From: Andy Polyakov <appro@openssl.org>
Date: Tue, 18 Jan 2005 00:26:52 +0000 (+0000)
Subject: Don't zap AES CBC IV, when decrypting truncated content in place.
X-Git-Tag: OpenSSL_0_9_7g~17^2~70
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=90cc40911b031d9ae4597fd2b66c6fd24de2f9d9;p=openssl

Don't zap AES CBC IV, when decrypting truncated content in place.
---

diff --git a/crypto/aes/aes_cbc.c b/crypto/aes/aes_cbc.c
index f909aaf47a..d2ba6bcdb4 100644
--- a/crypto/aes/aes_cbc.c
+++ b/crypto/aes/aes_cbc.c
@@ -120,9 +120,11 @@ 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);
 		}
 	}