ima_crypto.c (2d8ad8719591fa803b0d589ed057fa46f49b7155) ima_crypto.c (2fe5d6def1672ae6635dd71867bf36dcfaa7434b)
1/*
2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
3 *
4 * Authors:
5 * Mimi Zohar <zohar@us.ibm.com>
6 * Kylene Hall <kjhall@us.ibm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify

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43 * Calculate the MD5/SHA1 file digest
44 */
45int ima_calc_hash(struct file *file, char *digest)
46{
47 struct hash_desc desc;
48 struct scatterlist sg[1];
49 loff_t i_size, offset = 0;
50 char *rbuf;
1/*
2 * Copyright (C) 2005,2006,2007,2008 IBM Corporation
3 *
4 * Authors:
5 * Mimi Zohar <zohar@us.ibm.com>
6 * Kylene Hall <kjhall@us.ibm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify

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43 * Calculate the MD5/SHA1 file digest
44 */
45int ima_calc_hash(struct file *file, char *digest)
46{
47 struct hash_desc desc;
48 struct scatterlist sg[1];
49 loff_t i_size, offset = 0;
50 char *rbuf;
51 int rc;
51 int rc, read = 0;
52
53 rc = init_desc(&desc);
54 if (rc != 0)
55 return rc;
56
57 rbuf = kzalloc(PAGE_SIZE, GFP_KERNEL);
58 if (!rbuf) {
59 rc = -ENOMEM;
60 goto out;
61 }
52
53 rc = init_desc(&desc);
54 if (rc != 0)
55 return rc;
56
57 rbuf = kzalloc(PAGE_SIZE, GFP_KERNEL);
58 if (!rbuf) {
59 rc = -ENOMEM;
60 goto out;
61 }
62 if (!(file->f_mode & FMODE_READ)) {
63 file->f_mode |= FMODE_READ;
64 read = 1;
65 }
62 i_size = i_size_read(file->f_dentry->d_inode);
63 while (offset < i_size) {
64 int rbuf_len;
65
66 rbuf_len = kernel_read(file, offset, rbuf, PAGE_SIZE);
67 if (rbuf_len < 0) {
68 rc = rbuf_len;
69 break;

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75
76 rc = crypto_hash_update(&desc, sg, rbuf_len);
77 if (rc)
78 break;
79 }
80 kfree(rbuf);
81 if (!rc)
82 rc = crypto_hash_final(&desc, digest);
66 i_size = i_size_read(file->f_dentry->d_inode);
67 while (offset < i_size) {
68 int rbuf_len;
69
70 rbuf_len = kernel_read(file, offset, rbuf, PAGE_SIZE);
71 if (rbuf_len < 0) {
72 rc = rbuf_len;
73 break;

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79
80 rc = crypto_hash_update(&desc, sg, rbuf_len);
81 if (rc)
82 break;
83 }
84 kfree(rbuf);
85 if (!rc)
86 rc = crypto_hash_final(&desc, digest);
87 if (read)
88 file->f_mode &= ~FMODE_READ;
83out:
84 crypto_free_hash(desc.tfm);
85 return rc;
86}
87
88/*
89 * Calculate the hash of a given template
90 */

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90 crypto_free_hash(desc.tfm);
91 return rc;
92}
93
94/*
95 * Calculate the hash of a given template
96 */

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