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/*
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* Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include "crypto/siphash.h"
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#include "siphash_local.h"
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#include "crypto/evp.h"
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/* SIPHASH pkey context structure */
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typedef struct siphash_pkey_ctx_st {
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ASN1_OCTET_STRING ktmp; /* Temp storage for key */
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SIPHASH ctx;
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} SIPHASH_PKEY_CTX;
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static int pkey_siphash_init(EVP_PKEY_CTX *ctx)
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{
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SIPHASH_PKEY_CTX *pctx;
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if ((pctx = OPENSSL_zalloc(sizeof(*pctx))) == NULL) {
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CRYPTOerr(CRYPTO_F_PKEY_SIPHASH_INIT, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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pctx->ktmp.type = V_ASN1_OCTET_STRING;
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EVP_PKEY_CTX_set_data(ctx, pctx);
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EVP_PKEY_CTX_set0_keygen_info(ctx, NULL, 0);
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return 1;
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}
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static void pkey_siphash_cleanup(EVP_PKEY_CTX *ctx)
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{
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SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
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if (pctx != NULL) {
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OPENSSL_clear_free(pctx->ktmp.data, pctx->ktmp.length);
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OPENSSL_clear_free(pctx, sizeof(*pctx));
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EVP_PKEY_CTX_set_data(ctx, NULL);
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}
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}
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static int pkey_siphash_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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SIPHASH_PKEY_CTX *sctx, *dctx;
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/* allocate memory for dst->data and a new SIPHASH_CTX in dst->data->ctx */
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if (!pkey_siphash_init(dst))
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return 0;
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sctx = EVP_PKEY_CTX_get_data(src);
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dctx = EVP_PKEY_CTX_get_data(dst);
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if (ASN1_STRING_get0_data(&sctx->ktmp) != NULL &&
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!ASN1_STRING_copy(&dctx->ktmp, &sctx->ktmp)) {
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/* cleanup and free the SIPHASH_PKEY_CTX in dst->data */
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pkey_siphash_cleanup(dst);
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return 0;
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}
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memcpy(&dctx->ctx, &sctx->ctx, sizeof(SIPHASH));
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return 1;
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}
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static int pkey_siphash_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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ASN1_OCTET_STRING *key;
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SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
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if (ASN1_STRING_get0_data(&pctx->ktmp) == NULL)
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return 0;
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key = ASN1_OCTET_STRING_dup(&pctx->ktmp);
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if (key == NULL)
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return 0;
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return EVP_PKEY_assign_SIPHASH(pkey, key);
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}
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static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
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{
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SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(EVP_MD_CTX_pkey_ctx(ctx));
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SipHash_Update(&pctx->ctx, data, count);
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return 1;
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}
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static int siphash_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
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{
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SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
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const unsigned char* key;
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size_t len;
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key = EVP_PKEY_get0_siphash(EVP_PKEY_CTX_get0_pkey(ctx), &len;;
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if (key == NULL || len != SIPHASH_KEY_SIZE)
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return 0;
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EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
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EVP_MD_CTX_set_update_fn(mctx, int_update);
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return SipHash_Init(&pctx->ctx, key, 0, 0);
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}
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static int siphash_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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EVP_MD_CTX *mctx)
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{
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SIPHASH_PKEY_CTX *pctx = ctx->data;
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*siglen = SipHash_hash_size(&pctx->ctx);
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if (sig != NULL)
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return SipHash_Final(&pctx->ctx, sig, *siglen);
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return 1;
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}
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static int pkey_siphash_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
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const unsigned char *key;
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size_t len;
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switch (type) {
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case EVP_PKEY_CTRL_MD:
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/* ignore */
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break;
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case EVP_PKEY_CTRL_SET_DIGEST_SIZE:
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return SipHash_set_hash_size(&pctx->ctx, p1);
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case EVP_PKEY_CTRL_SET_MAC_KEY:
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case EVP_PKEY_CTRL_DIGESTINIT:
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if (type == EVP_PKEY_CTRL_SET_MAC_KEY) {
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/* user explicitly setting the key */
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key = p2;
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len = p1;
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} else {
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/* user indirectly setting the key via EVP_DigestSignInit */
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key = EVP_PKEY_get0_siphash(EVP_PKEY_CTX_get0_pkey(ctx), &len;;
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}
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if (key == NULL || len != SIPHASH_KEY_SIZE ||
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!ASN1_OCTET_STRING_set(&pctx->ktmp, key, len))
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return 0;
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/* use default rounds (2,4) */
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return SipHash_Init(&pctx->ctx, ASN1_STRING_get0_data(&pctx->ktmp),
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0, 0);
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default:
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return -2;
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}
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return 1;
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}
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static int pkey_siphash_ctrl_str(EVP_PKEY_CTX *ctx,
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const char *type, const char *value)
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{
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if (value == NULL)
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return 0;
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if (strcmp(type, "digestsize") == 0) {
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size_t hash_size = atoi(value);
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return pkey_siphash_ctrl(ctx, EVP_PKEY_CTRL_SET_DIGEST_SIZE, hash_size,
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NULL);
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}
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if (strcmp(type, "key") == 0)
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return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
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if (strcmp(type, "hexkey") == 0)
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return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
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return -2;
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}
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const EVP_PKEY_METHOD siphash_pkey_meth = {
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EVP_PKEY_SIPHASH,
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EVP_PKEY_FLAG_SIGCTX_CUSTOM, /* we don't deal with a separate MD */
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pkey_siphash_init,
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pkey_siphash_copy,
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pkey_siphash_cleanup,
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0, 0,
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0,
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pkey_siphash_keygen,
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0, 0,
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0, 0,
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0, 0,
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siphash_signctx_init,
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siphash_signctx,
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0, 0,
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0, 0,
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0, 0,
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0, 0,
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pkey_siphash_ctrl,
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pkey_siphash_ctrl_str
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};
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const EVP_PKEY_METHOD *siphash_pkey_method(void)
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{
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return &siphash_pkey_meth;
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}
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