C++ (Cpp) mbedtls_asn1_get_alg_null示例

示例#1

文件： ecies_envelope.c 项目： cfogelklou/mbedtls

int mbedtls_ecies_read_hmac(unsigned char **p, const unsigned char *end,
        mbedtls_md_type_t *hmac_type, unsigned char **hmac, size_t *hmac_len)
{

    int result = 0;
    size_t len = 0;
    mbedtls_asn1_buf hmac_alg;

    if (hmac_type == NULL || hmac == NULL)
    {
        return MBEDTLS_ERR_ECIES_BAD_INPUT_DATA;
    }

    INVOKE_AND_CHECK(result,
        mbedtls_asn1_get_tag(p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)
    );
    INVOKE_AND_CHECK(result,
        mbedtls_asn1_get_alg_null(p, end, &hmac_alg)
    );
    INVOKE_AND_CHECK(result,
        mbedtls_oid_get_md_alg(&hmac_alg, hmac_type)
    );
    INVOKE_AND_CHECK(result,
        mbedtls_asn1_get_tag(p, end, hmac_len, MBEDTLS_ASN1_OCTET_STRING)
    );
    *hmac = *p;
    *p += *hmac_len;

    return result;
}

示例#2

文件： pkcs5.cpp 项目： kobi3028/Securing-an-Editor

static int pkcs5_parse_pbkdf2_params( const mbedtls_asn1_buf *params,
                                      mbedtls_asn1_buf *salt, int *iterations,
                                      int *keylen, mbedtls_md_type_t *md_type )
{
    int ret;
    mbedtls_asn1_buf prf_alg_oid;
    unsigned char *p = params->p;
    const unsigned char *end = params->p + params->len;

    if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
        return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
                MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
    /*
     *  PBKDF2-params ::= SEQUENCE {
     *    salt              OCTET STRING,
     *    iterationCount    INTEGER,
     *    keyLength         INTEGER OPTIONAL
     *    prf               AlgorithmIdentifier DEFAULT algid-hmacWithSHA1
     *  }
     *
     */
    if( ( ret = mbedtls_asn1_get_tag( &p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
        return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );

    salt->p = p;
    p += salt->len;

    if( ( ret = mbedtls_asn1_get_int( &p, end, iterations ) ) != 0 )
        return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );

    if( p == end )
        return( 0 );

    if( ( ret = mbedtls_asn1_get_int( &p, end, keylen ) ) != 0 )
    {
        if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
            return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );
    }

    if( p == end )
        return( 0 );

    if( ( ret = mbedtls_asn1_get_alg_null( &p, end, &prf_alg_oid ) ) != 0 )
        return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT + ret );

    if( MBEDTLS_OID_CMP( MBEDTLS_OID_HMAC_SHA1, &prf_alg_oid ) != 0 )
        return( MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE );

    *md_type = MBEDTLS_MD_SHA1;

    if( p != end )
        return( MBEDTLS_ERR_PKCS5_INVALID_FORMAT +
                MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );

    return( 0 );
}

示例#3

文件： x509.c 项目： Moteesh/reactos

/* Get an algorithm identifier without parameters (eg for signatures)
 *
 *  AlgorithmIdentifier  ::=  SEQUENCE  {
 *       algorithm               OBJECT IDENTIFIER,
 *       parameters              ANY DEFINED BY algorithm OPTIONAL  }
 */
int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end,
                       mbedtls_x509_buf *alg )
{
    int ret;

    if( ( ret = mbedtls_asn1_get_alg_null( p, end, alg ) ) != 0 )
        return( MBEDTLS_ERR_X509_INVALID_ALG + ret );

    return( 0 );
}