--- /dev/null
+/* 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>
+#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; */
+ }
+
+
+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);
+ }
+
+#ifdef OPENSSL_FIPS
+
+/* The purpose of these is to trap programs that attempt to use non FIPS
+ * algorithms in FIPS mode and ignore the errors.
+ */
+
+int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+ const unsigned char *iv, int enc)
+ { FIPS_ERROR_IGNORED("Cipher init"); return 0;}
+
+int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+ const unsigned char *in, unsigned int inl)
+ { FIPS_ERROR_IGNORED("Cipher update"); return 0;}
+
+/* NB: no cleanup because it is allowed after failed init */
+
+int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
+ { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;}
+int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
+ { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;}
+int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
+ { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;}
+
+static const EVP_CIPHER bad_cipher =
+ {
+ 0,
+ 0,
+ 0,
+ 0,
+ 0,
+ bad_init,
+ bad_do_cipher,
+ NULL,
+ 0,
+ bad_set_asn1,
+ bad_get_asn1,
+ bad_ctrl,
+ NULL
+ };
+
+#endif
+
+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, 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, 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, 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, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ }
+ }
+ else if(!ctx->cipher)
+ {
+ EVPerr(EVP_F_EVP_CIPHERINIT, 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;
+
+ case EVP_CIPH_CBC_MODE:
+
+ OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= 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;
+ }
+ }
+
+#ifdef OPENSSL_FIPS
+ /* After 'key' is set no further parameters changes are permissible.
+ * So only check for non FIPS enabling at this point.
+ */
+ if (key && FIPS_mode())
+ {
+ if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS)
+ & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
+ {
+ EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_DISABLED_FOR_FIPS);
+ ERR_add_error_data(2, "cipher=",
+ EVP_CIPHER_name(ctx->cipher));
+ ctx->cipher = &bad_cipher;
+ return 0;
+ }
+ }
+#endif
+
+ 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;
+
+ OPENSSL_assert(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 <= 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 i,n,b,bl,ret;
+
+ 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,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 b, fix_len;
+
+ if (inl == 0)
+ {
+ *outl=0;
+ return 1;
+ }
+
+ 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,b;
+ int n;
+
+ *outl=0;
+ b=ctx->cipher->block_size;
+ if (ctx->flags & EVP_CIPH_NO_PADDING)
+ {
+ if(ctx->buf_len)
+ {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL,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,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
+ return(0);
+ }
+ OPENSSL_assert(b <= sizeof ctx->final);
+ n=ctx->final[b-1];
+ if (n > b)
+ {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
+ return(0);
+ }
+ for (i=0; i<n; i++)
+ {
+ if (ctx->final[--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->final[i];
+ *outl=n;
+ }
+ else
+ *outl=0;
+ return(1);
+ }
+
+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;
+}
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