diff options
Diffstat (limited to 'openssl/engines/ccgost/gost_crypt.c')
| -rw-r--r-- | openssl/engines/ccgost/gost_crypt.c | 623 |
1 files changed, 623 insertions, 0 deletions
diff --git a/openssl/engines/ccgost/gost_crypt.c b/openssl/engines/ccgost/gost_crypt.c new file mode 100644 index 0000000..2bbdc6c --- /dev/null +++ b/openssl/engines/ccgost/gost_crypt.c @@ -0,0 +1,623 @@ +/********************************************************************** + * gost_crypt.c * + * Copyright (c) 2005-2006 Cryptocom LTD * + * This file is distributed under the same license as OpenSSL * + * * + * OpenSSL interface to GOST 28147-89 cipher functions * + * Requires OpenSSL 0.9.9 for compilation * + **********************************************************************/ +#include <string.h> +#include "gost89.h" +#include <openssl/rand.h> +#include "e_gost_err.h" +#include "gost_lcl.h" + +#if !defined(CCGOST_DEBUG) && !defined(DEBUG) +# ifndef NDEBUG +# define NDEBUG +# endif +#endif +#include <assert.h> + +static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc); +static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc); +/* Handles block of data in CFB mode */ +static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, size_t inl); +/* Handles block of data in CNT mode */ +static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, size_t inl); +/* Cleanup function */ +static int gost_cipher_cleanup(EVP_CIPHER_CTX *); +/* set/get cipher parameters */ +static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params); +static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params); +/* Control function */ +static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr); + +EVP_CIPHER cipher_gost = { + NID_id_Gost28147_89, + 1, /* block_size */ + 32, /* key_size */ + 8, /* iv_len */ + EVP_CIPH_CFB_MODE | EVP_CIPH_NO_PADDING | + EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT, + gost_cipher_init, + gost_cipher_do_cfb, + gost_cipher_cleanup, + sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */ + gost89_set_asn1_parameters, + gost89_get_asn1_parameters, + gost_cipher_ctl, + NULL, +}; + +EVP_CIPHER cipher_gost_cpacnt = { + NID_gost89_cnt, + 1, /* block_size */ + 32, /* key_size */ + 8, /* iv_len */ + EVP_CIPH_OFB_MODE | EVP_CIPH_NO_PADDING | + EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT, + gost_cipher_init_cpa, + gost_cipher_do_cnt, + gost_cipher_cleanup, + sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */ + gost89_set_asn1_parameters, + gost89_get_asn1_parameters, + gost_cipher_ctl, + NULL, +}; + +/* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */ +/* Init functions which set specific parameters */ +static int gost_imit_init_cpa(EVP_MD_CTX *ctx); +/* process block of data */ +static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count); +/* Return computed value */ +static int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md); +/* Copies context */ +static int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from); +static int gost_imit_cleanup(EVP_MD_CTX *ctx); +/* Control function, knows how to set MAC key.*/ +static int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr); + +EVP_MD imit_gost_cpa = { + NID_id_Gost28147_89_MAC, + NID_undef, + 4, + 0, + gost_imit_init_cpa, + gost_imit_update, + gost_imit_final, + gost_imit_copy, + gost_imit_cleanup, + NULL, + NULL, + {0, 0, 0, 0, 0}, + 8, + sizeof(struct ossl_gost_imit_ctx), + gost_imit_ctrl +}; + +/* + * Correspondence between gost parameter OIDs and substitution blocks + * NID field is filed by register_gost_NID function in engine.c + * upon engine initialization + */ + +struct gost_cipher_info gost_cipher_list[] = { + /*- NID *//* + * Subst block + *//* + * Key meshing + */ + /* + * {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0}, + */ + {NID_id_Gost28147_89_cc, &GostR3411_94_CryptoProParamSet, 0}, + {NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA, + 1}, + {NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB, + 1}, + {NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC, + 1}, + {NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD, + 1}, + {NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1}, + {NID_undef, NULL, 0} +}; + +/* + * get encryption parameters from crypto network settings FIXME For now we + * use environment var CRYPT_PARAMS as place to store these settings. + * Actually, it is better to use engine control command, read from + * configuration file to set them + */ +const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj) +{ + int nid; + struct gost_cipher_info *param; + if (!obj) { + const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS); + if (!params || !strlen(params)) + return &gost_cipher_list[1]; + + nid = OBJ_txt2nid(params); + if (nid == NID_undef) { + GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, + GOST_R_INVALID_CIPHER_PARAM_OID); + return NULL; + } + } else { + nid = OBJ_obj2nid(obj); + } + for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid; + param++) ; + if (!param->sblock) { + GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS); + return NULL; + } + return param; +} + +/* Sets cipher param from paramset NID. */ +static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid) +{ + const struct gost_cipher_info *param; + param = + get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid))); + if (!param) + return 0; + + c->paramNID = param->nid; + c->key_meshing = param->key_meshing; + c->count = 0; + gost_init(&(c->cctx), param->sblock); + return 1; +} + +/* Initializes EVP_CIPHER_CTX by paramset NID */ +static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx, + const unsigned char *key, + const unsigned char *iv, int enc, + int paramNID, int mode) +{ + struct ossl_gost_cipher_ctx *c = ctx->cipher_data; + if (ctx->app_data == NULL) { + if (!gost_cipher_set_param(c, paramNID)) + return 0; + ctx->app_data = ctx->cipher_data; + } + if (key) + gost_key(&(c->cctx), key); + if (iv) + memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); + memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); + return 1; +} + +static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) +{ + struct ossl_gost_cipher_ctx *c = ctx->cipher_data; + gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA); + c->key_meshing = 1; + c->count = 0; + if (key) + gost_key(&(c->cctx), key); + if (iv) + memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); + memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); + return 1; +} + +/* Initializes EVP_CIPHER_CTX with default values */ +int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) +{ + return gost_cipher_init_param(ctx, key, iv, enc, NID_undef, + EVP_CIPH_CFB_MODE); +} + +/* + * Wrapper around gostcrypt function from gost89.c which perform key meshing + * when nesseccary + */ +static void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf) +{ + struct ossl_gost_cipher_ctx *c = ctx; + assert(c->count % 8 == 0 && c->count <= 1024); + if (c->key_meshing && c->count == 1024) { + cryptopro_key_meshing(&(c->cctx), iv); + } + gostcrypt(&(c->cctx), iv, buf); + c->count = c->count % 1024 + 8; +} + +static void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf) +{ + struct ossl_gost_cipher_ctx *c = ctx; + word32 g, go; + unsigned char buf1[8]; + assert(c->count % 8 == 0 && c->count <= 1024); + if (c->key_meshing && c->count == 1024) { + cryptopro_key_meshing(&(c->cctx), iv); + } + if (c->count == 0) { + gostcrypt(&(c->cctx), iv, buf1); + } else { + memcpy(buf1, iv, 8); + } + g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | ((word32) buf1[3] << 24); + g += 0x01010101; + buf1[0] = (unsigned char)(g & 0xff); + buf1[1] = (unsigned char)((g >> 8) & 0xff); + buf1[2] = (unsigned char)((g >> 16) & 0xff); + buf1[3] = (unsigned char)((g >> 24) & 0xff); + g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | ((word32) buf1[7] << 24); + go = g; + g += 0x01010104; + if (go > g) /* overflow */ + g++; + buf1[4] = (unsigned char)(g & 0xff); + buf1[5] = (unsigned char)((g >> 8) & 0xff); + buf1[6] = (unsigned char)((g >> 16) & 0xff); + buf1[7] = (unsigned char)((g >> 24) & 0xff); + memcpy(iv, buf1, 8); + gostcrypt(&(c->cctx), buf1, buf); + c->count = c->count % 1024 + 8; +} + +/* GOST encryption in CFB mode */ +int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, size_t inl) +{ + const unsigned char *in_ptr = in; + unsigned char *out_ptr = out; + size_t i = 0; + size_t j = 0; +/* process partial block if any */ + if (ctx->num) { + for (j = ctx->num, i = 0; j < 8 && i < inl; + j++, i++, in_ptr++, out_ptr++) { + if (!ctx->encrypt) + ctx->buf[j + 8] = *in_ptr; + *out_ptr = ctx->buf[j] ^ (*in_ptr); + if (ctx->encrypt) + ctx->buf[j + 8] = *out_ptr; + } + if (j == 8) { + memcpy(ctx->iv, ctx->buf + 8, 8); + ctx->num = 0; + } else { + ctx->num = j; + return 1; + } + } + + for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) { + /* + * block cipher current iv + */ + gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf); + /* + * xor next block of input text with it and output it + */ + /* + * output this block + */ + if (!ctx->encrypt) + memcpy(ctx->iv, in_ptr, 8); + for (j = 0; j < 8; j++) { + out_ptr[j] = ctx->buf[j] ^ in_ptr[j]; + } + /* Encrypt */ + /* Next iv is next block of cipher text */ + if (ctx->encrypt) + memcpy(ctx->iv, out_ptr, 8); + } +/* Process rest of buffer */ + if (i < inl) { + gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf); + if (!ctx->encrypt) + memcpy(ctx->buf + 8, in_ptr, inl - i); + for (j = 0; i < inl; j++, i++) { + out_ptr[j] = ctx->buf[j] ^ in_ptr[j]; + } + ctx->num = j; + if (ctx->encrypt) + memcpy(ctx->buf + 8, out_ptr, j); + } else { + ctx->num = 0; + } + return 1; +} + +static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, size_t inl) +{ + const unsigned char *in_ptr = in; + unsigned char *out_ptr = out; + size_t i = 0; + size_t j; +/* process partial block if any */ + if (ctx->num) { + for (j = ctx->num, i = 0; j < 8 && i < inl; + j++, i++, in_ptr++, out_ptr++) { + *out_ptr = ctx->buf[j] ^ (*in_ptr); + } + if (j == 8) { + ctx->num = 0; + } else { + ctx->num = j; + return 1; + } + } + + for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) { + /* + * block cipher current iv + */ + /* Encrypt */ + gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf); + /* + * xor next block of input text with it and output it + */ + /* + * output this block + */ + for (j = 0; j < 8; j++) { + out_ptr[j] = ctx->buf[j] ^ in_ptr[j]; + } + } +/* Process rest of buffer */ + if (i < inl) { + gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf); + for (j = 0; i < inl; j++, i++) { + out_ptr[j] = ctx->buf[j] ^ in_ptr[j]; + } + ctx->num = j; + } else { + ctx->num = 0; + } + return 1; +} + +/* Cleaning up of EVP_CIPHER_CTX */ +int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx) +{ + gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx); + ctx->app_data = NULL; + return 1; +} + +/* Control function for gost cipher */ +int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) +{ + switch (type) { + case EVP_CTRL_RAND_KEY: + { + if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) { + GOSTerr(GOST_F_GOST_CIPHER_CTL, + GOST_R_RANDOM_GENERATOR_ERROR); + return -1; + } + break; + } + case EVP_CTRL_PBE_PRF_NID: + if (ptr) { + *((int *)ptr) = NID_id_HMACGostR3411_94; + return 1; + } else { + return 0; + } + + default: + GOSTerr(GOST_F_GOST_CIPHER_CTL, + GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND); + return -1; + } + return 1; +} + +/* Set cipher parameters from ASN1 structure */ +int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params) +{ + int len = 0; + unsigned char *buf = NULL; + unsigned char *p = NULL; + struct ossl_gost_cipher_ctx *c = ctx->cipher_data; + GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new(); + ASN1_OCTET_STRING *os = NULL; + if (!gcp) { + GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); + return 0; + } + if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) { + GOST_CIPHER_PARAMS_free(gcp); + GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); + return 0; + } + ASN1_OBJECT_free(gcp->enc_param_set); + gcp->enc_param_set = OBJ_nid2obj(c->paramNID); + + len = i2d_GOST_CIPHER_PARAMS(gcp, NULL); + p = buf = (unsigned char *)OPENSSL_malloc(len); + if (!buf) { + GOST_CIPHER_PARAMS_free(gcp); + GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); + return 0; + } + i2d_GOST_CIPHER_PARAMS(gcp, &p); + GOST_CIPHER_PARAMS_free(gcp); + + os = ASN1_OCTET_STRING_new(); + + if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) { + OPENSSL_free(buf); + GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); + return 0; + } + OPENSSL_free(buf); + + ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os); + return 1; +} + +/* Store parameters into ASN1 structure */ +int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params) +{ + int ret = -1; + int len; + GOST_CIPHER_PARAMS *gcp = NULL; + unsigned char *p; + struct ossl_gost_cipher_ctx *c = ctx->cipher_data; + if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) { + return ret; + } + + p = params->value.sequence->data; + + gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p, + params->value.sequence->length); + + len = gcp->iv->length; + if (len != ctx->cipher->iv_len) { + GOST_CIPHER_PARAMS_free(gcp); + GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH); + return -1; + } + if (!gost_cipher_set_param(c, OBJ_obj2nid(gcp->enc_param_set))) { + GOST_CIPHER_PARAMS_free(gcp); + return -1; + } + memcpy(ctx->oiv, gcp->iv->data, len); + + GOST_CIPHER_PARAMS_free(gcp); + + return 1; +} + +int gost_imit_init_cpa(EVP_MD_CTX *ctx) +{ + struct ossl_gost_imit_ctx *c = ctx->md_data; + memset(c->buffer, 0, sizeof(c->buffer)); + memset(c->partial_block, 0, sizeof(c->partial_block)); + c->count = 0; + c->bytes_left = 0; + c->key_meshing = 1; + gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA); + return 1; +} + +static void mac_block_mesh(struct ossl_gost_imit_ctx *c, + const unsigned char *data) +{ + unsigned char buffer[8]; + /* + * We are using local buffer for iv because CryptoPro doesn't interpret + * internal state of MAC algorithm as iv during keymeshing (but does + * initialize internal state from iv in key transport + */ + assert(c->count % 8 == 0 && c->count <= 1024); + if (c->key_meshing && c->count == 1024) { + cryptopro_key_meshing(&(c->cctx), buffer); + } + mac_block(&(c->cctx), c->buffer, data); + c->count = c->count % 1024 + 8; +} + +int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count) +{ + struct ossl_gost_imit_ctx *c = ctx->md_data; + const unsigned char *p = data; + size_t bytes = count, i; + if (!(c->key_set)) { + GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET); + return 0; + } + if (c->bytes_left) { + for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) { + c->partial_block[i] = *p; + } + if (i == 8) { + mac_block_mesh(c, c->partial_block); + } else { + c->bytes_left = i; + return 1; + } + } + while (bytes > 8) { + mac_block_mesh(c, p); + p += 8; + bytes -= 8; + } + if (bytes > 0) { + memcpy(c->partial_block, p, bytes); + } + c->bytes_left = bytes; + return 1; +} + +int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md) +{ + struct ossl_gost_imit_ctx *c = ctx->md_data; + if (!c->key_set) { + GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET); + return 0; + } + if (c->count == 0 && c->bytes_left) { + unsigned char buffer[8]; + memset(buffer, 0, 8); + gost_imit_update(ctx, buffer, 8); + } + if (c->bytes_left) { + int i; + for (i = c->bytes_left; i < 8; i++) { + c->partial_block[i] = 0; + } + mac_block_mesh(c, c->partial_block); + } + get_mac(c->buffer, 32, md); + return 1; +} + +int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr) +{ + switch (type) { + case EVP_MD_CTRL_KEY_LEN: + *((unsigned int *)(ptr)) = 32; + return 1; + case EVP_MD_CTRL_SET_KEY: + { + if (arg != 32) { + GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH); + return 0; + } + + gost_key(&(((struct ossl_gost_imit_ctx *)(ctx->md_data))->cctx), + ptr); + ((struct ossl_gost_imit_ctx *)(ctx->md_data))->key_set = 1; + return 1; + + } + default: + return 0; + } +} + +int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from) +{ + memcpy(to->md_data, from->md_data, sizeof(struct ossl_gost_imit_ctx)); + return 1; +} + +/* Clean up imit ctx */ +int gost_imit_cleanup(EVP_MD_CTX *ctx) +{ + memset(ctx->md_data, 0, sizeof(struct ossl_gost_imit_ctx)); + return 1; +} |