X-Git-Url: https://wagner.pp.ru/gitweb/?a=blobdiff_plain;f=ctypescrypto%2Frand.py;h=d9e966d67c67f6635751ce54338990ae788915eb;hb=1c45d3f211f72ce19c9e92be868c15afe5e6ec62;hp=92e67e96b0dbbe303e663d077362c904656a7852;hpb=954b6dc9e3312f8d8b49f20f8466e6d2a8342f35;p=oss%2Fctypescrypto.git

diff --git a/ctypescrypto/rand.py b/ctypescrypto/rand.py
index 92e67e9..d9e966d 100644
--- a/ctypescrypto/rand.py
+++ b/ctypescrypto/rand.py
@@ -6,40 +6,41 @@ from ctypes import create_string_buffer, c_char_p, c_int, c_double
 from ctypescrypto import libcrypto
 from ctypescrypto.exception import LibCryptoError
 
-__all__ = ['RandError','bytes','pseudo_bytes','seed','status']
+__all__ = ['RandError', 'bytes', 'pseudo_bytes', 'seed', 'status']
 
 class RandError(LibCryptoError):
+    """ Exception raised when openssl function return error """
     pass
 
-def bytes( num, check_result=False):
+def bytes(num, check_result=False):
     """
-        Returns num bytes of cryptographically strong pseudo-random
-        bytes. If checkc_result is True, raises error if PRNG is not
-        seeded enough
+    Returns num bytes of cryptographically strong pseudo-random
+    bytes. If checkc_result is True, raises error if PRNG is not
+    seeded enough
     """
 
-    if num <= 0 :
+    if num <= 0:
         raise ValueError("'num' should be > 0")
-    buffer = create_string_buffer(num)
-    result = libcrypto.RAND_bytes(buffer, num) 
+    buf = create_string_buffer(num)
+    result = libcrypto.RAND_bytes(buf, num)
     if check_result and result == 0:
         raise RandError("Random Number Generator not seeded sufficiently")
-    return buffer.raw[:num]
+    return buf.raw[:num]
 
 def pseudo_bytes(num):
     """
-        Returns num bytes of pseudo random data.  Pseudo- random byte
-        sequences generated by pseudo_bytes() will be unique if
-        they are of sufficient length, but are not necessarily
-        unpredictable. They can be used for non-cryptographic purposes
-        and for certain purposes in cryptographic protocols, but usually
-        not for key generation etc.
+    Returns num bytes of pseudo random data.  Pseudo- random byte
+    sequences generated by pseudo_bytes() will be unique if
+    they are of sufficient length, but are not necessarily
+    unpredictable. They can be used for non-cryptographic purposes
+    and for certain purposes in cryptographic protocols, but usually
+    not for key generation etc.
     """
-    if num <= 0 :
+    if num <= 0:
         raise ValueError("'num' should be > 0")
-    buffer = create_string_buffer(num)
-    libcrypto.RAND_pseudo_bytes(buffer, num)
-    return buffer.raw[:num]
+    buf = create_string_buffer(num)
+    libcrypto.RAND_pseudo_bytes(buf, num)
+    return buf.raw[:num]
 
 def seed(data, entropy=None):
     """
@@ -47,24 +48,24 @@ def seed(data, entropy=None):
         If entropy is not None, it should be floating point(double)
         value estimating amount of entropy  in the data (in bytes).
     """
-    if not isinstance(data,str):
+    if not isinstance(data, str):
         raise TypeError("A string is expected")
     ptr = c_char_p(data)
     size = len(data)
     if entropy is None:
         libcrypto.RAND_seed(ptr, size)
-    else :
+    else:
         libcrypto.RAND_add(ptr, size, entropy)
 
 def status():
     """
-        Returns 1 if random generator is sufficiently seeded and 0
-        otherwise
+    Returns 1 if random generator is sufficiently seeded and 0
+    otherwise
     """
 
     return libcrypto.RAND_status()
-    
-libcrypto.RAND_add.argtypes=(c_char_p,c_int,c_double)
-libcrypto.RAND_seed.argtypes=(c_char_p,c_int)
-libcrypto.RAND_pseudo_bytes.argtypes=(c_char_p,c_int)
-libcrypto.RAND_bytes.argtypes=(c_char_p,c_int)
+
+libcrypto.RAND_add.argtypes = (c_char_p, c_int, c_double)
+libcrypto.RAND_seed.argtypes = (c_char_p, c_int)
+libcrypto.RAND_pseudo_bytes.argtypes = (c_char_p, c_int)
+libcrypto.RAND_bytes.argtypes = (c_char_p, c_int)