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less hard coding of cipher mode in libgcrypt backend

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This commit is contained in:
Simon Josefsson
2009-10-19 17:36:50 +02:00
parent 1e80194b97
commit 60d73d5663
2 changed files with 31 additions and 19 deletions
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20
src/libgcrypt.c
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@@ -524,16 +524,14 @@ _libssh2_cipher_init(_libssh2_cipher_ctx * h,
_libssh2_cipher_type(algo),
unsigned char *iv, unsigned char *secret, int encrypt)
{
int mode = 0, ret;
int keylen = gcry_cipher_get_algo_keylen(algo);
int ret;
int cipher = _libssh2_gcry_cipher (algo);
int mode = _libssh2_gcry_mode (algo);
int keylen = gcry_cipher_get_algo_keylen(cipher);
(void) encrypt;
if (algo != GCRY_CIPHER_ARCFOUR) {
mode = GCRY_CIPHER_MODE_CBC;
}
ret = gcry_cipher_open(h, algo, mode, 0);
ret = gcry_cipher_open(h, cipher, mode, 0);
if (ret) {
return -1;
}
@@ -544,8 +542,8 @@ _libssh2_cipher_init(_libssh2_cipher_ctx * h,
return -1;
}
if (algo != GCRY_CIPHER_ARCFOUR) {
int blklen = gcry_cipher_get_algo_blklen(algo);
if (mode != GCRY_CIPHER_MODE_STREAM) {
int blklen = gcry_cipher_get_algo_blklen(cipher);
ret = gcry_cipher_setiv(*h, iv, blklen);
if (ret) {
gcry_cipher_close(*h);
@@ -561,8 +559,10 @@ _libssh2_cipher_crypt(_libssh2_cipher_ctx * ctx,
_libssh2_cipher_type(algo),
int encrypt, unsigned char *block)
{
size_t blklen = gcry_cipher_get_algo_blklen(algo);
int cipher = _libssh2_gcry_cipher (algo);
size_t blklen = gcry_cipher_get_algo_blklen(cipher);
int ret;
if (blklen == 1) {
/* Hack for arcfour. */
blklen = 8;

30
src/libgcrypt.h
View File

@@ -1,5 +1,6 @@
/* Copyright (C) 2006, 2007, The Written Word, Inc.
* Copyright (C) 2008, Simon Josefsson
/*
* Copyright (C) 2008, 2009 Simon Josefsson
* Copyright (C) 2006, 2007, The Written Word, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms,
@@ -155,13 +156,24 @@ int _libssh2_dsa_sha1_sign(libssh2_dsa_ctx * dsactx,
#define _libssh2_cipher_type(name) int name
#define _libssh2_cipher_ctx gcry_cipher_hd_t
#define _libssh2_cipher_aes256 GCRY_CIPHER_AES256
#define _libssh2_cipher_aes192 GCRY_CIPHER_AES192
#define _libssh2_cipher_aes128 GCRY_CIPHER_AES128
#define _libssh2_cipher_blowfish GCRY_CIPHER_BLOWFISH
#define _libssh2_cipher_arcfour GCRY_CIPHER_ARCFOUR
#define _libssh2_cipher_cast5 GCRY_CIPHER_CAST5
#define _libssh2_cipher_3des GCRY_CIPHER_3DES
#define _libssh2_gcry_ciphermode(c,m) ((c << 8) | m)
#define _libssh2_gcry_cipher(c) (c >> 8)
#define _libssh2_gcry_mode(m) (m & 0xFF)
#define _libssh2_cipher_aes256 \
_libssh2_gcry_ciphermode(GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC)
#define _libssh2_cipher_aes192 \
_libssh2_gcry_ciphermode(GCRY_CIPHER_AES192, GCRY_CIPHER_MODE_CBC)
#define _libssh2_cipher_aes128 \
_libssh2_gcry_ciphermode(GCRY_CIPHER_AES128, GCRY_CIPHER_MODE_CBC)
#define _libssh2_cipher_blowfish \
_libssh2_gcry_ciphermode(GCRY_CIPHER_BLOWFISH, GCRY_CIPHER_MODE_CBC)
#define _libssh2_cipher_arcfour \
_libssh2_gcry_ciphermode(GCRY_CIPHER_ARCFOUR, GCRY_CIPHER_MODE_STREAM)
#define _libssh2_cipher_cast5 \
_libssh2_gcry_ciphermode(GCRY_CIPHER_CAST5, GCRY_CIPHER_MODE_CBC)
#define _libssh2_cipher_3des \
_libssh2_gcry_ciphermode(GCRY_CIPHER_3DES, GCRY_CIPHER_MODE_CBC)
int _libssh2_cipher_init(_libssh2_cipher_ctx * h,
_libssh2_cipher_type(algo),