/* ==================================================================== * Copyright (c) 2014 - 2017 The GmSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the GmSSL Project. * (http://gmssl.org/)" * * 4. The name "GmSSL Project" must not be used to endorse or promote * products derived from this software without prior written * permission. For written permission, please contact * guanzhi1980@gmail.com. * * 5. Products derived from this software may not be called "GmSSL" * nor may "GmSSL" appear in their names without prior written * permission of the GmSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the GmSSL Project * (http://gmssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE GmSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== */ /* * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include #include #include #include "evp_locl.h" # include "internal/evp_int.h" #include "../modes/modes_lcl.h" #ifndef OPENSSL_NO_SMS4 #include typedef struct { union { double align; sms4_key_t ks; } ks; /* SMS4 key schedule to use */ int key_set; /* Set if key initialised */ int iv_set; /* Set if an iv is set */ int tag_set; /* Set if tag is valid */ int len_set; /* Set if message length set */ int L, M; /* L and M parameters from RFC3610 */ int tls_aad_len; /* TLS AAD length */ CCM128_CONTEXT ccm; ccm128_f str; } EVP_SMS4_CCM_CTX; static int sms4_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) { EVP_SMS4_CCM_CTX *cctx = EVP_C_DATA(EVP_SMS4_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_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 */ len -= EVP_CCM_TLS_EXPLICIT_IV_LEN; /* If decrypting correct for tag too */ if (!EVP_CIPHER_CTX_encrypting(c)) 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; 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_SMS4_CCM_CTX *cctx_out = EVP_C_DATA(EVP_SMS4_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 sms4_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, const unsigned char *iv, int enc) { EVP_SMS4_CCM_CTX *cctx = EVP_C_DATA(EVP_SMS4_CCM_CTX,ctx); if (!iv && !key) return 1; if (key) do { sms4_set_encrypt_key(&cctx->ks.ks, key); CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L, &cctx->ks, (block128_f) sms4_encrypt); cctx->str = NULL; cctx->key_set = 1; } while (0); if (iv) { memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), iv, 15 - cctx->L); cctx->iv_set = 1; } return 1; } static int sms4_ccm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t len) { EVP_SMS4_CCM_CTX *cctx = EVP_C_DATA(EVP_SMS4_CCM_CTX,ctx); CCM128_CONTEXT *ccm = &cctx->ccm; /* Encrypt/decrypt must be performed in place */ if (out != in || len < (EVP_CCM_TLS_EXPLICIT_IV_LEN + (size_t)cctx->M)) return -1; /* If encrypting set explicit IV from sequence number (start of AAD) */ if (EVP_CIPHER_CTX_encrypting(ctx)) memcpy(out, EVP_CIPHER_CTX_buf_noconst(ctx), EVP_CCM_TLS_EXPLICIT_IV_LEN); /* Get rest of IV from explicit IV */ memcpy(EVP_CIPHER_CTX_iv_noconst(ctx) + EVP_CCM_TLS_FIXED_IV_LEN, in, EVP_CCM_TLS_EXPLICIT_IV_LEN); /* Correct length value */ len -= EVP_CCM_TLS_EXPLICIT_IV_LEN + cctx->M; if (CRYPTO_ccm128_setiv(ccm, EVP_CIPHER_CTX_iv_noconst(ctx), 15 - cctx->L, len)) return -1; /* Use saved AAD */ CRYPTO_ccm128_aad(ccm, EVP_CIPHER_CTX_buf_noconst(ctx), cctx->tls_aad_len); /* Fix buffer to point to payload */ in += EVP_CCM_TLS_EXPLICIT_IV_LEN; out += EVP_CCM_TLS_EXPLICIT_IV_LEN; if (EVP_CIPHER_CTX_encrypting(ctx)) { if (cctx->str ? CRYPTO_ccm128_encrypt_ccm64(ccm, in, out, len, cctx->str) : CRYPTO_ccm128_encrypt(ccm, in, out, len)) return -1; if (!CRYPTO_ccm128_tag(ccm, out + len, cctx->M)) return -1; return len + EVP_CCM_TLS_EXPLICIT_IV_LEN + cctx->M; } else { if (cctx->str ? !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, in + len, cctx->M)) return len; } } OPENSSL_cleanse(out, len); return -1; } } static int sms4_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t len) { EVP_SMS4_CCM_CTX *cctx = EVP_C_DATA(EVP_SMS4_CCM_CTX,ctx); CCM128_CONTEXT *ccm = &cctx->ccm; /* If not set up, return error */ if (!cctx->key_set) return -1; if (cctx->tls_aad_len >= 0) return sms4_ccm_tls_cipher(ctx, out, in, len); if (!cctx->iv_set) return -1; if (!EVP_CIPHER_CTX_encrypting(ctx) && !cctx->tag_set) return -1; if (!out) { if (!in) { 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; } /* EVP_*Final() doesn't return any data */ if (!in) return 0; /* 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 ? 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 ? !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; } } #define SMS4_CCM_BLOCK_SIZE 16 #define SMS4_CCM_IV_LENGTH 12 #define SMS4_CCM_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_FLAG_AEAD_CIPHER) static const EVP_CIPHER sms4_ccm = { NID_sms4_ccm, SMS4_CCM_BLOCK_SIZE, SMS4_KEY_LENGTH, SMS4_CCM_IV_LENGTH, SMS4_CCM_FLAGS, sms4_ccm_init_key, sms4_ccm_cipher, NULL, sizeof(EVP_SMS4_CCM_CTX), NULL, NULL, sms4_ccm_ctrl, NULL }; const EVP_CIPHER *EVP_sms4_ccm(void) { return &sms4_ccm; } #endif /* OPENSSL_NO_SMS4 */