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Add output size parameter to signature functions

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The functions mbedtls_pk_sign(), mbedtls_pk_sign_restartable(),
mbedtls_ecdsa_write_signature() and mbedtls_ecdsa_write_signature_restartable()
now take an extra parameter indicating the size of the output buffer for the
signature.

No change to RSA because for RSA, the output size is trivial to calculate.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-06-22 00:09:00 +02:00
parent 1fed4b8324
commit f00f152444
19 changed files with 131 additions and 81 deletions
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9
library/x509write_csr.c
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@@ -136,7 +136,7 @@ int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
static int x509write_csr_der_internal( mbedtls_x509write_csr *ctx,
unsigned char *buf,
size_t size,
unsigned char *sig,
unsigned char *sig, size_t sig_size,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
@@ -235,7 +235,8 @@ static int x509write_csr_der_internal( mbedtls_x509write_csr *ctx,
if( ret != 0 )
return( ret );
#endif
if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len,
if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0,
sig, sig_size, &sig_len,
f_rng, p_rng ) ) != 0 )
{
return( ret );
@@ -304,7 +305,9 @@ int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf,
return( MBEDTLS_ERR_X509_ALLOC_FAILED );
}
ret = x509write_csr_der_internal( ctx, buf, size, sig, f_rng, p_rng );
ret = x509write_csr_der_internal( ctx, buf, size,
sig, MBEDTLS_PK_SIGNATURE_MAX_SIZE,
f_rng, p_rng );
mbedtls_free( sig );