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Fixes: for GH #10068 #10094

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9f2ff95
increase TLS ECH inner hello lengths to word32
sebastian-carpenter Mar 27, 2026
d754c57
improve GetMsgHash error checks
sebastian-carpenter Mar 27, 2026
8548552
add null check
sebastian-carpenter Mar 27, 2026
98a0f92
mirror arg requirements from wc_HpkeContextSealBase
sebastian-carpenter Mar 27, 2026
166ed81
fixing bad state for ech->type
sebastian-carpenter Mar 27, 2026
1f5fca5
faster key length validation when setting configs
sebastian-carpenter Mar 27, 2026
384c378
hpke testing - broke api testing into a different function
sebastian-carpenter Mar 30, 2026
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3 changes: 2 additions & 1 deletion src/ssl_ech.c
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Original file line number Diff line number Diff line change
Expand Up @@ -548,7 +548,8 @@ int SetEchConfigsEx(WOLFSSL_EchConfig** outputConfigs, void* heap,
echConfig += 2;

/* hpke public_key */
if (hpkePubkeyLen > HPKE_Npk_MAX || hpkePubkeyLen == 0) {
if (hpkePubkeyLen > HPKE_Npk_MAX ||
hpkePubkeyLen != wc_HpkeKemGetEncLen(workingConfig->kemId)) {
ret = BUFFER_E;
break;
}
Expand Down
8 changes: 5 additions & 3 deletions src/tls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13673,7 +13673,7 @@ static int TLSX_ECH_Write(WOLFSSL_ECH* ech, byte msgType, byte* writeBuf,
writeBuf_p += ech->encLen;
}
/* innerClientHelloLen */
c16toa(ech->innerClientHelloLen, writeBuf_p);
c16toa((word16)ech->innerClientHelloLen, writeBuf_p);
writeBuf_p += 2;
/* set payload offset for when we finalize */
ech->outerClientPayload = writeBuf_p;
Expand Down Expand Up @@ -14132,7 +14132,7 @@ static int TLSX_ECH_ExpandOuterExtensions(WOLFSSL* ssl, WOLFSSL_ECH* ech,
if (ret == 0) {
XFREE(ech->innerClientHello, heap, DYNAMIC_TYPE_TMP_BUFFER);
ech->innerClientHello = newInnerCh;
ech->innerClientHelloLen = (word16)newInnerChLen;
ech->innerClientHelloLen = newInnerChLen;
newInnerCh = NULL;
}

Expand Down Expand Up @@ -14246,6 +14246,7 @@ static int TLSX_ECH_Parse(WOLFSSL* ssl, const byte* readBuf, word16 size,
word32 offset = 0;
word16 len;
word16 tmpVal16;
word16 lenCh;

WOLFSSL_MSG("TLSX_ECH_Parse");
if (ssl->options.disableECH) {
Expand Down Expand Up @@ -14362,7 +14363,8 @@ static int TLSX_ECH_Parse(WOLFSSL* ssl, const byte* readBuf, word16 size,
readBuf_p += len;
offset += len;
/* read payload (encrypted CH) len */
ato16(readBuf_p, &ech->innerClientHelloLen);
ato16(readBuf_p, &lenCh);
ech->innerClientHelloLen = lenCh;
readBuf_p += 2;
offset += 2;
/* Check payload is no bigger than remaining bytes. */
Expand Down
32 changes: 24 additions & 8 deletions src/tls13.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3907,10 +3907,14 @@ static int EchCalcAcceptance(WOLFSSL* ssl, byte* label, word16 labelSz,

if (isHrr) {
/* the transcript hash of ClientHelloInner1 */
hashSz = GetMsgHash(ssl, clientHelloInnerHash);
if (hashSz > 0) {
ret = GetMsgHash(ssl, clientHelloInnerHash);
if (ret > 0) {
hashSz = ret;
ret = 0;
}
else if (ret == 0) {
ret = HASH_TYPE_E;
}

/* restart ECH transcript hash, similar to RestartHandshakeHash but
* don't add a cookie */
Expand Down Expand Up @@ -3950,6 +3954,9 @@ static int EchCalcAcceptance(WOLFSSL* ssl, byte* label, word16 labelSz,
if (ret > 0) {
ret = 0;
}
else if (ret == 0) {
ret = HASH_TYPE_E;
}
}

/* pick the right type and size based on mac_algorithm */
Expand Down Expand Up @@ -4724,8 +4731,8 @@ int SendTls13ClientHello(WOLFSSL* ssl)
args->ech->type = 0;
/* set innerClientHelloLen to ClientHelloInner + padding + tag */
args->ech->paddingLen = 31 - ((args->length - 1) % 32);
args->ech->innerClientHelloLen = (word16)(args->length +
args->ech->paddingLen + args->ech->hpke->Nt);
args->ech->innerClientHelloLen = args->length +
args->ech->paddingLen + args->ech->hpke->Nt;
/* set the length back to before we computed ClientHelloInner size */
args->length = (word32)args->preXLength;
}
Expand Down Expand Up @@ -4867,8 +4874,10 @@ int SendTls13ClientHello(WOLFSSL* ssl)
args->ech->innerClientHello =
(byte*)XMALLOC(args->ech->innerClientHelloLen - args->ech->hpke->Nt,
ssl->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (args->ech->innerClientHello == NULL)
if (args->ech->innerClientHello == NULL) {
args->ech->type = ECH_TYPE_OUTER;
return MEMORY_E;
}
/* set the padding bytes to 0 */
XMEMSET(args->ech->innerClientHello + args->ech->innerClientHelloLen -
args->ech->hpke->Nt - args->ech->paddingLen, 0,
Expand All @@ -4891,8 +4900,10 @@ int SendTls13ClientHello(WOLFSSL* ssl)
/* change the outer client random */
ret = wc_RNG_GenerateBlock(ssl->rng, args->output +
args->clientRandomOffset, RAN_LEN);
if (ret != 0)
if (ret != 0) {
args->ech->type = ECH_TYPE_OUTER;
return ret;
}
/* copy the new client random */
XMEMCPY(ssl->arrays->clientRandom, args->output +
args->clientRandomOffset, RAN_LEN);
Expand All @@ -4901,10 +4912,10 @@ int SendTls13ClientHello(WOLFSSL* ssl)
ret = TLSX_WriteRequest(ssl, args->ech->innerClientHello + args->idx -
(RECORD_HEADER_SZ + HANDSHAKE_HEADER_SZ), client_hello,
&args->length);
/* set the type to outer */
args->ech->type = ECH_TYPE_OUTER;
if (ret != 0)
return ret;
/* set the type to outer */
args->ech->type = 0;
}
#endif

Expand Down Expand Up @@ -5650,6 +5661,9 @@ int DoTls13ServerHello(WOLFSSL* ssl, const byte* input, word32* inOutIdx,
/* check for acceptConfirmation */
if (ssl->echConfigs != NULL && !ssl->options.disableECH) {
args->echX = TLSX_Find(ssl->extensions, TLSX_ECH);
if (args->echX == NULL || args->echX->data == NULL)
return WOLFSSL_FATAL_ERROR;

/* account for hrr extension instead of server random */
if (args->extMsgType == hello_retry_request) {
args->acceptOffset =
Expand Down Expand Up @@ -8563,6 +8577,8 @@ int CreateSigData(WOLFSSL* ssl, byte* sigData, word16* sigDataSz,
ret = GetMsgHash(ssl, &sigData[idx]);
if (ret < 0)
return ret;
if (ret == 0)
return HASH_TYPE_E;

*sigDataSz = (word16)(idx + ret);
ret = 0;
Expand Down
9 changes: 5 additions & 4 deletions wolfcrypt/src/hpke.c
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Original file line number Diff line number Diff line change
Expand Up @@ -917,7 +917,7 @@ int wc_HpkeInitSealContext(Hpke* hpke, HpkeBaseContext* context,
void* ephemeralKey, void* receiverKey, byte* info, word32 infoSz)
{
if (hpke == NULL || context == NULL || ephemeralKey == NULL ||
receiverKey == NULL || (info == NULL && infoSz > 0)) {
receiverKey == NULL || (info == NULL && infoSz != 0)) {
return BAD_FUNC_ARG;
}

Expand All @@ -935,7 +935,7 @@ int wc_HpkeContextSealBase(Hpke* hpke, HpkeBaseContext* context,
int ret;
byte nonce[HPKE_Nn_MAX];
WC_DECLARE_VAR(aes, Aes, 1, 0);
if (hpke == NULL || context == NULL || (aad == NULL && aadSz > 0) ||
if (hpke == NULL || context == NULL || (aad == NULL && aadSz != 0) ||
plaintext == NULL || out == NULL) {
return BAD_FUNC_ARG;
}
Expand Down Expand Up @@ -1160,7 +1160,7 @@ int wc_HpkeInitOpenContext(Hpke* hpke, HpkeBaseContext* context,
word32 infoSz)
{
if (hpke == NULL || context == NULL || receiverKey == NULL || pubKey == NULL
|| (info == NULL && infoSz > 0)) {
|| (info == NULL && infoSz != 0)) {
return BAD_FUNC_ARG;
}

Expand All @@ -1175,7 +1175,8 @@ int wc_HpkeContextOpenBase(Hpke* hpke, HpkeBaseContext* context, byte* aad,
int ret;
byte nonce[HPKE_Nn_MAX];
WC_DECLARE_VAR(aes, Aes, 1, 0);
if (hpke == NULL) {
if (hpke == NULL || context == NULL || (aad == NULL && aadSz != 0) ||
ciphertext == NULL || out == NULL) {
return BAD_FUNC_ARG;
}

Expand Down
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