Initial commit of modules

[oss/ctypescrypto.git] / ctypescrypto / bio.py

diff --git a/ctypescrypto/bio.py b/ctypescrypto/bio.py
new file mode 100644 (file)
index 0000000..1263ce6
--- /dev/null
+++ b/ctypescrypto/bio.py
@@ -0,0 +1,30 @@
+from ctypescrypto import libcrypto
+from ctypes import c_char_p, c_int, string_at
+class Membio:
+       """ 
+               Provides interface to OpenSSL memory bios 
+               use str() to get contents of writable bio
+               use bio member to pass to libcrypto function
+       """
+       def __init__(self,data=None):
+               """ If data is specified, creates read-only BIO. If data is
+                       None, creates writable BIO
+               """
+               if data is None:
+                       method=libcrypto.BIO_s_mem()
+                       self.bio=libcrypto.BIO_new(method)
+               else:
+                       self.bio=libcrypto.BIO_new_mem_buf(c_char_p(data),len(data))q
+       def __del__(self):
+               libcrypto.BIO_free(self.bio)
+               del(self.bio)
+       def __str__(self):
+               p=c_char_p(None)
+               l=BIO_get_mem_data(self.bio,byref(p))
+               return string_at(p,l)
+#FIXME TODO - BIO should have stream-like interface
+libcrypto.BIO_s_mem.restype=c_void_p
+libcrypto.BIO_new.restype=c_void_p
+libcrypto.BIO_new.argtypes=(c_void_p,)
+libcrypto.BIO_get_mem_data.restype=c_long
+libcrypto.BIO_get_mem_data.argtypes=(c_void_p,POINTER(c_char_p))