2 Interface to OpenSSL BIO library
4 from ctypescrypto import libcrypto,pyver, inttype
5 from ctypes import c_char_p, c_void_p, c_int, string_at, c_long
6 from ctypes import POINTER, byref, create_string_buffer
9 Provides interface to OpenSSL memory bios
10 use str() or unicode() to get contents of writable bio
11 use bio member to pass to libcrypto function
13 def __init__(self, data=None):
15 If data is specified, creates read-only BIO. If data is
16 None, creates writable BIO, contents of which can be retrieved
20 method = libcrypto.BIO_s_mem()
21 self.bio = libcrypto.BIO_new(method)
23 self.bio = libcrypto.BIO_new_mem_buf(c_char_p(data), len(data))
27 Cleans up memory used by bio
29 if hasattr(self,'bio'):
30 libcrypto.BIO_free(self.bio)
35 Returns current contents of buffer as byte string
37 string_ptr = c_char_p(None)
38 string_len = libcrypto.BIO_ctrl(self.bio, 3, 0, byref(string_ptr))
39 return string_at(string_ptr, string_len)
41 def __unicode__(self):
43 Attempts to interpret current contents of buffer as UTF-8 string
44 and convert it to unicode
46 return self.__bytes__().decode("utf-8")
51 def read(self, length=None):
53 Reads data from readble BIO. For test purposes.
54 @param length - if specifed, limits amount of data read.
55 If not BIO is read until end of buffer
57 if not length is None:
58 if not isinstance(length, inttype) :
59 raise TypeError("length to read should be number")
60 buf = create_string_buffer(length)
61 readbytes = libcrypto.BIO_read(self.bio, buf, length)
63 raise NotImplementedError("Function is not supported by" +
69 return buf.raw[:readbytes]
71 buf = create_string_buffer(1024)
75 readbytes = libcrypto.BIO_read(self.bio, buf, 1024)
77 raise NotImplementedError("Function is not supported by " +
82 out += buf.raw[:readbytes]
85 def write(self, data):
87 Writes data to writable bio. For test purposes
90 if isinstance(data, unicode):
91 data = data.encode("utf-8")
95 if not isinstance(data, bytes):
96 data=str(data).encode("utf-8")
98 written = libcrypto.BIO_write(self.bio, data, len(data))
100 raise NotImplementedError("Function not supported by this BIO")
101 if written < len(data):
102 raise IOError("Not all data were successfully written")
106 Resets the read-only bio to start and discards all data from
109 libcrypto.BIO_ctrl(self.bio, 1, 0, None)
112 libcrypto.BIO_s_mem.restype = c_void_p
113 libcrypto.BIO_new.restype = c_void_p
114 libcrypto.BIO_new.argtypes = (c_void_p, )
115 libcrypto.BIO_ctrl.restype = c_long
116 libcrypto.BIO_ctrl.argtypes = (c_void_p, c_int, c_long, POINTER(c_char_p))
117 libcrypto.BIO_read.argtypes = (c_void_p, c_char_p, c_int)
118 libcrypto.BIO_write.argtypes = (c_void_p, c_char_p, c_int)
119 libcrypto.BIO_free.argtypes = (c_void_p, )
120 libcrypto.BIO_new_mem_buf.restype = c_void_p
121 libcrypto.BIO_new_mem_buf.argtypes = (c_char_p, c_int)