844 lines
26 KiB
C
844 lines
26 KiB
C
/*
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* Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2017 Ribose Inc. All Rights Reserved.
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* Ported from Ribose contributions from Botan.
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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 "internal/deprecated.h"
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#include "internal/cryptlib.h"
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#ifndef OPENSSL_NO_SM4
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# include <openssl/symbol_prefix.h>
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# include <openssl/evp.h>
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# include <openssl/rand.h>
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# include <openssl/modes.h>
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# include "crypto/sm4.h"
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# include "crypto/evp.h"
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# include "crypto/modes.h"
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# include "crypto/sm4_platform.h"
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# include "evp_local.h"
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typedef struct {
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union {
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OSSL_UNION_ALIGN;
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SM4_KEY ks;
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} ks;
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block128_f block;
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union {
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ecb128_f ecb;
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cbc128_f cbc;
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ctr128_f ctr;
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} stream;
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} EVP_SM4_KEY;
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# define BLOCK_CIPHER_generic(nid,blocksize,ivlen,nmode,mode,MODE,flags) \
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static const EVP_CIPHER sm4_##mode = { \
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nid##_##nmode,blocksize,128/8,ivlen, \
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flags|EVP_CIPH_##MODE##_MODE, \
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EVP_ORIG_GLOBAL, \
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sm4_init_key, \
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sm4_##mode##_cipher, \
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NULL, \
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sizeof(EVP_SM4_KEY), \
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NULL,NULL,NULL,NULL }; \
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const EVP_CIPHER *EVP_sm4_##mode(void) \
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{ return &sm4_##mode; }
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#define DEFINE_BLOCK_CIPHERS(nid,flags) \
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BLOCK_CIPHER_generic(nid,16,16,cbc,cbc,CBC,flags|EVP_CIPH_FLAG_DEFAULT_ASN1) \
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BLOCK_CIPHER_generic(nid,16,0,ecb,ecb,ECB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1) \
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BLOCK_CIPHER_generic(nid,1,16,ofb128,ofb,OFB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1) \
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BLOCK_CIPHER_generic(nid,1,16,cfb128,cfb,CFB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1) \
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BLOCK_CIPHER_generic(nid,1,16,ctr,ctr,CTR,flags)
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static int sm4_init_key(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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int mode;
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EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY,ctx);
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mode = EVP_CIPHER_CTX_get_mode(ctx);
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if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE)
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&& !enc) {
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#ifdef HWSM4_CAPABLE
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if (HWSM4_CAPABLE) {
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HWSM4_set_decrypt_key(key, &dat->ks.ks);
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dat->block = (block128_f) HWSM4_decrypt;
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dat->stream.cbc = NULL;
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# ifdef HWSM4_cbc_encrypt
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if (mode == EVP_CIPH_CBC_MODE)
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dat->stream.cbc = (cbc128_f) HWSM4_cbc_encrypt;
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# endif
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# ifdef HWSM4_ecb_encrypt
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if (mode == EVP_CIPH_ECB_MODE)
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dat->stream.ecb = (ecb128_f) HWSM4_ecb_encrypt;
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# endif
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} else
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#endif
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{
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dat->block = (block128_f) ossl_sm4_decrypt;
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ossl_sm4_set_key(key, EVP_CIPHER_CTX_get_cipher_data(ctx));
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}
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} else
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#ifdef HWSM4_CAPABLE
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if (HWSM4_CAPABLE) {
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HWSM4_set_encrypt_key(key, &dat->ks.ks);
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dat->block = (block128_f) HWSM4_encrypt;
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dat->stream.cbc = NULL;
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# ifdef HWSM4_cbc_encrypt
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if (mode == EVP_CIPH_CBC_MODE)
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dat->stream.cbc = (cbc128_f) HWSM4_cbc_encrypt;
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else
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# endif
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# ifdef HWSM4_ecb_encrypt
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if (mode == EVP_CIPH_ECB_MODE)
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dat->stream.ecb = (ecb128_f) HWSM4_ecb_encrypt;
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else
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# endif
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# ifdef HWSM4_ctr32_encrypt_blocks
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if (mode == EVP_CIPH_CTR_MODE)
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dat->stream.ctr = (ctr128_f) HWSM4_ctr32_encrypt_blocks;
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else
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# endif
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(void)0; /* terminate potentially open 'else' */
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} else
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#endif
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{
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dat->block = (block128_f) ossl_sm4_encrypt;
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ossl_sm4_set_key(key, EVP_CIPHER_CTX_get_cipher_data(ctx));
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}
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return 1;
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}
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static int sm4_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len)
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{
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EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY,ctx);
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if (dat->stream.cbc)
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(*dat->stream.cbc) (in, out, len, &dat->ks.ks, ctx->iv,
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EVP_CIPHER_CTX_is_encrypting(ctx));
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else if (EVP_CIPHER_CTX_is_encrypting(ctx))
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CRYPTO_cbc128_encrypt(in, out, len, &dat->ks, ctx->iv,
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dat->block);
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else
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CRYPTO_cbc128_decrypt(in, out, len, &dat->ks,
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ctx->iv, dat->block);
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return 1;
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}
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static int sm4_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len)
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{
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EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY,ctx);
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int num = EVP_CIPHER_CTX_get_num(ctx);
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CRYPTO_cfb128_encrypt(in, out, len, &dat->ks,
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ctx->iv, &num,
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EVP_CIPHER_CTX_is_encrypting(ctx), dat->block);
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EVP_CIPHER_CTX_set_num(ctx, num);
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return 1;
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}
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static int sm4_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len)
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{
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size_t bl = EVP_CIPHER_CTX_get_block_size(ctx);
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size_t i;
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EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY,ctx);
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if (len < bl)
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return 1;
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if (dat->stream.ecb != NULL)
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(*dat->stream.ecb) (in, out, len, &dat->ks.ks,
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EVP_CIPHER_CTX_is_encrypting(ctx));
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else
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for (i = 0, len -= bl; i <= len; i += bl)
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(*dat->block) (in + i, out + i, &dat->ks);
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return 1;
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}
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static int sm4_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len)
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{
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EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY,ctx);
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int num = EVP_CIPHER_CTX_get_num(ctx);
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CRYPTO_ofb128_encrypt(in, out, len, &dat->ks,
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ctx->iv, &num, dat->block);
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EVP_CIPHER_CTX_set_num(ctx, num);
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return 1;
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}
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static int sm4_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len)
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{
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int n = EVP_CIPHER_CTX_get_num(ctx);
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unsigned int num;
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EVP_SM4_KEY *dat = EVP_C_DATA(EVP_SM4_KEY,ctx);
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if (n < 0)
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return 0;
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num = (unsigned int)n;
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if (dat->stream.ctr)
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CRYPTO_ctr128_encrypt_ctr32(in, out, len, &dat->ks,
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ctx->iv,
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EVP_CIPHER_CTX_buf_noconst(ctx),
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&num, dat->stream.ctr);
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else
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CRYPTO_ctr128_encrypt(in, out, len, &dat->ks,
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ctx->iv,
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EVP_CIPHER_CTX_buf_noconst(ctx), &num,
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dat->block);
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EVP_CIPHER_CTX_set_num(ctx, num);
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return 1;
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}
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DEFINE_BLOCK_CIPHERS(NID_sm4, 0)
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# define BLOCK_CIPHER_custom(nid,blocksize,ivlen,mode,MODE,flags) \
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static const EVP_CIPHER sm4_##mode = { \
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nid##_##mode,blocksize, 128/8, ivlen, \
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flags|EVP_CIPH_##MODE##_MODE, \
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EVP_ORIG_GLOBAL, \
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sm4_##mode##_init, \
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sm4_##mode##_cipher, \
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sm4_##mode##_cleanup, \
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sizeof(EVP_SM4_##MODE##_CTX), \
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NULL,NULL,sm4_##mode##_ctrl,NULL }; \
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const EVP_CIPHER *EVP_sm4_##mode(void) \
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{ return &sm4_##mode; }
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typedef struct {
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SM4_KEY ks; /* SM4 key schedule to use */
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int key_set; /* Set if key initialized */
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int iv_set; /* Set if an iv is set */
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GCM128_CONTEXT gcm;
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unsigned char *iv; /* Temporary IV store */
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int ivlen; /* IV length */
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int taglen;
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int iv_gen; /* It is OK to generate IVs */
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int tls_aad_len; /* TLS AAD length */
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ctr128_f ctr;
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} EVP_SM4_GCM_CTX;
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typedef struct {
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SM4_KEY ks; /* SM4 key schedule to use */
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int key_set; /* Set if key initialized */
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int iv_set; /* Set if an iv is set */
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int tag_set; /* Set if tag is valid */
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int len_set; /* Set if message length set */
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int L, M; /* L and M parameters from RFC3610 */
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int tls_aad_len; /* TLS AAD length */
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CCM128_CONTEXT ccm;
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ccm128_f str;
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} EVP_SM4_CCM_CTX;
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static int sm4_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
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static int sm4_gcm_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc);
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static int sm4_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len);
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static int sm4_gcm_cleanup(EVP_CIPHER_CTX *c);
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static int sm4_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
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static int sm4_ccm_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc);
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static int sm4_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t len);
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static int sm4_ccm_cleanup(EVP_CIPHER_CTX *c);
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/* increment counter (64-bit int) by 1 */
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static void ctr64_inc(unsigned char *counter)
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{
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int n = 8;
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unsigned char c;
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do {
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--n;
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c = counter[n];
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++c;
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counter[n] = c;
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if (c)
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return;
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} while (n);
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}
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static int sm4_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
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{
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EVP_SM4_GCM_CTX *gctx = EVP_C_DATA(EVP_SM4_GCM_CTX,c);
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switch (type) {
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case EVP_CTRL_INIT:
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gctx->key_set = 0;
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gctx->iv_set = 0;
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gctx->ivlen = EVP_CIPHER_iv_length(c->cipher);
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gctx->iv = c->iv;
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gctx->taglen = -1;
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gctx->iv_gen = 0;
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gctx->tls_aad_len = -1;
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return 1;
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case EVP_CTRL_GET_IVLEN:
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*(int *)ptr = gctx->ivlen;
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return 1;
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case EVP_CTRL_AEAD_SET_IVLEN:
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if (arg <= 0)
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return 0;
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/* Allocate memory for IV if needed */
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if ((arg > EVP_MAX_IV_LENGTH) && (arg > gctx->ivlen)) {
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if (gctx->iv != c->iv)
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OPENSSL_free(gctx->iv);
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if ((gctx->iv = OPENSSL_malloc(arg)) == NULL)
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return 0;
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}
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gctx->ivlen = arg;
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return 1;
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case EVP_CTRL_AEAD_SET_TAG:
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if (arg <= 0 || arg > 16 || c->encrypt)
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return 0;
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memcpy(c->buf, ptr, arg);
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gctx->taglen = arg;
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return 1;
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case EVP_CTRL_AEAD_GET_TAG:
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if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0)
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return 0;
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memcpy(ptr, c->buf, arg);
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return 1;
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case EVP_CTRL_GCM_SET_IV_FIXED:
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/* Special case: -1 length restores whole IV */
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if (arg == -1) {
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memcpy(gctx->iv, ptr, gctx->ivlen);
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gctx->iv_gen = 1;
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return 1;
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}
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/*
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* Fixed field must be at least 4 bytes and invocation field at least
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* 8.
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*/
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if ((arg < 4) || (gctx->ivlen - arg) < 8)
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return 0;
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if (arg)
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memcpy(gctx->iv, ptr, arg);
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if (c->encrypt && RAND_bytes(gctx->iv + arg, gctx->ivlen - arg) <= 0)
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return 0;
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gctx->iv_gen = 1;
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return 1;
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case EVP_CTRL_GCM_IV_GEN:
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if (gctx->iv_gen == 0 || gctx->key_set == 0)
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return 0;
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CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
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if (arg <= 0 || arg > gctx->ivlen)
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arg = gctx->ivlen;
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memcpy(ptr, gctx->iv + gctx->ivlen - arg, arg);
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/*
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* Invocation field will be at least 8 bytes in size and so no need
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* to check wrap around or increment more than last 8 bytes.
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*/
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ctr64_inc(gctx->iv + gctx->ivlen - 8);
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gctx->iv_set = 1;
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return 1;
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case EVP_CTRL_GCM_SET_IV_INV:
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if (gctx->iv_gen == 0 || gctx->key_set == 0 || c->encrypt)
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return 0;
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memcpy(gctx->iv + gctx->ivlen - arg, ptr, arg);
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CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
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gctx->iv_set = 1;
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return 1;
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case EVP_CTRL_AEAD_TLS1_AAD:
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/* Save the AAD for later use */
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if (arg != EVP_AEAD_TLS1_AAD_LEN)
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return 0;
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memcpy(c->buf, ptr, arg);
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gctx->tls_aad_len = arg;
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{
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unsigned int len = c->buf[arg - 2] << 8 | c->buf[arg - 1];
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/* Correct length for explicit IV */
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if (len < EVP_GCM_TLS_EXPLICIT_IV_LEN)
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return 0;
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len -= EVP_GCM_TLS_EXPLICIT_IV_LEN;
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/* If decrypting correct for tag too */
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if (!c->encrypt) {
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if (len < EVP_GCM_TLS_TAG_LEN)
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return 0;
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len -= EVP_GCM_TLS_TAG_LEN;
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}
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c->buf[arg - 2] = len >> 8;
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c->buf[arg - 1] = len & 0xff;
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}
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/* Extra padding: tag appended to record */
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return EVP_GCM_TLS_TAG_LEN;
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case EVP_CTRL_COPY:
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{
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EVP_CIPHER_CTX *out = ptr;
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EVP_SM4_GCM_CTX *gctx_out = EVP_C_DATA(EVP_SM4_GCM_CTX,out);
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if (gctx->gcm.key) {
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if (gctx->gcm.key != &gctx->ks)
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return 0;
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gctx_out->gcm.key = &gctx_out->ks;
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}
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if (gctx->iv == c->iv)
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gctx_out->iv = out->iv;
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else {
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if ((gctx_out->iv = OPENSSL_malloc(gctx->ivlen)) == NULL) {
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return 0;
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}
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memcpy(gctx_out->iv, gctx->iv, gctx->ivlen);
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}
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return 1;
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}
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case EVP_CTRL_AEAD_SET_MAC_KEY:
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/* no-op */
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return 1;
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default:
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return -1;
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}
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return 1;
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}
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|
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static int sm4_gcm_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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EVP_SM4_GCM_CTX *gctx = EVP_C_DATA(EVP_SM4_GCM_CTX,ctx);
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if (iv == NULL && key == NULL)
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return 1;
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if (key) {
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do {
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# ifdef HWSM4_CAPABLE
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if (HWSM4_CAPABLE) {
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HWSM4_set_encrypt_key(key, &gctx->ks);
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CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks,
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(block128_f)HWSM4_encrypt);
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# ifdef HWSM4_ctr32_encrypt_blocks
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gctx->ctr = (ctr128_f)HWSM4_ctr32_encrypt_blocks;
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# else /* HWSM4_ctr32_encrypt_blocks */
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gctx->ctr = (ctr128_f)NULL;
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# endif
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break;
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} else
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# endif /* HWSM4_CAPABLE */
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(void)0; /* terminate potentially open 'else' */
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ossl_sm4_set_key(key, &gctx->ks);
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CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks,
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(block128_f)ossl_sm4_encrypt);
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gctx->ctr = NULL;
|
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} while (0);
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|
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/*
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* If we have an iv can set it directly, otherwise use saved IV.
|
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*/
|
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if (iv == NULL && gctx->iv_set)
|
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iv = gctx->iv;
|
|
if (iv) {
|
|
CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
|
|
gctx->iv_set = 1;
|
|
}
|
|
gctx->key_set = 1;
|
|
} else {
|
|
/* If key set use IV, otherwise copy */
|
|
if (gctx->key_set)
|
|
CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
|
|
else
|
|
memcpy(gctx->iv, iv, gctx->ivlen);
|
|
gctx->iv_set = 1;
|
|
gctx->iv_gen = 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Handle TLS GCM packet format. This consists of the last portion of the IV
|
|
* followed by the payload and finally the tag. On encrypt generate IV,
|
|
* encrypt payload and write the tag. On verify retrieve IV, decrypt payload
|
|
* and verify tag.
|
|
*/
|
|
|
|
static int sm4_gcm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
|
|
const unsigned char *in, size_t len)
|
|
{
|
|
EVP_SM4_GCM_CTX *gctx = EVP_C_DATA(EVP_SM4_GCM_CTX,ctx);
|
|
int rv = -1;
|
|
/* Encrypt/decrypt must be performed in place */
|
|
if (out != in
|
|
|| len < (EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN))
|
|
return -1;
|
|
/*
|
|
* Set IV from start of buffer or generate IV and write to start of
|
|
* buffer.
|
|
*/
|
|
if (EVP_CIPHER_CTX_ctrl(ctx, ctx->encrypt ? EVP_CTRL_GCM_IV_GEN
|
|
: EVP_CTRL_GCM_SET_IV_INV,
|
|
EVP_GCM_TLS_EXPLICIT_IV_LEN, out) <= 0)
|
|
goto err;
|
|
/* Use saved AAD */
|
|
if (CRYPTO_gcm128_aad(&gctx->gcm, ctx->buf, gctx->tls_aad_len))
|
|
goto err;
|
|
/* Fix buffer and length to point to payload */
|
|
in += EVP_GCM_TLS_EXPLICIT_IV_LEN;
|
|
out += EVP_GCM_TLS_EXPLICIT_IV_LEN;
|
|
len -= EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
|
|
if (ctx->encrypt) {
|
|
/* Encrypt payload */
|
|
if (gctx->ctr) {
|
|
size_t bulk = 0;
|
|
if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm,
|
|
in + bulk,
|
|
out + bulk,
|
|
len - bulk, gctx->ctr))
|
|
goto err;
|
|
} else {
|
|
size_t bulk = 0;
|
|
if (CRYPTO_gcm128_encrypt(&gctx->gcm,
|
|
in + bulk, out + bulk, len - bulk))
|
|
goto err;
|
|
}
|
|
out += len;
|
|
/* Finally write tag */
|
|
CRYPTO_gcm128_tag(&gctx->gcm, out, EVP_GCM_TLS_TAG_LEN);
|
|
rv = len + EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
|
|
} else {
|
|
/* Decrypt */
|
|
if (gctx->ctr) {
|
|
size_t bulk = 0;
|
|
if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm,
|
|
in + bulk,
|
|
out + bulk,
|
|
len - bulk, gctx->ctr))
|
|
goto err;
|
|
} else {
|
|
size_t bulk = 0;
|
|
if (CRYPTO_gcm128_decrypt(&gctx->gcm,
|
|
in + bulk, out + bulk, len - bulk))
|
|
goto err;
|
|
}
|
|
/* Retrieve tag */
|
|
CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, EVP_GCM_TLS_TAG_LEN);
|
|
/* If tag mismatch wipe buffer */
|
|
if (CRYPTO_memcmp(ctx->buf, in + len, EVP_GCM_TLS_TAG_LEN)) {
|
|
OPENSSL_cleanse(out, len);
|
|
goto err;
|
|
}
|
|
rv = len;
|
|
}
|
|
|
|
err:
|
|
gctx->iv_set = 0;
|
|
gctx->tls_aad_len = -1;
|
|
return rv;
|
|
}
|
|
|
|
static int sm4_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
|
|
const unsigned char *in, size_t len)
|
|
{
|
|
EVP_SM4_GCM_CTX *gctx = EVP_C_DATA(EVP_SM4_GCM_CTX,ctx);
|
|
|
|
/* If not set up, return error */
|
|
if (!gctx->key_set)
|
|
return -1;
|
|
|
|
if (gctx->tls_aad_len >= 0)
|
|
return sm4_gcm_tls_cipher(ctx, out, in, len);
|
|
|
|
if (!gctx->iv_set)
|
|
return -1;
|
|
|
|
if (in != NULL) {
|
|
if (out == NULL) {
|
|
if (CRYPTO_gcm128_aad(&gctx->gcm, in, len))
|
|
return -1;
|
|
} else if (ctx->encrypt) {
|
|
if (gctx->ctr != NULL) {
|
|
if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm, in, out, len, gctx->ctr))
|
|
return -1;
|
|
} else {
|
|
if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len))
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (gctx->ctr != NULL) {
|
|
if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm, in, out, len, gctx->ctr))
|
|
return -1;
|
|
} else {
|
|
if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len))
|
|
return -1;
|
|
}
|
|
}
|
|
return len;
|
|
} else {
|
|
if (!ctx->encrypt) {
|
|
if (gctx->taglen < 0)
|
|
return -1;
|
|
if (CRYPTO_gcm128_finish(&gctx->gcm, ctx->buf, gctx->taglen) != 0)
|
|
return -1;
|
|
gctx->iv_set = 0;
|
|
return 0;
|
|
}
|
|
CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
|
|
gctx->taglen = 16;
|
|
/* Don't reuse the IV */
|
|
gctx->iv_set = 0;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int sm4_gcm_cleanup(EVP_CIPHER_CTX *c)
|
|
{
|
|
EVP_SM4_GCM_CTX *gctx = EVP_C_DATA(EVP_SM4_GCM_CTX, c);
|
|
const unsigned char *iv;
|
|
|
|
if (gctx == NULL)
|
|
return 0;
|
|
|
|
iv = EVP_CIPHER_CTX_iv(c);
|
|
if (iv != gctx->iv)
|
|
OPENSSL_free(gctx->iv);
|
|
|
|
OPENSSL_cleanse(gctx, sizeof(*gctx));
|
|
return 1;
|
|
}
|
|
|
|
static int sm4_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
|
|
{
|
|
EVP_SM4_CCM_CTX *cctx = EVP_C_DATA(EVP_SM4_CCM_CTX,c);
|
|
|
|
switch (type) {
|
|
case EVP_CTRL_INIT:
|
|
cctx->key_set = 0;
|
|
cctx->iv_set = 0;
|
|
cctx->L = 8;
|
|
cctx->M = 12;
|
|
cctx->tag_set = 0;
|
|
cctx->len_set = 0;
|
|
cctx->tls_aad_len = -1;
|
|
return 1;
|
|
case EVP_CTRL_GET_IVLEN:
|
|
*(int *)ptr = 15 - cctx->L;
|
|
return 1;
|
|
case EVP_CTRL_AEAD_TLS1_AAD:
|
|
/* Save the AAD for later use */
|
|
if (arg != EVP_AEAD_TLS1_AAD_LEN)
|
|
return 0;
|
|
memcpy(EVP_CIPHER_CTX_buf_noconst(c), ptr, arg);
|
|
cctx->tls_aad_len = arg;
|
|
{
|
|
uint16_t len =
|
|
EVP_CIPHER_CTX_buf_noconst(c)[arg - 2] << 8
|
|
| EVP_CIPHER_CTX_buf_noconst(c)[arg - 1];
|
|
|
|
/* Correct length for explicit IV */
|
|
if (len < EVP_CCM_TLS_EXPLICIT_IV_LEN)
|
|
return 0;
|
|
len -= EVP_CCM_TLS_EXPLICIT_IV_LEN;
|
|
/* If decrypting correct for tag too */
|
|
if (!EVP_CIPHER_CTX_encrypting(c)) {
|
|
if (len < cctx->M)
|
|
return 0;
|
|
len -= cctx->M;
|
|
}
|
|
EVP_CIPHER_CTX_buf_noconst(c)[arg - 2] = len >> 8;
|
|
EVP_CIPHER_CTX_buf_noconst(c)[arg - 1] = len & 0xff;
|
|
}
|
|
/* Extra padding: tag appended to record */
|
|
return cctx->M;
|
|
|
|
case EVP_CTRL_CCM_SET_IV_FIXED:
|
|
/* Sanity check length */
|
|
if (arg != EVP_CCM_TLS_FIXED_IV_LEN)
|
|
return 0;
|
|
/* Just copy to first part of IV */
|
|
memcpy(EVP_CIPHER_CTX_iv_noconst(c), ptr, arg);
|
|
return 1;
|
|
|
|
case EVP_CTRL_AEAD_SET_IVLEN:
|
|
arg = 15 - arg;
|
|
/* fall thru */
|
|
case EVP_CTRL_CCM_SET_L:
|
|
if (arg < 2 || arg > 8)
|
|
return 0;
|
|
cctx->L = arg;
|
|
return 1;
|
|
|
|
case EVP_CTRL_AEAD_SET_TAG:
|
|
if ((arg & 1) || arg < 4 || arg > 16)
|
|
return 0;
|
|
if (EVP_CIPHER_CTX_encrypting(c) && ptr)
|
|
return 0;
|
|
if (ptr) {
|
|
cctx->tag_set = 1;
|
|
memcpy(EVP_CIPHER_CTX_buf_noconst(c), ptr, arg);
|
|
}
|
|
cctx->M = arg;
|
|
return 1;
|
|
|
|
case EVP_CTRL_AEAD_GET_TAG:
|
|
if (!EVP_CIPHER_CTX_encrypting(c) || !cctx->tag_set)
|
|
return 0;
|
|
if (!CRYPTO_ccm128_tag(&cctx->ccm, ptr, (size_t)arg))
|
|
return 0;
|
|
cctx->tag_set = 0;
|
|
cctx->iv_set = 0;
|
|
cctx->len_set = 0;
|
|
return 1;
|
|
|
|
case EVP_CTRL_COPY:
|
|
{
|
|
EVP_CIPHER_CTX *out = ptr;
|
|
EVP_SM4_CCM_CTX *cctx_out = EVP_C_DATA(EVP_SM4_CCM_CTX,out);
|
|
|
|
if (cctx->ccm.key) {
|
|
if (cctx->ccm.key != &cctx->ks)
|
|
return 0;
|
|
cctx_out->ccm.key = &cctx_out->ks;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
default:
|
|
return -1;
|
|
|
|
}
|
|
}
|
|
|
|
static int sm4_ccm_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
|
|
const unsigned char *iv, int enc)
|
|
{
|
|
EVP_SM4_CCM_CTX *cctx = EVP_C_DATA(EVP_SM4_CCM_CTX,ctx);
|
|
|
|
if (iv == NULL && key == NULL)
|
|
return 1;
|
|
if (key != NULL)
|
|
do {
|
|
# ifdef HWSM4_CAPABLE
|
|
if (HWSM4_CAPABLE) {
|
|
HWSM4_set_encrypt_key(key, &cctx->ks);
|
|
CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
|
|
&cctx->ks, (block128_f)HWSM4_encrypt);
|
|
cctx->str = NULL;
|
|
cctx->key_set = 1;
|
|
break;
|
|
} else
|
|
# endif /* HWSM4_CAPABLE */
|
|
(void)0; /* terminate potentially open 'else' */
|
|
|
|
ossl_sm4_set_key(key, &cctx->ks);
|
|
CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
|
|
&cctx->ks, (block128_f)ossl_sm4_encrypt);
|
|
cctx->str = NULL;
|
|
cctx->key_set = 1;
|
|
} while (0);
|
|
if (iv != NULL) {
|
|
memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), iv, 15 - cctx->L);
|
|
cctx->iv_set = 1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int sm4_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
|
|
const unsigned char *in, size_t len)
|
|
{
|
|
EVP_SM4_CCM_CTX *cctx = EVP_C_DATA(EVP_SM4_CCM_CTX,ctx);
|
|
CCM128_CONTEXT *ccm = &cctx->ccm;
|
|
|
|
/* If not set up, return error */
|
|
if (!cctx->key_set)
|
|
return -1;
|
|
|
|
/* EVP_*Final() doesn't return any data */
|
|
if (in == NULL && out != NULL)
|
|
return 0;
|
|
|
|
if (!cctx->iv_set)
|
|
return -1;
|
|
|
|
if (out == NULL) {
|
|
if (in == NULL) {
|
|
if (CRYPTO_ccm128_setiv(ccm, EVP_CIPHER_CTX_iv_noconst(ctx),
|
|
15 - cctx->L, len))
|
|
return -1;
|
|
cctx->len_set = 1;
|
|
return len;
|
|
}
|
|
/* If have AAD need message length */
|
|
if (!cctx->len_set && len)
|
|
return -1;
|
|
CRYPTO_ccm128_aad(ccm, in, len);
|
|
return len;
|
|
}
|
|
|
|
/* The tag must be set before actually decrypting data */
|
|
if (!EVP_CIPHER_CTX_encrypting(ctx) && !cctx->tag_set)
|
|
return -1;
|
|
|
|
/* If not set length yet do it */
|
|
if (!cctx->len_set) {
|
|
if (CRYPTO_ccm128_setiv(ccm, EVP_CIPHER_CTX_iv_noconst(ctx),
|
|
15 - cctx->L, len))
|
|
return -1;
|
|
cctx->len_set = 1;
|
|
}
|
|
if (EVP_CIPHER_CTX_encrypting(ctx)) {
|
|
if (cctx->str != NULL ?
|
|
CRYPTO_ccm128_encrypt_ccm64(ccm, in, out, len,
|
|
cctx->str) :
|
|
CRYPTO_ccm128_encrypt(ccm, in, out, len))
|
|
return -1;
|
|
cctx->tag_set = 1;
|
|
return len;
|
|
} else {
|
|
int rv = -1;
|
|
|
|
if (cctx->str != NULL ? !CRYPTO_ccm128_decrypt_ccm64(ccm, in, out, len,
|
|
cctx->str) :
|
|
!CRYPTO_ccm128_decrypt(ccm, in, out, len)) {
|
|
unsigned char tag[16];
|
|
if (CRYPTO_ccm128_tag(ccm, tag, cctx->M)) {
|
|
if (!CRYPTO_memcmp(tag, EVP_CIPHER_CTX_buf_noconst(ctx),
|
|
cctx->M))
|
|
rv = len;
|
|
}
|
|
}
|
|
if (rv == -1)
|
|
OPENSSL_cleanse(out, len);
|
|
cctx->iv_set = 0;
|
|
cctx->tag_set = 0;
|
|
cctx->len_set = 0;
|
|
return rv;
|
|
}
|
|
|
|
}
|
|
|
|
static int sm4_ccm_cleanup(EVP_CIPHER_CTX *c)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
#define CUSTOM_FLAGS (EVP_CIPH_FLAG_DEFAULT_ASN1 \
|
|
| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
|
|
| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT \
|
|
| EVP_CIPH_CUSTOM_COPY | EVP_CIPH_CUSTOM_IV_LENGTH)
|
|
|
|
BLOCK_CIPHER_custom(NID_sm4, 1, 12, gcm, GCM,
|
|
EVP_CIPH_FLAG_AEAD_CIPHER | CUSTOM_FLAGS)
|
|
BLOCK_CIPHER_custom(NID_sm4, 1, 12, ccm, CCM,
|
|
EVP_CIPH_FLAG_AEAD_CIPHER | CUSTOM_FLAGS)
|
|
#endif
|