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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [crypto/] [cipher.c] - Blame information for rev 1765

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/*
 * Cryptographic API.
 *
 * Cipher operations.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */
#include <linux/kernel.h>
#include <linux/crypto.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <asm/scatterlist.h>
#include "internal.h"
#include "scatterwalk.h"
 
typedef void (cryptfn_t)(void *, u8 *, const u8 *);
typedef void (procfn_t)(struct crypto_tfm *, u8 *,
                        u8*, cryptfn_t, int enc, void *, int);
 
static inline void xor_64(u8 *a, const u8 *b)
{
        ((u32 *)a)[0] ^= ((u32 *)b)[0];
        ((u32 *)a)[1] ^= ((u32 *)b)[1];
}
 
static inline void xor_128(u8 *a, const u8 *b)
{
        ((u32 *)a)[0] ^= ((u32 *)b)[0];
        ((u32 *)a)[1] ^= ((u32 *)b)[1];
        ((u32 *)a)[2] ^= ((u32 *)b)[2];
        ((u32 *)a)[3] ^= ((u32 *)b)[3];
}
 
 
/*
 * Generic encrypt/decrypt wrapper for ciphers, handles operations across
 * multiple page boundaries by using temporary blocks.  In user context,
 * the kernel is given a chance to schedule us once per block.
 */
static int crypt(struct crypto_tfm *tfm,
                 struct scatterlist *dst,
                 struct scatterlist *src,
                 unsigned int nbytes, cryptfn_t crfn,
                 procfn_t prfn, int enc, void *info)
{
        struct scatter_walk walk_in, walk_out;
        const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
        u8 tmp_src[nbytes > src->length ? bsize : 0];
        u8 tmp_dst[nbytes > dst->length ? bsize : 0];
 
        if (!nbytes)
                return 0;
 
        if (nbytes % bsize) {
                tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
                return -EINVAL;
        }
 
        scatterwalk_start(&walk_in, src);
        scatterwalk_start(&walk_out, dst);
 
        for(;;) {
                u8 *src_p, *dst_p;
 
                scatterwalk_map(&walk_in, 0);
                scatterwalk_map(&walk_out, 1);
                src_p = scatterwalk_whichbuf(&walk_in, bsize, tmp_src);
                dst_p = scatterwalk_whichbuf(&walk_out, bsize, tmp_dst);
 
                nbytes -= bsize;
 
                scatterwalk_copychunks(src_p, &walk_in, bsize, 0);
 
                prfn(tfm, dst_p, src_p, crfn, enc, info,
                     scatterwalk_samebuf(&walk_in, &walk_out,
                                         src_p, dst_p));
 
                scatterwalk_done(&walk_in, 0, nbytes);
 
                scatterwalk_copychunks(dst_p, &walk_out, bsize, 1);
                scatterwalk_done(&walk_out, 1, nbytes);
 
                if (!nbytes)
                        return 0;
 
                crypto_yield(tfm);
        }
}
 
static void cbc_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
                        cryptfn_t fn, int enc, void *info, int in_place)
{
        u8 *iv = info;
 
        /* Null encryption */
        if (!iv)
                return;
 
        if (enc) {
                tfm->crt_u.cipher.cit_xor_block(iv, src);
                fn(crypto_tfm_ctx(tfm), dst, iv);
                memcpy(iv, dst, crypto_tfm_alg_blocksize(tfm));
        } else {
                u8 stack[in_place ? crypto_tfm_alg_blocksize(tfm) : 0];
                u8 *buf = in_place ? stack : dst;
 
                fn(crypto_tfm_ctx(tfm), buf, src);
                tfm->crt_u.cipher.cit_xor_block(buf, iv);
                memcpy(iv, src, crypto_tfm_alg_blocksize(tfm));
                if (buf != dst)
                        memcpy(dst, buf, crypto_tfm_alg_blocksize(tfm));
        }
}
 
static void ecb_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
                        cryptfn_t fn, int enc, void *info, int in_place)
{
        fn(crypto_tfm_ctx(tfm), dst, src);
}
 
static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
        struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
 
        if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
                tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
                return -EINVAL;
        } else
                return cia->cia_setkey(crypto_tfm_ctx(tfm), key, keylen,
                                       &tfm->crt_flags);
}
 
static int ecb_encrypt(struct crypto_tfm *tfm,
                       struct scatterlist *dst,
                       struct scatterlist *src, unsigned int nbytes)
{
        return crypt(tfm, dst, src, nbytes,
                     tfm->__crt_alg->cra_cipher.cia_encrypt,
                     ecb_process, 1, NULL);
}
 
static int ecb_decrypt(struct crypto_tfm *tfm,
                       struct scatterlist *dst,
                       struct scatterlist *src,
                       unsigned int nbytes)
{
        return crypt(tfm, dst, src, nbytes,
                     tfm->__crt_alg->cra_cipher.cia_decrypt,
                     ecb_process, 1, NULL);
}
 
static int cbc_encrypt(struct crypto_tfm *tfm,
                       struct scatterlist *dst,
                       struct scatterlist *src,
                       unsigned int nbytes)
{
        return crypt(tfm, dst, src, nbytes,
                     tfm->__crt_alg->cra_cipher.cia_encrypt,
                     cbc_process, 1, tfm->crt_cipher.cit_iv);
}
 
static int cbc_encrypt_iv(struct crypto_tfm *tfm,
                          struct scatterlist *dst,
                          struct scatterlist *src,
                          unsigned int nbytes, u8 *iv)
{
        return crypt(tfm, dst, src, nbytes,
                     tfm->__crt_alg->cra_cipher.cia_encrypt,
                     cbc_process, 1, iv);
}
 
static int cbc_decrypt(struct crypto_tfm *tfm,
                       struct scatterlist *dst,
                       struct scatterlist *src,
                       unsigned int nbytes)
{
        return crypt(tfm, dst, src, nbytes,
                     tfm->__crt_alg->cra_cipher.cia_decrypt,
                     cbc_process, 0, tfm->crt_cipher.cit_iv);
}
 
static int cbc_decrypt_iv(struct crypto_tfm *tfm,
                          struct scatterlist *dst,
                          struct scatterlist *src,
                          unsigned int nbytes, u8 *iv)
{
        return crypt(tfm, dst, src, nbytes,
                     tfm->__crt_alg->cra_cipher.cia_decrypt,
                     cbc_process, 0, iv);
}
 
static int nocrypt(struct crypto_tfm *tfm,
                   struct scatterlist *dst,
                   struct scatterlist *src,
                   unsigned int nbytes)
{
        return -ENOSYS;
}
 
static int nocrypt_iv(struct crypto_tfm *tfm,
                      struct scatterlist *dst,
                      struct scatterlist *src,
                      unsigned int nbytes, u8 *iv)
{
        return -ENOSYS;
}
 
int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags)
{
        u32 mode = flags & CRYPTO_TFM_MODE_MASK;
 
        tfm->crt_cipher.cit_mode = mode ? mode : CRYPTO_TFM_MODE_ECB;
        if (flags & CRYPTO_TFM_REQ_WEAK_KEY)
                tfm->crt_flags = CRYPTO_TFM_REQ_WEAK_KEY;
 
        return 0;
}
 
int crypto_init_cipher_ops(struct crypto_tfm *tfm)
{
        int ret = 0;
        struct cipher_tfm *ops = &tfm->crt_cipher;
 
        ops->cit_setkey = setkey;
 
        switch (tfm->crt_cipher.cit_mode) {
        case CRYPTO_TFM_MODE_ECB:
                ops->cit_encrypt = ecb_encrypt;
                ops->cit_decrypt = ecb_decrypt;
                break;
 
        case CRYPTO_TFM_MODE_CBC:
                ops->cit_encrypt = cbc_encrypt;
                ops->cit_decrypt = cbc_decrypt;
                ops->cit_encrypt_iv = cbc_encrypt_iv;
                ops->cit_decrypt_iv = cbc_decrypt_iv;
                break;
 
        case CRYPTO_TFM_MODE_CFB:
                ops->cit_encrypt = nocrypt;
                ops->cit_decrypt = nocrypt;
                ops->cit_encrypt_iv = nocrypt_iv;
                ops->cit_decrypt_iv = nocrypt_iv;
                break;
 
        case CRYPTO_TFM_MODE_CTR:
                ops->cit_encrypt = nocrypt;
                ops->cit_decrypt = nocrypt;
                ops->cit_encrypt_iv = nocrypt_iv;
                ops->cit_decrypt_iv = nocrypt_iv;
                break;
 
        default:
                BUG();
        }
 
        if (ops->cit_mode == CRYPTO_TFM_MODE_CBC) {
 
                switch (crypto_tfm_alg_blocksize(tfm)) {
                case 8:
                        ops->cit_xor_block = xor_64;
                        break;
 
                case 16:
                        ops->cit_xor_block = xor_128;
                        break;
 
                default:
                        printk(KERN_WARNING "%s: block size %u not supported\n",
                               crypto_tfm_alg_name(tfm),
                               crypto_tfm_alg_blocksize(tfm));
                        ret = -EINVAL;
                        goto out;
                }
 
                ops->cit_ivsize = crypto_tfm_alg_blocksize(tfm);
                ops->cit_iv = kmalloc(ops->cit_ivsize, GFP_KERNEL);
                if (ops->cit_iv == NULL)
                        ret = -ENOMEM;
        }
 
out:
        return ret;
}
 
void crypto_exit_cipher_ops(struct crypto_tfm *tfm)
{
        if (tfm->crt_cipher.cit_iv)
                kfree(tfm->crt_cipher.cit_iv);
}

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [crypto/] [cipher.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* Cryptographic API.`
3			`*`
4			`* Cipher operations.`
5			`*`
6			`* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>`
7			`*`
8			`* This program is free software; you can redistribute it and/or modify it`
9			`* under the terms of the GNU General Public License as published by the Free`
10			`* Software Foundation; either version 2 of the License, or (at your option)`
11			`* any later version.`
12			`*`
13			`*/`
14			`#include <linux/kernel.h>`
15			`#include <linux/crypto.h>`
16			`#include <linux/errno.h>`
17			`#include <linux/mm.h>`
18			`#include <linux/slab.h>`
19			`#include <asm/scatterlist.h>`
20			`#include "internal.h"`
21			`#include "scatterwalk.h"`
22
23			`typedef void (cryptfn_t)(void , u8 , const u8 *);`
24			`typedef void (procfn_t)(struct crypto_tfm , u8 ,`
25			`u8, cryptfn_t, int enc, void , int);`
26
27			`static inline void xor_64(u8 a, const u8 b)`
28			`{`
29			`((u32 )a)[0] ^= ((u32 )b)[0];`
30			`((u32 )a)[1] ^= ((u32 )b)[1];`
31			`}`
32
33			`static inline void xor_128(u8 a, const u8 b)`
34			`{`
35			`((u32 )a)[0] ^= ((u32 )b)[0];`
36			`((u32 )a)[1] ^= ((u32 )b)[1];`
37			`((u32 )a)[2] ^= ((u32 )b)[2];`
38			`((u32 )a)[3] ^= ((u32 )b)[3];`
39			`}`
40
41
42			`/*`
43			`* Generic encrypt/decrypt wrapper for ciphers, handles operations across`
44			`* multiple page boundaries by using temporary blocks. In user context,`
45			`* the kernel is given a chance to schedule us once per block.`
46			`*/`
47			`static int crypt(struct crypto_tfm *tfm,`
48			`struct scatterlist *dst,`
49			`struct scatterlist *src,`
50			`unsigned int nbytes, cryptfn_t crfn,`
51			`procfn_t prfn, int enc, void *info)`
52			`{`
53			`struct scatter_walk walk_in, walk_out;`
54			`const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);`
55			`u8 tmp_src[nbytes > src->length ? bsize : 0];`
56			`u8 tmp_dst[nbytes > dst->length ? bsize : 0];`
57
58			`if (!nbytes)`
59			`return 0;`
60
61			`if (nbytes % bsize) {`
62			`tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_BLOCK_LEN;`
63			`return -EINVAL;`
64			`}`
65
66			`scatterwalk_start(&walk_in, src);`
67			`scatterwalk_start(&walk_out, dst);`
68
69			`for(;;) {`
70			`u8 src_p, dst_p;`
71
72			`scatterwalk_map(&walk_in, 0);`
73			`scatterwalk_map(&walk_out, 1);`
74			`src_p = scatterwalk_whichbuf(&walk_in, bsize, tmp_src);`
75			`dst_p = scatterwalk_whichbuf(&walk_out, bsize, tmp_dst);`
76
77			`nbytes -= bsize;`
78
79			`scatterwalk_copychunks(src_p, &walk_in, bsize, 0);`
80
81			`prfn(tfm, dst_p, src_p, crfn, enc, info,`
82			`scatterwalk_samebuf(&walk_in, &walk_out,`
83			`src_p, dst_p));`
84
85			`scatterwalk_done(&walk_in, 0, nbytes);`
86
87			`scatterwalk_copychunks(dst_p, &walk_out, bsize, 1);`
88			`scatterwalk_done(&walk_out, 1, nbytes);`
89
90			`if (!nbytes)`
91			`return 0;`
92
93			`crypto_yield(tfm);`
94			`}`
95			`}`
96
97			`static void cbc_process(struct crypto_tfm tfm, u8 dst, u8 *src,`
98			`cryptfn_t fn, int enc, void *info, int in_place)`
99			`{`
100			`u8 *iv = info;`
101
102			`/* Null encryption */`
103			`if (!iv)`
104			`return;`
105
106			`if (enc) {`
107			`tfm->crt_u.cipher.cit_xor_block(iv, src);`
108			`fn(crypto_tfm_ctx(tfm), dst, iv);`
109			`memcpy(iv, dst, crypto_tfm_alg_blocksize(tfm));`
110			`} else {`
111			`u8 stack[in_place ? crypto_tfm_alg_blocksize(tfm) : 0];`
112			`u8 *buf = in_place ? stack : dst;`
113
114			`fn(crypto_tfm_ctx(tfm), buf, src);`
115			`tfm->crt_u.cipher.cit_xor_block(buf, iv);`
116			`memcpy(iv, src, crypto_tfm_alg_blocksize(tfm));`
117			`if (buf != dst)`
118			`memcpy(dst, buf, crypto_tfm_alg_blocksize(tfm));`
119			`}`
120			`}`
121
122			`static void ecb_process(struct crypto_tfm tfm, u8 dst, u8 *src,`
123			`cryptfn_t fn, int enc, void *info, int in_place)`
124			`{`
125			`fn(crypto_tfm_ctx(tfm), dst, src);`
126			`}`
127
128			`static int setkey(struct crypto_tfm tfm, const u8 key, unsigned int keylen)`
129			`{`
130			`struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;`
131
132			`if (keylen < cia->cia_min_keysize \|\| keylen > cia->cia_max_keysize) {`
133			`tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;`
134			`return -EINVAL;`
135			`} else`
136			`return cia->cia_setkey(crypto_tfm_ctx(tfm), key, keylen,`
137			`&tfm->crt_flags);`
138			`}`
139
140			`static int ecb_encrypt(struct crypto_tfm *tfm,`
141			`struct scatterlist *dst,`
142			`struct scatterlist *src, unsigned int nbytes)`
143			`{`
144			`return crypt(tfm, dst, src, nbytes,`
145			`tfm->__crt_alg->cra_cipher.cia_encrypt,`
146			`ecb_process, 1, NULL);`
147			`}`
148
149			`static int ecb_decrypt(struct crypto_tfm *tfm,`
150			`struct scatterlist *dst,`
151			`struct scatterlist *src,`
152			`unsigned int nbytes)`
153			`{`
154			`return crypt(tfm, dst, src, nbytes,`
155			`tfm->__crt_alg->cra_cipher.cia_decrypt,`
156			`ecb_process, 1, NULL);`
157			`}`
158
159			`static int cbc_encrypt(struct crypto_tfm *tfm,`
160			`struct scatterlist *dst,`
161			`struct scatterlist *src,`
162			`unsigned int nbytes)`
163			`{`
164			`return crypt(tfm, dst, src, nbytes,`
165			`tfm->__crt_alg->cra_cipher.cia_encrypt,`
166			`cbc_process, 1, tfm->crt_cipher.cit_iv);`
167			`}`
168
169			`static int cbc_encrypt_iv(struct crypto_tfm *tfm,`
170			`struct scatterlist *dst,`
171			`struct scatterlist *src,`
172			`unsigned int nbytes, u8 *iv)`
173			`{`
174			`return crypt(tfm, dst, src, nbytes,`
175			`tfm->__crt_alg->cra_cipher.cia_encrypt,`
176			`cbc_process, 1, iv);`
177			`}`
178
179			`static int cbc_decrypt(struct crypto_tfm *tfm,`
180			`struct scatterlist *dst,`
181			`struct scatterlist *src,`
182			`unsigned int nbytes)`
183			`{`
184			`return crypt(tfm, dst, src, nbytes,`
185			`tfm->__crt_alg->cra_cipher.cia_decrypt,`
186			`cbc_process, 0, tfm->crt_cipher.cit_iv);`
187			`}`
188
189			`static int cbc_decrypt_iv(struct crypto_tfm *tfm,`
190			`struct scatterlist *dst,`
191			`struct scatterlist *src,`
192			`unsigned int nbytes, u8 *iv)`
193			`{`
194			`return crypt(tfm, dst, src, nbytes,`
195			`tfm->__crt_alg->cra_cipher.cia_decrypt,`
196			`cbc_process, 0, iv);`
197			`}`
198
199			`static int nocrypt(struct crypto_tfm *tfm,`
200			`struct scatterlist *dst,`
201			`struct scatterlist *src,`
202			`unsigned int nbytes)`
203			`{`
204			`return -ENOSYS;`
205			`}`
206
207			`static int nocrypt_iv(struct crypto_tfm *tfm,`
208			`struct scatterlist *dst,`
209			`struct scatterlist *src,`
210			`unsigned int nbytes, u8 *iv)`
211			`{`
212			`return -ENOSYS;`
213			`}`
214
215			`int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags)`
216			`{`
217			`u32 mode = flags & CRYPTO_TFM_MODE_MASK;`
218
219			`tfm->crt_cipher.cit_mode = mode ? mode : CRYPTO_TFM_MODE_ECB;`
220			`if (flags & CRYPTO_TFM_REQ_WEAK_KEY)`
221			`tfm->crt_flags = CRYPTO_TFM_REQ_WEAK_KEY;`
222
223			`return 0;`
224			`}`
225
226			`int crypto_init_cipher_ops(struct crypto_tfm *tfm)`
227			`{`
228			`int ret = 0;`
229			`struct cipher_tfm *ops = &tfm->crt_cipher;`
230
231			`ops->cit_setkey = setkey;`
232
233			`switch (tfm->crt_cipher.cit_mode) {`
234			`case CRYPTO_TFM_MODE_ECB:`
235			`ops->cit_encrypt = ecb_encrypt;`
236			`ops->cit_decrypt = ecb_decrypt;`
237			`break;`
238
239			`case CRYPTO_TFM_MODE_CBC:`
240			`ops->cit_encrypt = cbc_encrypt;`
241			`ops->cit_decrypt = cbc_decrypt;`
242			`ops->cit_encrypt_iv = cbc_encrypt_iv;`
243			`ops->cit_decrypt_iv = cbc_decrypt_iv;`
244			`break;`
245
246			`case CRYPTO_TFM_MODE_CFB:`
247			`ops->cit_encrypt = nocrypt;`
248			`ops->cit_decrypt = nocrypt;`
249			`ops->cit_encrypt_iv = nocrypt_iv;`
250			`ops->cit_decrypt_iv = nocrypt_iv;`
251			`break;`
252
253			`case CRYPTO_TFM_MODE_CTR:`
254			`ops->cit_encrypt = nocrypt;`
255			`ops->cit_decrypt = nocrypt;`
256			`ops->cit_encrypt_iv = nocrypt_iv;`
257			`ops->cit_decrypt_iv = nocrypt_iv;`
258			`break;`
259
260			`default:`
261			`BUG();`
262			`}`
263
264			`if (ops->cit_mode == CRYPTO_TFM_MODE_CBC) {`
265
266			`switch (crypto_tfm_alg_blocksize(tfm)) {`
267			`case 8:`
268			`ops->cit_xor_block = xor_64;`
269			`break;`
270
271			`case 16:`
272			`ops->cit_xor_block = xor_128;`
273			`break;`
274
275			`default:`
276			`printk(KERN_WARNING "%s: block size %u not supported\n",`
277			`crypto_tfm_alg_name(tfm),`
278			`crypto_tfm_alg_blocksize(tfm));`
279			`ret = -EINVAL;`
280			`goto out;`
281			`}`
282
283			`ops->cit_ivsize = crypto_tfm_alg_blocksize(tfm);`
284			`ops->cit_iv = kmalloc(ops->cit_ivsize, GFP_KERNEL);`
285			`if (ops->cit_iv == NULL)`
286			`ret = -ENOMEM;`
287			`}`
288
289			`out:`
290			`return ret;`
291			`}`
292
293			`void crypto_exit_cipher_ops(struct crypto_tfm *tfm)`
294			`{`
295			`if (tfm->crt_cipher.cit_iv)`
296			`kfree(tfm->crt_cipher.cit_iv);`
297			`}`