X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fevp%2Fevp_enc.c;h=22a7b745c174ac3d68bd36698da6d8cf57fa82f5;hp=14c8506e80c973e5a62393232353ede9d9c57ba5;hb=bf6a9e66d6b339770dcc8733f97fd6eb10d58d6c;hpb=f2e5ca84d4d218a29e2c960d9b23a40d8236cd06

diff --git a/crypto/evp/evp_enc.c b/crypto/evp/evp_enc.c
index 14c8506e80..22a7b745c1 100644
--- a/crypto/evp/evp_enc.c
+++ b/crypto/evp/evp_enc.c
@@ -60,8 +60,11 @@
 #include "cryptlib.h"
 #include <openssl/evp.h>
 #include <openssl/err.h>
+#include <openssl/engine.h>
 #include "evp_locl.h"
 
+#include <assert.h>
+
 const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
 
 void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
@@ -70,24 +73,90 @@ void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
 	/* ctx->cipher=NULL; */
 	}
 
+
 int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
-	     unsigned char *key, unsigned char *iv, int enc)
+	     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 && (enc != -1)) enc = 1;
-	if (cipher) {
+	/* 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;
+	if (cipher)
+		{
+		/* Ensure an ENGINE 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). */
+		if(ctx->engine)
+			ENGINE_finish(ctx->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;
 		ctx->cipher=cipher;
+		ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
 		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)) {
+		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) {
+	else if(!ctx->cipher)
+		{
 		EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
 		return 0;
-	}
+		}
+skip_to_init:
+	/* we assume block size is a power of 2 in *cryptUpdate */
+	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)) {
 
@@ -117,66 +186,100 @@ int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
 	}
 	if(enc != -1) ctx->encrypt=enc;
 	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,
-	     unsigned char *in, int inl)
+	     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));
+	else	return EVP_DecryptFinal(ctx,out,outl);
 	}
 
 int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
-	     unsigned char *key, unsigned char *iv)
+	     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,
-	     unsigned char *key, unsigned char *iv)
+	     const unsigned char *key, const unsigned char *iv)
 	{
-	return EVP_CipherInit(ctx, cipher, key, iv, 0);
+	return EVP_CipherInit_ex(ctx, cipher, NULL, 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,
-	     unsigned char *in, int inl)
+	     const unsigned char *in, int inl)
 	{
 	int i,j,bl;
 
+	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;
-	*outl=0;
-	if ((inl == 0) && (i != bl)) return 1;
 	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;
-			if (j != 0) memcpy(&(ctx->buf[i]),in,j);
+			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;
+			*outl=bl;
 			}
 		}
-	i=inl%bl; /* how much is left */
+	else
+		*outl = 0;
+	i=inl&(bl-1);
 	inl-=i;
 	if (inl > 0)
 		{
@@ -192,17 +295,27 @@ int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
 
 int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 	{
-	int i,n,b,bl;
+	int ret;
+	ret = EVP_EncryptFinal_ex(ctx, out, outl);
+	EVP_CIPHER_CTX_cleanup(ctx);
+	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;
 	if (b == 1)
 		{
+		EVP_CIPHER_CTX_cleanup(ctx);
 		*outl=0;
 		return 1;
 		}
 	bl=ctx->buf_len;
 	if (ctx->flags & EVP_CIPH_NO_PADDING)
 		{
+		EVP_CIPHER_CTX_cleanup(ctx);
 		if(bl)
 			{
 			EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
@@ -211,64 +324,75 @@ int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 		*outl = 0;
 		return 1;
 		}
+
 	n=b-bl;
 	for (i=bl; i<b; i++)
 		ctx->buf[i]=n;
-	if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,b)) return 0;
-	*outl=b;
-	return 1;
+	ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
+
+	EVP_CIPHER_CTX_cleanup(ctx);
+
+	if(ret)
+		*outl=b;
+
+	return ret;
 	}
 
 int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
-	     unsigned char *in, int inl)
+	     const unsigned char *in, int inl)
 	{
-	int b,bl,n;
-	int keep_last=0;
+	int b, fix_len;
 
-	*outl=0;
-	if (inl == 0) return 1;
+	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;
-	if (b > 1)
+
+	if(ctx->final_used)
 		{
-		/* 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 1;
-				}
-			keep_last=1;
-			inl-=b; /* don't do the last block */
-			}
+		memcpy(out,ctx->final,b);
+		out+=b;
+		fix_len = 1;
 		}
-	if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) return 0;
+	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 (keep_last)
+	if (b > 1 && !ctx->buf_len)
 		{
-		memcpy(&(ctx->buf[0]),&(in[inl]),b);
-#ifdef DEBUG
-		if (ctx->buf_len != 0)
-			{
-			abort();
-			}
-#endif
-		ctx->buf_len=b;
+		*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);
+	EVP_CIPHER_CTX_cleanup(ctx);
+	return ret;
+	}
+
+int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 	{
 	int i,b;
 	int n;
@@ -277,6 +401,7 @@ int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 	b=ctx->cipher->block_size;
 	if (ctx->flags & EVP_CIPH_NO_PADDING)
 		{
+		EVP_CIPHER_CTX_cleanup(ctx);
 		if(ctx->buf_len)
 			{
 			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
@@ -287,35 +412,36 @@ int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
 		}
 	if (b > 1)
 		{
-		if (ctx->buf_len != b)
+		if (ctx->buf_len || !ctx->final_used)
 			{
+			EVP_CIPHER_CTX_cleanup(ctx);
 			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
 			return(0);
 			}
-		if(!EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0)) return 0;
-		if (n != b)
-			return(0);
-		n=ctx->buf[b-1];
+		n=ctx->final[b-1];
 		if (n > b)
 			{
+			EVP_CIPHER_CTX_cleanup(ctx);
 			EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
 			return(0);
 			}
 		for (i=0; i<n; i++)
 			{
-			if (ctx->buf[--b] != n)
+			if (ctx->final[--b] != n)
 				{
+				EVP_CIPHER_CTX_cleanup(ctx);
 				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];
+			out[i]=ctx->final[i];
 		*outl=n;
 		}
 	else
 		*outl=0;
+	EVP_CIPHER_CTX_cleanup(ctx);
 	return(1);
 	}
 
@@ -325,6 +451,11 @@ int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
 		{
 		if(!c->cipher->cleanup(c)) return 0;
 		}
+	OPENSSL_free(c->cipher_data);
+	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);
 	memset(c,0,sizeof(EVP_CIPHER_CTX));
 	return 1;
 	}