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algorithms_pkcs1_encoding.c Go to the documentation of this file.
1 #include <mhash.h> 2 #include "tc_internal.h" 3 4 const uint8_t MD2_PKCS_ID[] = {
5 0x30, 0x20, 0x30, 0x0C, 0x06, 0x08, 0x2A, 0x86, 0x48, 0x86,
6 0xF7, 0x0D, 0x02, 0x02, 0x05, 0x00, 0x04, 0x10 };
7 8 const uint8_t MD5_PKCS_ID[] = {
9 0x30, 0x20, 0x30, 0x0C, 0x06, 0x08, 0x2A, 0x86, 0x48, 0x86,
10 0xF7, 0x0D, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10 };
11 12 const uint8_t RIPEMD_128_PKCS_ID[] = {
13 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x24, 0x03, 0x02,
14 0x02, 0x05, 0x00, 0x04, 0x14 };
15 16 const uint8_t RIPEMD_160_PKCS_ID[] = {
17 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x24, 0x03, 0x02,
18 0x01, 0x05, 0x00, 0x04, 0x14 };
19 20 const uint8_t SHA_160_PKCS_ID[] = {
21 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x0E, 0x03, 0x02,
22 0x1A, 0x05, 0x00, 0x04, 0x14 };
23 24 const uint8_t SHA_224_PKCS_ID[] = {
25 0x30, 0x2D, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01,
26 0x65, 0x03, 0x04, 0x02, 0x04, 0x05, 0x00, 0x04, 0x1C };
27 28 const uint8_t SHA_256_PKCS_ID[] = {
29 0x30, 0x31, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01,
30 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20 };
31 32 const uint8_t SHA_384_PKCS_ID[] = {
33 0x30, 0x41, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01,
34 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30 };
35 36 const uint8_t SHA_512_PKCS_ID[] = {
37 0x30, 0x51, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01,
38 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40 };
39 40 const uint8_t TIGER_PKCS_ID[] = {
41 0x30, 0x29, 0x30, 0x0D, 0x06, 0x09, 0x2B, 0x06, 0x01, 0x04,
42 0x01, 0xDA, 0x47, 0x0C, 0x02, 0x05, 0x00, 0x04, 0x18 };
43 44 static inline void get_hash_properties(
const uint8_t **
id,
int * id_len,
int * digest_len, tc_hash_type_t hash_type) {
45 switch(hash_type) {
46 case TC_SHA256:
47 *id_len =
sizeof(SHA_256_PKCS_ID);
48 *digest_len = 256/8;
49 *
id = SHA_256_PKCS_ID;
50 break;
51 case TC_NONE:
52 *id_len = 0;
53 *digest_len = 0;
54 *
id = NULL;
55 break;
56 default:
57 abort();
58 }
59 }
60 61 static void tc_pkcs1_encoding(bytes_t * out, bytes_t * digest, tc_hash_type_t hash_type) {
62 int k = out->data_len;
63 const uint8_t *hash_desc;
64 int hash_desc_len, digest_len;
65 66 get_hash_properties(&hash_desc, &hash_desc_len, &digest_len, hash_type);
67 68 assert(digest->data_len <= digest_len);
69 70 int D_len = digest_len + hash_desc_len;
71 int P_len = k - 3 - D_len;
72 73 uint8_t *p = out->data;
74 75 /* PKCS1 padding */ 76 *p++ = 0x00;
77 *p++ = 0x01;
78 memset(p, 0xFF, P_len);
79 p += P_len;
80 *p++ = 0x00;
81 82 if (hash_desc != NULL) {
// ASN.1 83 memcpy(p, hash_desc, hash_desc_len);
84 }
85 86 p += hash_desc_len;
87 88 memcpy(p, digest->data, digest->data_len);
89 }
90 91 bytes_t * tc_prepare_document(
const bytes_t * doc, tc_hash_type_t hash_type,
const key_metainfo_t * metainfo) {
92 size_t data_len = metainfo->public_key->n->data_len;
93 94 bytes_t * out = tc_init_bytes(malloc(data_len), data_len);
95 bytes_t digest;
96 switch(hash_type) {
97 case TC_SHA256:
98 {
99 uint8_t hash[32];
100 MHASH sha = mhash_init(MHASH_SHA256);
101 mhash(sha, doc->data, doc->data_len);
102 mhash_deinit(sha, hash);
103 104 digest.data = hash;
105 digest.data_len = 32;
106 }
107 break;
108 case TC_NONE:
109 {
110 digest.data = doc->data;
111 digest.data_len = doc->data_len;
112 }
113 break;
114 default:
115 abort();
116 };
117 118 assert(digest.data_len <= data_len);
119 tc_pkcs1_encoding(out, &digest, hash_type);
120 return out;
121 }tc_prepare_documentbytes_t * tc_prepare_document(const bytes_t *doc, tc_hash_type_t hash_type, const key_metainfo_t *metainfo)Definition: algorithms_pkcs1_encoding.c:91 key_metainfo::public_keypublic_key_t * public_keyDefinition: tc_internal.h:14 RIPEMD_128_PKCS_IDconst uint8_t RIPEMD_128_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:12 bytesStructure that's stores a pointer that points to data_len bytes. Definition: tc.h:14 public_key::nbytes_t * nDefinition: tc_internal.h:9 key_metainfoStructure that represents the data about a key share, including its public key. Definition: tc_internal.h:13 TC_SHA256Definition: tc.h:48 tc_internal.h MD2_PKCS_IDconst uint8_t MD2_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:4 TC_NONEDefinition: tc.h:49 RIPEMD_160_PKCS_IDconst uint8_t RIPEMD_160_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:16 TIGER_PKCS_IDconst uint8_t TIGER_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:40 SHA_160_PKCS_IDconst uint8_t SHA_160_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:20 SHA_512_PKCS_IDconst uint8_t SHA_512_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:36 MD5_PKCS_IDconst uint8_t MD5_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:8 bytes::datavoid * dataDefinition: tc.h:15 bytes::data_lenuint32_t data_lenDefinition: tc.h:16 tc_hash_type_tenum tc_hash_type tc_hash_type_tDefinition: tc.h:51 SHA_224_PKCS_IDconst uint8_t SHA_224_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:24 tc_init_bytesbytes_t * tc_init_bytes(void *bs, size_t len)Definition: structs_init.c:18 SHA_256_PKCS_IDconst uint8_t SHA_256_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:28 SHA_384_PKCS_IDconst uint8_t SHA_384_PKCS_ID[]Definition: algorithms_pkcs1_encoding.c:32 Generated by
1.8.11