1 /*
2 * Copyright 2018-2022 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 <openssl/core_dispatch.h>
11 #include <openssl/core_names.h>
12 #include <openssl/params.h>
13 #include <openssl/evp.h>
14 #include <openssl/err.h>
15 #include <openssl/proverr.h>
16
17 #include "crypto/poly1305.h"
18
19 #include "prov/implementations.h"
20 #include "prov/providercommon.h"
21
22 /*
23 * Forward declaration of everything implemented here. This is not strictly
24 * necessary for the compiler, but provides an assurance that the signatures
25 * of the functions in the dispatch table are correct.
26 */
27 static OSSL_FUNC_mac_newctx_fn poly1305_new;
28 static OSSL_FUNC_mac_dupctx_fn poly1305_dup;
29 static OSSL_FUNC_mac_freectx_fn poly1305_free;
30 static OSSL_FUNC_mac_gettable_params_fn poly1305_gettable_params;
31 static OSSL_FUNC_mac_get_params_fn poly1305_get_params;
32 static OSSL_FUNC_mac_settable_ctx_params_fn poly1305_settable_ctx_params;
33 static OSSL_FUNC_mac_set_ctx_params_fn poly1305_set_ctx_params;
34 static OSSL_FUNC_mac_init_fn poly1305_init;
35 static OSSL_FUNC_mac_update_fn poly1305_update;
36 static OSSL_FUNC_mac_final_fn poly1305_final;
37
38 struct poly1305_data_st {
39 void *provctx;
40 int updated;
41 POLY1305 poly1305; /* Poly1305 data */
42 };
43
poly1305_new(void * provctx)44 static void *poly1305_new(void *provctx)
45 {
46 struct poly1305_data_st *ctx;
47
48 if (!ossl_prov_is_running())
49 return NULL;
50 ctx = OPENSSL_zalloc(sizeof(*ctx));
51 if (ctx != NULL)
52 ctx->provctx = provctx;
53 return ctx;
54 }
55
poly1305_free(void * vmacctx)56 static void poly1305_free(void *vmacctx)
57 {
58 OPENSSL_free(vmacctx);
59 }
60
poly1305_dup(void * vsrc)61 static void *poly1305_dup(void *vsrc)
62 {
63 struct poly1305_data_st *src = vsrc;
64 struct poly1305_data_st *dst;
65
66 if (!ossl_prov_is_running())
67 return NULL;
68 dst = OPENSSL_malloc(sizeof(*dst));
69 if (dst == NULL)
70 return NULL;
71
72 *dst = *src;
73 return dst;
74 }
75
poly1305_size(void)76 static size_t poly1305_size(void)
77 {
78 return POLY1305_DIGEST_SIZE;
79 }
80
poly1305_setkey(struct poly1305_data_st * ctx,const unsigned char * key,size_t keylen)81 static int poly1305_setkey(struct poly1305_data_st *ctx,
82 const unsigned char *key, size_t keylen)
83 {
84 if (keylen != POLY1305_KEY_SIZE) {
85 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
86 return 0;
87 }
88 Poly1305_Init(&ctx->poly1305, key);
89 ctx->updated = 0;
90 return 1;
91 }
92
poly1305_init(void * vmacctx,const unsigned char * key,size_t keylen,const OSSL_PARAM params[])93 static int poly1305_init(void *vmacctx, const unsigned char *key,
94 size_t keylen, const OSSL_PARAM params[])
95 {
96 struct poly1305_data_st *ctx = vmacctx;
97
98 /* initialize the context in MAC_ctrl function */
99 if (!ossl_prov_is_running() || !poly1305_set_ctx_params(ctx, params))
100 return 0;
101 if (key != NULL)
102 return poly1305_setkey(ctx, key, keylen);
103 /* no reinitialization of context with the same key is allowed */
104 return ctx->updated == 0;
105 }
106
poly1305_update(void * vmacctx,const unsigned char * data,size_t datalen)107 static int poly1305_update(void *vmacctx, const unsigned char *data,
108 size_t datalen)
109 {
110 struct poly1305_data_st *ctx = vmacctx;
111
112 ctx->updated = 1;
113 if (datalen == 0)
114 return 1;
115
116 /* poly1305 has nothing to return in its update function */
117 Poly1305_Update(&ctx->poly1305, data, datalen);
118 return 1;
119 }
120
poly1305_final(void * vmacctx,unsigned char * out,size_t * outl,size_t outsize)121 static int poly1305_final(void *vmacctx, unsigned char *out, size_t *outl,
122 size_t outsize)
123 {
124 struct poly1305_data_st *ctx = vmacctx;
125
126 if (!ossl_prov_is_running())
127 return 0;
128 ctx->updated = 1;
129 Poly1305_Final(&ctx->poly1305, out);
130 *outl = poly1305_size();
131 return 1;
132 }
133
134 static const OSSL_PARAM known_gettable_params[] = {
135 OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
136 OSSL_PARAM_END
137 };
poly1305_gettable_params(void * provctx)138 static const OSSL_PARAM *poly1305_gettable_params(void *provctx)
139 {
140 return known_gettable_params;
141 }
142
poly1305_get_params(OSSL_PARAM params[])143 static int poly1305_get_params(OSSL_PARAM params[])
144 {
145 OSSL_PARAM *p;
146
147 if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
148 return OSSL_PARAM_set_size_t(p, poly1305_size());
149
150 return 1;
151 }
152
153 static const OSSL_PARAM known_settable_ctx_params[] = {
154 OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
155 OSSL_PARAM_END
156 };
poly1305_settable_ctx_params(ossl_unused void * ctx,ossl_unused void * provctx)157 static const OSSL_PARAM *poly1305_settable_ctx_params(ossl_unused void *ctx,
158 ossl_unused void *provctx)
159 {
160 return known_settable_ctx_params;
161 }
162
poly1305_set_ctx_params(void * vmacctx,const OSSL_PARAM * params)163 static int poly1305_set_ctx_params(void *vmacctx, const OSSL_PARAM *params)
164 {
165 struct poly1305_data_st *ctx = vmacctx;
166 const OSSL_PARAM *p;
167
168 if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL
169 && !poly1305_setkey(ctx, p->data, p->data_size))
170 return 0;
171 return 1;
172 }
173
174 const OSSL_DISPATCH ossl_poly1305_functions[] = {
175 { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))poly1305_new },
176 { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))poly1305_dup },
177 { OSSL_FUNC_MAC_FREECTX, (void (*)(void))poly1305_free },
178 { OSSL_FUNC_MAC_INIT, (void (*)(void))poly1305_init },
179 { OSSL_FUNC_MAC_UPDATE, (void (*)(void))poly1305_update },
180 { OSSL_FUNC_MAC_FINAL, (void (*)(void))poly1305_final },
181 { OSSL_FUNC_MAC_GETTABLE_PARAMS, (void (*)(void))poly1305_gettable_params },
182 { OSSL_FUNC_MAC_GET_PARAMS, (void (*)(void))poly1305_get_params },
183 { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
184 (void (*)(void))poly1305_settable_ctx_params },
185 { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))poly1305_set_ctx_params },
186 { 0, NULL }
187 };
188