts are more secure that those encrypted using the traditional SSLeay compatible formats. So if additional security is considered important the keys should be converted.

The default encryption is only 56 bits because this is the encryption that most current implementations of PKCS#8 will support.

Some software may use PKCS#12 password based encryption algorithms with PKCS#8 format private keys: these are handled automatically but there is no option to produce them.

It is possible to write out DER encoded encrypted private keys in PKCS#8 format because the encryption details are included at an ASN1 level whereas the traditional format includes them at a PEM level.

PKCS#5 v1.5 and PKCS#12 algorithms.

Various algorithms can be used with the -v1 command line option, including PKCS#5 v1.5 and PKCS#12. These are described in more detail below.

These algorithms were included in the original PKCS#5 v1.5 specification. They only offer 56 bits of protection since they both use DES.

These algorithms are not mentioned in the original PKCS#5 v1.5 specification but they use the same key derivation algorithm and are supported by some software. They are mentioned in PKCS#5 v2.0. They use either 64 bit RC2 or 56 bit DES.

These algorithms use the PKCS#12 password based encryption algorithm and allow strong encryption algorithms like triple DES or 128 bit RC2 to be used.

EXAMPLES

Convert a private from traditional to PKCS#5 v2.0 format using triple DES:

Convert a private key to PKCS#8 using a PKCS#5 1.5 compatible algorithm (DES):

Convert a private key to PKCS#8 using a PKCS#12 compatible algorithm (3DES):

Read a DER unencrypted PKCS#8 format private key:

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Convert a private key from any PKCS#8 format to traditional format:

STANDARDS

Openssl Create Private Key Pkcs8

Test vectors from this PKCS#5 v2.0 implementation were posted to the pkcs-tng mailing list using triple DES, DES and RC2 with high iteration counts, several people confirmed that they could decrypt the private keys produced and Therefore it can be assumed that the PKCS#5 v2.0 implementation is reasonably accurate at least as far as these algorithms are concerned.

The format of PKCS#8 DSA (and other) private keys is not well documented: it is hidden away in PKCS#11 v2.01, section 11.9. OpenSSL's default DSA PKCS#8 private key format complies with this standard.

BUGS

Private Key Definition

There should be an option that prints out the encryption algorithm in use and other details such as the iteration count.

PKCS#8 using triple DES and PKCS#5 v2.0 should be the default private key format for OpenSSL: for compatibility several of the utilities use the old format at present.

AVAILABILITY

PTC MKS Toolkit for System Administrators
PTC MKS Toolkit for Developers
PTC MKS Toolkit for Interoperability
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

SEE ALSO

Commands:

openssl dsa, openssl gendsa, openssl genrsa, openssl rsa

Extract Private Key Openssl

PTC MKS Toolkit 10.2 Documentation Build 28.