X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Faes%2Faes_cbc.c;h=d2ba6bcdb4659d1ed9c6a01a898b08e167e0f2ef;hb=71fc9b37aedb0ee7e664fba53696a11d0b879dd7;hp=8974dc35a5be0e1a1406992ec89bea767d4f2643;hpb=b6fee5c2fb68918ff64cba8b7a1ff24e9d922093;p=oweals%2Fopenssl.git

diff --git a/crypto/aes/aes_cbc.c b/crypto/aes/aes_cbc.c
index 8974dc35a5..d2ba6bcdb4 100644
--- a/crypto/aes/aes_cbc.c
+++ b/crypto/aes/aes_cbc.c
@@ -63,49 +63,69 @@ void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
 		     const unsigned long length, const AES_KEY *key,
 		     unsigned char *ivec, const int enc) {
 
-	int n;
+	unsigned long n;
 	unsigned long len = length;
-	unsigned char tmp[16];
+	unsigned char tmp[AES_BLOCK_SIZE];
+	const unsigned char *iv = ivec;
 
 	assert(in && out && key && ivec);
 	assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
 
 	if (AES_ENCRYPT == enc) {
 		while (len >= AES_BLOCK_SIZE) {
-			for(n=0; n < 16; ++n)
-				tmp[n] = in[n] ^ ivec[n];
-			AES_encrypt(tmp, out, key);
-			memcpy(ivec, out, 16);
-			len -= 16;
-			in += 16;
-			out += 16;
+			for(n=0; n < AES_BLOCK_SIZE; ++n)
+				out[n] = in[n] ^ iv[n];
+			AES_encrypt(out, out, key);
+			iv = out;
+			len -= AES_BLOCK_SIZE;
+			in += AES_BLOCK_SIZE;
+			out += AES_BLOCK_SIZE;
 		}
 		if (len) {
 			for(n=0; n < len; ++n)
-				tmp[n] = in[n] ^ ivec[n];
+				out[n] = in[n] ^ iv[n];
 			for(n=len; n < AES_BLOCK_SIZE; ++n)
-				tmp[n] = ivec[n];
-			AES_encrypt(tmp, tmp, key);
-			memcpy(out, tmp, len);
-			memcpy(ivec, tmp, 16);
-		}			
+				out[n] = iv[n];
+			AES_encrypt(out, out, key);
+			iv = out;
+		}
+		memcpy(ivec,iv,AES_BLOCK_SIZE);
+	} else if (in != out) {
+		while (len >= AES_BLOCK_SIZE) {
+			AES_decrypt(in, out, key);
+			for(n=0; n < AES_BLOCK_SIZE; ++n)
+				out[n] ^= iv[n];
+			iv = in;
+			len -= AES_BLOCK_SIZE;
+			in  += AES_BLOCK_SIZE;
+			out += AES_BLOCK_SIZE;
+		}
+		if (len) {
+			AES_decrypt(in,tmp,key);
+			for(n=0; n < len; ++n)
+				out[n] = tmp[n] ^ iv[n];
+			iv = in;
+		}
+		memcpy(ivec,iv,AES_BLOCK_SIZE);
 	} else {
 		while (len >= AES_BLOCK_SIZE) {
-			memcpy(tmp, in, 16);
+			memcpy(tmp, in, AES_BLOCK_SIZE);
 			AES_decrypt(in, out, key);
-			for(n=0; n < 16; ++n)
+			for(n=0; n < AES_BLOCK_SIZE; ++n)
 				out[n] ^= ivec[n];
-			memcpy(ivec, tmp, 16);
-			len -= 16;
-			in += 16;
-			out += 16;
+			memcpy(ivec, tmp, AES_BLOCK_SIZE);
+			len -= AES_BLOCK_SIZE;
+			in += AES_BLOCK_SIZE;
+			out += AES_BLOCK_SIZE;
 		}
 		if (len) {
-			memcpy(tmp, in, 16);
-			AES_decrypt(tmp, tmp, key);
+			memcpy(tmp, in, AES_BLOCK_SIZE);
+			AES_decrypt(tmp, out, key);
 			for(n=0; n < len; ++n)
 				out[n] ^= ivec[n];
-			memcpy(ivec, tmp, 16);
-		}			
+			for(n=len; n < AES_BLOCK_SIZE; ++n)
+				out[n] = tmp[n];
+			memcpy(ivec, tmp, AES_BLOCK_SIZE);
+		}
 	}
 }