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Code Issues Releases Wiki Activity

crypto.pyx: cosmetic changes, added comments

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This commit is contained in:
Thomas Waldmann 2015-03-03 20:11:28 +01:00
parent 6c7c2e2e40
commit 550320535c
1 changed files with 15 additions and 13 deletions
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22
attic/crypto.pyx
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@ -30,14 +30,12 @@ cdef extern from "openssl/evp.h":
const unsigned char *key, const unsigned char *iv) const unsigned char *key, const unsigned char *iv)
int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
const unsigned char *key, const unsigned char *iv) const unsigned char *key, const unsigned char *iv)
int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
int *outl, const unsigned char *in_, int inl) const unsigned char *in_, int inl)
int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
int *outl, const unsigned char *in_, int inl) const unsigned char *in_, int inl)
int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
int *outl) int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out,
int *outl)
int PKCS5_PBKDF2_HMAC(const char *password, int passwordlen, int PKCS5_PBKDF2_HMAC(const char *password, int passwordlen,
const unsigned char *salt, int saltlen, int iter, const unsigned char *salt, int saltlen, int iter,
@ -55,7 +53,8 @@ long_to_bytes = lambda x: _long.pack(x)
def num_aes_blocks(length): def num_aes_blocks(length):
"""Return the number of AES blocks required to encrypt/decrypt *length* bytes of data """Return the number of AES blocks required to encrypt/decrypt *length* bytes of data.
Note: this is only correct for modes without padding, like AES-CTR.
""" """
return (length + 15) // 16 return (length + 15) // 16
@ -160,7 +159,10 @@ cdef class AES:
if not EVP_DecryptUpdate(&self.ctx, out, &outl, data, inl): if not EVP_DecryptUpdate(&self.ctx, out, &outl, data, inl):
raise Exception('EVP_DecryptUpdate failed') raise Exception('EVP_DecryptUpdate failed')
ptl = outl ptl = outl
if EVP_DecryptFinal_ex(&self.ctx, out+outl, &outl) <= 0: if EVP_DecryptFinal_ex(&self.ctx, out+ptl, &outl) <= 0:
# this error check is very important for modes with padding or
# authentication. for them, a failure here means corrupted data.
# CTR mode does not use padding nor authentication.
raise Exception('EVP_DecryptFinal failed') raise Exception('EVP_DecryptFinal failed')
ptl += outl ptl += outl
return out[:ptl] return out[:ptl]