def generate_rsa_sha1_signature(client_private_key,
method, url, oauth_params=None,
*args, **kwargs):
"""
Calculates an RSA-SHA1 OAuth signature.
:see: RSA-SHA1 (http://tools.ietf.org/html/rfc5849#section-3.4.3)
:param client_private_key:
PEM-encoded RSA private key.
:param method:
Base string HTTP method.
:param url:
Base string URL that may include a query string.
All protocol-specific paramters will be ignored from the query string.
:param oauth_params:
Base string protocol-specific query parameters.
All non-protocol parameters will be ignored.
:returns:
RSA-SHA1 signature.
"""
from pyoauth.crypto.rsa import create_private_key
oauth_params = oauth_params or {}
base_string = generate_signature_base_string(method, url, oauth_params)
key = create_private_key(client_private_key)
return base64_encode(key.pkcs1_v1_5_sign(sha1_digest(base_string)))
def der_to_pem(der_cert_bytes, pem_header, pem_footer):
"""
Takes a certificate in binary DER format and returns the
PEM version of it as a string.
Taken from the Python SSL module.
:param der_cert_bytes:
A byte string of the DER.
:param pem_header:
The PEM header to use.
:param pem_footer:
The PEM footer to use.
"""
# Does what base64.b64encode without the `altchars` argument does.
f = base64_encode(der_cert_bytes)
return (pem_header + '\n' +
textwrap.fill(f, 64) + '\n' +
pem_footer + '\n')
