libsec: remove unused aes_setupDec

diff --git a/sys/src/libsec/port/aes.c b/sys/src/libsec/port/aes.c
index 4a9e6dd4e4098e62254c6e6fb9a05181a70f55f7..417920354b433177864041921c18da520d9dff16 100644 (file)
--- a/sys/src/libsec/port/aes.c
+++ b/sys/src/libsec/port/aes.c
@@ -59,8 +59,6 @@ static uchar basekey[3][16] = {
 
 static int aes_setupEnc(ulong rk[/*4*(Nr + 1)*/], const uchar cipherKey[],
                int keyBits);
-static int aes_setupDec(ulong rk[/*4*(Nr + 1)*/], const uchar cipherKey[],
-               int keyBits);
 static int aes_setup(ulong erk[/*4*(Nr + 1)*/], ulong drk[/*4*(Nr + 1)*/],
                const uchar cipherKey[], int keyBits);
 
@@ -1049,56 +1047,6 @@ aes_setupEnc(ulong rk[/*4*(Nr + 1)*/], const uchar cipherKey[], int keyBits)
        return 0;
 }
 
-/**
- * Expand the cipher key into the decryption key schedule.
- *
- * @return     the number of rounds for the given cipher key size.
- */
-static int
-aes_setupDec(ulong rk[/* 4*(Nr + 1) */], const uchar cipherKey[], int keyBits)
-{
-       int Nr, i, j;
-       ulong temp;
-
-       /* expand the cipher key: */
-       Nr = aes_setupEnc(rk, cipherKey, keyBits);
-       /* invert the order of the round keys: */
-       for (i = 0, j = 4*Nr; i < j; i += 4, j -= 4) {
-               temp = rk[i    ]; rk[i    ] = rk[j    ]; rk[j    ] = temp;
-               temp = rk[i + 1]; rk[i + 1] = rk[j + 1]; rk[j + 1] = temp;
-               temp = rk[i + 2]; rk[i + 2] = rk[j + 2]; rk[j + 2] = temp;
-               temp = rk[i + 3]; rk[i + 3] = rk[j + 3]; rk[j + 3] = temp;
-       }
-       /*
-        * apply the inverse MixColumn transform to all round keys
-        * but the first and the last:
-        */
-       for (i = 1; i < Nr; i++) {
-               rk += 4;
-               rk[0] =
-                       Td0[Te4[(rk[0] >> 24)       ]] ^
-                       Td1[Te4[(rk[0] >> 16) & 0xff]] ^
-                       Td2[Te4[(rk[0] >>  8) & 0xff]] ^
-                       Td3[Te4[(rk[0]      ) & 0xff]];
-               rk[1] =
-                       Td0[Te4[(rk[1] >> 24)       ]] ^
-                       Td1[Te4[(rk[1] >> 16) & 0xff]] ^
-                       Td2[Te4[(rk[1] >>  8) & 0xff]] ^
-                       Td3[Te4[(rk[1]      ) & 0xff]];
-               rk[2] =
-                       Td0[Te4[(rk[2] >> 24)       ]] ^
-                       Td1[Te4[(rk[2] >> 16) & 0xff]] ^
-                       Td2[Te4[(rk[2] >>  8) & 0xff]] ^
-                       Td3[Te4[(rk[2]      ) & 0xff]];
-               rk[3] =
-                       Td0[Te4[(rk[3] >> 24)       ]] ^
-                       Td1[Te4[(rk[3] >> 16) & 0xff]] ^
-                       Td2[Te4[(rk[3] >>  8) & 0xff]] ^
-                       Td3[Te4[(rk[3]      ) & 0xff]];
-       }
-       return Nr;
-}
-
 /* using round keys in rk, perform Nr rounds of encrypting pt into ct */
 void
 aes_encrypt(const ulong rk[/* 4*(Nr + 1) */], int Nr, const uchar pt[16],