Problem - Kevin Tafuro

unsigned char c1[SPC_BLOCK_SZ]; /* L * u */
unsigned char c2[SPC_BLOCK_SZ]; /* L / u */
} SPC_OMAC_CTX;
int spc_omac1_init(SPC_OMAC_CTX *ctx, unsigned char *key, int keylen) {
int condition, i;
unsigned char L[SPC_BLOCK_SZ] = {0,};
if (keylen != 16 && keylen != 24 && keylen != 32) return 0;
SPC_ENCRYPT_INIT(&(ctx->ks), key, keylen);
SPC_DO_ENCRYPT(&(ctx->ks), L, L);
spc_memset(ctx->iv, 0, SPC_BLOCK_SZ);
ctx->ix = 0;
/* Compute L * u */
condition = L[0] & 0x80;
ctx->c1[0] = L[0] c1[i - 1] |= L[i] >> 7;
ctx->c1[i] = L[i] c1[SPC_BLOCK_SZ - 1] ^= 0x87;
/* Compute L * u * u */
condition = ctx->c1[0] & 0x80;
ctx->c2[0] = ctx->c1[0] c2[i - 1] |= ctx->c1[i] >> 7;
ctx->c2[i] = ctx->c1[i] c2[SPC_BLOCK_SZ - 1] ^= 0x87;
spc_memset(L, 0, SPC_BLOCK_SZ);
return 1;
}
int spc_omac2_init(SPC_OMAC_CTX *ctx, unsigned char *key, int keylen) {
int condition, i;
unsigned char L[SPC_BLOCK_SZ] = {0,};
if (keylen != 16 && keylen != 24 && keylen != 32) return 0;
SPC_ENCRYPT_INIT(&(ctx->ks), key, keylen);
SPC_DO_ENCRYPT(&(ctx->ks), L, L);
spc_memset(ctx->iv, 0, SPC_BLOCK_SZ);
ctx->ix = 0;
/* Compute L * u, storing it in c1 */
condition = L[0] >> 7;
ctx->c1[0] = L[0] c1[i - 1] |= L[i] >> 7;
ctx->c1[i] = L[i]