diff options
Diffstat (limited to 'rsa/key.py')
| -rw-r--r-- | rsa/key.py | 60 |
1 files changed, 56 insertions, 4 deletions
@@ -3,11 +3,19 @@ Create new keys with the newkeys() function. It will give you a PublicKey and a PrivateKey object. +Loading and saving keys requires the pyasn1 module. This module is imported as +late as possible, such that other functionality will remain working in absence +of pyasn1. + ''' import rsa.prime import rsa.pem +PEM_PRIVATE_KEY_START = '-----BEGIN RSA PRIVATE KEY-----' +PEM_PRIVATE_KEY_END = '-----END RSA PRIVATE KEY-----' + + class PublicKey(object): '''Represents a public RSA key. @@ -283,6 +291,43 @@ def load_private_key_der(keyfile): return PrivateKey(*priv[1:9]) +def save_private_key_der(priv_key): + '''Saves the private key in DER format. + + @param priv_key: the private key to save + @returns: the DER-encoded private key. + ''' + + from pyasn1.type import univ, namedtype, tag + from pyasn1.codec.der import encoder + + class AsnPrivKey(univ.Sequence): + componentType = namedtype.NamedTypes( + namedtype.NamedType('version', univ.Integer()), + namedtype.NamedType('modulus', univ.Integer()), + namedtype.NamedType('publicExponent', univ.Integer()), + namedtype.NamedType('privateExponent', univ.Integer()), + namedtype.NamedType('prime1', univ.Integer()), + namedtype.NamedType('prime2', univ.Integer()), + namedtype.NamedType('exponent1', univ.Integer()), + namedtype.NamedType('exponent2', univ.Integer()), + namedtype.NamedType('coefficient', univ.Integer()), + ) + + # Create the ASN object + asn_key = AsnPrivKey() + asn_key.setComponentByName('version', 0) + asn_key.setComponentByName('modulus', priv_key.n) + asn_key.setComponentByName('publicExponent', priv_key.e) + asn_key.setComponentByName('privateExponent', priv_key.d) + asn_key.setComponentByName('prime1', priv_key.p) + asn_key.setComponentByName('prime2', priv_key.q) + asn_key.setComponentByName('exponent1', priv_key.exp1) + asn_key.setComponentByName('exponent2', priv_key.exp2) + asn_key.setComponentByName('coefficient', priv_key.coef) + + return encoder.encode(asn_key) + def load_private_key_pem(keyfile): '''Loads a PEM-encoded private key file. @@ -294,12 +339,19 @@ def load_private_key_pem(keyfile): @return: a PrivateKey object ''' - PEM_START = '-----BEGIN RSA PRIVATE KEY-----' - PEM_END = '-----END RSA PRIVATE KEY-----' - - der = rsa.pem.load_pem(keyfile, PEM_START, PEM_END) + der = rsa.pem.load_pem(keyfile, PEM_PRIVATE_KEY_START, PEM_PRIVATE_KEY_END) return load_private_key_der(der) +def save_private_key_pem(priv_key): + '''Saves a PEM-encoded private key file. + + @param keyfile: a PrivateKey object + @return: contents of a PEM-encoded file that contains the private key. + ''' + + der = save_private_key_der(priv_key) + return rsa.pem.save_pem(der, PEM_PRIVATE_KEY_START, PEM_PRIVATE_KEY_END) + __all__ = ['PublicKey', 'PrivateKey', 'newkeys', 'load'] |