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)));
    assert(!overlapped);
    return overlapped;
}
['static int cms_kek_cipher(unsigned char **pout, size_t *poutlen,\n                          const unsigned char *in, size_t inlen,\n                          CMS_KeyAgreeRecipientInfo *kari, int enc)\n{\n    unsigned char kek[EVP_MAX_KEY_LENGTH];\n    size_t keklen;\n    int rv = 0;\n    unsigned char *out = NULL;\n    int outlen;\n    keklen = EVP_CIPHER_CTX_key_length(kari->ctx);\n    if (keklen > EVP_MAX_KEY_LENGTH)\n        return 0;\n    if (EVP_PKEY_derive(kari->pctx, kek, &keklen) <= 0)\n        goto err;\n    if (!EVP_CipherInit_ex(kari->ctx, NULL, NULL, kek, NULL, enc))\n        goto err;\n    if (!EVP_CipherUpdate(kari->ctx, NULL, &outlen, in, inlen))\n        goto err;\n    out = OPENSSL_malloc(outlen);\n    if (out == NULL)\n        goto err;\n    if (!EVP_CipherUpdate(kari->ctx, out, &outlen, in, inlen))\n        goto err;\n    *pout = out;\n    *poutlen = (size_t)outlen;\n    rv = 1;\n err:\n    OPENSSL_cleanse(kek, keklen);\n    if (!rv)\n        OPENSSL_free(out);\n    EVP_CIPHER_CTX_reset(kari->ctx);\n    EVP_PKEY_CTX_free(kari->pctx);\n    kari->pctx = NULL;\n    return rv;\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;\n    unsigned int b;\n    b = ctx->cipher->block_size;\n    if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {\n        if (b == 1 && is_partially_overlapping(out, in, inl)) {\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    assert(!overlapped);\n    return overlapped;\n}']