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Added function to write the ASN1 certificate description.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos 2022-06-10 16:29:28 +02:00
parent 824c327a2c
commit 3542062ecd
No known key found for this signature in database
GPG Key ID: C0095B7870A4CCD3
2 changed files with 45 additions and 0 deletions
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44
src/hsm/cvc.c
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@ -244,6 +244,50 @@ size_t asn1_cvc_aut(void *rsa_ecdsa, uint8_t key_type, uint8_t *buf, size_t buf_
return p-buf;
}
size_t asn1_build_cert_description(const uint8_t *label, size_t label_len, const uint8_t *puk, size_t puk_len, uint16_t fid, uint8_t *buf, size_t buf_len) {
size_t opt_len = 2;
size_t seq1_size = asn1_len_tag(0x30, asn1_len_tag(0xC, label_len)+asn1_len_tag(0x3, opt_len));
size_t seq2_size = asn1_len_tag(0x30, asn1_len_tag(0x4, 20)); /* SHA1 is 20 bytes length */
size_t seq3_size = asn1_len_tag(0xA1, asn1_len_tag(0x30, asn1_len_tag(0x30, asn1_len_tag(0x4, sizeof(uint16_t)))));
size_t tot_len = asn1_len_tag(0x30, seq1_size+seq2_size+seq3_size);
if (buf_len == 0 || buf == NULL)
return tot_len;
if (buf_len < tot_len)
return 0;
uint8_t *p = buf;
*p++ = 0x30;
p += format_tlv_len(seq1_size+seq2_size+seq3_size, p);
//Seq 1
*p++ = 0x30;
p += format_tlv_len(asn1_len_tag(0xC, label_len)+asn1_len_tag(0x3, opt_len), p);
*p++ = 0xC;
p += format_tlv_len(label_len, p);
memcpy(p, label, label_len); p += label_len;
*p++ = 0x3;
p += format_tlv_len(opt_len, p);
memcpy(p, "\x06\x40", 2); p += 2;
//Seq 2
*p++ = 0x30;
p += format_tlv_len(asn1_len_tag(0x4, 20), p);
*p++ = 0x4;
p += format_tlv_len(20, p);
mbedtls_md(mbedtls_md_info_from_type(MBEDTLS_MD_SHA1), puk, puk_len, p); p += 20;
//Seq 3
*p++ = 0xA1;
p += format_tlv_len(asn1_len_tag(0x30, asn1_len_tag(0x30, asn1_len_tag(0x4, sizeof(uint16_t)))), p);
*p++ = 0x30;
p += format_tlv_len(asn1_len_tag(0x30, asn1_len_tag(0x4, sizeof(uint16_t))), p);
*p++ = 0x30;
p += format_tlv_len(asn1_len_tag(0x4, sizeof(uint16_t)), p);
*p++ = 0x4;
p += format_tlv_len(sizeof(uint16_t), p);
*p++ = fid >> 8;
*p++ = fid & 0xff;
return p-buf;
}
const uint8_t *cvc_get_field(const uint8_t *data, size_t len, size_t *olen, uint16_t tag) {
uint8_t *rdata = NULL;
if (data == NULL || len == 0)

1
src/hsm/cvc.h
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@ -38,6 +38,7 @@ typedef struct PUK {
extern size_t asn1_cvc_cert(void *rsa_ecdsa, uint8_t key_type, uint8_t *buf, size_t buf_len);
extern size_t asn1_cvc_aut(void *rsa_ecdsa, uint8_t key_type, uint8_t *buf, size_t buf_len);
extern size_t asn1_build_cert_description(const uint8_t *label, size_t label_len, const uint8_t *puk, size_t puk_len, uint16_t fid, uint8_t *buf, size_t buf_len);
extern const uint8_t *cvc_get_field(const uint8_t *data, size_t len, size_t *olen, uint16_t tag);
extern const uint8_t *cvc_get_car(const uint8_t *data, size_t len, size_t *olen);
extern const uint8_t *cvc_get_chr(const uint8_t *data, size_t len, size_t *olen);