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Diffstat (limited to 'crypto/evp/evp_enc.c')
| -rw-r--r-- | crypto/evp/evp_enc.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/crypto/evp/evp_enc.c b/crypto/evp/evp_enc.c new file mode 100644 index 0000000000..2015b5f892 --- /dev/null +++ b/crypto/evp/evp_enc.c @@ -0,0 +1,296 @@ +/* crypto/evp/evp_enc.c */ +/* Copyright (C) 1995-1997 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 "evp.h" + +char *EVP_version="EVP part of SSLeay 0.8.1b 29-Jun-1998"; + +void EVP_CipherInit(ctx,data,key,iv,enc) +EVP_CIPHER_CTX *ctx; +EVP_CIPHER *data; +unsigned char *key; +unsigned char *iv; +int enc; + { + if (enc) + EVP_EncryptInit(ctx,data,key,iv); + else + EVP_DecryptInit(ctx,data,key,iv); + } + +void EVP_CipherUpdate(ctx,out,outl,in,inl) +EVP_CIPHER_CTX *ctx; +unsigned char *out; +int *outl; +unsigned char *in; +int inl; + { + if (ctx->encrypt) + EVP_EncryptUpdate(ctx,out,outl,in,inl); + else EVP_DecryptUpdate(ctx,out,outl,in,inl); + } + +int EVP_CipherFinal(ctx,out,outl) +EVP_CIPHER_CTX *ctx; +unsigned char *out; +int *outl; + { + if (ctx->encrypt) + { + EVP_EncryptFinal(ctx,out,outl); + return(1); + } + else return(EVP_DecryptFinal(ctx,out,outl)); + } + +void EVP_EncryptInit(ctx,cipher,key,iv) +EVP_CIPHER_CTX *ctx; +EVP_CIPHER *cipher; +unsigned char *key; +unsigned char *iv; + { + if (cipher != NULL) + ctx->cipher=cipher; + ctx->cipher->init(ctx,key,iv,1); + ctx->encrypt=1; + ctx->buf_len=0; + } + +void EVP_DecryptInit(ctx,cipher,key,iv) +EVP_CIPHER_CTX *ctx; +EVP_CIPHER *cipher; +unsigned char *key; +unsigned char *iv; + { + if (cipher != NULL) + ctx->cipher=cipher; + ctx->cipher->init(ctx,key,iv,0); + ctx->encrypt=0; + ctx->buf_len=0; + } + + +void EVP_EncryptUpdate(ctx,out,outl,in,inl) +EVP_CIPHER_CTX *ctx; +unsigned char *out; +int *outl; +unsigned char *in; +int inl; + { + int i,j,bl; + + i=ctx->buf_len; + bl=ctx->cipher->block_size; + *outl=0; + if ((inl == 0) && (i != bl)) return; + if (i != 0) + { + if (i+inl < bl) + { + memcpy(&(ctx->buf[i]),in,inl); + ctx->buf_len+=inl; + return; + } + else + { + j=bl-i; + if (j != 0) memcpy(&(ctx->buf[i]),in,j); + ctx->cipher->do_cipher(ctx,out,ctx->buf,bl); + inl-=j; + in+=j; + out+=bl; + *outl+=bl; + } + } + i=inl%bl; /* how much is left */ + inl-=i; + if (inl > 0) + { + ctx->cipher->do_cipher(ctx,out,in,inl); + *outl+=inl; + } + + if (i != 0) + memcpy(ctx->buf,&(in[inl]),i); + ctx->buf_len=i; + } + +void EVP_EncryptFinal(ctx,out,outl) +EVP_CIPHER_CTX *ctx; +unsigned char *out; +int *outl; + { + int i,n,b,bl; + + b=ctx->cipher->block_size; + if (b == 1) + { + *outl=0; + return; + } + bl=ctx->buf_len; + n=b-bl; + for (i=bl; i<b; i++) + ctx->buf[i]=n; + ctx->cipher->do_cipher(ctx,out,ctx->buf,b); + *outl=b; + } + +void EVP_DecryptUpdate(ctx,out,outl,in,inl) +EVP_CIPHER_CTX *ctx; +unsigned char *out; +int *outl; +unsigned char *in; +int inl; + { + int b,bl,n; + int keep_last=0; + + *outl=0; + if (inl == 0) return; + + b=ctx->cipher->block_size; + if (b > 1) + { + /* Is the input a multiple of the block size? */ + bl=ctx->buf_len; + n=inl+bl; + if (n%b == 0) + { + if (inl < b) /* must be 'just one' buff */ + { + memcpy(&(ctx->buf[bl]),in,inl); + ctx->buf_len=b; + *outl=0; + return; + } + keep_last=1; + inl-=b; /* don't do the last block */ + } + } + EVP_EncryptUpdate(ctx,out,outl,in,inl); + + /* if we have 'decrypted' a multiple of block size, make sure + * we have a copy of this last block */ + if (keep_last) + { + memcpy(&(ctx->buf[0]),&(in[inl]),b); +#ifdef DEBUG + if (ctx->buf_len != 0) + { + abort(); + } +#endif + ctx->buf_len=b; + } + } + +int EVP_DecryptFinal(ctx,out,outl) +EVP_CIPHER_CTX *ctx; +unsigned char *out; +int *outl; + { + int i,b; + int n; + + *outl=0; + b=ctx->cipher->block_size; + if (b > 1) + { + if (ctx->buf_len != b) + { + EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH); + return(0); + } + EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0); + if (n != b) + return(0); + n=ctx->buf[b-1]; + if (n > b) + { + EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); + return(0); + } + for (i=0; i<n; i++) + { + if (ctx->buf[--b] != n) + { + EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); + return(0); + } + } + n=ctx->cipher->block_size-n; + for (i=0; i<n; i++) + out[i]=ctx->buf[i]; + *outl=n; + } + else + *outl=0; + return(1); + } + +void EVP_CIPHER_CTX_cleanup(c) +EVP_CIPHER_CTX *c; + { + if ((c->cipher != NULL) && (c->cipher->cleanup != NULL)) + c->cipher->cleanup(c); + memset(c,0,sizeof(EVP_CIPHER_CTX)); + } + |