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Fixes for peer review feedback. Improve the ECC key bit calculation. Improve the signature RS unsigned bin creation.

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This commit is contained in:
David Garske
2021-11-05 14:37:41 -07:00
parent d8faa22194
commit 3941eea626
2 changed files with 54 additions and 30 deletions
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10
wolfcrypt/src/ecc.c
View File

@@ -7094,12 +7094,16 @@ int wc_ecc_verify_hash_ex(mp_int *r, mp_int *s, const byte* hash,
#if defined(WOLFSSL_ATECC508A) || defined(WOLFSSL_ATECC608A) || \
defined(WOLFSSL_CRYPTOCELL) || defined(WOLFSSL_SILABS_SE_ACCEL) || \
defined(WOLFSSL_KCAPI_ECC) || defined(WOLFSSL_SE050)
/* Extract R and S */
err = mp_to_unsigned_bin(r, &sigRS[0]);
/* Extract R and S with front zero padding (if required) */
XMEMSET(sigRS, 0, keySz * 2);
err = mp_to_unsigned_bin(r, sigRS +
(keySz - mp_unsigned_bin_size(r)));
if (err != MP_OKAY) {
return err;
}
err = mp_to_unsigned_bin(s, &sigRS[keySz]);
err = mp_to_unsigned_bin(s, sigRS + keySz +
(keySz - mp_unsigned_bin_size(s)));
if (err != MP_OKAY) {
return err;
}

74
wolfcrypt/src/port/nxp/se050_port.c
View File

@@ -427,15 +427,22 @@ void se050_aes_free(Aes* aes)
#ifdef HAVE_ECC
static sss_cipher_type_t se050_map_curve(int curve_id)
static int se050_map_curve(int curve_id, int keySize,
int* keySizeBits, sss_cipher_type_t* pcurve_type)
{
int ret = 0;
sss_cipher_type_t curve_type;
*keySizeBits = keySize * 8; /* set default */
switch (curve_id) {
case ECC_SECP160K1:
case ECC_SECP160K1:
case ECC_SECP192K1:
case ECC_SECP224K1:
case ECC_SECP256K1:
#ifdef HAVE_ECC_KOBLITZ
curve_type = kSSS_CipherType_EC_NIST_K;
#else
ret = ECC_CURVE_OID_E;
#endif
break;
case ECC_BRAINPOOLP160R1:
case ECC_BRAINPOOLP192R1:
@@ -444,7 +451,15 @@ static sss_cipher_type_t se050_map_curve(int curve_id)
case ECC_BRAINPOOLP320R1:
case ECC_BRAINPOOLP384R1:
case ECC_BRAINPOOLP512R1:
#ifdef HAVE_ECC_BRAINPOOL
curve_type = kSSS_CipherType_EC_BRAINPOOL;
#else
ret = ECC_CURVE_OID_E;
#endif
break;
case ECC_SECP521R1:
curve_type = kSSS_CipherType_EC_NIST_P;
*keySizeBits = 521;
break;
case ECC_CURVE_DEF:
case ECC_SECP160R1:
@@ -452,12 +467,18 @@ static sss_cipher_type_t se050_map_curve(int curve_id)
case ECC_SECP224R1:
case ECC_SECP256R1:
case ECC_SECP384R1:
case ECC_SECP521R1:
default:
curve_type = kSSS_CipherType_EC_NIST_P;
break;
case ECC_PRIME239V1:
case ECC_PRIME192V2:
case ECC_PRIME192V3:
default:
ret = ECC_CURVE_OID_E;
break;
}
return curve_type;
if (pcurve_type)
*pcurve_type = curve_type;
return ret;
}
int se050_ecc_sign_hash_ex(const byte* in, word32 inLen, byte* out,
@@ -485,9 +506,10 @@ int se050_ecc_sign_hash_ex(const byte* in, word32 inLen, byte* out,
}
keySize = key->dp->size;
keySizeBits = keySize * 8;
if (keySizeBits > SSS_MAX_ECC_BITS)
keySizeBits = SSS_MAX_ECC_BITS;
ret = se050_map_curve(key->dp->id, keySize, &keySizeBits, NULL);
if (ret != 0) {
return ret;
}
/* truncate if digest is larger than key size */
if (inLen > (word32)keySize)
@@ -594,10 +616,10 @@ int se050_ecc_verify_hash_ex(const byte* hash, word32 hashLen, byte* sigRS,
}
keySize = key->dp->size;
keySizeBits = keySize * 8;
if (keySizeBits > SSS_MAX_ECC_BITS)
keySizeBits = SSS_MAX_ECC_BITS;
curveType = se050_map_curve(key->dp->id);
ret = se050_map_curve(key->dp->id, keySize, &keySizeBits, &curveType);
if (ret != 0) {
return ret;
}
/* truncate hash if larger than key size */
if (hashLen > (word32)keySize)
@@ -759,7 +781,6 @@ int se050_ecc_create_key(struct ecc_key* key, int curve_id, int keySize)
sss_key_store_t host_keystore;
uint8_t derBuf[SE050_ECC_DER_MAX];
size_t derSz = sizeof(derBuf);
size_t derSzBits = derSz * 8;
int keyId;
int keySizeBits;
sss_cipher_type_t curveType;
@@ -774,14 +795,9 @@ int se050_ecc_create_key(struct ecc_key* key, int curve_id, int keySize)
return WC_HW_E;
}
curveType = se050_map_curve(curve_id);
keySizeBits = keySize * 8;
if (keySizeBits > SSS_MAX_ECC_BITS)
keySizeBits = SSS_MAX_ECC_BITS;
if (keySize == 30) {
/* not supported curve key size */
return ECC_CURVE_OID_E;
ret = se050_map_curve(curve_id, keySize, &keySizeBits, &curveType);
if (ret != 0) {
return ret;
}
if (wolfSSL_CryptHwMutexLock() != 0) {
@@ -807,8 +823,10 @@ int se050_ecc_create_key(struct ecc_key* key, int curve_id, int keySize)
keySizeBits, NULL);
}
if (status == kStatus_SSS_Success) {
size_t derSzBits = derSz * 8;
status = sss_key_store_get_key(&host_keystore, &keyPair,
derBuf, &derSz, &derSzBits);
(void)derSzBits; /* not used */
}
if (status == kStatus_SSS_Success) {
word32 idx = 0;
@@ -853,7 +871,7 @@ int se050_ecc_shared_secret(ecc_key* private_key, ecc_key* public_key,
sss_derive_key_t ctx_derive_key;
int keyId;
int keySize;
size_t keySizeBits;
int keySizeBits;
sss_cipher_type_t curveType;
int keyCreated = 0;
int deriveKeyCreated = 0;
@@ -871,10 +889,10 @@ int se050_ecc_shared_secret(ecc_key* private_key, ecc_key* public_key,
}
keySize = private_key->dp->size;
keySizeBits = keySize * 8;
if (keySizeBits > SSS_MAX_ECC_BITS)
keySizeBits = SSS_MAX_ECC_BITS;
curveType = se050_map_curve(private_key->dp->id);
ret = se050_map_curve(private_key->dp->id, keySize, &keySizeBits, &curveType);
if (ret != 0) {
return ret;
}
if (wolfSSL_CryptHwMutexLock() != 0) {
return BAD_MUTEX_E;
@@ -947,10 +965,12 @@ int se050_ecc_shared_secret(ecc_key* private_key, ecc_key* public_key,
}
if (status == kStatus_SSS_Success) {
size_t outlenSz = (size_t)*outlen;
size_t outlenSzBits = outlenSz * 8;
/* derived key export */
status = sss_key_store_get_key(&host_keystore, &deriveKey, out,
&outlenSz, &keySizeBits);
&outlenSz, &outlenSzBits);
*outlen = (word32)outlenSz;
(void)outlenSzBits; /* not used */
}
sss_derive_key_context_free(&ctx_derive_key);