jvm-ssl-utils

SSL certificate management on the JVM.

Installation

Add the following dependency to your project.clj file:

Handling X.509 certificate extensions

X.509 certificates and certificate requests can optionally contain a list of extensions which may further specify how the certificate is to be used. Each of the functions which either return or accept X.509 extensions expect them to be a list of maps. Each map contains the following keys:

• oid A string containing the extension's OID.
• critical A boolean which is true if the extension is marked as critical.
• value A primitive value, or data structure representing the data contained in the extension. The exact format of the value data is dependent upon the OID of the extension, which are described below.

Supported extensions and their data structures

Currently only a subset of the defined X.509 extensions are supported by this library, more will be supported in the future. Note that in the Java API all map keys are snake-cased strings, in the Clojure API all map keys are kebab-cased keywords.

Subject Key Identifier: 2.5.29.14

When writing a Subject Key Identifier extension, set the value key of the extension map to an instance of the subject's java.security.PublicKey. When extension is written to the certificate or certificate request then the SHA-1 hash of the key will be computed and written to the object.

When a Subject Key Identifier extensions is read from a certificate its value is a byte array containing the SHA-1 hash.

Key Usage: 2.5.29.15

Key usage is defined by a set of keywords which indicate how the certificate is to be used. The following keywords are used:

Keyword	Meaning
:digital-signature	The public key can be used for encrypting data.
:non-repudiation	The public key is used to verify digital signatures.
:key-encipherment	The certificate will be used with a protocol that encrypts keys.
:data-encipherment	The public key is used for encrypting user data.
:key-agreement	The sender and receiver of the public key need to derive the key without using encryption.
:key-cert-sign	The subject public key is used to verify a signature on certificates.
:crl-sign	The subject public key is to verify a signature on a CRL.
:encipher-only	The public key is to be used only for enciphering data while performing key agreement.
:decipher-only	The public key is to be used only for deciphering data while performing key agreement.

Subject Alternative Names: 2.5.29.17

This extensions is represented as a map where each key is name type, and the value is a list of names of that type to be aliased. The following hash keys correspond to the listed types.

Key	Type
:rfc822-name	An RFC822 compliant e-mail address
:dns-name	A host name which can be resolved by DNS
:directory-name	A fully-qualified DN
:uri	A URI
:ip	An IP address

For example:

(let [exts [;; Subject alternative DNS names
            {:oid      "2.5.29.17"
             :value    {:dns-name ["aliasname1.domain.tld"
                                   "aliasname2.domain.tld"]}
             :critical false}
            ;; Issuer alternative DNS name
            {:oid      "2.5.29.18"
             :value    {:dns-name ["aliasname3.domain.tld"}
             :critical false}]])

Issuer Alternative Names: 2.5.29.18

The format of this extension is the same as Subject Alternative Names above.

Basic Constraints: 2.5.29.19

Defines basic constraints for the certificate as a map with these two keys:

Key	Type	Value
:is-ca	boolean	True if the subject may act as a CA.
:path-len-constraint	integer	If this is a CA cert, the max certification path length. A value of nil or absence of this key indicates that no length is imposed.

CRL Number: 2.5.29.20

The value of this extension is a java.math.BigInteger representing the sequence number for a CRL (Certificate Revocation List).

Authority Key Identifier: 2.5.29.35

When writing this extension to a certificate the value should be a map which contains one of the following combinations of keys (with corresponding values):

• :public-key
• :serial-number and :issuer-dn
• :public-key, :serial-number, and :issuer-dn

These keys are defined as:

Key	Type	Value
:public-key	java.security.PublicKey	CA's public key.
:issuer-dn	string	A Distinguished Name identifying the CA.
:serial-number	java.math.BigInteger	CA's serial number.

When this extension is read back from a certificate, it will be a map containing the following keys. Note that if the corresponding value for any key was not specified, it will be set to nil.

Key	Type	Value
:key-identifier	byte vector	A byte array containing the SHA-1 hash of the CA's public key.
:issuer	string	A Distinguished Name identifying the CA.
:serial-number	java.math.BigInteger	CA's serial number.

Extended Key Usage: 2.5.29.37

Netscape Certificate Comment: 2.16.840.1.113730.1.13

The value of this extension is a string containing a comment about the certificate.

License

See LICENSE file.

Support

Please log issues in the GitHub issue tracker.

We use semantic version numbers for our releases, and recommend that users stay as up-to-date as possible by upgrading to patch releases and minor releases as they become available.

Bugfixes and ongoing development will occur in minor releases for the current major version. Security fixes will be backported to a previous major version on a best-effort basis, until the previous major version is no longer maintained.