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[test] Use mock random data for public key self-tests

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Make the public key self-tests fully deterministic by temporarily
overriding the function used to obtain random data for RSA encryption.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2026-05-06 21:43:44 +01:00
parent ae8defc279
commit 7fe8b7fde4
6 changed files with 110 additions and 11 deletions
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src/crypto/rsa.c
+8 -1
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@@ -70,6 +70,9 @@ struct rsa_context {
void *tmp;
};
/** Generate random data */
int ( * rsa_get_random ) ( void *data, size_t len ) = get_random_nz;
/**
* Identify RSA prefix
*
@@ -331,7 +334,7 @@ static int rsa_encrypt ( const struct asn1_cursor *key,
encoded = temp;
encoded[0] = 0x00;
encoded[1] = 0x02;
if ( ( rc = get_random_nz ( &encoded[2], random_nz_len ) ) != 0 ) {
if ( ( rc = rsa_get_random ( &encoded[2], random_nz_len ) ) != 0 ) {
DBGC ( &context, "RSA %p could not generate random data: %s\n",
&context, strerror ( rc ) );
goto err_random;
@@ -339,6 +342,8 @@ static int rsa_encrypt ( const struct asn1_cursor *key,
encoded[ 2 + random_nz_len ] = 0x00;
memcpy ( &encoded[ context.max_len - plaintext->len ],
plaintext->data, plaintext->len );
DBGC ( &context, "RSA %p encoded:\n", &context );
DBGC_HDA ( &context, 0, encoded, context.max_len );
/* Create space for ciphertext */
if ( ( rc = asn1_grow ( ciphertext, context.max_len ) ) != 0 )
@@ -404,6 +409,8 @@ static int rsa_decrypt ( const struct asn1_cursor *key,
temp = context.input0;
encoded = temp;
rsa_cipher ( &context, ciphertext->data, encoded );
DBGC ( &context, "RSA %p encoded:\n", &context );
DBGC_HDA ( &context, 0, encoded, context.max_len );
/* Parse the message */
end = ( encoded + context.max_len );