1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2019,Softathome
4 */
5 #include "mkimage.h"
6 #include <stdio.h>
7 #include <string.h>
8 #include <image.h>
9 #include <time.h>
10 #include <openssl/bn.h>
11 #include <openssl/rsa.h>
12 #include <openssl/pem.h>
13 #include <openssl/err.h>
14 #include <openssl/ssl.h>
15 #include <openssl/evp.h>
16 #include <openssl/engine.h>
17 #include <uboot_aes.h>
18
19 #if OPENSSL_VERSION_NUMBER >= 0x10000000L
20 #define HAVE_ERR_REMOVE_THREAD_STATE
21 #endif
22
image_aes_encrypt(struct image_cipher_info * info,unsigned char * data,int size,unsigned char ** cipher,int * cipher_len)23 int image_aes_encrypt(struct image_cipher_info *info,
24 unsigned char *data, int size,
25 unsigned char **cipher, int *cipher_len)
26 {
27 EVP_CIPHER_CTX *ctx;
28 unsigned char *buf = NULL;
29 int buf_len, len, ret = 0;
30
31 /* create and initialise the context */
32 ctx = EVP_CIPHER_CTX_new();
33 if (!ctx) {
34 printf("Can't create context\n");
35 return -1;
36 }
37
38 /* allocate a buffer for the result */
39 buf = malloc(size + AES_BLOCK_LENGTH);
40 if (!buf) {
41 printf("Can't allocate memory to encrypt\n");
42 ret = -1;
43 goto out;
44 }
45
46 if (EVP_EncryptInit_ex(ctx, info->cipher->calculate_type(),
47 NULL, info->key, info->iv) != 1) {
48 printf("Can't init encryption\n");
49 ret = -1;
50 goto out;
51 }
52
53 if (EVP_EncryptUpdate(ctx, buf, &len, data, size) != 1) {
54 printf("Can't encrypt data\n");
55 ret = -1;
56 goto out;
57 }
58
59 buf_len = len;
60
61 if (EVP_EncryptFinal_ex(ctx, buf + len, &len) != 1) {
62 printf("Can't finalise the encryption\n");
63 ret = -1;
64 goto out;
65 }
66
67 buf_len += len;
68
69 *cipher = buf;
70 *cipher_len = buf_len;
71
72 out:
73 EVP_CIPHER_CTX_free(ctx);
74 return ret;
75 }
76
image_aes_add_cipher_data(struct image_cipher_info * info,void * keydest)77 int image_aes_add_cipher_data(struct image_cipher_info *info, void *keydest)
78 {
79 int parent, node;
80 char name[128];
81 int ret = 0;
82
83 /* Either create or overwrite the named cipher node */
84 parent = fdt_subnode_offset(keydest, 0, FIT_CIPHER_NODENAME);
85 if (parent == -FDT_ERR_NOTFOUND) {
86 parent = fdt_add_subnode(keydest, 0, FIT_CIPHER_NODENAME);
87 if (parent < 0) {
88 ret = parent;
89 if (ret != -FDT_ERR_NOSPACE) {
90 fprintf(stderr,
91 "Couldn't create cipher node: %s\n",
92 fdt_strerror(parent));
93 }
94 }
95 }
96 if (ret)
97 goto done;
98
99 /* Either create or overwrite the named key node */
100 snprintf(name, sizeof(name), "key-%s-%s-%s",
101 info->name, info->keyname, info->ivname);
102 node = fdt_subnode_offset(keydest, parent, name);
103 if (node == -FDT_ERR_NOTFOUND) {
104 node = fdt_add_subnode(keydest, parent, name);
105 if (node < 0) {
106 ret = node;
107 if (ret != -FDT_ERR_NOSPACE) {
108 fprintf(stderr,
109 "Could not create key subnode: %s\n",
110 fdt_strerror(node));
111 }
112 }
113 } else if (node < 0) {
114 fprintf(stderr, "Cannot select keys parent: %s\n",
115 fdt_strerror(node));
116 ret = node;
117 }
118
119 if (!ret)
120 ret = fdt_setprop(keydest, node, "iv",
121 info->iv, info->cipher->iv_len);
122
123 if (!ret)
124 ret = fdt_setprop(keydest, node, "key",
125 info->key, info->cipher->key_len);
126
127 if (!ret)
128 ret = fdt_setprop_u32(keydest, node, "key-len",
129 info->cipher->key_len);
130
131 done:
132 if (ret)
133 ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
134
135 return ret;
136 }
137