Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 341 insertions, 0 deletions

diff --git a/crypto/cipher.c b/crypto/cipher.c
new file mode 100644
index 000000000000..f434ce7c2d0b
--- /dev/null
+++ b/crypto/cipher.c
@@ -0,0 +1,341 @@
+/*
+ * 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/compiler.h>
+#include <linux/kernel.h>
+#include <linux/crypto.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/string.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, void *);
+
+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];
+}
+ 
+static inline void *prepare_src(struct scatter_walk *walk, int bsize,
+                                void *tmp, int in_place)
+{
+        void *src = walk->data;
+        int n = bsize;
+
+        if (unlikely(scatterwalk_across_pages(walk, bsize))) {
+                src = tmp;
+                n = scatterwalk_copychunks(src, walk, bsize, 0);
+        }
+        scatterwalk_advance(walk, n);
+        return src;
+}
+
+static inline void *prepare_dst(struct scatter_walk *walk, int bsize,
+                                void *tmp, int in_place)
+{
+        void *dst = walk->data;
+
+        if (unlikely(scatterwalk_across_pages(walk, bsize)) || in_place)
+                dst = tmp;
+        return dst;
+}
+
+static inline void complete_src(struct scatter_walk *walk, int bsize,
+                                void *src, int in_place)
+{
+}
+
+static inline void complete_dst(struct scatter_walk *walk, int bsize,
+                                void *dst, int in_place)
+{
+        int n = bsize;
+
+        if (unlikely(scatterwalk_across_pages(walk, bsize)))
+                n = scatterwalk_copychunks(dst, walk, bsize, 1);
+        else if (in_place)
+                memcpy(walk->data, dst, bsize);
+        scatterwalk_advance(walk, n);
+}
+
+/* 
+ * 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, void *info)
+{
+        struct scatter_walk walk_in, walk_out;
+        const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
+        u8 tmp_src[bsize];
+        u8 tmp_dst[bsize];
+
+        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;
+                int in_place;
+
+                scatterwalk_map(&walk_in, 0);
+                scatterwalk_map(&walk_out, 1);
+
+                in_place = scatterwalk_samebuf(&walk_in, &walk_out);
+
+                do {
+                        src_p = prepare_src(&walk_in, bsize, tmp_src,
+                                            in_place);
+                        dst_p = prepare_dst(&walk_out, bsize, tmp_dst,
+                                            in_place);
+
+                        prfn(tfm, dst_p, src_p, crfn, info);
+
+                        complete_src(&walk_in, bsize, src_p, in_place);
+                        complete_dst(&walk_out, bsize, dst_p, in_place);
+
+                        nbytes -= bsize;
+                } while (nbytes &&
+                         !scatterwalk_across_pages(&walk_in, bsize) &&
+                         !scatterwalk_across_pages(&walk_out, bsize));
+
+                scatterwalk_done(&walk_in, 0, nbytes);
+                scatterwalk_done(&walk_out, 1, nbytes);
+
+                if (!nbytes)
+                        return 0;
+
+                crypto_yield(tfm);
+        }
+}
+
+static void cbc_process_encrypt(struct crypto_tfm *tfm, u8 *dst, u8 *src,
+                                cryptfn_t fn, void *info)
+{
+        u8 *iv = info;
+
+        tfm->crt_u.cipher.cit_xor_block(iv, src);
+        fn(crypto_tfm_ctx(tfm), dst, iv);
+        memcpy(iv, dst, crypto_tfm_alg_blocksize(tfm));
+}
+
+static void cbc_process_decrypt(struct crypto_tfm *tfm, u8 *dst, u8 *src,
+                                cryptfn_t fn, void *info)
+{
+        u8 *iv = info;
+
+        fn(crypto_tfm_ctx(tfm), dst, src);
+        tfm->crt_u.cipher.cit_xor_block(dst, iv);
+        memcpy(iv, src, crypto_tfm_alg_blocksize(tfm));
+}
+
+static void ecb_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
+                        cryptfn_t fn, void *info)
+{
+        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, 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, 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_encrypt, 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_encrypt, 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_decrypt, 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_decrypt, 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);
+}