static int ctr_BCC_final(RAND_DRBG_CTR *ctr)
{
    if (ctr->bltmp_pos) {
        memset(ctr->bltmp + ctr->bltmp_pos, 0, 16 - ctr->bltmp_pos);
        if (!ctr_BCC_blocks(ctr, ctr->bltmp))
            return 0;
    }
    return 1;
}
['static int ctr_df(RAND_DRBG_CTR *ctr,\n                         const unsigned char *in1, size_t in1len,\n                         const unsigned char *in2, size_t in2len,\n                         const unsigned char *in3, size_t in3len)\n{\n    static unsigned char c80 = 0x80;\n    size_t inlen;\n    unsigned char *p = ctr->bltmp;\n    int outlen = AES_BLOCK_SIZE;\n    if (!ctr_BCC_init(ctr))\n        return 0;\n    if (in1 == NULL)\n        in1len = 0;\n    if (in2 == NULL)\n        in2len = 0;\n    if (in3 == NULL)\n        in3len = 0;\n    inlen = in1len + in2len + in3len;\n    *p++ = (inlen >> 24) & 0xff;\n    *p++ = (inlen >> 16) & 0xff;\n    *p++ = (inlen >> 8) & 0xff;\n    *p++ = inlen & 0xff;\n    *p++ = 0;\n    *p++ = 0;\n    *p++ = 0;\n    *p = (unsigned char)((ctr->keylen + 16) & 0xff);\n    ctr->bltmp_pos = 8;\n    if (!ctr_BCC_update(ctr, in1, in1len)\n        || !ctr_BCC_update(ctr, in2, in2len)\n        || !ctr_BCC_update(ctr, in3, in3len)\n        || !ctr_BCC_update(ctr, &c80, 1)\n        || !ctr_BCC_final(ctr))\n        return 0;\n    if (!EVP_CipherInit_ex(ctr->ctx, ctr->cipher, NULL, ctr->KX, NULL, 1))\n        return 0;\n    if (!EVP_CipherUpdate(ctr->ctx, ctr->KX, &outlen, ctr->KX + ctr->keylen,\n                          AES_BLOCK_SIZE)\n        || outlen != AES_BLOCK_SIZE)\n        return 0;\n    if (!EVP_CipherUpdate(ctr->ctx, ctr->KX + 16, &outlen, ctr->KX,\n                          AES_BLOCK_SIZE)\n        || outlen != AES_BLOCK_SIZE)\n        return 0;\n    if (ctr->keylen != 16)\n        if (!EVP_CipherUpdate(ctr->ctx, ctr->KX + 32, &outlen, ctr->KX + 16,\n                              AES_BLOCK_SIZE)\n            || outlen != AES_BLOCK_SIZE)\n            return 0;\n    return 1;\n}', 'static int ctr_BCC_update(RAND_DRBG_CTR *ctr,\n                                 const unsigned char *in, size_t inlen)\n{\n    if (in == NULL || inlen == 0)\n        return 1;\n    if (ctr->bltmp_pos) {\n        size_t left = 16 - ctr->bltmp_pos;\n        if (inlen >= left) {\n            memcpy(ctr->bltmp + ctr->bltmp_pos, in, left);\n            if (!ctr_BCC_blocks(ctr, ctr->bltmp))\n                return 0;\n            ctr->bltmp_pos = 0;\n            inlen -= left;\n            in += left;\n        }\n    }\n    for (; inlen >= 16; in += 16, inlen -= 16) {\n        if (!ctr_BCC_blocks(ctr, in))\n            return 0;\n    }\n    if (inlen > 0) {\n        memcpy(ctr->bltmp + ctr->bltmp_pos, in, inlen);\n        ctr->bltmp_pos += inlen;\n    }\n    return 1;\n}', 'static int ctr_BCC_final(RAND_DRBG_CTR *ctr)\n{\n    if (ctr->bltmp_pos) {\n        memset(ctr->bltmp + ctr->bltmp_pos, 0, 16 - ctr->bltmp_pos);\n        if (!ctr_BCC_blocks(ctr, ctr->bltmp))\n            return 0;\n    }\n    return 1;\n}']