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openssl/crypto/evp/evp_enc.c

Index: openssl/crypto/evp/evp_enc.c
===================================================================
--- openssl/crypto/evp/evp_enc.c	(revision 105093)
+++ openssl/crypto/evp/evp_enc.c	(working copy)
@@ -66,16 +66,14 @@
 #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;
 
+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);
@@ -92,6 +90,145 @@
 	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)
 	{
@@ -151,7 +288,7 @@
 
 	if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
 		{
-		if(M_do_cipher(ctx,out,in,inl))
+		if(ctx->cipher->do_cipher(ctx,out,in,inl))
 			{
 			*outl=inl;
 			return 1;
@@ -178,7 +315,7 @@
 			{
 			j=bl-i;
 			memcpy(&(ctx->buf[i]),in,j);
-			if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0;
+			if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
 			inl-=j;
 			in+=j;
 			out+=bl;
@@ -191,7 +328,7 @@
 	inl-=i;
 	if (inl > 0)
 		{
-		if(!M_do_cipher(ctx,out,in,inl)) return 0;
+		if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
 		*outl+=inl;
 		}
 
@@ -235,7 +372,7 @@
 	n=b-bl;
 	for (i=bl; i<b; i++)
 		ctx->buf[i]=n;
-	ret=M_do_cipher(ctx,out,ctx->buf,b);
+	ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
 
 
 	if(ret)
@@ -357,6 +494,28 @@
 		}
 	}
 
+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) 
@@ -378,6 +537,27 @@
 	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)
@@ -387,54 +567,38 @@
 	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
 
-#ifdef OPENSSL_FIPS
+	EVP_CIPHER_CTX_cleanup(out);
+	memcpy(out,in,sizeof *out);
 
-static int do_evp_enc_engine_full(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)
-	{
-	if(impl)
+	if (in->cipher_data && in->cipher->ctx_size)
 		{
-		if (!ENGINE_init(impl))
+		out->cipher_data=OPENSSL_malloc(in->cipher->ctx_size);
+		if (!out->cipher_data)
 			{
-			EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
+			EVPerr(EVP_F_EVP_CIPHER_CTX_COPY,ERR_R_MALLOC_FAILURE);
 			return 0;
 			}
+		memcpy(out->cipher_data,in->cipher_data,in->cipher->ctx_size);
 		}
-	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;
+
+	if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
+		return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
 	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