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Refactor dn_gets use library function to write tag

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Signed-off-by: Agathiyan Bragadeesh <agathiyan.bragadeesh2@arm.com>
This commit is contained in:
Agathiyan Bragadeesh 2023-08-10 15:50:57 +01:00
parent 2bf09a61a3
commit 5adffb2488
1 changed files with 19 additions and 18 deletions
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37
library/x509.c
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@ -826,8 +826,8 @@ static char nibble_to_hex_digit(int i)
int mbedtls_x509_dn_gets(char *buf, size_t size, const mbedtls_x509_name *dn)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t i, j, n, asn1_len_size, asn1_len_start;
unsigned char asn1_len_buf[5];
size_t i, j, n, asn1_len_size, asn1_tag_size, asn1_tag_len_buf_start;
unsigned char asn1_tag_len_buf[10];
unsigned char *asn1_len_p;
unsigned char c, merge = 0;
const mbedtls_x509_name *name;
@ -874,28 +874,29 @@ int mbedtls_x509_dn_gets(char *buf, size_t size, const mbedtls_x509_name *dn)
#if defined(MBEDTLS_ASN1_WRITE_C)
s[0] = '#';
c = name->val.tag;
lowbits = (c & 0x0F);
highbits = c >> 4;
s[1] = nibble_to_hex_digit(highbits);
s[2] = nibble_to_hex_digit(lowbits);
asn1_len_p = asn1_len_buf+5;
asn1_len_size = mbedtls_asn1_write_len(&asn1_len_p, asn1_len_buf, name->val.len);
asn1_len_start = 5 - asn1_len_size;
for (i = 0, j = 3; i < asn1_len_size + name->val.len; i++, j++) {
asn1_len_p = asn1_tag_len_buf + 10;
asn1_len_size = mbedtls_asn1_write_len(&asn1_len_p, asn1_tag_len_buf, name->val.len);
asn1_tag_size = mbedtls_asn1_write_tag(&asn1_len_p,asn1_tag_len_buf,name->val.tag);
asn1_tag_len_buf_start = 10 - asn1_len_size - asn1_tag_size;
for (i = 0, j = 1; i < asn1_len_size + asn1_tag_size; i++) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
if (i < asn1_len_size) {
c = asn1_len_buf[asn1_len_start+i];
} else {
c = name->val.p[i-asn1_len_size];
}
c = asn1_tag_len_buf[asn1_tag_len_buf_start+i];
lowbits = (c & 0x0F);
highbits = c >> 4;
s[j++] = nibble_to_hex_digit(highbits);
s[j] = nibble_to_hex_digit(lowbits);
s[j++] = nibble_to_hex_digit(lowbits);
}
for (i = 0; i < name->val.len; i++) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
c = name->val.p[i];
lowbits = (c & 0x0F);
highbits = c >> 4;
s[j++] = nibble_to_hex_digit(highbits);
s[j++] = nibble_to_hex_digit(lowbits);
}
#else
return MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;