2 * Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
11 #include "internal/cryptlib.h"
12 #include <openssl/x509.h>
13 #include <openssl/x509v3.h>
14 #include <openssl/evp.h>
15 #include <openssl/err.h>
16 #include "internal/siphash.h"
17 #include "siphash_local.h"
18 #include "internal/evp_int.h"
20 /* SIPHASH pkey context structure */
22 typedef struct siphash_pkey_ctx_st {
23 ASN1_OCTET_STRING ktmp; /* Temp storage for key */
27 static int pkey_siphash_init(EVP_PKEY_CTX *ctx)
29 SIPHASH_PKEY_CTX *pctx;
31 if ((pctx = OPENSSL_zalloc(sizeof(*pctx))) == NULL) {
32 CRYPTOerr(CRYPTO_F_PKEY_SIPHASH_INIT, ERR_R_MALLOC_FAILURE);
35 pctx->ktmp.type = V_ASN1_OCTET_STRING;
37 EVP_PKEY_CTX_set_data(ctx, pctx);
38 EVP_PKEY_CTX_set0_keygen_info(ctx, NULL, 0);
42 static void pkey_siphash_cleanup(EVP_PKEY_CTX *ctx)
44 SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
47 OPENSSL_clear_free(pctx->ktmp.data, pctx->ktmp.length);
48 OPENSSL_clear_free(pctx, sizeof(*pctx));
49 EVP_PKEY_CTX_set_data(ctx, NULL);
53 static int pkey_siphash_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
55 SIPHASH_PKEY_CTX *sctx, *dctx;
57 /* allocate memory for dst->data and a new SIPHASH_CTX in dst->data->ctx */
58 if (!pkey_siphash_init(dst))
60 sctx = EVP_PKEY_CTX_get_data(src);
61 dctx = EVP_PKEY_CTX_get_data(dst);
62 if (ASN1_STRING_get0_data(&sctx->ktmp) != NULL &&
63 !ASN1_STRING_copy(&dctx->ktmp, &sctx->ktmp)) {
64 /* cleanup and free the SIPHASH_PKEY_CTX in dst->data */
65 pkey_siphash_cleanup(dst);
68 memcpy(&dctx->ctx, &sctx->ctx, sizeof(SIPHASH));
72 static int pkey_siphash_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
74 ASN1_OCTET_STRING *key;
75 SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
77 if (ASN1_STRING_get0_data(&pctx->ktmp) == NULL)
79 key = ASN1_OCTET_STRING_dup(&pctx->ktmp);
82 return EVP_PKEY_assign_SIPHASH(pkey, key);
85 static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
87 SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(EVP_MD_CTX_pkey_ctx(ctx));
89 SipHash_Update(&pctx->ctx, data, count);
93 static int siphash_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
95 SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
96 const unsigned char* key;
99 key = EVP_PKEY_get0_siphash(EVP_PKEY_CTX_get0_pkey(ctx), &len);
100 if (key == NULL || len != SIPHASH_KEY_SIZE)
102 EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
103 EVP_MD_CTX_set_update_fn(mctx, int_update);
104 return SipHash_Init(&pctx->ctx, key, 0, 0);
106 static int siphash_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
109 SIPHASH_PKEY_CTX *pctx = ctx->data;
111 *siglen = SipHash_hash_size(&pctx->ctx);
113 return SipHash_Final(&pctx->ctx, sig, *siglen);
117 static int pkey_siphash_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
119 SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
120 const unsigned char *key;
125 case EVP_PKEY_CTRL_MD:
129 case EVP_PKEY_CTRL_SET_DIGEST_SIZE:
130 return SipHash_set_hash_size(&pctx->ctx, p1);
132 case EVP_PKEY_CTRL_SET_MAC_KEY:
133 case EVP_PKEY_CTRL_DIGESTINIT:
134 if (type == EVP_PKEY_CTRL_SET_MAC_KEY) {
135 /* user explicitly setting the key */
139 /* user indirectly setting the key via EVP_DigestSignInit */
140 key = EVP_PKEY_get0_siphash(EVP_PKEY_CTX_get0_pkey(ctx), &len);
142 if (key == NULL || len != SIPHASH_KEY_SIZE ||
143 !ASN1_OCTET_STRING_set(&pctx->ktmp, key, len))
145 /* use default rounds (2,4) */
146 return SipHash_Init(&pctx->ctx, ASN1_STRING_get0_data(&pctx->ktmp),
156 static int pkey_siphash_ctrl_str(EVP_PKEY_CTX *ctx,
157 const char *type, const char *value)
161 if (strcmp(type, "digestsize") == 0) {
162 size_t hash_size = atoi(value);
164 return pkey_siphash_ctrl(ctx, EVP_PKEY_CTRL_SET_DIGEST_SIZE, hash_size,
167 if (strcmp(type, "key") == 0)
168 return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
169 if (strcmp(type, "hexkey") == 0)
170 return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
174 const EVP_PKEY_METHOD siphash_pkey_meth = {
176 EVP_PKEY_FLAG_SIGCTX_CUSTOM, /* we don't deal with a separate MD */
179 pkey_siphash_cleanup,
192 siphash_signctx_init,
204 pkey_siphash_ctrl_str