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