Add EVP_DigestSign and EVP_DigesVerify

Add "single part" digest sign and verify functions. These sign and verify
a message in one function. This simplifies some operations and it will later
be used as the API for algorithms which do not support the update/final
mechanism (e.g. PureEdDSA).

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3409)

1 files changed, 16 insertions, 0 deletions

diff --git a/crypto/evp/m_sigver.c b/crypto/evp/m_sigver.c
index 3b74f72295..d53e1d6bd2 100644
--- a/crypto/evp/m_sigver.c
+++ b/crypto/evp/m_sigver.c
@@ -135,6 +135,14 @@ int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
     return 1;
 }
 
+int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
+                   const unsigned char *tbs, size_t tbslen)
+{
+    if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
+        return 0;
+    return EVP_DigestSignFinal(ctx, sigret, siglen);
+}
+
 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
                           size_t siglen)
 {
@@ -167,3 +175,11 @@ int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
         return r;
     return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
 }
+
+int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
+                     size_t siglen, const unsigned char *tbs, size_t tbslen)
+{
+    if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
+        return -1;
+    return EVP_DigestVerifyFinal(ctx, sigret, siglen);
+}