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;
}
['int tls13_enc(SSL *s, SSL3_RECORD *recs, size_t n_recs, int send)\n{\n    EVP_CIPHER_CTX *ctx;\n    unsigned char iv[EVP_MAX_IV_LENGTH];\n    size_t ivlen, offset, loop;\n    unsigned char *staticiv;\n    unsigned char *seq;\n    int lenu, lenf;\n    SSL3_RECORD *rec = &recs[0];\n    if (n_recs != 1) {\n        return -1;\n    }\n    if (send) {\n        ctx = s->enc_write_ctx;\n        staticiv = s->write_iv;\n        seq = RECORD_LAYER_get_write_sequence(&s->rlayer);\n    } else {\n        ctx = s->enc_read_ctx;\n        staticiv = s->read_iv;\n        seq = RECORD_LAYER_get_read_sequence(&s->rlayer);\n    }\n    if (ctx == NULL) {\n        memmove(rec->data, rec->input, rec->length);\n        rec->input = rec->data;\n        return 1;\n    }\n    ivlen = EVP_CIPHER_CTX_iv_length(ctx);\n    if (!send) {\n        if (rec->length < EVP_GCM_TLS_TAG_LEN)\n            return 0;\n        rec->length -= EVP_GCM_TLS_TAG_LEN;\n    }\n    if (ivlen < SEQ_NUM_SIZE) {\n        return -1;\n    }\n    offset = ivlen - SEQ_NUM_SIZE;\n    memcpy(iv, staticiv, offset);\n    for (loop = 0; loop < SEQ_NUM_SIZE; loop++)\n        iv[offset + loop] = staticiv[offset + loop] ^ seq[loop];\n    for (loop = SEQ_NUM_SIZE; loop > 0; loop--) {\n        ++seq[loop - 1];\n        if (seq[loop - 1] != 0)\n            break;\n    }\n    if (loop == 0) {\n        return -1;\n    }\n    if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, send) <= 0\n            || EVP_CipherUpdate(ctx, rec->data, &lenu, rec->input,\n                                (unsigned int)rec->length) <= 0\n            || (!send && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,\n                                             EVP_GCM_TLS_TAG_LEN,\n                                             rec->data + rec->length) <= 0)\n            || EVP_CipherFinal_ex(ctx, rec->data + lenu, &lenf) <= 0\n            || (size_t)(lenu + lenf) != rec->length) {\n        return -1;\n    }\n    if (send) {\n        if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, EVP_GCM_TLS_TAG_LEN,\n                                rec->data + rec->length) <= 0)\n            return -1;\n        rec->length += EVP_GCM_TLS_TAG_LEN;\n    }\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;\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    return overlapped;\n}']