X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Faes%2Faes_cbc.c;h=d2ba6bcdb4659d1ed9c6a01a898b08e167e0f2ef;hb=71fc9b37aedb0ee7e664fba53696a11d0b879dd7;hp=1222a21002c1add66fcfbf5fe57c84475838102b;hpb=4e952ae4fc33a1c3a39e082dcb139c5560128ce8;p=oweals%2Fopenssl.git

diff --git a/crypto/aes/aes_cbc.c b/crypto/aes/aes_cbc.c
index 1222a21002..d2ba6bcdb4 100644
--- a/crypto/aes/aes_cbc.c
+++ b/crypto/aes/aes_cbc.c
@@ -66,6 +66,7 @@ void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
 	unsigned long n;
 	unsigned long len = length;
 	unsigned char tmp[AES_BLOCK_SIZE];
+	const unsigned char *iv = ivec;
 
 	assert(in && out && key && ivec);
 	assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
@@ -73,22 +74,39 @@ void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
 	if (AES_ENCRYPT == enc) {
 		while (len >= AES_BLOCK_SIZE) {
 			for(n=0; n < AES_BLOCK_SIZE; ++n)
-				tmp[n] = in[n] ^ ivec[n];
-			AES_encrypt(tmp, out, key);
-			memcpy(ivec, out, AES_BLOCK_SIZE);
+				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, AES_BLOCK_SIZE);
-			memcpy(ivec, tmp, AES_BLOCK_SIZE);
-		}			
+				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, AES_BLOCK_SIZE);
@@ -102,10 +120,12 @@ void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
 		}
 		if (len) {
 			memcpy(tmp, in, AES_BLOCK_SIZE);
-			AES_decrypt(tmp, tmp, key);
+			AES_decrypt(tmp, out, key);
 			for(n=0; n < len; ++n)
-				out[n] = tmp[n] ^ ivec[n];
+				out[n] ^= ivec[n];
+			for(n=len; n < AES_BLOCK_SIZE; ++n)
+				out[n] = tmp[n];
 			memcpy(ivec, tmp, AES_BLOCK_SIZE);
-		}			
+		}
 	}
 }