ar1s code in my gist

gistfile1.c

void compute_session_keys(uint8_t encryptkey[AES128_KEY_LEN],
                uint8_t IV[AES128_KEY_LEN],
                uint8_t integrity[AES128_KEY_LEN],
                uint8_t master_key[AES128_KEY_LEN],
                uint8_t encryption_salt[8]){
 
        uint8_t long_encryptkey[SHA256_DIGEST_LEN];
        uint8_t long_IV[SHA256_DIGEST_LEN];
        uint8_t long_integrity[SHA256_DIGEST_LEN];
 
        HMAC_SHA256_CTX ctx;
 
        HMAC_SHA256_Init(&ctx, master_key, sizeof(master_key));
        HMAC_SHA256_Update(&ctx,encryption_salt, 8);
        HMAC_SHA256_Update(&ctx, "encryption", 10);
        HMAC_SHA256_Final(long_encryptkey, &ctx);
 
        HMAC_SHA256_Init(&ctx, master_key, sizeof(master_key));
        HMAC_SHA256_Update(&ctx,encryption_salt, 8);
        HMAC_SHA256_Update(&ctx, "IV", 2);
        HMAC_SHA256_Final(long_IV, &ctx);
 
        HMAC_SHA256_Init(&ctx, master_key, sizeof(master_key));
        HMAC_SHA256_Update(&ctx,encryption_salt, 8);
        HMAC_SHA256_Update(&ctx, "integrity", 9);
        HMAC_SHA256_Final(long_integrity, &ctx);
 
        memcpy(encryptkey, long_encryptkey, AES128_KEY_LEN);
        memcpy(IV, long_IV, AES128_KEY_LEN);
        memcpy(integrity, long_integrity, AES128_KEY_LEN);
        ZERO(long_encryptkey);
        ZERO(long_IV);
        ZERO(long_integrity);
        ZERO(ctx);
}

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