SEED to support OPENSSL_SMALL_FOOTPRINT: ~2x size decrease on x86.

diff --git a/crypto/seed/seed.c b/crypto/seed/seed.c
index 490cddfe7eeef11802b08738ae3523d5af3dc209..2bc384a19f0e206d249b1a6746ad9426d40ec096 100644 (file)
--- a/crypto/seed/seed.c
+++ b/crypto/seed/seed.c
@@ -187,6 +187,11 @@ static const seed_word SS[4][256] = {      {
 #define KC14    0xde6e678d
 #define KC15    0xbcdccf1b
 
+#if defined(OPENSSL_SMALL_FOOTPRINT)
+static const seed_word KC[] = {
+       KC0,    KC1,    KC2,    KC3,    KC4,    KC5,    KC6,    KC7,
+       KC8,    KC9,    KC10,   KC11,   KC12,   KC13,   KC14,   KC15    };
+#endif
 
 void SEED_set_key(const unsigned char rawkey[SEED_KEY_LENGTH], SEED_KEY_SCHEDULE *ks)
 {
@@ -201,6 +206,8 @@ void SEED_set_key(const unsigned char rawkey[SEED_KEY_LENGTH], SEED_KEY_SCHEDULE
        t0 = (x1 + x3 - KC0) & 0xffffffff;
        t1 = (x2 - x4 + KC0) & 0xffffffff;                     KEYUPDATE_TEMP(t0, t1, &ks->data[0]);
        KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC1);      KEYUPDATE_TEMP(t0, t1, &ks->data[2]);
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
        KEYSCHEDULE_UPDATE0(t0, t1, x1, x2, x3, x4, KC2);      KEYUPDATE_TEMP(t0, t1, &ks->data[4]);
        KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC3);      KEYUPDATE_TEMP(t0, t1, &ks->data[6]);
        KEYSCHEDULE_UPDATE0(t0, t1, x1, x2, x3, x4, KC4);      KEYUPDATE_TEMP(t0, t1, &ks->data[8]);
@@ -215,6 +222,17 @@ void SEED_set_key(const unsigned char rawkey[SEED_KEY_LENGTH], SEED_KEY_SCHEDULE
        KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC13);     KEYUPDATE_TEMP(t0, t1, &ks->data[26]);
        KEYSCHEDULE_UPDATE0(t0, t1, x1, x2, x3, x4, KC14);     KEYUPDATE_TEMP(t0, t1, &ks->data[28]);
        KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC15);     KEYUPDATE_TEMP(t0, t1, &ks->data[30]);
+#else
+       {
+           int i;
+           for (i=2; i<16; i+=2) {
+               KEYSCHEDULE_UPDATE0(t0, t1, x1, x2, x3, x4, KC[i]);
+               KEYUPDATE_TEMP(t0, t1, &ks->data[i*2]);
+               KEYSCHEDULE_UPDATE1(t0, t1, x1, x2, x3, x4, KC[i+1]);
+               KEYUPDATE_TEMP(t0, t1, &ks->data[i*2+2]);
+           }
+       }
+#endif
 }
 
 void SEED_encrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_BLOCK_SIZE], const SEED_KEY_SCHEDULE *ks)
@@ -226,7 +244,8 @@ void SEED_encrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_B
        char2word(s+4,  x2);
        char2word(s+8,  x3);
        char2word(s+12, x4);
-       
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)  
        E_SEED(t0, t1, x1, x2, x3, x4, 0);
        E_SEED(t0, t1, x3, x4, x1, x2, 2);
        E_SEED(t0, t1, x1, x2, x3, x4, 4);
@@ -243,6 +262,15 @@ void SEED_encrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_B
        E_SEED(t0, t1, x3, x4, x1, x2, 26);
        E_SEED(t0, t1, x1, x2, x3, x4, 28);
        E_SEED(t0, t1, x3, x4, x1, x2, 30);
+#else
+       {
+           int i;
+           for (i=0;i<30;i+=4) {
+               E_SEED(t0,t1,x1,x2,x3,x4,i);
+               E_SEED(t0,t1,x3,x4,x1,x2,i+2);
+           }
+       }
+#endif
 
        word2char(x3, d);
        word2char(x4, d+4);
@@ -259,7 +287,8 @@ void SEED_decrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_B
        char2word(s+4,  x2);
        char2word(s+8,  x3);
        char2word(s+12, x4);
-       
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
        E_SEED(t0, t1, x1, x2, x3, x4, 30);
        E_SEED(t0, t1, x3, x4, x1, x2, 28);
        E_SEED(t0, t1, x1, x2, x3, x4, 26);
@@ -276,6 +305,16 @@ void SEED_decrypt(const unsigned char s[SEED_BLOCK_SIZE], unsigned char d[SEED_B
        E_SEED(t0, t1, x3, x4, x1, x2, 4);
        E_SEED(t0, t1, x1, x2, x3, x4, 2);
        E_SEED(t0, t1, x3, x4, x1, x2, 0);
+#else
+       {
+           int i;
+           for (i=30; i>0; i-=4) {
+               E_SEED(t0, t1, x1, x2, x3, x4, i);
+               E_SEED(t0, t1, x3, x4, x1, x2, i-2);
+
+           }
+       }
+#endif
 
        word2char(x3, d);
        word2char(x4, d+4);