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Add x509_get_ecparams()

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Manuel Pégourié-Gonnard 2013-07-02 14:56:43 +02:00
parent f0b30d0542
commit f838eeda09
2 changed files with 33 additions and 0 deletions
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1
include/polarssl/x509.h
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@ -70,6 +70,7 @@
#define POLARSSL_ERR_X509_FILE_IO_ERROR -0x2B00 /**< Read/write of file failed. */
#define POLARSSL_ERR_X509_PASSWORD_REQUIRED -0x2B80 /**< Private key password can't be empty. */
#define POLARSSL_ERR_X509_PASSWORD_MISMATCH -0x2C00 /**< Given private key password does not allow for correct decryption. */
#define POLARSSL_ERR_X509_UNKNOWN_NAMED_CURVE -0x2C80 /**< Elliptic curve is unsupported (only NIST curves are supported). */
/* \} name */
/**

32
library/x509parse.c
View File

@ -201,6 +201,38 @@ static int x509_get_alg( unsigned char **p,
return( 0 );
}
/* Get an EC group id from an ECParameters buffer
*
* ECParameters ::= CHOICE {
* namedCurve OBJECT IDENTIFIER
* -- implicitCurve NULL
* -- specifiedCurve SpecifiedECDomain
* }
*/
static int x509_get_ecparams( unsigned char **p, const unsigned char *end,
ecp_group_id *grp_id )
{
int ret;
x509_buf curve;
curve.tag = **p;
if( ( ret = asn1_get_tag( p, end, &curve.len, ASN1_OID ) ) != 0 )
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
curve.p = *p;
*p += curve.len;
if( *p != end )
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
if( ( ret = oid_get_ec_grp( &curve, grp_id ) ) != 0 )
return( POLARSSL_ERR_X509_UNKNOWN_NAMED_CURVE );
return( 0 );
}
/*
* AttributeTypeAndValue ::= SEQUENCE {
* type AttributeType,