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Diffstat (limited to 'src/lib/libcrypto/rsa/rsa_oaep.c')
-rw-r--r--src/lib/libcrypto/rsa/rsa_oaep.c168
1 files changed, 0 insertions, 168 deletions
diff --git a/src/lib/libcrypto/rsa/rsa_oaep.c b/src/lib/libcrypto/rsa/rsa_oaep.c
deleted file mode 100644
index 1849e55cd5..0000000000
--- a/src/lib/libcrypto/rsa/rsa_oaep.c
+++ /dev/null
@@ -1,168 +0,0 @@
1/* crypto/rsa/rsa_oaep.c */
2/* Written by Ulf Moeller. This software is distributed on an "AS IS"
3 basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. */
4
5/* EME_OAEP as defined in RFC 2437 (PKCS #1 v2.0) */
6
7#if !defined(NO_SHA) && !defined(NO_SHA1)
8#include <stdio.h>
9#include "cryptlib.h"
10#include <openssl/bn.h>
11#include <openssl/rsa.h>
12#include <openssl/sha.h>
13#include <openssl/rand.h>
14
15int MGF1(unsigned char *mask, long len, unsigned char *seed, long seedlen);
16
17int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
18 unsigned char *from, int flen, unsigned char *param, int plen)
19 {
20 int i, emlen = tlen - 1;
21 unsigned char *db, *seed;
22 unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH];
23
24 if (flen > emlen - 2 * SHA_DIGEST_LENGTH - 1)
25 {
26 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP,
27 RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
28 return (0);
29 }
30
31 if (emlen < 2 * SHA_DIGEST_LENGTH + 1)
32 {
33 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL);
34 return (0);
35 }
36
37 dbmask = OPENSSL_malloc(emlen - SHA_DIGEST_LENGTH);
38 if (dbmask == NULL)
39 {
40 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
41 return (0);
42 }
43
44 to[0] = 0;
45 seed = to + 1;
46 db = to + SHA_DIGEST_LENGTH + 1;
47
48 SHA1(param, plen, db);
49 memset(db + SHA_DIGEST_LENGTH, 0,
50 emlen - flen - 2 * SHA_DIGEST_LENGTH - 1);
51 db[emlen - flen - SHA_DIGEST_LENGTH - 1] = 0x01;
52 memcpy(db + emlen - flen - SHA_DIGEST_LENGTH, from, (unsigned int) flen);
53 if (RAND_bytes(seed, SHA_DIGEST_LENGTH) <= 0)
54 return (0);
55#ifdef PKCS_TESTVECT
56 memcpy(seed,
57 "\xaa\xfd\x12\xf6\x59\xca\xe6\x34\x89\xb4\x79\xe5\x07\x6d\xde\xc2\xf0\x6c\xb5\x8f",
58 20);
59#endif
60
61 MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH);
62 for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++)
63 db[i] ^= dbmask[i];
64
65 MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH);
66 for (i = 0; i < SHA_DIGEST_LENGTH; i++)
67 seed[i] ^= seedmask[i];
68
69 OPENSSL_free(dbmask);
70 return (1);
71 }
72
73int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
74 unsigned char *from, int flen, int num, unsigned char *param,
75 int plen)
76 {
77 int i, dblen, mlen = -1;
78 unsigned char *maskeddb;
79 int lzero;
80 unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
81
82 if (--num < 2 * SHA_DIGEST_LENGTH + 1)
83 goto decoding_err;
84
85 lzero = num - flen;
86 if (lzero < 0)
87 goto decoding_err;
88 maskeddb = from - lzero + SHA_DIGEST_LENGTH;
89
90 dblen = num - SHA_DIGEST_LENGTH;
91 db = OPENSSL_malloc(dblen);
92 if (db == NULL)
93 {
94 RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
95 return (-1);
96 }
97
98 MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen);
99 for (i = lzero; i < SHA_DIGEST_LENGTH; i++)
100 seed[i] ^= from[i - lzero];
101
102 MGF1(db, dblen, seed, SHA_DIGEST_LENGTH);
103 for (i = 0; i < dblen; i++)
104 db[i] ^= maskeddb[i];
105
106 SHA1(param, plen, phash);
107
108 if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0)
109 goto decoding_err;
110 else
111 {
112 for (i = SHA_DIGEST_LENGTH; i < dblen; i++)
113 if (db[i] != 0x00)
114 break;
115 if (db[i] != 0x01 || i++ >= dblen)
116 goto decoding_err;
117 else
118 {
119 mlen = dblen - i;
120 if (tlen < mlen)
121 {
122 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE);
123 mlen = -1;
124 }
125 else
126 memcpy(to, db + i, mlen);
127 }
128 }
129 OPENSSL_free(db);
130 return (mlen);
131
132decoding_err:
133 /* to avoid chosen ciphertext attacks, the error message should not reveal
134 * which kind of decoding error happened */
135 RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
136 if (db != NULL) OPENSSL_free(db);
137 return -1;
138 }
139
140int MGF1(unsigned char *mask, long len, unsigned char *seed, long seedlen)
141 {
142 long i, outlen = 0;
143 unsigned char cnt[4];
144 SHA_CTX c;
145 unsigned char md[SHA_DIGEST_LENGTH];
146
147 for (i = 0; outlen < len; i++)
148 {
149 cnt[0] = (i >> 24) & 255, cnt[1] = (i >> 16) & 255,
150 cnt[2] = (i >> 8) & 255, cnt[3] = i & 255;
151 SHA1_Init(&c);
152 SHA1_Update(&c, seed, seedlen);
153 SHA1_Update(&c, cnt, 4);
154 if (outlen + SHA_DIGEST_LENGTH <= len)
155 {
156 SHA1_Final(mask + outlen, &c);
157 outlen += SHA_DIGEST_LENGTH;
158 }
159 else
160 {
161 SHA1_Final(md, &c);
162 memcpy(mask + outlen, md, len - outlen);
163 outlen = len;
164 }
165 }
166 return (0);
167 }
168#endif