1 /*
2 * Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <string.h>
11 #include <openssl/err.h>
12 #include <openssl/proverr.h>
13 #include "crypto/ecx.h"
14 #include "internal/common.h" /* for ossl_assert() */
15
16 #ifdef S390X_EC_ASM
17 # include "s390x_arch.h"
18 #endif
19
ossl_ecx_key_new(OSSL_LIB_CTX * libctx,ECX_KEY_TYPE type,int haspubkey,const char * propq)20 ECX_KEY *ossl_ecx_key_new(OSSL_LIB_CTX *libctx, ECX_KEY_TYPE type, int haspubkey,
21 const char *propq)
22 {
23 ECX_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
24
25 if (ret == NULL)
26 return NULL;
27
28 ret->libctx = libctx;
29 ret->haspubkey = haspubkey;
30 switch (type) {
31 case ECX_KEY_TYPE_X25519:
32 ret->keylen = X25519_KEYLEN;
33 break;
34 case ECX_KEY_TYPE_X448:
35 ret->keylen = X448_KEYLEN;
36 break;
37 case ECX_KEY_TYPE_ED25519:
38 ret->keylen = ED25519_KEYLEN;
39 break;
40 case ECX_KEY_TYPE_ED448:
41 ret->keylen = ED448_KEYLEN;
42 break;
43 }
44 ret->type = type;
45
46 if (!CRYPTO_NEW_REF(&ret->references, 1))
47 goto err;
48
49 if (propq != NULL) {
50 ret->propq = OPENSSL_strdup(propq);
51 if (ret->propq == NULL)
52 goto err;
53 }
54 return ret;
55 err:
56 if (ret != NULL) {
57 OPENSSL_free(ret->propq);
58 CRYPTO_FREE_REF(&ret->references);
59 }
60 OPENSSL_free(ret);
61 return NULL;
62 }
63
ossl_ecx_key_free(ECX_KEY * key)64 void ossl_ecx_key_free(ECX_KEY *key)
65 {
66 int i;
67
68 if (key == NULL)
69 return;
70
71 CRYPTO_DOWN_REF(&key->references, &i);
72 REF_PRINT_COUNT("ECX_KEY", key);
73 if (i > 0)
74 return;
75 REF_ASSERT_ISNT(i < 0);
76
77 OPENSSL_free(key->propq);
78 OPENSSL_secure_clear_free(key->privkey, key->keylen);
79 CRYPTO_FREE_REF(&key->references);
80 OPENSSL_free(key);
81 }
82
ossl_ecx_key_set0_libctx(ECX_KEY * key,OSSL_LIB_CTX * libctx)83 void ossl_ecx_key_set0_libctx(ECX_KEY *key, OSSL_LIB_CTX *libctx)
84 {
85 key->libctx = libctx;
86 }
87
ossl_ecx_key_up_ref(ECX_KEY * key)88 int ossl_ecx_key_up_ref(ECX_KEY *key)
89 {
90 int i;
91
92 if (CRYPTO_UP_REF(&key->references, &i) <= 0)
93 return 0;
94
95 REF_PRINT_COUNT("ECX_KEY", key);
96 REF_ASSERT_ISNT(i < 2);
97 return ((i > 1) ? 1 : 0);
98 }
99
ossl_ecx_key_allocate_privkey(ECX_KEY * key)100 unsigned char *ossl_ecx_key_allocate_privkey(ECX_KEY *key)
101 {
102 key->privkey = OPENSSL_secure_zalloc(key->keylen);
103
104 return key->privkey;
105 }
106
ossl_ecx_compute_key(ECX_KEY * peer,ECX_KEY * priv,size_t keylen,unsigned char * secret,size_t * secretlen,size_t outlen)107 int ossl_ecx_compute_key(ECX_KEY *peer, ECX_KEY *priv, size_t keylen,
108 unsigned char *secret, size_t *secretlen, size_t outlen)
109 {
110 if (priv == NULL
111 || priv->privkey == NULL
112 || peer == NULL) {
113 ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_KEY);
114 return 0;
115 }
116
117 if (!ossl_assert(keylen == X25519_KEYLEN
118 || keylen == X448_KEYLEN)) {
119 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
120 return 0;
121 }
122
123 if (secret == NULL) {
124 *secretlen = keylen;
125 return 1;
126 }
127 if (outlen < keylen) {
128 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
129 return 0;
130 }
131
132 if (keylen == X25519_KEYLEN) {
133 #ifdef S390X_EC_ASM
134 if (OPENSSL_s390xcap_P.pcc[1]
135 & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_X25519)) {
136 if (s390x_x25519_mul(secret, peer->pubkey, priv->privkey) == 0) {
137 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_DURING_DERIVATION);
138 return 0;
139 }
140 } else
141 #endif
142 if (ossl_x25519(secret, priv->privkey, peer->pubkey) == 0) {
143 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_DURING_DERIVATION);
144 return 0;
145 }
146 } else {
147 #ifdef S390X_EC_ASM
148 if (OPENSSL_s390xcap_P.pcc[1]
149 & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_X448)) {
150 if (s390x_x448_mul(secret, peer->pubkey, priv->privkey) == 0) {
151 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_DURING_DERIVATION);
152 return 0;
153 }
154 } else
155 #endif
156 if (ossl_x448(secret, priv->privkey, peer->pubkey) == 0) {
157 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_DURING_DERIVATION);
158 return 0;
159 }
160 }
161 *secretlen = keylen;
162 return 1;
163 }
164
