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pkcs7: do not store content type OID

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Since only one content type (signed data) is supported, storing the
content type just wastes memory.

Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>
This commit is contained in:
Demi Marie Obenour 2022-11-28 00:20:42 -05:00 committed by Dave Rodgman
parent 512818b1d2
commit aaf3c0028d
2 changed files with 28 additions and 28 deletions
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1
include/mbedtls/pkcs7.h
View File

@ -165,7 +165,6 @@ mbedtls_pkcs7_signed_data;
*/
typedef struct mbedtls_pkcs7 {
mbedtls_pkcs7_buf MBEDTLS_PRIVATE(raw);
mbedtls_pkcs7_buf MBEDTLS_PRIVATE(content_type_oid);
mbedtls_pkcs7_signed_data MBEDTLS_PRIVATE(signed_data);
}
mbedtls_pkcs7;

55
library/pkcs7.c
View File

@ -556,7 +556,6 @@ int mbedtls_pkcs7_parse_der(mbedtls_pkcs7 *pkcs7, const unsigned char *buf,
unsigned char *end, *end_content_info;
size_t len = 0;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
int isoidset = 0;
if (pkcs7 == NULL) {
return MBEDTLS_ERR_PKCS7_BAD_INPUT_DATA;
@ -572,34 +571,42 @@ int mbedtls_pkcs7_parse_der(mbedtls_pkcs7 *pkcs7, const unsigned char *buf,
pkcs7->raw.len = buflen;
end = p + buflen;
ret = pkcs7_get_content_info_type(&p, end, &end_content_info,
&pkcs7->content_type_oid);
ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED
| MBEDTLS_ASN1_SEQUENCE);
if (ret != 0) {
ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS7_INVALID_FORMAT, ret);
goto out;
}
if ((size_t) (end - p) != len) {
ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS7_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
goto out;
}
if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OID)) != 0) {
if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
goto out;
}
p = pkcs7->raw.p;
len = buflen;
goto try_data;
}
/* Ensure PKCS7 data uses the exact number of bytes specified in buflen */
if (end_content_info != end) {
ret = MBEDTLS_ERR_PKCS7_BAD_INPUT_DATA;
if (MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_PKCS7_SIGNED_DATA, p, len)) {
if (!MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_PKCS7_DATA, p, len)
|| !MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_PKCS7_ENCRYPTED_DATA, p, len)
|| !MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_PKCS7_ENVELOPED_DATA, p, len)
|| !MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_PKCS7_SIGNED_AND_ENVELOPED_DATA, p, len)
|| !MBEDTLS_OID_CMP_RAW(MBEDTLS_OID_PKCS7_DIGESTED_DATA, p, len)) {
ret = MBEDTLS_ERR_PKCS7_FEATURE_UNAVAILABLE;
} else {
ret = MBEDTLS_ERR_PKCS7_BAD_INPUT_DATA;
}
goto out;
}
if (!MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS7_DATA, &pkcs7->content_type_oid)
|| !MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS7_ENVELOPED_DATA, &pkcs7->content_type_oid)
|| !MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS7_SIGNED_AND_ENVELOPED_DATA, &pkcs7->content_type_oid)
|| !MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS7_DIGESTED_DATA, &pkcs7->content_type_oid)
|| !MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS7_ENCRYPTED_DATA, &pkcs7->content_type_oid)) {
ret = MBEDTLS_ERR_PKCS7_FEATURE_UNAVAILABLE;
goto out;
}
if (MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS7_SIGNED_DATA, &pkcs7->content_type_oid)) {
ret = MBEDTLS_ERR_PKCS7_BAD_INPUT_DATA;
goto out;
}
isoidset = 1;
p += len;
ret = pkcs7_get_next_content_len(&p, end, &len);
if (ret != 0) {
@ -618,12 +625,6 @@ try_data:
goto out;
}
if (!isoidset) {
pkcs7->content_type_oid.tag = MBEDTLS_ASN1_OID;
pkcs7->content_type_oid.len = MBEDTLS_OID_SIZE(MBEDTLS_OID_PKCS7_SIGNED_DATA);
pkcs7->content_type_oid.p = (unsigned char *) MBEDTLS_OID_PKCS7_SIGNED_DATA;
}
ret = MBEDTLS_PKCS7_SIGNED_DATA;
out: