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Add documentation to find_ecdsa_private_key()

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Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2022-03-18 15:27:38 +01:00
parent 05132ed490
commit 17a0655c8d
1 changed files with 17 additions and 0 deletions
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17
library/pk_wrap.c
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@ -823,12 +823,29 @@ static int pk_ecdsa_sig_asn1_from_psa( unsigned char *sig, size_t *sig_len,
return( 0 ); return( 0 );
} }
/* Locate an ECDSA privateKey in a RFC 5915, or SEC1 Appendix C.4 ASN.1 buffer
*
* [in/out] buf: ASN.1 buffer start as input - ECDSA privateKey start as output
* [in] end: ASN.1 buffer end
* [out] key_len: the ECDSA privateKey length in bytes
*/
static int find_ecdsa_private_key( unsigned char **buf, unsigned char *end, static int find_ecdsa_private_key( unsigned char **buf, unsigned char *end,
size_t *key_len ) size_t *key_len )
{ {
size_t len; size_t len;
int ret; int ret;
/*
* RFC 5915, or SEC1 Appendix C.4
*
* ECPrivateKey ::= SEQUENCE {
* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
* privateKey OCTET STRING,
* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
* publicKey [1] BIT STRING OPTIONAL
* }
*/
if( ( ret = mbedtls_asn1_get_tag( buf, end, &len, if( ( ret = mbedtls_asn1_get_tag( buf, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONSTRUCTED |
MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) MBEDTLS_ASN1_SEQUENCE ) ) != 0 )