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-rw-r--r--crypto/evp/evp_enc.c296
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+/* 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));
+ }
+
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