X-Git-Url: https://code.wpia.club/?a=blobdiff_plain;f=lib%2Fopenssl%2Fdoc%2FHOWTO%2Fkeys.txt;fp=lib%2Fopenssl%2Fdoc%2FHOWTO%2Fkeys.txt;h=7ae2a3a11833a3750bc505d1ab9cfb626447055d;hb=9ff1530871deeb0f7eaa35ca0db6630724045e4a;hp=0000000000000000000000000000000000000000;hpb=25b73076b01ae059da1a2e9a1677e00788ada620;p=cassiopeia.git diff --git a/lib/openssl/doc/HOWTO/keys.txt b/lib/openssl/doc/HOWTO/keys.txt new file mode 100644 index 0000000..7ae2a3a --- /dev/null +++ b/lib/openssl/doc/HOWTO/keys.txt @@ -0,0 +1,73 @@ + + HOWTO keys + +1. Introduction + +Keys are the basis of public key algorithms and PKI. Keys usually +come in pairs, with one half being the public key and the other half +being the private key. With OpenSSL, the private key contains the +public key information as well, so a public key doesn't need to be +generated separately. + +Public keys come in several flavors, using different cryptographic +algorithms. The most popular ones associated with certificates are +RSA and DSA, and this HOWTO will show how to generate each of them. + + +2. To generate a RSA key + +A RSA key can be used both for encryption and for signing. + +Generating a key for the RSA algorithm is quite easy, all you have to +do is the following: + + openssl genrsa -des3 -out privkey.pem 2048 + +With this variant, you will be prompted for a protecting password. If +you don't want your key to be protected by a password, remove the flag +'-des3' from the command line above. + + NOTE: if you intend to use the key together with a server + certificate, it may be a good thing to avoid protecting it + with a password, since that would mean someone would have to + type in the password every time the server needs to access + the key. + +The number 2048 is the size of the key, in bits. Today, 2048 or +higher is recommended for RSA keys, as fewer amount of bits is +consider insecure or to be insecure pretty soon. + + +3. To generate a DSA key + +A DSA key can be used for signing only. This is important to keep +in mind to know what kind of purposes a certificate request with a +DSA key can really be used for. + +Generating a key for the DSA algorithm is a two-step process. First, +you have to generate parameters from which to generate the key: + + openssl dsaparam -out dsaparam.pem 2048 + +The number 2048 is the size of the key, in bits. Today, 2048 or +higher is recommended for DSA keys, as fewer amount of bits is +consider insecure or to be insecure pretty soon. + +When that is done, you can generate a key using the parameters in +question (actually, several keys can be generated from the same +parameters): + + openssl gendsa -des3 -out privkey.pem dsaparam.pem + +With this variant, you will be prompted for a protecting password. If +you don't want your key to be protected by a password, remove the flag +'-des3' from the command line above. + + NOTE: if you intend to use the key together with a server + certificate, it may be a good thing to avoid protecting it + with a password, since that would mean someone would have to + type in the password every time the server needs to access + the key. + +-- +Richard Levitte