1 /*
2 * Copyright 2018-2021 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 POLY1305 poly1305; /* Poly1305 data */
41 };
42
poly1305_new(void * provctx)43 static void *poly1305_new(void *provctx)
44 {
45 struct poly1305_data_st *ctx;
46
47 if (!ossl_prov_is_running())
48 return NULL;
49 ctx = OPENSSL_zalloc(sizeof(*ctx));
50 if (ctx != NULL)
51 ctx->provctx = provctx;
52 return ctx;
53 }
54
poly1305_free(void * vmacctx)55 static void poly1305_free(void *vmacctx)
56 {
57 OPENSSL_free(vmacctx);
58 }
59
poly1305_dup(void * vsrc)60 static void *poly1305_dup(void *vsrc)
61 {
62 struct poly1305_data_st *src = vsrc;
63 struct poly1305_data_st *dst;
64
65 if (!ossl_prov_is_running())
66 return NULL;
67 dst = poly1305_new(src->provctx);
68 if (dst == NULL)
69 return NULL;
70
71 dst->poly1305 = src->poly1305;
72 return dst;
73 }
74
poly1305_size(void)75 static size_t poly1305_size(void)
76 {
77 return POLY1305_DIGEST_SIZE;
78 }
79
poly1305_setkey(struct poly1305_data_st * ctx,const unsigned char * key,size_t keylen)80 static int poly1305_setkey(struct poly1305_data_st *ctx,
81 const unsigned char *key, size_t keylen)
82 {
83 if (keylen != POLY1305_KEY_SIZE) {
84 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
85 return 0;
86 }
87 Poly1305_Init(&ctx->poly1305, key);
88 return 1;
89 }
90
poly1305_init(void * vmacctx,const unsigned char * key,size_t keylen,const OSSL_PARAM params[])91 static int poly1305_init(void *vmacctx, const unsigned char *key,
92 size_t keylen, const OSSL_PARAM params[])
93 {
94 struct poly1305_data_st *ctx = vmacctx;
95
96 /* initialize the context in MAC_ctrl function */
97 if (!ossl_prov_is_running() || !poly1305_set_ctx_params(ctx, params))
98 return 0;
99 if (key != NULL)
100 return poly1305_setkey(ctx, key, keylen);
101 return 1;
102 }
103
poly1305_update(void * vmacctx,const unsigned char * data,size_t datalen)104 static int poly1305_update(void *vmacctx, const unsigned char *data,
105 size_t datalen)
106 {
107 struct poly1305_data_st *ctx = vmacctx;
108
109 if (datalen == 0)
110 return 1;
111
112 /* poly1305 has nothing to return in its update function */
113 Poly1305_Update(&ctx->poly1305, data, datalen);
114 return 1;
115 }
116
poly1305_final(void * vmacctx,unsigned char * out,size_t * outl,size_t outsize)117 static int poly1305_final(void *vmacctx, unsigned char *out, size_t *outl,
118 size_t outsize)
119 {
120 struct poly1305_data_st *ctx = vmacctx;
121
122 if (!ossl_prov_is_running())
123 return 0;
124 Poly1305_Final(&ctx->poly1305, out);
125 *outl = poly1305_size();
126 return 1;
127 }
128
129 static const OSSL_PARAM known_gettable_params[] = {
130 OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
131 OSSL_PARAM_END
132 };
poly1305_gettable_params(void * provctx)133 static const OSSL_PARAM *poly1305_gettable_params(void *provctx)
134 {
135 return known_gettable_params;
136 }
137
poly1305_get_params(OSSL_PARAM params[])138 static int poly1305_get_params(OSSL_PARAM params[])
139 {
140 OSSL_PARAM *p;
141
142 if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
143 return OSSL_PARAM_set_size_t(p, poly1305_size());
144
145 return 1;
146 }
147
148 static const OSSL_PARAM known_settable_ctx_params[] = {
149 OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
150 OSSL_PARAM_END
151 };
poly1305_settable_ctx_params(ossl_unused void * ctx,ossl_unused void * provctx)152 static const OSSL_PARAM *poly1305_settable_ctx_params(ossl_unused void *ctx,
153 ossl_unused void *provctx)
154 {
155 return known_settable_ctx_params;
156 }
157
poly1305_set_ctx_params(void * vmacctx,const OSSL_PARAM * params)158 static int poly1305_set_ctx_params(void *vmacctx, const OSSL_PARAM *params)
159 {
160 struct poly1305_data_st *ctx = vmacctx;
161 const OSSL_PARAM *p;
162
163 if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL
164 && !poly1305_setkey(ctx, p->data, p->data_size))
165 return 0;
166 return 1;
167 }
168
169 const OSSL_DISPATCH ossl_poly1305_functions[] = {
170 { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))poly1305_new },
171 { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))poly1305_dup },
172 { OSSL_FUNC_MAC_FREECTX, (void (*)(void))poly1305_free },
173 { OSSL_FUNC_MAC_INIT, (void (*)(void))poly1305_init },
174 { OSSL_FUNC_MAC_UPDATE, (void (*)(void))poly1305_update },
175 { OSSL_FUNC_MAC_FINAL, (void (*)(void))poly1305_final },
176 { OSSL_FUNC_MAC_GETTABLE_PARAMS, (void (*)(void))poly1305_gettable_params },
177 { OSSL_FUNC_MAC_GET_PARAMS, (void (*)(void))poly1305_get_params },
178 { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
179 (void (*)(void))poly1305_settable_ctx_params },
180 { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))poly1305_set_ctx_params },
181 { 0, NULL }
182 };
183