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rsa: use new openssl API to create signature

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Previous implementation of the rsa signature was using
the openssl API EVP_Sign*, but the new openssl API
EVP_DigestSign* is more flexible. So we move to this
new API.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Philippe Reynes 2018-11-14 13:50:59 +01:00 committed by Tom Rini
parent c8c0242f1c
commit 3b5d6979fc
1 changed files with 11 additions and 6 deletions
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17
lib/rsa/rsa-sign.c
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@ -393,7 +393,8 @@ static int rsa_sign_with_key(RSA *rsa, struct checksum_algo *checksum_algo,
{
EVP_PKEY *key;
EVP_MD_CTX *context;
int size, ret = 0;
int ret = 0;
size_t size;
uint8_t *sig;
int i;
@ -409,7 +410,7 @@ static int rsa_sign_with_key(RSA *rsa, struct checksum_algo *checksum_algo,
size = EVP_PKEY_size(key);
sig = malloc(size);
if (!sig) {
fprintf(stderr, "Out of memory for signature (%d bytes)\n",
fprintf(stderr, "Out of memory for signature (%zu bytes)\n",
size);
ret = -ENOMEM;
goto err_alloc;
@ -421,22 +422,26 @@ static int rsa_sign_with_key(RSA *rsa, struct checksum_algo *checksum_algo,
goto err_create;
}
EVP_MD_CTX_init(context);
if (!EVP_SignInit(context, checksum_algo->calculate_sign())) {
if (EVP_DigestSignInit(context, NULL,
checksum_algo->calculate_sign(),
NULL, key) <= 0) {
ret = rsa_err("Signer setup failed");
goto err_sign;
}
for (i = 0; i < region_count; i++) {
if (!EVP_SignUpdate(context, region[i].data, region[i].size)) {
if (!EVP_DigestSignUpdate(context, region[i].data,
region[i].size)) {
ret = rsa_err("Signing data failed");
goto err_sign;
}
}
if (!EVP_SignFinal(context, sig, sig_size, key)) {
if (!EVP_DigestSignFinal(context, sig, &size)) {
ret = rsa_err("Could not obtain signature");
goto err_sign;
}
#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
EVP_MD_CTX_cleanup(context);
@ -446,7 +451,7 @@ static int rsa_sign_with_key(RSA *rsa, struct checksum_algo *checksum_algo,
EVP_MD_CTX_destroy(context);
EVP_PKEY_free(key);
debug("Got signature: %d bytes, expected %d\n", *sig_size, size);
debug("Got signature: %d bytes, expected %zu\n", *sig_size, size);
*sigp = sig;
*sig_size = size;