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asn: cleanup around edPubKeyASN. #8009

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merged 2 commits into from
Sep 25, 2024
Merged

asn: cleanup around edPubKeyASN. #8009

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0f646b6
asn: cleanup around edPubKeyASN.
philljj Sep 24, 2024
c6124d5
asn: tiny peer review cleanup.
philljj Sep 24, 2024
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57 changes: 31 additions & 26 deletions wolfcrypt/src/asn.c
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,7 @@ ASN Options:
* WOLFSSL_NO_ASN_STRICT: Disable strict RFC compliance checks to
restore 3.13.0 behavior.
* WOLFSSL_ASN_ALLOW_0_SERIAL: Even if WOLFSSL_NO_ASN_STRICT is not defined,
allow a length=1, but zero value serial numnber.
allow a length=1, but zero value serial number.
* WOLFSSL_NO_OCSP_OPTIONAL_CERTS: Skip optional OCSP certs (responder issuer
must still be trusted)
* WOLFSSL_NO_TRUSTED_CERTS_VERIFY: Workaround for situation where entire cert
Expand Down Expand Up @@ -12015,34 +12015,38 @@ int wc_EccPublicKeyDerSize(ecc_key* key, int with_AlgCurve)

#ifdef WOLFSSL_ASN_TEMPLATE
#if defined(WC_ENABLE_ASYM_KEY_EXPORT) || defined(WC_ENABLE_ASYM_KEY_IMPORT)
/* ASN.1 template for Ed25519 and Ed448 public key (SubkectPublicKeyInfo).
/* ASN.1 template for the SubjectPublicKeyInfo of a general asymmetric key.
* Used with Ed448/Ed25519, Curve448/Curve25519, sphincs, falcon, dilithium,
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SPHINCS+

* etc.
*
* X.509: RFC 5280, 4.1 - SubjectPublicKeyInfo
* RFC 8410, 4 - Subject Public Key Fields
*/
static const ASNItem edPubKeyASN[] = {
static const ASNItem publicKeyASN[] = {
/* SubjectPublicKeyInfo */
/* SEQ */ { 0, ASN_SEQUENCE, 1, 1, 0 },
/* AlgorithmIdentifier */
/* ALGOID_SEQ */ { 1, ASN_SEQUENCE, 1, 1, 0 },
/* Ed25519/Ed448 OID */
/* Ed25519/Ed448 OID, etc. */
/* ALGOID_OID */ { 2, ASN_OBJECT_ID, 0, 0, 1 },
/* Public key stream */
/* PUBKEY */ { 1, ASN_BIT_STRING, 0, 0, 0 },
};
enum {
EDPUBKEYASN_IDX_SEQ = 0,
EDPUBKEYASN_IDX_ALGOID_SEQ,
EDPUBKEYASN_IDX_ALGOID_OID,
EDPUBKEYASN_IDX_PUBKEY
PUBKEYASN_IDX_SEQ = 0,
PUBKEYASN_IDX_ALGOID_SEQ,
PUBKEYASN_IDX_ALGOID_OID,
PUBKEYASN_IDX_PUBKEY
};

/* Number of items in ASN.1 template for Ed25519 and Ed448 public key. */
#define edPubKeyASN_Length (sizeof(edPubKeyASN) / sizeof(ASNItem))
/* Number of items in ASN.1 template for public key SubjectPublicKeyInfo. */
#define publicKeyASN_Length (sizeof(publicKeyASN) / sizeof(ASNItem))
#endif /* WC_ENABLE_ASYM_KEY_EXPORT || WC_ENABLE_ASYM_KEY_IMPORT */
#endif /* WOLFSSL_ASN_TEMPLATE */

#ifdef WC_ENABLE_ASYM_KEY_EXPORT

/* Build ASN.1 formatted public key based on RFC 8410
/* Build ASN.1 formatted public key based on RFC 5280 and RFC 8410
*
* Pass NULL for output to get the size of the encoding.
*
Expand All @@ -12066,7 +12070,7 @@ int SetAsymKeyDerPublic(const byte* pubKey, word32 pubKeyLen,
word32 sz;
#else
int sz = 0;
DECL_ASNSETDATA(dataASN, edPubKeyASN_Length);
DECL_ASNSETDATA(dataASN, publicKeyASN_Length);
#endif

/* validate parameters */
Expand Down Expand Up @@ -12118,25 +12122,26 @@ int SetAsymKeyDerPublic(const byte* pubKey, word32 pubKeyLen,
}
#else
if (withHeader) {
CALLOC_ASNSETDATA(dataASN, edPubKeyASN_Length, ret, NULL);
CALLOC_ASNSETDATA(dataASN, publicKeyASN_Length, ret, NULL);

if (ret == 0) {
/* Set the OID. */
SetASN_OID(&dataASN[EDPUBKEYASN_IDX_ALGOID_OID], (word32)keyType,
SetASN_OID(&dataASN[PUBKEYASN_IDX_ALGOID_OID], (word32)keyType,
oidKeyType);
/* Leave space for public point. */
SetASN_Buffer(&dataASN[EDPUBKEYASN_IDX_PUBKEY], NULL, pubKeyLen);
SetASN_Buffer(&dataASN[PUBKEYASN_IDX_PUBKEY], NULL, pubKeyLen);
/* Calculate size of public key encoding. */
ret = SizeASN_Items(edPubKeyASN, dataASN, edPubKeyASN_Length, &sz);
ret = SizeASN_Items(publicKeyASN, dataASN, publicKeyASN_Length,
&sz);
}
if ((ret == 0) && (output != NULL) && (sz > (int)outLen)) {
ret = BUFFER_E;
}
if ((ret == 0) && (output != NULL)) {
/* Encode public key. */
SetASN_Items(edPubKeyASN, dataASN, edPubKeyASN_Length, output);
SetASN_Items(publicKeyASN, dataASN, publicKeyASN_Length, output);
/* Set location to encode public point. */
output = (byte*)dataASN[EDPUBKEYASN_IDX_PUBKEY].data.buffer.data;
output = (byte*)dataASN[PUBKEYASN_IDX_PUBKEY].data.buffer.data;
}

FREE_ASNSETDATA(dataASN, NULL);
Expand Down Expand Up @@ -35234,7 +35239,7 @@ int DecodeAsymKeyPublic_Assign(const byte* input, word32* inOutIdx, word32 inSz,
word32 oid;
#else
word32 len;
DECL_ASNGETDATA(dataASN, edPubKeyASN_Length);
DECL_ASNGETDATA(dataASN, publicKeyASN_Length);
#endif

if (input == NULL || inSz == 0 || inOutIdx == NULL ||
Expand Down Expand Up @@ -35269,17 +35274,17 @@ int DecodeAsymKeyPublic_Assign(const byte* input, word32* inOutIdx, word32 inSz,
#else
len = inSz - *inOutIdx;

CALLOC_ASNGETDATA(dataASN, edPubKeyASN_Length, ret, NULL);
CALLOC_ASNGETDATA(dataASN, publicKeyASN_Length, ret, NULL);

if (ret == 0) {
/* Require OID. */
word32 oidSz;
const byte* oid = OidFromId((word32)keyType, oidKeyType, &oidSz);

GetASN_ExpBuffer(&dataASN[EDPUBKEYASN_IDX_ALGOID_OID], oid, oidSz);
GetASN_ExpBuffer(&dataASN[PUBKEYASN_IDX_ALGOID_OID], oid, oidSz);
/* Decode Ed25519 private key. */
ret = GetASN_Items(edPubKeyASN, dataASN, edPubKeyASN_Length, 1, input,
inOutIdx, inSz);
ret = GetASN_Items(publicKeyASN, dataASN, publicKeyASN_Length, 1,
input, inOutIdx, inSz);
if (ret != 0)
ret = ASN_PARSE_E;
/* check that input buffer is exhausted */
Expand All @@ -35288,12 +35293,12 @@ int DecodeAsymKeyPublic_Assign(const byte* input, word32* inOutIdx, word32 inSz,
}
/* Check that the all the buffer was used. */
if ((ret == 0) &&
(GetASNItem_Length(dataASN[EDPUBKEYASN_IDX_SEQ], input) != len)) {
(GetASNItem_Length(dataASN[PUBKEYASN_IDX_SEQ], input) != len)) {
ret = ASN_PARSE_E;
}
if (ret == 0) {
*pubKeyLen = dataASN[EDPUBKEYASN_IDX_PUBKEY].data.ref.length;
*pubKey = dataASN[EDPUBKEYASN_IDX_PUBKEY].data.ref.data;
*pubKeyLen = dataASN[PUBKEYASN_IDX_PUBKEY].data.ref.length;
*pubKey = dataASN[PUBKEYASN_IDX_PUBKEY].data.ref.data;
}

FREE_ASNGETDATA(dataASN, NULL);
Expand Down