-from ctypes import byref,c_int,c_long, c_longlong, create_string_buffer
+from ctypes import c_char_p,c_void_p,byref,c_int,c_long, c_longlong, create_string_buffer,CFUNCTYPE,POINTER
from ctypescrypto import libcrypto
-from ctypescrypto.exception import LibCryptoErrors,clear_err_stack
+from ctypescrypto.exception import LibCryptoError,clear_err_stack
from ctypescrypto.bio import Membio
class PKeyError(LibCryptoError):
pass
+CALLBACK_FUNC=CFUNCTYPE(c_int,c_char_p,c_int,c_int,c_char_p)
+def password_callback(buf,length,rwflag,u):
+ cnt=len(u)
+ if length<cnt:
+ cnt=length
+ memmove(buf,u,cnt)
+ return cnt
+
+_cb=CALLBACK_FUNC(password_callback)
+
class PKey:
- def __init__(self,ptr,cansign)
- self.key=ptr:
- self.cansign=cansign
+ def __init__(self,ptr=None,privkey=None,pubkey=None,format="PEM",cansign=False,password=None):
+ if not ptr is None:
+ self.key=ptr
+ self.cansign=cansign
+ if not privkey is None or not pubkey is None:
+ raise TypeError("Just one of pubkey or privkey can be specified")
+ elif not privkey is None:
+ if not pubkey is None:
+ raise TypeError("Just one of pubkey or privkey can be specified")
+ b=Membio(privkey)
+ self.cansign=True
+ if format == "PEM":
+ self.key=libcrypto.PEM_read_bio_PrivateKey(b.bio,None,_cb,c_char_p(password))
+ else:
+ self.key=libcrypto.d2i_PrivateKey_bio(b.bio,None)
+ if self.key is None:
+ raise PKeyError("error parsing private key")
+ elif not pubkey is None:
+ b=Membio(pubkey)
+ self.cansign=False
+ if format == "PEM":
+ self.key=libcrypto.PEM_read_bio_PUBKEY(b.bio,None,_cb,None)
+ else:
+ self.key=libcrypto.d2i_PUBKEY_bio(b.bio,None)
+ if self.key is None:
+ raise PKeyError("error parsing public key")
+ else:
+ raise TypeError("Neither public, nor private key is specified")
+
+
def __del__(self):
libcrypto.EVP_PKEY_free(self.key)
def __eq__(self,other):
def __str__(self):
""" printable representation of public key """
b=Membio()
- libcrypto.EVP_PKEY_print_public(b.bio,self.key,0,NULL)
+ libcrypto.EVP_PKEY_print_public(b.bio,self.key,0,None)
return str(b)
- def privpem(s,password=None):
- """ Class method for load from the pem string of private key """
- b=Membio(s)
- return PKey(libcrypto.PEM_read_bio_PrivateKey(b.bio,NULL,cb,c_char_p(password))
- def privder(s):
- """ Class method for load from the binary ASN1 structure of private key """
- b=Membio(s)
- return PKey(libcrypto.d2i_PrivateKey_bio(b.bio,NULL),True)
- def pubpem(s):
- """ Class method for load from public key pem string"""
- b=Membio(s)
- return PKey(libcrypto.PEM_read_bio_PUBKEY(b.bio,NULL,cb,c_char_p(password)),False)
- def pubder(s):
- """ Class method for load from the binary ASN1 structure """
- b=Membio(s)
- return PKey(libcrypto.d2i_PUBKEY_bio(b.bio,NULL),False)
def sign(self,digest,**kwargs):
"""
Signs given digest and retirns signature
"""
ctx=libcrypto.EVP_PKEY_CTX_new(self.key,None)
if ctx is None:
- raise PkeyError("Initailizing sign context")
+ raise PKeyError("Initailizing sign context")
if libcrypto.EVP_PKEY_sign_init(ctx)<1:
- raise PkeyError("sign_init")
+ raise PKeyError("sign_init")
for oper in kwargs:
rv=libcrypto.EVP_PKEY_CTX_ctrl_str(ctx,oper,kwargs[oper])
- if rw=-2:
+ if rv==-2:
raise PKeyError("Parameter %s is not supported by key"%(oper))
if rv<1:
raise PKeyError("Error setting parameter %s"(oper))
# Find out signature size
siglen=c_long(0)
if libcrypto.EVP_PKEY_sign(ctx,None,byref(siglen),digest,len(digest))<1:
- raise PkeyError("signing")
+ raise PKeyError("signing")
sig=create_string_buffer(siglen.value)
- libcrypto.EVP_PKEY_sign(ctx,sig,byref(signlen),digest,len(digest)
+ libcrypto.EVP_PKEY_sign(ctx,sig,byref(siglen),digest,len(digest))
libcrypto.EVP_PKEY_CTX_free(ctx)
- return sig.value[:siglen.value]
+ return sig.raw[:siglen.value]
def verify(self,digest,signature,**kwargs):
"""
"""
ctx=libcrypto.EVP_PKEY_CTX_new(self.key,None)
if ctx is None:
- raise PkeyError("Initailizing verify context")
+ raise PKeyError("Initailizing verify context")
if libcrypto.EVP_PKEY_verify_init(ctx)<1:
- raise PkeyError("verify_init")
+ raise PKeyError("verify_init")
for oper in kwargs:
rv=libcrypto.EVP_PKEY_CTX_ctrl_str(ctx,oper,kwargs[oper])
- if rw=-2:
+ if rv==-2:
raise PKeyError("Parameter %s is not supported by key"%(oper))
if rv<1:
raise PKeyError("Error setting parameter %s"(oper))
rv=libcrypto.EVP_PKEY_verify(ctx,signature,len(signature),digest,len(digest))
if rv<0:
raise PKeyError("Signature verification")
- libcrypto=EVP_PKEY_CTX_free(ctx)
+ libcrypto.EVP_PKEY_CTX_free(ctx)
return rv>0
+ def derive(self,peerkey,**kwargs):
+ """
+ Derives shared key (DH,ECDH,VKO 34.10). Requires
+ private key available
+
+ @param peerkey - other key (may be public only)
+
+ Keyword parameters are algorithm-specific
+ """
+ ctx=libcrypto.EVP_PKEY_CTX_new(self.key,None)
+ if ctx is None:
+ raise PKeyError("Initailizing derive context")
+ if libcrypto.EVP_PKEY_derive_init(ctx)<1:
+ raise PKeyError("derive_init")
+ for oper in kwargs:
+ rv=libcrypto.EVP_PKEY_CTX_ctrl_str(ctx,oper,kwargs[oper])
+ if rv==-2:
+ raise PKeyError("Parameter %s is not supported by key"%(oper))
+ if rv<1:
+ raise PKeyError("Error setting parameter %s"(oper))
+ if libcrypto.EVP_PKEY_derive_set_peer(ctx,peerkey.key)<=0:
+ raise PKeyError("Cannot set peer key")
+ keylen=c_long(0)
+ if libcrypto.EVP_PKEY_derive(ctx,None,byref(keylen))<=0:
+ raise PKeyError("computing shared key length")
+ buf=create_string_buffer(keylen)
+ if libcrypto.EVP_PKEY_derive(ctx,buf,byref(keylen))<=0:
+ raise PKeyError("computing actual shared key")
+ libcrypto.EVP_PKEY_CTX_free(ctx)
+ return buf.raw[:keylen]
def generate(algorithm,**kwargs):
"""
Generates new private-public key pair for given algorithm
raise PKeyError("keygen_init")
for oper in kwargs:
rv=libcrypto.EVP_PKEY_CTX_ctrl_str(ctx,oper,kwargs[oper])
- if rw=-2:
+ if rw==-2:
raise PKeyError("Parameter %s is not supported by key"%(oper))
if rv<1:
raise PKeyError("Error setting parameter %s"(oper))
if libcrypto.EVP_PKEY_keygen(ctx,byref(key))<=0:
raise PKeyError("Error generating key")
libcrypto.EVP_PKEY_CTX_free(ctx)
- return PKey(key,True)
-
+ return PKey(ptr=key,cansign=True)
+
+# Declare function prototypes
+libcrypto.EVP_PKEY_cmp.argtypes=(c_void_p,c_void_p)
+libcrypto.PEM_read_bio_PrivateKey.restype=c_void_p
+libcrypto.PEM_read_bio_PrivateKey.argtypes=(c_void_p,POINTER(c_void_p),CALLBACK_FUNC,c_char_p)
+libcrypto.d2i_PKCS8PrivateKey_bio.restype=c_void_p
+libcrypto.d2i_PKCS8PrivateKey_bio.argtypes=(c_void_p,POINTER(c_void_p),CALLBACK_FUNC,c_char_p)
+libcrypto.PEM_read_bio_PUBKEY.restype=c_void_p
+libcrypto.PEM_read_bio_PUBKEY.argtypes=(c_void_p,POINTER(c_void_p),CALLBACK_FUNC,c_char_p)
+libcrypto.d2i_PUBKEY_bio.restype=c_void_p
+libcrypto.d2i_PUBKEY_bio.argtypes=(c_void_p,c_void_p)
+libcrypto.EVP_PKEY_print_public.argtypes=(c_void_p,c_void_p,c_int,c_void_p)
+
projects / oss / ctypescrypto.git / blobdiff