466 lines
13 KiB
C
466 lines
13 KiB
C
/*
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* Copyright (c) 2019 Dmitry Belyavskiy <beldmit@gmail.com>
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* Copyright (c) 2020 Vitaly Chikunov <vt@altlinux.org>
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*
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* Contents licensed under the terms of the OpenSSL license
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* See https://www.openssl.org/source/license.html for details
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*/
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#include <string.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/buffer.h>
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#include "gost_lcl.h"
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#include "e_gost_err.h"
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static uint32_t be32(uint32_t host)
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{
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#ifdef L_ENDIAN
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return (host & 0xff000000) >> 24 |
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(host & 0x00ff0000) >> 8 |
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(host & 0x0000ff00) << 8 |
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(host & 0x000000ff) << 24;
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#else
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return host;
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#endif
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}
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int omac_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr);
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/*
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* Function expects that out is a preallocated buffer of length
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* defined as sum of shared_len and mac length defined by mac_nid
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* */
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int gost_kexp15(const unsigned char *shared_key, const int shared_len,
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int cipher_nid, const unsigned char *cipher_key,
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int mac_nid, unsigned char *mac_key,
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const unsigned char *iv, const size_t ivlen,
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unsigned char *out, int *out_len)
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{
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unsigned char iv_full[16], mac_buf[16];
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unsigned int mac_len;
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EVP_CIPHER_CTX *ciph = NULL;
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EVP_MD_CTX *mac = NULL;
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int ret = 0;
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int len;
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mac_len = (cipher_nid == NID_magma_ctr) ? 8 :
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(cipher_nid == NID_grasshopper_ctr) ? 16 : 0;
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if (mac_len == 0) {
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GOSTerr(GOST_F_GOST_KEXP15, GOST_R_INVALID_CIPHER);
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goto err;
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}
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if (shared_len + mac_len > (unsigned int)(*out_len)) {
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GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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/* we expect IV of half length */
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memset(iv_full, 0, 16);
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memcpy(iv_full, iv, ivlen);
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mac = EVP_MD_CTX_new();
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if (mac == NULL) {
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GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
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|| omac_imit_ctrl(mac, EVP_MD_CTRL_SET_KEY, 32, mac_key) <= 0
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|| omac_imit_ctrl(mac, EVP_MD_CTRL_XOF_LEN, mac_len, NULL) <= 0
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|| EVP_DigestUpdate(mac, iv, ivlen) <= 0
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|| EVP_DigestUpdate(mac, shared_key, shared_len) <= 0
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/* As we set MAC length directly, we should not allow overwriting it */
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|| EVP_DigestFinalXOF(mac, mac_buf, mac_len) <= 0) {
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GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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ciph = EVP_CIPHER_CTX_new();
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if (ciph == NULL) {
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GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_CipherInit_ex
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(ciph, EVP_get_cipherbynid(cipher_nid), NULL, NULL, NULL, 1) <= 0
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|| EVP_CipherInit_ex(ciph, NULL, NULL, cipher_key, iv_full, 1) <= 0
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|| EVP_CipherUpdate(ciph, out, &len, shared_key, shared_len) <= 0
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|| EVP_CipherUpdate(ciph, out + shared_len, &len, mac_buf, mac_len) <= 0
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|| EVP_CipherFinal_ex(ciph, out + shared_len + len, out_len) <= 0) {
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GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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*out_len = shared_len + mac_len;
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ret = 1;
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err:
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OPENSSL_cleanse(mac_buf, mac_len);
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EVP_MD_CTX_free(mac);
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EVP_CIPHER_CTX_free(ciph);
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return ret;
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}
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/*
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* Function expects that shared_key is a preallocated buffer
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* with length defined as expkeylen + mac_len defined by mac_nid
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* */
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int gost_kimp15(const unsigned char *expkey, const size_t expkeylen,
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int cipher_nid, const unsigned char *cipher_key,
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int mac_nid, unsigned char *mac_key,
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const unsigned char *iv, const size_t ivlen,
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unsigned char *shared_key)
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{
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unsigned char iv_full[16], out[48], mac_buf[16];
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unsigned int mac_len;
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const size_t shared_len = 32;
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EVP_CIPHER_CTX *ciph = NULL;
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EVP_MD_CTX *mac = NULL;
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int ret = 0;
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int len;
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mac_len = (cipher_nid == NID_magma_ctr) ? 8 :
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(cipher_nid == NID_grasshopper_ctr) ? 16 : 0;
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if (mac_len == 0) {
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GOSTerr(GOST_F_GOST_KIMP15, GOST_R_INVALID_CIPHER);
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goto err;
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}
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if (expkeylen > sizeof(out)) {
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GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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if (ivlen > 16) {
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GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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/* we expect IV of half length */
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memset(iv_full, 0, 16);
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memcpy(iv_full, iv, ivlen);
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ciph = EVP_CIPHER_CTX_new();
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if (ciph == NULL) {
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GOSTerr(GOST_F_GOST_KIMP15, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_CipherInit_ex
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(ciph, EVP_get_cipherbynid(cipher_nid), NULL, NULL, NULL, 0) <= 0
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|| EVP_CipherInit_ex(ciph, NULL, NULL, cipher_key, iv_full, 0) <= 0
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|| EVP_CipherUpdate(ciph, out, &len, expkey, expkeylen) <= 0
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|| EVP_CipherFinal_ex(ciph, out + len, &len) <= 0) {
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GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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/*Now we have shared key and mac in out[] */
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mac = EVP_MD_CTX_new();
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if (mac == NULL) {
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GOSTerr(GOST_F_GOST_KIMP15, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
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|| omac_imit_ctrl(mac, EVP_MD_CTRL_SET_KEY, 32, mac_key) <= 0
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|| omac_imit_ctrl(mac, EVP_MD_CTRL_XOF_LEN, mac_len, NULL) <= 0
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|| EVP_DigestUpdate(mac, iv, ivlen) <= 0
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|| EVP_DigestUpdate(mac, out, shared_len) <= 0
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/* As we set MAC length directly, we should not allow overwriting it */
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|| EVP_DigestFinalXOF(mac, mac_buf, mac_len) <= 0) {
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GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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if (CRYPTO_memcmp(mac_buf, out + shared_len, mac_len) != 0) {
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GOSTerr(GOST_F_GOST_KIMP15, GOST_R_BAD_MAC);
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goto err;
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}
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memcpy(shared_key, out, shared_len);
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ret = 1;
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err:
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OPENSSL_cleanse(out, sizeof(out));
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EVP_MD_CTX_free(mac);
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EVP_CIPHER_CTX_free(ciph);
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return ret;
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}
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int gost_kdftree2012_256(unsigned char *keyout, size_t keyout_len,
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const unsigned char *key, size_t keylen,
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const unsigned char *label, size_t label_len,
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const unsigned char *seed, size_t seed_len,
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const size_t representation)
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{
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int iters, i = 0;
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unsigned char zero = 0;
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unsigned char *ptr = keyout;
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HMAC_CTX *ctx;
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unsigned char *len_ptr = NULL;
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uint32_t len_repr = be32(keyout_len * 8);
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size_t len_repr_len = 4;
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ctx = HMAC_CTX_new();
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if (ctx == NULL) {
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GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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if ((keyout_len == 0) || (keyout_len % 32 != 0)) {
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GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_INTERNAL_ERROR);
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return 0;
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}
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iters = keyout_len / 32;
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len_ptr = (unsigned char *)&len_repr;
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while (*len_ptr == 0) {
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len_ptr++;
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len_repr_len--;
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}
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for (i = 1; i <= iters; i++) {
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uint32_t iter_net = be32(i);
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unsigned char *rep_ptr =
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((unsigned char *)&iter_net) + (4 - representation);
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if (HMAC_Init_ex(ctx, key, keylen,
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EVP_get_digestbynid(NID_id_GostR3411_2012_256),
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NULL) <= 0
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|| HMAC_Update(ctx, rep_ptr, representation) <= 0
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|| HMAC_Update(ctx, label, label_len) <= 0
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|| HMAC_Update(ctx, &zero, 1) <= 0
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|| HMAC_Update(ctx, seed, seed_len) <= 0
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|| HMAC_Update(ctx, len_ptr, len_repr_len) <= 0
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|| HMAC_Final(ctx, ptr, NULL) <= 0) {
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GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_INTERNAL_ERROR);
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HMAC_CTX_free(ctx);
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return 0;
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}
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HMAC_CTX_reset(ctx);
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ptr += 32;
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}
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HMAC_CTX_free(ctx);
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return 1;
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}
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int gost_tlstree(int cipher_nid, const unsigned char *in, unsigned char *out,
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const unsigned char *tlsseq)
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{
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uint64_t gh_c1 = 0x00000000FFFFFFFF, gh_c2 = 0x0000F8FFFFFFFFFF,
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gh_c3 = 0xC0FFFFFFFFFFFFFF;
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uint64_t mg_c1 = 0x00000000C0FFFFFF, mg_c2 = 0x000000FEFFFFFFFF,
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mg_c3 = 0x00F0FFFFFFFFFFFF;
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uint64_t c1, c2, c3;
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uint64_t seed1, seed2, seed3;
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uint64_t seq;
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unsigned char ko1[32], ko2[32];
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switch (cipher_nid) {
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case NID_magma_cbc:
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c1 = mg_c1;
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c2 = mg_c2;
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c3 = mg_c3;
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break;
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case NID_grasshopper_cbc:
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c1 = gh_c1;
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c2 = gh_c2;
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c3 = gh_c3;
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break;
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default:
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return 0;
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}
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#ifndef L_ENDIAN
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BUF_reverse((unsigned char *)&seq, tlsseq, 8);
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#else
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memcpy(&seq, tlsseq, 8);
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#endif
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seed1 = seq & c1;
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seed2 = seq & c2;
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seed3 = seq & c3;
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if (gost_kdftree2012_256(ko1, 32, in, 32, (const unsigned char *)"level1", 6,
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(const unsigned char *)&seed1, 8, 1) <= 0
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|| gost_kdftree2012_256(ko2, 32, ko1, 32, (const unsigned char *)"level2", 6,
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(const unsigned char *)&seed2, 8, 1) <= 0
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|| gost_kdftree2012_256(out, 32, ko2, 32, (const unsigned char *)"level3", 6,
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(const unsigned char *)&seed3, 8, 1) <= 0)
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return 0;
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return 1;
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}
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#define GOST_WRAP_FLAGS EVP_CIPH_CTRL_INIT | EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | EVP_CIPH_FLAG_DEFAULT_ASN1
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#define MAGMA_MAC_WRAP_LEN 8
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#define KUZNYECHIK_MAC_WRAP_LEN 16
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#define MAX_MAC_WRAP_LEN KUZNYECHIK_MAC_WRAP_LEN
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#define GOSTKEYLEN 32
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#define MAGMA_WRAPPED_KEY_LEN GOSTKEYLEN + MAGMA_MAC_WRAP_LEN
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#define KUZNYECHIK_WRAPPED_KEY_LEN GOSTKEYLEN + KUZNYECHIK_MAC_WRAP_LEN
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#define MAX_WRAPPED_KEY_LEN KUZNYECHIK_WRAPPED_KEY_LEN
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typedef struct {
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unsigned char iv[8]; /* Max IV size is half of base cipher block length */
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unsigned char key[GOSTKEYLEN*2]; /* Combined cipher and mac keys */
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unsigned char wrapped[MAX_WRAPPED_KEY_LEN]; /* Max size */
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size_t wrap_count;
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} GOST_WRAP_CTX;
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static int magma_wrap_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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GOST_WRAP_CTX *cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
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memset(cctx->wrapped, 0, MAX_WRAPPED_KEY_LEN);
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cctx->wrap_count = 0;
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if (iv) {
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memset(cctx->iv, 0, 8);
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memcpy(cctx->iv, iv, 4);
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}
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if (key) {
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memcpy(cctx->key, key, GOSTKEYLEN*2);
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}
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return 1;
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}
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static int magma_wrap_do(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t inl)
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{
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GOST_WRAP_CTX *cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
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int enc = EVP_CIPHER_CTX_encrypting(ctx) ? 1 : 0;
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if (out == NULL)
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return GOSTKEYLEN;
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if (inl <= MAGMA_WRAPPED_KEY_LEN) {
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if (cctx->wrap_count + inl > MAGMA_WRAPPED_KEY_LEN)
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return -1;
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if (cctx->wrap_count + inl <= MAGMA_WRAPPED_KEY_LEN)
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{
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memcpy(cctx->wrapped+cctx->wrap_count, in, inl);
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cctx->wrap_count += inl;
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}
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}
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if (cctx->wrap_count < MAGMA_WRAPPED_KEY_LEN)
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return 0;
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if (enc) {
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#if 0
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return gost_kexp15(cctx->key, 32, NID_magma_ctr, in, NID_magma_mac,
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cctx->key, /* FIXME mac_key, */ cctx->iv, 4, out, &outl);
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#endif
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return -1;
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} else {
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return gost_kimp15(cctx->wrapped, cctx->wrap_count, NID_magma_ctr,
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cctx->key+GOSTKEYLEN, NID_magma_mac, cctx->key, cctx->iv, 4, out) > 0 ? GOSTKEYLEN : 0;
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}
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}
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static int kuznyechik_wrap_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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GOST_WRAP_CTX *cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
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memset(cctx->wrapped, 0, KUZNYECHIK_WRAPPED_KEY_LEN);
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cctx->wrap_count = 0;
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if (iv) {
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memset(cctx->iv, 0, 8);
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memcpy(cctx->iv, iv, 8);
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}
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if (key) {
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memcpy(cctx->key, key, GOSTKEYLEN*2);
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}
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return 1;
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}
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static int kuznyechik_wrap_do(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t inl)
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{
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GOST_WRAP_CTX *cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
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int enc = EVP_CIPHER_CTX_encrypting(ctx) ? 1 : 0;
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if (out == NULL)
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return GOSTKEYLEN;
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if (inl <= KUZNYECHIK_WRAPPED_KEY_LEN) {
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if (cctx->wrap_count + inl > KUZNYECHIK_WRAPPED_KEY_LEN)
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return -1;
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if (cctx->wrap_count + inl <= KUZNYECHIK_WRAPPED_KEY_LEN)
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{
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memcpy(cctx->wrapped+cctx->wrap_count, in, inl);
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cctx->wrap_count += inl;
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}
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}
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if (cctx->wrap_count < KUZNYECHIK_WRAPPED_KEY_LEN)
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return 0;
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if (enc) {
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#if 0
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return gost_kexp15(cctx->key, 32, NID_magma_ctr, in, NID_magma_mac,
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cctx->key, /* FIXME mac_key, */ cctx->iv, 4, out, &outl);
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#endif
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return -1;
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} else {
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return gost_kimp15(cctx->wrapped, cctx->wrap_count, NID_kuznyechik_ctr,
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cctx->key+GOSTKEYLEN, NID_kuznyechik_mac, cctx->key, cctx->iv, 8, out) > 0 ? GOSTKEYLEN : 0;
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}
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}
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static int wrap_ctrl (EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
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{
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switch(type)
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{
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case EVP_CTRL_INIT:
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EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
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return 1;
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default:
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return -2;
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}
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}
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static GOST_cipher wrap_template_cipher = {
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.key_len = GOSTKEYLEN * 2,
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.flags = GOST_WRAP_FLAGS,
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.ctx_size = sizeof(GOST_WRAP_CTX),
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.ctrl = wrap_ctrl,
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};
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GOST_cipher magma_kexp15_cipher = {
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.template = &wrap_template_cipher,
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.nid = NID_magma_kexp15,
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.block_size = 8,
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.iv_len = 4,
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.init = magma_wrap_init,
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.do_cipher = magma_wrap_do,
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};
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GOST_cipher kuznyechik_kexp15_cipher = {
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.template = &wrap_template_cipher,
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.nid = NID_kuznyechik_kexp15,
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.block_size = 16,
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.iv_len = 8,
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.init = kuznyechik_wrap_init,
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.do_cipher = kuznyechik_wrap_do,
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};
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/* vim: set expandtab cinoptions=\:0,l1,t0,g0,(0 sw=4 : */
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