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ecc: reject compressed EC points with incorrect length #9985

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ecc: reject compressed EC points with incorrect length #9985

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9 changes: 8 additions & 1 deletion wolfcrypt/src/ecc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9469,7 +9469,14 @@ int wc_ecc_import_point_der_ex(const byte* in, word32 inLen,

if (pointType == ECC_POINT_COMP_EVEN || pointType == ECC_POINT_COMP_ODD) {
#ifdef HAVE_COMP_KEY
compressed = 1;
/* Compressed point must be exactly 1 + field_element_size bytes.
* Reject truncated inputs (e.g. a bare 0x02/0x03 byte). */
if (inLen == (word32)ecc_sets[curve_idx].size + 1) {
compressed = 1;
}
else {
err = ECC_BAD_ARG_E;
}
#else
err = NOT_COMPILED_IN;
#endif
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