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Merge remote-tracking branch 'restricted/pr/581' into mbedtls-2.7-restricted

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* restricted/pr/581:
  Remove unnecessary empty line
  Add a test for signing content with a long ECDSA key
  Add documentation notes about the required size of the signature buffers
  Add missing MBEDTLS_ECP_C dependencies in check_config.h
  Change size of preallocated buffer for pk_sign() calls
This commit is contained in:
Jaeden Amero 2019-06-24 11:40:49 +01:00
parent 0b2035794f dff85e7e8a
commit 1e61b0fb3f
9 changed files with 68 additions and 5 deletions
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5
include/mbedtls/check_config.h
View file

@ -107,7 +107,7 @@
#error "MBEDTLS_ECDSA_DETERMINISTIC defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_C) && ( !defined(MBEDTLS_BIGNUM_C) || ( \
#if defined(MBEDTLS_ECP_C) && ( !defined(MBEDTLS_BIGNUM_C) || ( \
!defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) && \
!defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) && \
!defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) && \
@ -118,7 +118,8 @@
!defined(MBEDTLS_ECP_DP_BP512R1_ENABLED) && \
!defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) && \
!defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) && \
!defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED) ) )
!defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED) && \
!defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) ) )
#error "MBEDTLS_ECP_C defined, but not all prerequisites"
#endif

4
include/mbedtls/pk.h
View file

@ -343,6 +343,10 @@ int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
*
* \note For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
* For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
*
* \note In order to ensure enough space for the signature, the
* \p sig buffer size must be of at least
* `max(MBEDTLS_ECDSA_MAX_LEN, MBEDTLS_MPI_MAX_SIZE)` bytes.
*/
int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,

3
include/mbedtls/rsa.h
View file

@ -819,6 +819,7 @@ int mbedtls_rsa_rsaes_oaep_decrypt( mbedtls_rsa_context *ctx,
*
* \note The \p sig buffer must be as large as the size
* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
* A buffer length of #MBEDTLS_MPI_MAX_SIZE is always safe.
*
* \note For PKCS#1 v2.1 encoding, see comments on
* mbedtls_rsa_rsassa_pss_sign() for details on
@ -862,6 +863,7 @@ int mbedtls_rsa_pkcs1_sign( mbedtls_rsa_context *ctx,
*
* \note The \p sig buffer must be as large as the size
* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
* A buffer length of #MBEDTLS_MPI_MAX_SIZE is always safe.
*/
int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
@ -902,6 +904,7 @@ int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
*
* \note The \p sig buffer must be as large as the size
* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
* A buffer length of #MBEDTLS_MPI_MAX_SIZE is always safe.
*
* \note The \p hash_id in the RSA context is the one used for the
* encoding. \p md_alg in the function call is the type of hash

12
library/x509write_crt.c
View file

@ -49,6 +49,16 @@ static void mbedtls_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
/*
* For the currently used signature algorithms the buffer to store any signature
* must be at least of size MAX(MBEDTLS_ECDSA_MAX_LEN, MBEDTLS_MPI_MAX_SIZE)
*/
#if MBEDTLS_ECDSA_MAX_LEN > MBEDTLS_MPI_MAX_SIZE
#define SIGNATURE_MAX_SIZE MBEDTLS_ECDSA_MAX_LEN
#else
#define SIGNATURE_MAX_SIZE MBEDTLS_MPI_MAX_SIZE
#endif
void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx )
{
memset( ctx, 0, sizeof( mbedtls_x509write_cert ) );
@ -338,7 +348,7 @@ int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, unsigned char *buf,
size_t sig_oid_len = 0;
unsigned char *c, *c2;
unsigned char hash[64];
unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
unsigned char sig[SIGNATURE_MAX_SIZE];
unsigned char tmp_buf[2048];
size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len;
size_t len = 0;

12
library/x509write_csr.c
View file

@ -48,6 +48,16 @@ static void mbedtls_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
/*
* For the currently used signature algorithms the buffer to store any signature
* must be at least of size MAX(MBEDTLS_ECDSA_MAX_LEN, MBEDTLS_MPI_MAX_SIZE)
*/
#if MBEDTLS_ECDSA_MAX_LEN > MBEDTLS_MPI_MAX_SIZE
#define SIGNATURE_MAX_SIZE MBEDTLS_ECDSA_MAX_LEN
#else
#define SIGNATURE_MAX_SIZE MBEDTLS_MPI_MAX_SIZE
#endif
void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx )
{
memset( ctx, 0, sizeof( mbedtls_x509write_csr ) );
@ -163,7 +173,7 @@ int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, s
size_t sig_oid_len = 0;
unsigned char *c, *c2;
unsigned char hash[64];
unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
unsigned char sig[SIGNATURE_MAX_SIZE];
unsigned char tmp_buf[2048];
size_t pub_len = 0, sig_and_oid_len = 0, sig_len;
size_t len = 0;

12
programs/pkey/pk_sign.c
View file

@ -59,6 +59,16 @@ int main( void )
#include <stdio.h>
#include <string.h>
/*
* For the currently used signature algorithms the buffer to store any signature
* must be at least of size MAX(MBEDTLS_ECDSA_MAX_LEN, MBEDTLS_MPI_MAX_SIZE)
*/
#if MBEDTLS_ECDSA_MAX_LEN > MBEDTLS_MPI_MAX_SIZE
#define SIGNATURE_MAX_SIZE MBEDTLS_ECDSA_MAX_LEN
#else
#define SIGNATURE_MAX_SIZE MBEDTLS_MPI_MAX_SIZE
#endif
int main( int argc, char *argv[] )
{
FILE *f;
@ -68,7 +78,7 @@ int main( int argc, char *argv[] )
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
unsigned char hash[32];
unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
unsigned char buf[SIGNATURE_MAX_SIZE];
char filename[512];
const char *pers = "mbedtls_pk_sign";
size_t olen = 0;

8
tests/data_files/Makefile
View file

@ -733,6 +733,14 @@ server1.req.cert_type_empty: server1.key
$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA1 force_ns_cert_type=1
all_final += server1.req.cert_type_empty
###
### A generic SECP521R1 private key
###
secp521r1_prv.der:
$(OPENSSL) ecparam -genkey -name secp521r1 -noout -out secp521r1_prv.der
all_final += secp521r1_prv.der
################################################################
### Generate certificates for CRT write check tests
################################################################

BIN
tests/data_files/secp521r1_prv.der Normal file
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17
tests/scripts/all.sh
View file

@ -591,6 +591,23 @@ component_check_doxygen_warnings () {
#### Build and test many configurations and targets
################################################################
component_test_large_ecdsa_key_signature () {
SMALL_MPI_MAX_SIZE=136 # Small enough to interfere with the EC signatures
msg "build: cmake + MBEDTLS_MPI_MAX_SIZE=${SMALL_MPI_MAX_SIZE}, gcc, ASan" # ~ 1 min 50s
scripts/config.pl set MBEDTLS_MPI_MAX_SIZE $SMALL_MPI_MAX_SIZE
CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
make
INEVITABLY_PRESENT_FILE=Makefile
SIGNATURE_FILE="${INEVITABLY_PRESENT_FILE}.sig" # Warning, this is rm -f'ed below
msg "test: pk_sign secp521r1_prv.der for MBEDTLS_MPI_MAX_SIZE=${SMALL_MPI_MAX_SIZE} (ASan build)" # ~ 5s
if_build_succeeded programs/pkey/pk_sign tests/data_files/secp521r1_prv.der $INEVITABLY_PRESENT_FILE
rm -f $SIGNATURE_FILE
}
component_test_default_out_of_box () {
msg "build: make, default config (out-of-box)" # ~1min
make