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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented:
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<p dir="auto">The libtasn1 node contains the following:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">#define ASN1_SMALL_VALUE_SIZE 16</span>
<span id="LC2" class="line" lang="plaintext">struct asn1_node_st</span>
<span id="LC3" class="line" lang="plaintext">{</span>
<span id="LC4" class="line" lang="plaintext"> /* public fields: */</span>
<span id="LC5" class="line" lang="plaintext"> char name[ASN1_MAX_NAME_SIZE + 1]; /* Node name */</span>
<span id="LC6" class="line" lang="plaintext"> unsigned int name_hash;</span>
<span id="LC7" class="line" lang="plaintext"> unsigned int type; /* Node type */</span>
<span id="LC8" class="line" lang="plaintext"> unsigned char *value; /* Node value */</span>
<span id="LC9" class="line" lang="plaintext"> int value_len;</span>
<span id="LC10" class="line" lang="plaintext"> asn1_node down; /* Pointer to the son node */</span>
<span id="LC11" class="line" lang="plaintext"> asn1_node right; /* Pointer to the brother node */</span>
<span id="LC12" class="line" lang="plaintext"> asn1_node left; /* Pointer to the next list element */</span>
<span id="LC13" class="line" lang="plaintext"> /* private fields: */</span>
<span id="LC14" class="line" lang="plaintext"> unsigned char small_value[ASN1_SMALL_VALUE_SIZE]; /* For small values */</span>
<span id="LC15" class="line" lang="plaintext"></span>
<span id="LC16" class="line" lang="plaintext"> /* values used during decoding/coding */</span>
<span id="LC17" class="line" lang="plaintext"> int tmp_ival;</span>
<span id="LC18" class="line" lang="plaintext"> unsigned start; /* the start of the DER sequence - if decoded */</span>
<span id="LC19" class="line" lang="plaintext"> unsigned end; /* the end of the DER sequence - if decoded */</span>
<span id="LC20" class="line" lang="plaintext">};</span></code></pre>
<p dir="auto">It can store data <16 bytes inside the node (small_value), or allocate more data if larger. That from what you write seems to be related to allocated data in <code>_asn1_set_value</code>.</p>
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