diff options
Diffstat (limited to 'openssl/crypto/evp/evp_enc.c')
-rw-r--r-- | openssl/crypto/evp/evp_enc.c | 604 |
1 files changed, 604 insertions, 0 deletions
diff --git a/openssl/crypto/evp/evp_enc.c b/openssl/crypto/evp/evp_enc.c new file mode 100644 index 0000000..c268d25 --- /dev/null +++ b/openssl/crypto/evp/evp_enc.c @@ -0,0 +1,604 @@ +/* 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" + +const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT; + +void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) + { + memset(ctx,0,sizeof(EVP_CIPHER_CTX)); + /* ctx->cipher=NULL; */ + } + +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_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, + const unsigned char *key, const unsigned char *iv, int enc) + { + if (enc == -1) + enc = ctx->encrypt; + else + { + if (enc) + enc = 1; + ctx->encrypt = enc; + } +#ifndef OPENSSL_NO_ENGINE + /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts + * so this context may already have an ENGINE! Try to avoid releasing + * the previous handle, re-querying for an ENGINE, and having a + * reinitialisation, when it may all be unecessary. */ + if (ctx->engine && ctx->cipher && (!cipher || + (cipher && (cipher->nid == ctx->cipher->nid)))) + goto skip_to_init; +#endif + if (cipher) + { + /* Ensure a context left lying around from last time is cleared + * (the previous check attempted to avoid this if the same + * ENGINE and EVP_CIPHER could be used). */ + EVP_CIPHER_CTX_cleanup(ctx); + + /* Restore encrypt field: it is zeroed by cleanup */ + ctx->encrypt = enc; +#ifndef OPENSSL_NO_ENGINE + if(impl) + { + if (!ENGINE_init(impl)) + { + EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); + return 0; + } + } + else + /* Ask if an ENGINE is reserved for this job */ + impl = ENGINE_get_cipher_engine(cipher->nid); + if(impl) + { + /* There's an ENGINE for this job ... (apparently) */ + const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->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_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); + return 0; + } + /* We'll use the ENGINE's private cipher definition */ + cipher = 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; +#endif + + ctx->cipher=cipher; + if (ctx->cipher->ctx_size) + { + ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); + if (!ctx->cipher_data) + { + EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); + return 0; + } + } + else + { + ctx->cipher_data = NULL; + } + ctx->key_len = cipher->key_len; + ctx->flags = 0; + if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) + { + if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) + { + EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); + return 0; + } + } + } + else if(!ctx->cipher) + { + EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); + return 0; + } +#ifndef OPENSSL_NO_ENGINE +skip_to_init: +#endif + /* we assume block size is a power of 2 in *cryptUpdate */ + OPENSSL_assert(ctx->cipher->block_size == 1 + || ctx->cipher->block_size == 8 + || ctx->cipher->block_size == 16); + + if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { + switch(EVP_CIPHER_CTX_mode(ctx)) { + + case EVP_CIPH_STREAM_CIPHER: + case EVP_CIPH_ECB_MODE: + break; + + case EVP_CIPH_CFB_MODE: + case EVP_CIPH_OFB_MODE: + + ctx->num = 0; + /* fall-through */ + + case EVP_CIPH_CBC_MODE: + + OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= + (int)sizeof(ctx->iv)); + if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); + memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); + break; + + default: + return 0; + break; + } + } + + if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { + if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; + } + ctx->buf_len=0; + ctx->final_used=0; + ctx->block_mask=ctx->cipher->block_size-1; + return 1; + } + +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(ctx->cipher->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(!ctx->cipher->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(!ctx->cipher->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=ctx->cipher->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_cleanup(EVP_CIPHER_CTX *c) + { + if (c->cipher != NULL) + { + if(c->cipher->cleanup && !c->cipher->cleanup(c)) + return 0; + /* Cleanse cipher context data */ + if (c->cipher_data) + OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); + } + if (c->cipher_data) + OPENSSL_free(c->cipher_data); +#ifndef OPENSSL_NO_ENGINE + if (c->engine) + /* The EVP_CIPHER we used belongs to an ENGINE, release the + * functional reference we held for this reason. */ + ENGINE_finish(c->engine); +#endif + memset(c,0,sizeof(EVP_CIPHER_CTX)); + return 1; + } + +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_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) +{ + int ret; + if(!ctx->cipher) { + EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); + return 0; + } + + if(!ctx->cipher->ctrl) { + EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); + return 0; + } + + ret = ctx->cipher->ctrl(ctx, type, arg, ptr); + if(ret == -1) { + EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); + return 0; + } + return ret; +} + +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; + } + +int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) + { + if ((in == NULL) || (in->cipher == NULL)) + { + EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED); + return 0; + } +#ifndef OPENSSL_NO_ENGINE + /* Make sure it's safe to copy a cipher context using an ENGINE */ + if (in->engine && !ENGINE_init(in->engine)) + { + EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_ENGINE_LIB); + return 0; + } +#endif + + EVP_CIPHER_CTX_cleanup(out); + memcpy(out,in,sizeof *out); + + if (in->cipher_data && in->cipher->ctx_size) + { + out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size); + if (!out->cipher_data) + { + EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE); + return 0; + } + memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size); + } + + if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) + return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out); + return 1; + } + |