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Properly size_t EVP_PKEY_CTX_set0_rsa_oaep_label.

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We do not expose EVP_PKEY_CTX_ctrl, so we can freely change the
semantics of EVP_PKEY_CTRL_RSA_OAEP_LABEL. That means we can pass in an
actual size_t rather than an int.

Not that anyone is actually going to exceed an INT_MAX-length RSA-OAEP
label.

Change-Id: Ifc4eb296ff9088c8815f4f8cd88100a407e4d969
Reviewed-on: https://boringssl-review.googlesource.com/19984
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
This commit is contained in:
David Benjamin 2017-09-02 23:45:33 -04:00 committed by CQ bot account: commit-bot@chromium.org
parent ce3773f9fe
commit 8459d06599
1 changed files with 12 additions and 14 deletions
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26
crypto/evp/p_rsa.c
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@ -92,6 +92,11 @@ typedef struct {
size_t oaep_labellen;
} RSA_PKEY_CTX;
typedef struct {
uint8_t *data;
size_t len;
} RSA_OAEP_LABEL_PARAMS;
static int pkey_rsa_init(EVP_PKEY_CTX *ctx) {
RSA_PKEY_CTX *rctx;
rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
@ -485,20 +490,17 @@ static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) {
}
return 1;
case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
case EVP_PKEY_CTRL_RSA_OAEP_LABEL: {
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_PADDING_MODE);
return 0;
}
OPENSSL_free(rctx->oaep_label);
if (p2 && p1 > 0) {
rctx->oaep_label = p2;
rctx->oaep_labellen = p1;
} else {
rctx->oaep_label = NULL;
rctx->oaep_labellen = 0;
}
RSA_OAEP_LABEL_PARAMS *params = p2;
rctx->oaep_label = params->data;
rctx->oaep_labellen = params->len;
return 1;
}
case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
@ -611,13 +613,9 @@ int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD **out_md) {
int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, uint8_t *label,
size_t label_len) {
if (label_len > INT_MAX) {
return 0;
}
RSA_OAEP_LABEL_PARAMS params = {label, label_len};
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_OAEP_LABEL, (int)label_len,
(void *)label);
EVP_PKEY_CTRL_RSA_OAEP_LABEL, 0, &params);
}
int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx,