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genpkey - generate a private key

opensslgenpkey[-out filename][-outform PEM DER][-pass arg][-cipher][-engine id][-paramfile file][-algorithm alg][-pkeyopt opt:value][-genparam][-text]

Support Center Knowledgebase DirectAdmin Apache Related Information modssl: Init: Failed to generate temporary 512 bit RSA private key. Add to Favourites Print this Article. Modssl: Init: Failed to generate temporary 512 bit RSA private key. A RSA public key consists in several (big) integer values, and a RSA private key consists in also some integer values. Though the contents differ, a RSA public key and the corresponding RSA private key share a common mathematical structure, and, in particular, both include a specific value called the modulus.

The genpkey command generates a private key.

-out filename

the output filename. If this argument is not specified then standard output isused.

  1. DSA and RSA 1024 bit are deprecated now ΒΆ If you've created your key more than about four years ago with the default options it's probably insecure (RSA keys ( ssh-dss in OpenSSH format) recently.
  2. Generate 1024 bit RSA keypair and save public key in ASN.1 format (hex) in node.js. Hopefully someone will be good enough to give me a little help here. I need to generate a 1024 bit RSA key for one time use (gets discarded after each run) and pass the public key to a remote client.
-outform DER PEM

This specifies the output format DER or PEM.

-pass arg

the output file password source. For more information about the format of argsee the PASS PHRASE ARGUMENTS section in openssl.

-cipher

This option encrypts the private key with the supplied cipher. Any algorithmname accepted by EVP_get_cipherbyname() is acceptable such as des3.

-engine id

specifying an engine (by its unique id string) will cause genpkeyto attempt to obtain a functional reference to the specified engine,thus initialising it if needed. The engine will then be set as the defaultfor all available algorithms. If used this option should precede all otheroptions.

-algorithm alg

public key algorithm to use such as RSA, DSA or DH. If used this option mustprecede any -pkeyopt options. The options -paramfile and -algorithmare mutually exclusive.

-pkeyopt opt:value

set the public key algorithm option opt to value. The precise set ofoptions supported depends on the public key algorithm used and itsimplementation. See KEY GENERATION OPTIONS below for more details.

-genparam

generate a set of parameters instead of a private key. If used this option mustprecede and -algorithm, -paramfile or -pkeyopt options.

-paramfile filename

Some public key algorithms generate a private key based on a set of parameters.They can be supplied using this option. If this option is used the public keyalgorithm used is determined by the parameters. If used this option mustprecede and -pkeyopt options. The options -paramfile and -algorithmare mutually exclusive.

-text

Print an (unencrypted) text representation of private and public keys andparameters along with the PEM or DER structure.

The options supported by each algorith and indeed each implementation of analgorithm can vary. The options for the OpenSSL implementations are detailedbelow.

rsa_keygen_bits:numbits

The number of bits in the generated key. If not specified 1024 is used.

rsa_keygen_pubexp:value

The RSA public exponent value. This can be a large decimal orhexadecimal value if preceded by 0x. Default value is 65537.

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dsa_paramgen_bits:numbits

The number of bits in the generated parameters. If not specified 1024 is used.

dh_paramgen_prime_len:numbits

The number of bits in the prime parameter p. Starcraft 2 key generator free no survey.

dh_paramgen_generator:value

The value to use for the generator g.

dh_rfc5114:num

If this option is set then the appropriate RFC5114 parameters are usedinstead of generating new parameters. The value num can take thevalues 1, 2 or 3 corresponding to RFC5114 DH parameters consisting of1024 bit group with 160 bit subgroup, 2048 bit group with 224 bit subgroupand 2048 bit group with 256 bit subgroup as mentioned in RFC5114 sections2.1, 2.2 and 2.3 respectively.

ec_paramgen_curve:curve

the EC curve to use.

Gost 2001 support is not enabled by default. To enable this algorithm,one should load the ccgost engine in the OpenSSL configuration file.See README.gost file in the engines/ccgost directiry of the sourcedistribution for more details.

Use of a parameter file for the GOST R 34.10 algorithm is optional.Parameters can be specified during key generation directly as well asduring generation of parameter file.

paramset:name

Specifies GOST R 34.10-2001 parameter set according to RFC 4357.Parameter set can be specified using abbreviated name, object short name ornumeric OID. Following parameter sets are supported:

The use of the genpkey program is encouraged over the algorithm specificutilities because additional algorithm options and ENGINE provided algorithmscan be used.

Generate 1024 Bit Rsa Key

Generate an RSA private key using default parameters:

Encrypt output private key using 128 bit AES and the passphrase 'hello':

1024 Bit Rsa

Generate a 2048 bit RSA key using 3 as the public exponent:

Generate 1024 bit DSA parameters:

Generate DSA key from parameters:

Generate 1024 bit DH parameters:

Output RFC5114 2048 bit DH parameters with 224 bit subgroup:

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Generate DH key from parameters: