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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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4
library/pk_wrap.h
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@@ -53,7 +53,7 @@ struct mbedtls_pk_info_t
/** Make signature */
int (*sign_func)( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
@@ -67,7 +67,7 @@ struct mbedtls_pk_info_t
/** Make signature (restartable) */
int (*sign_rs_func)( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t *sig_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng, void *rs_ctx );
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */