extract multiple PEM encoded certs from a single file. yak shave

extract_certs_from_file.py

def extract_pem_certs(str):
    buf = None
    certs = []
    for line in str.split('\n'):
        if 'BEGIN CERTIFICATE' in line and buf is None:
            buf = line + '\n'
        elif 'END CERTIFICATE' in line:
            buf += line + '\n'
            certs.append(buf)
            buf = None
        elif buf is not None:
            buf += line + '\n'
        else:
            # garbage, throw it away
            pass
    return certs


d = open('test.crts', 'r').read()
for cert in extract_pem_certs(d):
    print cert