| /* crypto/evp/evp_enc.c */ |
| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * 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 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 acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS 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 AUTHOR OR 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. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] |
| */ |
| |
| #include <stdio.h> |
| #include "cryptlib.h" |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #include <openssl/rand.h> |
| #ifndef OPENSSL_NO_ENGINE |
| #include <openssl/engine.h> |
| #endif |
| #include "evp_locl.h" |
| |
| #ifdef OPENSSL_FIPS |
| #define M_do_cipher(ctx, out, in, inl) \ |
| EVP_Cipher(ctx,out,in,inl) |
| #else |
| #define M_do_cipher(ctx, out, in, inl) \ |
| ctx->cipher->do_cipher(ctx,out,in,inl) |
| #endif |
| |
| const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT; |
| |
| EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) |
| { |
| EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx); |
| if (ctx) |
| EVP_CIPHER_CTX_init(ctx); |
| return ctx; |
| } |
| |
| int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| const unsigned char *key, const unsigned char *iv, int enc) |
| { |
| if (cipher) |
| EVP_CIPHER_CTX_init(ctx); |
| return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc); |
| } |
| |
| int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
| const unsigned char *in, int inl) |
| { |
| if (ctx->encrypt) |
| return EVP_EncryptUpdate(ctx,out,outl,in,inl); |
| else return EVP_DecryptUpdate(ctx,out,outl,in,inl); |
| } |
| |
| int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
| { |
| if (ctx->encrypt) |
| return EVP_EncryptFinal_ex(ctx,out,outl); |
| else return EVP_DecryptFinal_ex(ctx,out,outl); |
| } |
| |
| int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
| { |
| if (ctx->encrypt) |
| return EVP_EncryptFinal(ctx,out,outl); |
| else return EVP_DecryptFinal(ctx,out,outl); |
| } |
| |
| int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| const unsigned char *key, const unsigned char *iv) |
| { |
| return EVP_CipherInit(ctx, cipher, key, iv, 1); |
| } |
| |
| int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,const EVP_CIPHER *cipher, ENGINE *impl, |
| const unsigned char *key, const unsigned char *iv) |
| { |
| return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); |
| } |
| |
| int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| const unsigned char *key, const unsigned char *iv) |
| { |
| return EVP_CipherInit(ctx, cipher, key, iv, 0); |
| } |
| |
| int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, |
| const unsigned char *key, const unsigned char *iv) |
| { |
| return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); |
| } |
| |
| int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
| const unsigned char *in, int inl) |
| { |
| int i,j,bl; |
| |
| if (inl <= 0) |
| { |
| *outl = 0; |
| return inl == 0; |
| } |
| |
| if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0) |
| { |
| if(M_do_cipher(ctx,out,in,inl)) |
| { |
| *outl=inl; |
| return 1; |
| } |
| else |
| { |
| *outl=0; |
| return 0; |
| } |
| } |
| i=ctx->buf_len; |
| bl=ctx->cipher->block_size; |
| OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); |
| if (i != 0) |
| { |
| if (i+inl < bl) |
| { |
| memcpy(&(ctx->buf[i]),in,inl); |
| ctx->buf_len+=inl; |
| *outl=0; |
| return 1; |
| } |
| else |
| { |
| j=bl-i; |
| memcpy(&(ctx->buf[i]),in,j); |
| if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0; |
| inl-=j; |
| in+=j; |
| out+=bl; |
| *outl=bl; |
| } |
| } |
| else |
| *outl = 0; |
| i=inl&(bl-1); |
| inl-=i; |
| if (inl > 0) |
| { |
| if(!M_do_cipher(ctx,out,in,inl)) return 0; |
| *outl+=inl; |
| } |
| |
| if (i != 0) |
| memcpy(ctx->buf,&(in[inl]),i); |
| ctx->buf_len=i; |
| return 1; |
| } |
| |
| int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
| { |
| int ret; |
| ret = EVP_EncryptFinal_ex(ctx, out, outl); |
| return ret; |
| } |
| |
| int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
| { |
| int n,ret; |
| unsigned int i, b, bl; |
| |
| b=ctx->cipher->block_size; |
| OPENSSL_assert(b <= sizeof ctx->buf); |
| if (b == 1) |
| { |
| *outl=0; |
| return 1; |
| } |
| bl=ctx->buf_len; |
| if (ctx->flags & EVP_CIPH_NO_PADDING) |
| { |
| if(bl) |
| { |
| EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); |
| return 0; |
| } |
| *outl = 0; |
| return 1; |
| } |
| |
| n=b-bl; |
| for (i=bl; i<b; i++) |
| ctx->buf[i]=n; |
| ret=M_do_cipher(ctx,out,ctx->buf,b); |
| |
| |
| if(ret) |
| *outl=b; |
| |
| return ret; |
| } |
| |
| int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, |
| const unsigned char *in, int inl) |
| { |
| int fix_len; |
| unsigned int b; |
| |
| if (inl <= 0) |
| { |
| *outl = 0; |
| return inl == 0; |
| } |
| |
| if (ctx->flags & EVP_CIPH_NO_PADDING) |
| return EVP_EncryptUpdate(ctx, out, outl, in, inl); |
| |
| b=ctx->cipher->block_size; |
| OPENSSL_assert(b <= sizeof ctx->final); |
| |
| if(ctx->final_used) |
| { |
| memcpy(out,ctx->final,b); |
| out+=b; |
| fix_len = 1; |
| } |
| else |
| fix_len = 0; |
| |
| |
| if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) |
| return 0; |
| |
| /* if we have 'decrypted' a multiple of block size, make sure |
| * we have a copy of this last block */ |
| if (b > 1 && !ctx->buf_len) |
| { |
| *outl-=b; |
| ctx->final_used=1; |
| memcpy(ctx->final,&out[*outl],b); |
| } |
| else |
| ctx->final_used = 0; |
| |
| if (fix_len) |
| *outl += b; |
| |
| return 1; |
| } |
| |
| int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
| { |
| int ret; |
| ret = EVP_DecryptFinal_ex(ctx, out, outl); |
| return ret; |
| } |
| |
| int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) |
| { |
| int i,n; |
| unsigned int b; |
| |
| *outl=0; |
| b=ctx->cipher->block_size; |
| if (ctx->flags & EVP_CIPH_NO_PADDING) |
| { |
| if(ctx->buf_len) |
| { |
| EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); |
| return 0; |
| } |
| *outl = 0; |
| return 1; |
| } |
| if (b > 1) |
| { |
| if (ctx->buf_len || !ctx->final_used) |
| { |
| EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH); |
| return(0); |
| } |
| OPENSSL_assert(b <= sizeof ctx->final); |
| n=ctx->final[b-1]; |
| if (n == 0 || n > (int)b) |
| { |
| EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT); |
| return(0); |
| } |
| for (i=0; i<n; i++) |
| { |
| if (ctx->final[--b] != n) |
| { |
| EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_BAD_DECRYPT); |
| return(0); |
| } |
| } |
| n=ctx->cipher->block_size-n; |
| for (i=0; i<n; i++) |
| out[i]=ctx->final[i]; |
| *outl=n; |
| } |
| else |
| *outl=0; |
| return(1); |
| } |
| |
| void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) |
| { |
| if (ctx) |
| { |
| EVP_CIPHER_CTX_cleanup(ctx); |
| OPENSSL_free(ctx); |
| } |
| } |
| |
| int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) |
| { |
| if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) |
| return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); |
| if(c->key_len == keylen) return 1; |
| if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) |
| { |
| c->key_len = keylen; |
| return 1; |
| } |
| EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH); |
| return 0; |
| } |
| |
| int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) |
| { |
| if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING; |
| else ctx->flags |= EVP_CIPH_NO_PADDING; |
| return 1; |
| } |
| |
| int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) |
| { |
| if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) |
| return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); |
| if (RAND_bytes(key, ctx->key_len) <= 0) |
| return 0; |
| return 1; |
| } |
| |
| #ifndef OPENSSL_NO_ENGINE |
| |
| #ifdef OPENSSL_FIPS |
| |
| static int do_evp_enc_engine_full(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl) |
| { |
| if(impl) |
| { |
| if (!ENGINE_init(impl)) |
| { |
| EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| } |
| else |
| /* Ask if an ENGINE is reserved for this job */ |
| impl = ENGINE_get_cipher_engine((*pcipher)->nid); |
| if(impl) |
| { |
| /* There's an ENGINE for this job ... (apparently) */ |
| const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid); |
| if(!c) |
| { |
| /* One positive side-effect of US's export |
| * control history, is that we should at least |
| * be able to avoid using US mispellings of |
| * "initialisation"? */ |
| EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| /* We'll use the ENGINE's private cipher definition */ |
| *pcipher = c; |
| /* Store the ENGINE functional reference so we know |
| * 'cipher' came from an ENGINE and we need to release |
| * it when done. */ |
| ctx->engine = impl; |
| } |
| else |
| ctx->engine = NULL; |
| return 1; |
| } |
| |
| void int_EVP_CIPHER_init_engine_callbacks(void) |
| { |
| int_EVP_CIPHER_set_engine_callbacks( |
| ENGINE_finish, do_evp_enc_engine_full); |
| } |
| |
| #endif |
| |
| #endif |