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363b1e5dae
The new naming scheme consistently usese the `OSSL_FUNC_` prefix for all functions which are dispatched between the core and providers. This change includes in particular all up- and downcalls, i.e., the dispatched functions passed from core to provider and vice versa. - OSSL_core_ -> OSSL_FUNC_core_ - OSSL_provider_ -> OSSL_FUNC_core_ For operations and their function dispatch tables, the following convention is used: Type | Name (evp_generic_fetch(3)) | ---------------------|-----------------------------------| operation | OSSL_OP_FOO | function id | OSSL_FUNC_FOO_FUNCTION_NAME | function "name" | OSSL_FUNC_foo_function_name | function typedef | OSSL_FUNC_foo_function_name_fn | function ptr getter | OSSL_FUNC_foo_function_name | Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/12222)
744 lines
22 KiB
C
744 lines
22 KiB
C
/*
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* Copyright 2011-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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 <stdlib.h>
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#include <string.h>
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#include <openssl/crypto.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include <openssl/aes.h>
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#include "e_os.h" /* strcasecmp */
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#include "crypto/modes.h"
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#include "internal/thread_once.h"
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#include "prov/implementations.h"
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#include "prov/provider_ctx.h"
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#include "prov/providercommonerr.h"
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#include "drbg_local.h"
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static OSSL_FUNC_rand_newctx_fn drbg_ctr_new_wrapper;
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static OSSL_FUNC_rand_freectx_fn drbg_ctr_free;
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static OSSL_FUNC_rand_instantiate_fn drbg_ctr_instantiate_wrapper;
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static OSSL_FUNC_rand_uninstantiate_fn drbg_ctr_uninstantiate_wrapper;
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static OSSL_FUNC_rand_generate_fn drbg_ctr_generate_wrapper;
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static OSSL_FUNC_rand_reseed_fn drbg_ctr_reseed_wrapper;
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static OSSL_FUNC_rand_settable_ctx_params_fn drbg_ctr_settable_ctx_params;
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static OSSL_FUNC_rand_set_ctx_params_fn drbg_ctr_set_ctx_params;
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static OSSL_FUNC_rand_gettable_ctx_params_fn drbg_ctr_gettable_ctx_params;
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static OSSL_FUNC_rand_get_ctx_params_fn drbg_ctr_get_ctx_params;
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static OSSL_FUNC_rand_verify_zeroization_fn drbg_ctr_verify_zeroization;
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/*
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* The state of a DRBG AES-CTR.
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*/
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typedef struct rand_drbg_ctr_st {
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EVP_CIPHER_CTX *ctx_ecb;
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EVP_CIPHER_CTX *ctx_ctr;
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EVP_CIPHER_CTX *ctx_df;
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EVP_CIPHER *cipher_ecb;
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EVP_CIPHER *cipher_ctr;
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size_t keylen;
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int use_df;
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unsigned char K[32];
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unsigned char V[16];
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/* Temporary block storage used by ctr_df */
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unsigned char bltmp[16];
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size_t bltmp_pos;
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unsigned char KX[48];
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} PROV_DRBG_CTR;
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/*
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* Implementation of NIST SP 800-90A CTR DRBG.
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*/
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static void inc_128(PROV_DRBG_CTR *ctr)
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{
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unsigned char *p = &ctr->V[0];
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u32 n = 16, c = 1;
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do {
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--n;
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c += p[n];
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p[n] = (u8)c;
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c >>= 8;
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} while (n);
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}
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static void ctr_XOR(PROV_DRBG_CTR *ctr, const unsigned char *in, size_t inlen)
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{
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size_t i, n;
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if (in == NULL || inlen == 0)
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return;
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/*
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* Any zero padding will have no effect on the result as we
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* are XORing. So just process however much input we have.
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*/
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n = inlen < ctr->keylen ? inlen : ctr->keylen;
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for (i = 0; i < n; i++)
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ctr->K[i] ^= in[i];
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if (inlen <= ctr->keylen)
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return;
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n = inlen - ctr->keylen;
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if (n > 16) {
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/* Should never happen */
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n = 16;
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}
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for (i = 0; i < n; i++)
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ctr->V[i] ^= in[i + ctr->keylen];
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}
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/*
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* Process a complete block using BCC algorithm of SP 800-90A 10.3.3
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*/
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__owur static int ctr_BCC_block(PROV_DRBG_CTR *ctr, unsigned char *out,
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const unsigned char *in, int len)
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{
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int i, outlen = AES_BLOCK_SIZE;
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for (i = 0; i < len; i++)
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out[i] ^= in[i];
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if (!EVP_CipherUpdate(ctr->ctx_df, out, &outlen, out, len)
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|| outlen != len)
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return 0;
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return 1;
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}
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/*
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* Handle several BCC operations for as much data as we need for K and X
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*/
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__owur static int ctr_BCC_blocks(PROV_DRBG_CTR *ctr, const unsigned char *in)
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{
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unsigned char in_tmp[48];
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unsigned char num_of_blk = 2;
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memcpy(in_tmp, in, 16);
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memcpy(in_tmp + 16, in, 16);
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if (ctr->keylen != 16) {
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memcpy(in_tmp + 32, in, 16);
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num_of_blk = 3;
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}
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return ctr_BCC_block(ctr, ctr->KX, in_tmp, AES_BLOCK_SIZE * num_of_blk);
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}
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/*
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* Initialise BCC blocks: these have the value 0,1,2 in leftmost positions:
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* see 10.3.1 stage 7.
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*/
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__owur static int ctr_BCC_init(PROV_DRBG_CTR *ctr)
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{
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unsigned char bltmp[48] = {0};
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unsigned char num_of_blk;
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memset(ctr->KX, 0, 48);
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num_of_blk = ctr->keylen == 16 ? 2 : 3;
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bltmp[(AES_BLOCK_SIZE * 1) + 3] = 1;
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bltmp[(AES_BLOCK_SIZE * 2) + 3] = 2;
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return ctr_BCC_block(ctr, ctr->KX, bltmp, num_of_blk * AES_BLOCK_SIZE);
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}
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/*
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* Process several blocks into BCC algorithm, some possibly partial
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*/
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__owur static int ctr_BCC_update(PROV_DRBG_CTR *ctr,
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const unsigned char *in, size_t inlen)
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{
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if (in == NULL || inlen == 0)
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return 1;
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/* If we have partial block handle it first */
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if (ctr->bltmp_pos) {
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size_t left = 16 - ctr->bltmp_pos;
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/* If we now have a complete block process it */
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if (inlen >= left) {
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memcpy(ctr->bltmp + ctr->bltmp_pos, in, left);
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if (!ctr_BCC_blocks(ctr, ctr->bltmp))
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return 0;
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ctr->bltmp_pos = 0;
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inlen -= left;
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in += left;
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}
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}
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/* Process zero or more complete blocks */
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for (; inlen >= 16; in += 16, inlen -= 16) {
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if (!ctr_BCC_blocks(ctr, in))
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return 0;
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}
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/* Copy any remaining partial block to the temporary buffer */
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if (inlen > 0) {
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memcpy(ctr->bltmp + ctr->bltmp_pos, in, inlen);
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ctr->bltmp_pos += inlen;
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}
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return 1;
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}
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__owur static int ctr_BCC_final(PROV_DRBG_CTR *ctr)
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{
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if (ctr->bltmp_pos) {
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memset(ctr->bltmp + ctr->bltmp_pos, 0, 16 - ctr->bltmp_pos);
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if (!ctr_BCC_blocks(ctr, ctr->bltmp))
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return 0;
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}
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return 1;
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}
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__owur static int ctr_df(PROV_DRBG_CTR *ctr,
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const unsigned char *in1, size_t in1len,
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const unsigned char *in2, size_t in2len,
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const unsigned char *in3, size_t in3len)
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{
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static unsigned char c80 = 0x80;
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size_t inlen;
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unsigned char *p = ctr->bltmp;
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int outlen = AES_BLOCK_SIZE;
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if (!ctr_BCC_init(ctr))
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return 0;
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if (in1 == NULL)
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in1len = 0;
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if (in2 == NULL)
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in2len = 0;
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if (in3 == NULL)
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in3len = 0;
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inlen = in1len + in2len + in3len;
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/* Initialise L||N in temporary block */
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*p++ = (inlen >> 24) & 0xff;
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*p++ = (inlen >> 16) & 0xff;
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*p++ = (inlen >> 8) & 0xff;
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*p++ = inlen & 0xff;
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/* NB keylen is at most 32 bytes */
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*p++ = 0;
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*p++ = 0;
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*p++ = 0;
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*p = (unsigned char)((ctr->keylen + 16) & 0xff);
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ctr->bltmp_pos = 8;
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if (!ctr_BCC_update(ctr, in1, in1len)
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|| !ctr_BCC_update(ctr, in2, in2len)
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|| !ctr_BCC_update(ctr, in3, in3len)
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|| !ctr_BCC_update(ctr, &c80, 1)
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|| !ctr_BCC_final(ctr))
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return 0;
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/* Set up key K */
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if (!EVP_CipherInit_ex(ctr->ctx_ecb, NULL, NULL, ctr->KX, NULL, -1))
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return 0;
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/* X follows key K */
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if (!EVP_CipherUpdate(ctr->ctx_ecb, ctr->KX, &outlen, ctr->KX + ctr->keylen,
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AES_BLOCK_SIZE)
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|| outlen != AES_BLOCK_SIZE)
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return 0;
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if (!EVP_CipherUpdate(ctr->ctx_ecb, ctr->KX + 16, &outlen, ctr->KX,
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AES_BLOCK_SIZE)
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|| outlen != AES_BLOCK_SIZE)
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return 0;
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if (ctr->keylen != 16)
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if (!EVP_CipherUpdate(ctr->ctx_ecb, ctr->KX + 32, &outlen,
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ctr->KX + 16, AES_BLOCK_SIZE)
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|| outlen != AES_BLOCK_SIZE)
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return 0;
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return 1;
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}
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/*
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* NB the no-df Update in SP800-90A specifies a constant input length
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* of seedlen, however other uses of this algorithm pad the input with
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* zeroes if necessary and have up to two parameters XORed together,
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* so we handle both cases in this function instead.
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*/
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__owur static int ctr_update(PROV_DRBG *drbg,
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const unsigned char *in1, size_t in1len,
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const unsigned char *in2, size_t in2len,
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const unsigned char *nonce, size_t noncelen)
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{
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PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)drbg->data;
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int outlen = AES_BLOCK_SIZE;
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unsigned char V_tmp[48], out[48];
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unsigned char len;
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/* correct key is already set up. */
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memcpy(V_tmp, ctr->V, 16);
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inc_128(ctr);
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memcpy(V_tmp + 16, ctr->V, 16);
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if (ctr->keylen == 16) {
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len = 32;
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} else {
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inc_128(ctr);
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memcpy(V_tmp + 32, ctr->V, 16);
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len = 48;
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}
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if (!EVP_CipherUpdate(ctr->ctx_ecb, out, &outlen, V_tmp, len)
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|| outlen != len)
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return 0;
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memcpy(ctr->K, out, ctr->keylen);
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memcpy(ctr->V, out + ctr->keylen, 16);
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if (ctr->use_df) {
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/* If no input reuse existing derived value */
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if (in1 != NULL || nonce != NULL || in2 != NULL)
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if (!ctr_df(ctr, in1, in1len, nonce, noncelen, in2, in2len))
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return 0;
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/* If this a reuse input in1len != 0 */
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if (in1len)
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ctr_XOR(ctr, ctr->KX, drbg->seedlen);
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} else {
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ctr_XOR(ctr, in1, in1len);
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ctr_XOR(ctr, in2, in2len);
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}
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if (!EVP_CipherInit_ex(ctr->ctx_ecb, NULL, NULL, ctr->K, NULL, -1)
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|| !EVP_CipherInit_ex(ctr->ctx_ctr, NULL, NULL, ctr->K, NULL, -1))
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return 0;
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return 1;
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}
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static int drbg_ctr_instantiate(PROV_DRBG *drbg,
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const unsigned char *entropy, size_t entropylen,
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const unsigned char *nonce, size_t noncelen,
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const unsigned char *pers, size_t perslen)
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{
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PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)drbg->data;
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if (entropy == NULL)
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return 0;
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memset(ctr->K, 0, sizeof(ctr->K));
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memset(ctr->V, 0, sizeof(ctr->V));
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if (!EVP_CipherInit_ex(ctr->ctx_ecb, NULL, NULL, ctr->K, NULL, -1))
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return 0;
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inc_128(ctr);
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if (!ctr_update(drbg, entropy, entropylen, pers, perslen, nonce, noncelen))
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return 0;
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return 1;
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}
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static int drbg_ctr_instantiate_wrapper(void *vdrbg, unsigned int strength,
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int prediction_resistance,
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const unsigned char *pstr,
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size_t pstr_len)
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{
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PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
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return PROV_DRBG_instantiate(drbg, strength, prediction_resistance,
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pstr, pstr_len);
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}
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static int drbg_ctr_reseed(PROV_DRBG *drbg,
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const unsigned char *entropy, size_t entropylen,
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const unsigned char *adin, size_t adinlen)
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{
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PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)drbg->data;
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if (entropy == NULL)
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return 0;
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inc_128(ctr);
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if (!ctr_update(drbg, entropy, entropylen, adin, adinlen, NULL, 0))
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return 0;
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return 1;
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}
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static int drbg_ctr_reseed_wrapper(void *vdrbg, int prediction_resistance,
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const unsigned char *ent, size_t ent_len,
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const unsigned char *adin, size_t adin_len)
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{
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PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
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return PROV_DRBG_reseed(drbg, prediction_resistance, ent, ent_len,
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adin, adin_len);
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}
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static void ctr96_inc(unsigned char *counter)
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{
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u32 n = 12, c = 1;
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do {
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--n;
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c += counter[n];
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counter[n] = (u8)c;
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c >>= 8;
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} while (n);
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}
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static int drbg_ctr_generate(PROV_DRBG *drbg,
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unsigned char *out, size_t outlen,
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const unsigned char *adin, size_t adinlen)
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{
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PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)drbg->data;
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unsigned int ctr32, blocks;
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int outl, buflen;
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if (adin != NULL && adinlen != 0) {
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inc_128(ctr);
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if (!ctr_update(drbg, adin, adinlen, NULL, 0, NULL, 0))
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return 0;
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/* This means we reuse derived value */
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if (ctr->use_df) {
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adin = NULL;
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adinlen = 1;
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}
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} else {
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adinlen = 0;
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}
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inc_128(ctr);
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if (outlen == 0) {
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inc_128(ctr);
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if (!ctr_update(drbg, adin, adinlen, NULL, 0, NULL, 0))
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return 0;
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return 1;
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}
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memset(out, 0, outlen);
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do {
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if (!EVP_CipherInit_ex(ctr->ctx_ctr,
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NULL, NULL, NULL, ctr->V, -1))
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return 0;
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/*-
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* outlen has type size_t while EVP_CipherUpdate takes an
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* int argument and thus cannot be guaranteed to process more
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* than 2^31-1 bytes at a time. We process such huge generate
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* requests in 2^30 byte chunks, which is the greatest multiple
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* of AES block size lower than or equal to 2^31-1.
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*/
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buflen = outlen > (1U << 30) ? (1U << 30) : outlen;
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blocks = (buflen + 15) / 16;
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ctr32 = GETU32(ctr->V + 12) + blocks;
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if (ctr32 < blocks) {
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/* 32-bit counter overflow into V. */
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if (ctr32 != 0) {
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blocks -= ctr32;
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buflen = blocks * 16;
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ctr32 = 0;
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}
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ctr96_inc(ctr->V);
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}
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PUTU32(ctr->V + 12, ctr32);
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if (!EVP_CipherUpdate(ctr->ctx_ctr, out, &outl, out, buflen)
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|| outl != buflen)
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return 0;
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out += buflen;
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outlen -= buflen;
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} while (outlen);
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if (!ctr_update(drbg, adin, adinlen, NULL, 0, NULL, 0))
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return 0;
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return 1;
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}
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static int drbg_ctr_generate_wrapper
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(void *vdrbg, unsigned char *out, size_t outlen,
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unsigned int strength, int prediction_resistance,
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const unsigned char *adin, size_t adin_len)
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{
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PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
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return PROV_DRBG_generate(drbg, out, outlen, strength,
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prediction_resistance, adin, adin_len);
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}
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static int drbg_ctr_uninstantiate(PROV_DRBG *drbg)
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{
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PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)drbg->data;
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OPENSSL_cleanse(ctr->K, sizeof(ctr->K));
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OPENSSL_cleanse(ctr->V, sizeof(ctr->V));
|
|
OPENSSL_cleanse(ctr->bltmp, sizeof(ctr->bltmp));
|
|
OPENSSL_cleanse(ctr->KX, sizeof(ctr->KX));
|
|
ctr->bltmp_pos = 0;
|
|
return PROV_DRBG_uninstantiate(drbg);
|
|
}
|
|
|
|
static int drbg_ctr_uninstantiate_wrapper(void *vdrbg)
|
|
{
|
|
return drbg_ctr_uninstantiate((PROV_DRBG *)vdrbg);
|
|
}
|
|
|
|
static int drbg_ctr_verify_zeroization(void *vdrbg)
|
|
{
|
|
PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
|
|
PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)drbg->data;
|
|
|
|
PROV_DRBG_VERYIFY_ZEROIZATION(ctr->K);
|
|
PROV_DRBG_VERYIFY_ZEROIZATION(ctr->V);
|
|
PROV_DRBG_VERYIFY_ZEROIZATION(ctr->bltmp);
|
|
PROV_DRBG_VERYIFY_ZEROIZATION(ctr->KX);
|
|
if (ctr->bltmp_pos != 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int drbg_ctr_init_lengths(PROV_DRBG *drbg)
|
|
{
|
|
PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)drbg->data;
|
|
int res = 1;
|
|
|
|
#ifdef FIPS_MODULE
|
|
if (!ctr->use_df) {
|
|
PROVerr(0, RAND_R_DERIVATION_FUNCTION_MANDATORY_FOR_FIPS);
|
|
ctr->use_df = 1;
|
|
res = 0;
|
|
}
|
|
#endif
|
|
/* Maximum number of bits per request = 2^19 = 2^16 bytes */
|
|
drbg->max_request = 1 << 16;
|
|
if (ctr->use_df) {
|
|
drbg->min_entropylen = 0;
|
|
drbg->max_entropylen = DRBG_MAX_LENGTH;
|
|
drbg->min_noncelen = 0;
|
|
drbg->max_noncelen = DRBG_MAX_LENGTH;
|
|
drbg->max_perslen = DRBG_MAX_LENGTH;
|
|
drbg->max_adinlen = DRBG_MAX_LENGTH;
|
|
|
|
if (ctr->keylen > 0) {
|
|
drbg->min_entropylen = ctr->keylen;
|
|
drbg->min_noncelen = drbg->min_entropylen / 2;
|
|
}
|
|
} else {
|
|
const size_t len = ctr->keylen > 0 ? drbg->seedlen : DRBG_MAX_LENGTH;
|
|
|
|
drbg->min_entropylen = len;
|
|
drbg->max_entropylen = len;
|
|
/* Nonce not used */
|
|
drbg->min_noncelen = 0;
|
|
drbg->max_noncelen = 0;
|
|
drbg->max_perslen = len;
|
|
drbg->max_adinlen = len;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static int drbg_ctr_init(PROV_DRBG *drbg)
|
|
{
|
|
PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)drbg->data;
|
|
const size_t keylen = EVP_CIPHER_key_length(ctr->cipher_ctr);
|
|
|
|
ctr->keylen = keylen;
|
|
if (ctr->ctx_ecb == NULL)
|
|
ctr->ctx_ecb = EVP_CIPHER_CTX_new();
|
|
if (ctr->ctx_ctr == NULL)
|
|
ctr->ctx_ctr = EVP_CIPHER_CTX_new();
|
|
if (ctr->ctx_ecb == NULL || ctr->ctx_ctr == NULL) {
|
|
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (ctr->cipher_ctr != NULL) {
|
|
if (!EVP_CipherInit_ex(ctr->ctx_ecb,
|
|
ctr->cipher_ecb, NULL, NULL, NULL, 1)
|
|
|| !EVP_CipherInit_ex(ctr->ctx_ctr,
|
|
ctr->cipher_ctr, NULL, NULL, NULL, 1)) {
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_UNABLE_TO_INITIALISE_CIPHERS);
|
|
goto err;
|
|
}
|
|
|
|
drbg->strength = keylen * 8;
|
|
drbg->seedlen = keylen + 16;
|
|
|
|
if (ctr->use_df) {
|
|
/* df initialisation */
|
|
static const unsigned char df_key[32] = {
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
|
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
|
|
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
|
|
};
|
|
|
|
if (ctr->ctx_df == NULL)
|
|
ctr->ctx_df = EVP_CIPHER_CTX_new();
|
|
if (ctr->ctx_df == NULL) {
|
|
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
/* Set key schedule for df_key */
|
|
if (!EVP_CipherInit_ex(ctr->ctx_df,
|
|
ctr->cipher_ecb, NULL, df_key, NULL, 1)) {
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_DERIVATION_FUNCTION_INIT_FAILED);
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
return drbg_ctr_init_lengths(drbg);
|
|
|
|
err:
|
|
EVP_CIPHER_CTX_free(ctr->ctx_ecb);
|
|
EVP_CIPHER_CTX_free(ctr->ctx_ctr);
|
|
ctr->ctx_ecb = ctr->ctx_ctr = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int drbg_ctr_new(PROV_DRBG *drbg)
|
|
{
|
|
PROV_DRBG_CTR *ctr;
|
|
|
|
ctr = OPENSSL_secure_zalloc(sizeof(*ctr));
|
|
if (ctr == NULL) {
|
|
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
|
|
ctr->use_df = 1;
|
|
drbg->data = ctr;
|
|
return drbg_ctr_init_lengths(drbg);
|
|
}
|
|
|
|
static void *drbg_ctr_new_wrapper(void *provctx, void *parent,
|
|
const OSSL_DISPATCH *parent_dispatch)
|
|
{
|
|
return prov_rand_drbg_new(provctx, parent, parent_dispatch, &drbg_ctr_new,
|
|
&drbg_ctr_instantiate, &drbg_ctr_uninstantiate,
|
|
&drbg_ctr_reseed, &drbg_ctr_generate);
|
|
}
|
|
|
|
static void drbg_ctr_free(void *vdrbg)
|
|
{
|
|
PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
|
|
PROV_DRBG_CTR *ctr;
|
|
|
|
if (drbg != NULL && (ctr = (PROV_DRBG_CTR *)drbg->data) != NULL) {
|
|
EVP_CIPHER_CTX_free(ctr->ctx_ecb);
|
|
EVP_CIPHER_CTX_free(ctr->ctx_ctr);
|
|
EVP_CIPHER_CTX_free(ctr->ctx_df);
|
|
EVP_CIPHER_free(ctr->cipher_ecb);
|
|
EVP_CIPHER_free(ctr->cipher_ctr);
|
|
|
|
OPENSSL_secure_clear_free(ctr, sizeof(*ctr));
|
|
}
|
|
prov_rand_drbg_free(drbg);
|
|
}
|
|
|
|
static int drbg_ctr_get_ctx_params(void *vdrbg, OSSL_PARAM params[])
|
|
{
|
|
PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
|
|
|
|
return drbg_get_ctx_params(drbg, params);
|
|
}
|
|
|
|
static const OSSL_PARAM *drbg_ctr_gettable_ctx_params(void)
|
|
{
|
|
static const OSSL_PARAM known_gettable_ctx_params[] = {
|
|
OSSL_PARAM_DRBG_GETABLE_CTX_COMMON,
|
|
OSSL_PARAM_END
|
|
};
|
|
return known_gettable_ctx_params;
|
|
}
|
|
|
|
static int drbg_ctr_set_ctx_params(void *vctx, const OSSL_PARAM params[])
|
|
{
|
|
PROV_DRBG *ctx = (PROV_DRBG *)vctx;
|
|
PROV_DRBG_CTR *ctr = (PROV_DRBG_CTR *)ctx->data;
|
|
OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx);
|
|
const OSSL_PARAM *p;
|
|
char *ecb;
|
|
const char *propquery = NULL;
|
|
int i, cipher_init = 0;
|
|
|
|
if ((p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_USE_DF)) != NULL
|
|
&& OSSL_PARAM_get_int(p, &i)) {
|
|
/* FIPS errors out in the drbg_ctr_init() call later */
|
|
ctr->use_df = i != 0;
|
|
cipher_init = 1;
|
|
}
|
|
|
|
if ((p = OSSL_PARAM_locate_const(params,
|
|
OSSL_DRBG_PARAM_PROPERTIES)) != NULL) {
|
|
if (p->data_type != OSSL_PARAM_UTF8_STRING)
|
|
return 0;
|
|
propquery = (const char *)p->data;
|
|
}
|
|
|
|
if ((p = OSSL_PARAM_locate_const(params, OSSL_DRBG_PARAM_CIPHER)) != NULL) {
|
|
const char *base = (const char *)p->data;
|
|
|
|
if (p->data_type != OSSL_PARAM_UTF8_STRING
|
|
|| p->data_size < 3)
|
|
return 0;
|
|
if (strcasecmp("CTR", base + p->data_size - sizeof("CTR")) != 0) {
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_REQUIRE_CTR_MODE_CIPHER);
|
|
return 0;
|
|
}
|
|
if ((ecb = OPENSSL_strdup(base)) == NULL) {
|
|
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
strcpy(ecb + p->data_size - sizeof("ECB"), "ECB");
|
|
EVP_CIPHER_free(ctr->cipher_ecb);
|
|
EVP_CIPHER_free(ctr->cipher_ctr);
|
|
ctr->cipher_ctr = EVP_CIPHER_fetch(libctx, base, propquery);
|
|
ctr->cipher_ecb = EVP_CIPHER_fetch(libctx, ecb, propquery);
|
|
OPENSSL_free(ecb);
|
|
if (ctr->cipher_ctr == NULL || ctr->cipher_ecb == NULL) {
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_UNABLE_TO_FIND_CIPHERS);
|
|
return 0;
|
|
}
|
|
cipher_init = 1;
|
|
}
|
|
|
|
if (cipher_init && !drbg_ctr_init(ctx))
|
|
return 0;
|
|
|
|
return drbg_set_ctx_params(ctx, params);
|
|
}
|
|
|
|
static const OSSL_PARAM *drbg_ctr_settable_ctx_params(void)
|
|
{
|
|
static const OSSL_PARAM known_settable_ctx_params[] = {
|
|
OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_PROPERTIES, NULL, 0),
|
|
OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_CIPHER, NULL, 0),
|
|
#ifndef FIPS_MODULE
|
|
/*
|
|
* Don't advertise this for FIPS, it isn't allowed to change.
|
|
* The parameter can still be passed and will be processed but errors
|
|
* out.
|
|
*/
|
|
OSSL_PARAM_int(OSSL_DRBG_PARAM_USE_DF, NULL),
|
|
#endif
|
|
OSSL_PARAM_DRBG_SETABLE_CTX_COMMON,
|
|
OSSL_PARAM_END
|
|
};
|
|
return known_settable_ctx_params;
|
|
}
|
|
|
|
const OSSL_DISPATCH drbg_ctr_functions[] = {
|
|
{ OSSL_FUNC_RAND_NEWCTX, (void(*)(void))drbg_ctr_new_wrapper },
|
|
{ OSSL_FUNC_RAND_FREECTX, (void(*)(void))drbg_ctr_free },
|
|
{ OSSL_FUNC_RAND_INSTANTIATE,
|
|
(void(*)(void))drbg_ctr_instantiate_wrapper },
|
|
{ OSSL_FUNC_RAND_UNINSTANTIATE,
|
|
(void(*)(void))drbg_ctr_uninstantiate_wrapper },
|
|
{ OSSL_FUNC_RAND_GENERATE, (void(*)(void))drbg_ctr_generate_wrapper },
|
|
{ OSSL_FUNC_RAND_RESEED, (void(*)(void))drbg_ctr_reseed_wrapper },
|
|
{ OSSL_FUNC_RAND_ENABLE_LOCKING, (void(*)(void))drbg_enable_locking },
|
|
{ OSSL_FUNC_RAND_LOCK, (void(*)(void))drbg_lock },
|
|
{ OSSL_FUNC_RAND_UNLOCK, (void(*)(void))drbg_unlock },
|
|
{ OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS,
|
|
(void(*)(void))drbg_ctr_settable_ctx_params },
|
|
{ OSSL_FUNC_RAND_SET_CTX_PARAMS, (void(*)(void))drbg_ctr_set_ctx_params },
|
|
{ OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS,
|
|
(void(*)(void))drbg_ctr_gettable_ctx_params },
|
|
{ OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))drbg_ctr_get_ctx_params },
|
|
{ OSSL_FUNC_RAND_SET_CALLBACKS, (void(*)(void))drbg_set_callbacks },
|
|
{ OSSL_FUNC_RAND_VERIFY_ZEROIZATION,
|
|
(void(*)(void))drbg_ctr_verify_zeroization },
|
|
{ 0, NULL }
|
|
};
|