int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
{
    PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
    int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
                                                (diff > (0 - (PTRDIFF_T)len)));
    return overlapped;
}
['static int ctr_update(RAND_DRBG *drbg,\n                             const unsigned char *in1, size_t in1len,\n                             const unsigned char *in2, size_t in2len,\n                             const unsigned char *nonce, size_t noncelen)\n{\n    RAND_DRBG_CTR *ctr = &drbg->data.ctr;\n    int outlen = AES_BLOCK_SIZE;\n    inc_128(ctr);\n    if (!EVP_CipherUpdate(ctr->ctx, ctr->K, &outlen, ctr->V, AES_BLOCK_SIZE)\n        || outlen != AES_BLOCK_SIZE)\n        return 0;\n    if (ctr->keylen != 16) {\n        inc_128(ctr);\n        if (!EVP_CipherUpdate(ctr->ctx, ctr->K+16, &outlen, ctr->V,\n                              AES_BLOCK_SIZE)\n            || outlen != AES_BLOCK_SIZE)\n            return 0;\n    }\n    inc_128(ctr);\n    if (!EVP_CipherUpdate(ctr->ctx, ctr->V, &outlen, ctr->V, AES_BLOCK_SIZE)\n        || outlen != AES_BLOCK_SIZE)\n        return 0;\n    if (ctr->keylen == 24) {\n        memcpy(ctr->V + 8, ctr->V, 8);\n        memcpy(ctr->V, ctr->K + 24, 8);\n    }\n    if ((drbg->flags & RAND_DRBG_FLAG_CTR_NO_DF) == 0) {\n        if (in1 != NULL || nonce != NULL || in2 != NULL)\n            if (!ctr_df(ctr, in1, in1len, nonce, noncelen, in2, in2len))\n                return 0;\n        if (in1len)\n            ctr_XOR(ctr, ctr->KX, drbg->seedlen);\n    } else {\n        ctr_XOR(ctr, in1, in1len);\n        ctr_XOR(ctr, in2, in2len);\n    }\n    if (!EVP_CipherInit_ex(ctr->ctx, ctr->cipher, NULL, ctr->K, NULL, 1))\n        return 0;\n    return 1;\n}', 'int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,\n                     const unsigned char *in, int inl)\n{\n    if (ctx->encrypt)\n        return EVP_EncryptUpdate(ctx, out, outl, in, inl);\n    else\n        return EVP_DecryptUpdate(ctx, out, outl, in, inl);\n}', 'int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,\n                      const unsigned char *in, int inl)\n{\n    int fix_len, cmpl = inl;\n    unsigned int b;\n    b = ctx->cipher->block_size;\n    if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))\n        cmpl = (cmpl + 7) / 8;\n    if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {\n        if (b == 1 && is_partially_overlapping(out, in, cmpl)) {\n            EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);\n            return 0;\n        }\n        fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);\n        if (fix_len < 0) {\n            *outl = 0;\n            return 0;\n        } else\n            *outl = fix_len;\n        return 1;\n    }\n    if (inl <= 0) {\n        *outl = 0;\n        return inl == 0;\n    }\n    if (ctx->flags & EVP_CIPH_NO_PADDING)\n        return EVP_EncryptUpdate(ctx, out, outl, in, inl);\n    OPENSSL_assert(b <= sizeof(ctx->final));\n    if (ctx->final_used) {\n        if (((PTRDIFF_T)out == (PTRDIFF_T)in)\n            || is_partially_overlapping(out, in, b)) {\n            EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);\n            return 0;\n        }\n        memcpy(out, ctx->final, b);\n        out += b;\n        fix_len = 1;\n    } else\n        fix_len = 0;\n    if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))\n        return 0;\n    if (b > 1 && !ctx->buf_len) {\n        *outl -= b;\n        ctx->final_used = 1;\n        memcpy(ctx->final, &out[*outl], b);\n    } else\n        ctx->final_used = 0;\n    if (fix_len)\n        *outl += b;\n    return 1;\n}', 'int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)\n{\n    PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;\n    int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |\n                                                (diff > (0 - (PTRDIFF_T)len)));\n    return overlapped;\n}']