Fix block cipher padding when using libgcrypt.

diff --git a/src/gcrypt/cipher.c b/src/gcrypt/cipher.c
index 2e8e057..390959c 100644 (file)
--- a/src/gcrypt/cipher.c
+++ b/src/gcrypt/cipher.c
@@ -196,7 +196,7 @@ bool cipher_encrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou
                if(!oneshot)
                        return false;
 
-               size_t reqlen = ((inlen + 1) / cipher->blklen) * cipher->blklen;
+               size_t reqlen = ((inlen + 8) / cipher->blklen) * cipher->blklen;
                uint8_t padbyte = reqlen - inlen;
                inlen = reqlen - cipher->blklen;
 
@@ -239,14 +239,18 @@ bool cipher_decrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou
 
                uint8_t padbyte = ((uint8_t *)outdata)[inlen - 1];
 
-               if(padbyte == 0 || padbyte > cipher->blklen || padbyte > inlen)
+               if(padbyte == 0 || padbyte > cipher->blklen || padbyte > inlen) {
+                       logger(LOG_ERR, "Error while decrypting: invalid padding");
                        return false;
+               }
 
                size_t origlen = inlen - padbyte;
 
                for(int i = inlen - 1; i >= origlen; i--)
-                       if(((uint8_t *)indata)[i] != padbyte)
+                       if(((uint8_t *)outdata)[i] != padbyte) {
+                               logger(LOG_ERR, "Error while decrypting: invalid padding");
                                return false;
+                       }
 
                *outlen = origlen;
        }