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PK callbacks: add build option to give full data to TLS 1.3 RSA-PSS sign callback instead of hash #7823

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Sep 12, 2024
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PK callbacks: add build option to give full data to TLS 1.3 RSA-PSS sign callback instead of hash #7823

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34 changes: 29 additions & 5 deletions src/tls13.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8759,6 +8759,10 @@ typedef struct Scv13Args {
byte sigAlgo;
byte* sigData;
word16 sigDataSz;
#ifndef NO_RSA
byte* toSign; /* not allocated */
word32 toSignSz;
#endif
#ifdef WOLFSSL_DUAL_ALG_CERTS
byte altSigAlgo;
word32 altSigLen; /* Only used in the case of both native and alt. */
Expand Down Expand Up @@ -9313,7 +9317,17 @@ static int SendTls13CertificateVerify(WOLFSSL* ssl)
#endif /* HAVE_DILITHIUM */
#ifndef NO_RSA
if (ssl->hsType == DYNAMIC_TYPE_RSA) {
ret = RsaSign(ssl, rsaSigBuf->buffer, (word32)rsaSigBuf->length,
args->toSign = rsaSigBuf->buffer;
args->toSignSz = (word32)rsaSigBuf->length;
#if defined(HAVE_PK_CALLBACKS) && \
defined(TLS13_RSA_PSS_SIGN_CB_NO_PREHASH)
/* Pass full data to sign (args->sigData), not hash of */
if (ssl->ctx->RsaPssSignCb) {
args->toSign = args->sigData;
args->toSignSz = args->sigDataSz;
}
#endif
ret = RsaSign(ssl, (const byte*)args->toSign, args->toSignSz,
sigOut, &args->sigLen, args->sigAlgo,
ssl->options.hashAlgo, (RsaKey*)ssl->hsKey,
ssl->buffers.key);
Expand Down Expand Up @@ -9357,10 +9371,20 @@ static int SendTls13CertificateVerify(WOLFSSL* ssl)
#endif /* HAVE_ECC */
#ifndef NO_RSA
if (ssl->hsAltType == DYNAMIC_TYPE_RSA) {
ret = RsaSign(ssl, rsaSigBuf->buffer,
(word32)rsaSigBuf->length, sigOut,
&args->altSigLen, args->altSigAlgo,
ssl->options.hashAlgo, (RsaKey*)ssl->hsAltKey,
args->toSign = rsaSigBuf->buffer;
args->toSignSz = (word32)rsaSigBuf->length;
#if defined(HAVE_PK_CALLBACKS) && \
defined(TLS13_RSA_PSS_SIGN_CB_NO_PREHASH)
/* Pass full data to sign (args->altSigData), not hash of */
if (ssl->ctx->RsaPssSignCb) {
args->toSign = args->altSigData;
args->toSignSz = (word32)args->altSigDataSz;
}
#endif
ret = RsaSign(ssl, (const byte*)args->toSign,
args->toSignSz, sigOut, &args->altSigLen,
args->altSigAlgo, ssl->options.hashAlgo,
(RsaKey*)ssl->hsAltKey,
ssl->buffers.altKey);

if (ret == 0) {
Expand Down
33 changes: 29 additions & 4 deletions wolfssl/test.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3902,9 +3902,11 @@ static WC_INLINE int myRsaPssSign(WOLFSSL* ssl, const byte* in, word32 inSz,
{
enum wc_HashType hashType = WC_HASH_TYPE_NONE;
WC_RNG rng;
int ret;
int ret = 0;
word32 idx = 0;
RsaKey myKey;
byte* inBuf = (byte*)in;
word32 inBufSz = inSz;
byte* keyBuf = (byte*)key;
PkCbInfo* cbInfo = (PkCbInfo*)ctx;

Expand Down Expand Up @@ -3942,17 +3944,40 @@ static WC_INLINE int myRsaPssSign(WOLFSSL* ssl, const byte* in, word32 inSz,
if (ret != 0)
return ret;

ret = wc_InitRsaKey(&myKey, NULL);
#ifdef TLS13_RSA_PSS_SIGN_CB_NO_PREHASH
/* With this defined, RSA-PSS sign callback when used from TLS 1.3
* does not hash data before giving to this callback. User must
* compute hash themselves. */
if (wolfSSL_GetVersion(ssl) == WOLFSSL_TLSV1_3) {
inBufSz = wc_HashGetDigestSize(hashType);
inBuf = (byte*)XMALLOC(inBufSz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (inBuf == NULL) {
ret = MEMORY_E;
}
if (ret == 0) {
ret = wc_Hash(hashType, in, inSz, inBuf, inBufSz);
}
}
#endif

if (ret == 0) {
ret = wc_InitRsaKey(&myKey, NULL);
}
if (ret == 0) {
ret = wc_RsaPrivateKeyDecode(keyBuf, &idx, &myKey, keySz);
if (ret == 0) {
ret = wc_RsaPSS_Sign(in, inSz, out, *outSz, hashType, mgf, &myKey,
&rng);
ret = wc_RsaPSS_Sign(inBuf, inBufSz, out, *outSz, hashType, mgf,
&myKey, &rng);
}
if (ret > 0) { /* save and convert to 0 success */
*outSz = (word32) ret;
ret = 0;
}
#ifdef TLS13_RSA_PSS_SIGN_CB_NO_PREHASH
if ((inBuf != NULL) && (wolfSSL_GetVersion(ssl) == WOLFSSL_TLSV1_3)) {
XFREE(inBuf, NULL, DYNAMIC_TYPE_TMP_BUFFER);
}
#endif
wc_FreeRsaKey(&myKey);
}
wc_FreeRng(&rng);
Expand Down