Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ecc_sign_hash.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents e9dba7abd939
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9
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diff changeset
10 #include "tomcrypt.h"
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11
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8305ebe45940 Put Dropbear config in a separate file
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12 #if defined(LTC_MECC) && defined(LTC_DER)
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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13
382
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14 /**
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15 @file ecc_sign_hash.c
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16 ECC Crypto, Tom St Denis
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17 */
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18
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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19 static int _ecc_sign_hash(const unsigned char *in, unsigned long inlen,
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20 unsigned char *out, unsigned long *outlen,
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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21 prng_state *prng, int wprng, ecc_key *key, int sigformat)
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22 {
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23 ecc_key pubkey;
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24 void *r, *s, *e, *p, *b;
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25 int err, max_iterations = LTC_PK_MAX_RETRIES;
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26 unsigned long pbits, pbytes, i, shift_right;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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27 unsigned char ch, buf[MAXBLOCKSIZE];
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28
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29 LTC_ARGCHK(in != NULL);
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30 LTC_ARGCHK(out != NULL);
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31 LTC_ARGCHK(outlen != NULL);
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32 LTC_ARGCHK(key != NULL);
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33
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34 /* is this a private key? */
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35 if (key->type != PK_PRIVATE) {
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36 return CRYPT_PK_NOT_PRIVATE;
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37 }
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38
382
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39 /* is the IDX valid ? */
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40 if (ltc_ecc_is_valid_idx(key->idx) != 1) {
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41 return CRYPT_PK_INVALID_TYPE;
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42 }
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43
382
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44 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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45 return err;
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46 }
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47
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48 /* init the bignums */
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49 if ((err = mp_init_multi(&r, &s, &p, &e, &b, NULL)) != CRYPT_OK) {
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50 return err;
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51 }
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52 if ((err = mp_read_radix(p, (char *)key->dp->order, 16)) != CRYPT_OK) { goto errnokey; }
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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53
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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54 /* get the hash and load it as a bignum into 'e' */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55 pbits = mp_count_bits(p);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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56 pbytes = (pbits+7) >> 3;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 if (pbits > inlen*8) {
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58 if ((err = mp_read_unsigned_bin(e, (unsigned char *)in, inlen)) != CRYPT_OK) { goto errnokey; }
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59 }
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60 else if (pbits % 8 == 0) {
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61 if ((err = mp_read_unsigned_bin(e, (unsigned char *)in, pbytes)) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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62 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63 else {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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64 shift_right = 8 - pbits % 8;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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65 for (i=0, ch=0; i<pbytes; i++) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 buf[i] = ch;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 ch = (in[i] << (8-shift_right));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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68 buf[i] = buf[i] ^ (in[i] >> shift_right);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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69 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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70 if ((err = mp_read_unsigned_bin(e, (unsigned char *)buf, pbytes)) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
71 }
382
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72
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diff changeset
73 /* make up a key and export the public copy */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
74 do {
382
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75 if ((err = ecc_make_key_ex(prng, wprng, &pubkey, key->dp)) != CRYPT_OK) {
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76 goto errnokey;
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77 }
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78
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79 /* find r = x1 mod n */
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1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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80 if ((err = mp_mod(pubkey.pubkey.x, p, r)) != CRYPT_OK) { goto error; }
382
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81
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82 if (mp_iszero(r) == LTC_MP_YES) {
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83 ecc_free(&pubkey);
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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84 } else {
1711
e9dba7abd939 Merge libtomcrypt v1.18.2
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85 if ((err = rand_bn_upto(b, p, prng, wprng)) != CRYPT_OK) { goto error; } /* b = blinding value */
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1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
86 /* find s = (e + xr)/k */
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e9dba7abd939 Merge libtomcrypt v1.18.2
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diff changeset
87 if ((err = mp_mulmod(pubkey.k, b, p, pubkey.k)) != CRYPT_OK) { goto error; } /* k = kb */
e9dba7abd939 Merge libtomcrypt v1.18.2
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diff changeset
88 if ((err = mp_invmod(pubkey.k, p, pubkey.k)) != CRYPT_OK) { goto error; } /* k = 1/kb */
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1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
89 if ((err = mp_mulmod(key->k, r, p, s)) != CRYPT_OK) { goto error; } /* s = xr */
1711
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
90 if ((err = mp_mulmod(pubkey.k, s, p, s)) != CRYPT_OK) { goto error; } /* s = xr/kb */
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
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diff changeset
91 if ((err = mp_mulmod(pubkey.k, e, p, e)) != CRYPT_OK) { goto error; } /* e = e/kb */
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
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diff changeset
92 if ((err = mp_add(e, s, s)) != CRYPT_OK) { goto error; } /* s = e/kb + xr/kb */
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
93 if ((err = mp_mulmod(s, b, p, s)) != CRYPT_OK) { goto error; } /* s = b(e/kb + xr/kb) = (e + xr)/k */
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
94 ecc_free(&pubkey);
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
95 if (mp_iszero(s) == LTC_MP_NO) {
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
96 break;
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
97 }
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
99 } while (--max_iterations > 0);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
100
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
101 if (max_iterations == 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
102 goto errnokey;
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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diff changeset
104
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
105 if (sigformat == 1) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
106 /* RFC7518 format */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
107 if (*outlen < 2*pbytes) { err = CRYPT_MEM; goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
108 zeromem(out, 2*pbytes);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
109 i = mp_unsigned_bin_size(r);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
110 if ((err = mp_to_unsigned_bin(r, out + (pbytes - i))) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
111 i = mp_unsigned_bin_size(s);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
112 if ((err = mp_to_unsigned_bin(s, out + (2*pbytes - i))) != CRYPT_OK) { goto errnokey; }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
113 *outlen = 2*pbytes;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
114 err = CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
115 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
116 else {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
117 /* store as ASN.1 SEQUENCE { r, s -- integer } */
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
118 err = der_encode_sequence_multi(out, outlen,
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
119 LTC_ASN1_INTEGER, 1UL, r,
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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diff changeset
120 LTC_ASN1_INTEGER, 1UL, s,
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
121 LTC_ASN1_EOL, 0UL, NULL);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
122 }
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123 goto errnokey;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124 error:
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
125 ecc_free(&pubkey);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
126 errnokey:
1711
e9dba7abd939 Merge libtomcrypt v1.18.2
Matt Johnston <matt@ucc.asn.au>
parents: 1710
diff changeset
127 mp_clear_multi(r, s, p, e, b, NULL);
1710
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
Matt Johnston <matt@ucc.asn.au>
parents: 1476
diff changeset
128 return err;
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
129 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
diff changeset
130
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
131 /**
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
132 Sign a message digest
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
133 @param in The message digest to sign
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
134 @param inlen The length of the digest
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
135 @param out [out] The destination for the signature
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
136 @param outlen [in/out] The max size and resulting size of the signature
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
137 @param prng An active PRNG state
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
138 @param wprng The index of the PRNG you wish to use
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
139 @param key A private ECC key
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
140 @return CRYPT_OK if successful
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
141 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
142 int ecc_sign_hash(const unsigned char *in, unsigned long inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
143 unsigned char *out, unsigned long *outlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
144 prng_state *prng, int wprng, ecc_key *key)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
145 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
146 return _ecc_sign_hash(in, inlen, out, outlen, prng, wprng, key, 0);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
147 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
148
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
149 /**
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
150 Sign a message digest in RFC7518 format
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
151 @param in The message digest to sign
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
152 @param inlen The length of the digest
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
153 @param out [out] The destination for the signature
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
154 @param outlen [in/out] The max size and resulting size of the signature
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
155 @param prng An active PRNG state
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
156 @param wprng The index of the PRNG you wish to use
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
157 @param key A private ECC key
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
158 @return CRYPT_OK if successful
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
159 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
160 int ecc_sign_hash_rfc7518(const unsigned char *in, unsigned long inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
161 unsigned char *out, unsigned long *outlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
162 prng_state *prng, int wprng, ecc_key *key)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
163 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
164 return _ecc_sign_hash(in, inlen, out, outlen, prng, wprng, key, 1);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
165 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
166
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
169 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
170 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
171 /* commit time: $Format:%ai$ */