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// I mean if OpenSSL doesn't include it...
// released under GPLv3, see http://gplv3.fsf.org/
void rol1(u8* worthless) {
int i;
u8 xor = (worthless[0]&0x80)?0x87:0;
for(i=0;i<0xF;i++) {
worthless[i] <<= 1;
worthless[i] |= worthless[i+1]>>7;
}
worthless[0xF] <<= 1;
worthless[0xF] ^= xor;
}
void aesOmac1Mode(u8* output, u8* input, int len, u8* aes_key_data, int aes_key_bits) {
int i,j;
AES_KEY aes_key;
AES_set_encrypt_key(aes_key_data, aes_key_bits, &aes_key);
u8 running[0x10]; memset(running, 0, 0x10);
u8 hash[0x10];
u8 worthless[0x10];
u8 final[0x10];
AES_encrypt(running, worthless, &aes_key);
rol1(worthless);
if(len > 0x10) {
for(i=0;i<(len-0x10);i+=0x10) {
for(j=0;j<0x10;j++) hash[j] = running[j] ^ input[i+j];
AES_encrypt(hash, running, &aes_key);
}
}
int overrun = len&0xF;
if( (len%0x10) == 0 ) overrun = 0x10;
memset(hash, 0, 0x10);
memcpy(hash, &input[i], overrun);
if(overrun != 0x10) {
hash[overrun] = 0x80;
rol1(worthless);
}
for(j=0;j<0x10;j++) hash[j] ^= running[j] ^ worthless[j];
AES_encrypt(hash, output, &aes_key);
}
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