From 6230d0d398b24cac80c0644672c381a50357274a Mon Sep 17 00:00:00 2001
From: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
Date: Mon, 27 Jun 2022 11:19:04 +0200
Subject: [PATCH] mbedtls_x509_sig_alg_gets(): remove md dependency

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
---
 library/x509.c | 51 +++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 46 insertions(+), 5 deletions(-)

diff --git a/library/x509.c b/library/x509.c
index 17d103038..453ed5990 100644
--- a/library/x509.c
+++ b/library/x509.c
@@ -131,6 +131,48 @@ int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
     return( 0 );
 }
 
+/*
+ * Convert md type to string
+ */
+static inline const char* md_type_to_string( mbedtls_md_type_t md_alg )
+{
+    switch( md_alg )
+    {
+#if defined(MBEDTLS_MD5_C)
+    case MBEDTLS_MD_MD5:
+        return( "MD5" );
+#endif
+#if defined(MBEDTLS_SHA1_C)
+    case MBEDTLS_MD_SHA1:
+        return( "SHA1" );
+#endif
+#if defined(MBEDTLS_SHA224_C)
+    case MBEDTLS_MD_SHA224:
+        return( "SHA224" );
+#endif
+#if defined(MBEDTLS_SHA256_C)
+    case MBEDTLS_MD_SHA256:
+        return( "SHA256" );
+#endif
+#if defined(MBEDTLS_SHA384_C)
+    case MBEDTLS_MD_SHA384:
+        return( "SHA384" );
+#endif
+#if defined(MBEDTLS_SHA512_C)
+    case MBEDTLS_MD_SHA512:
+        return( "SHA512" );
+#endif
+#if defined(MBEDTLS_RIPEMD160_C)
+    case MBEDTLS_MD_RIPEMD160:
+        return( "RIPEMD160" );
+#endif
+    case MBEDTLS_MD_NONE:
+        return( NULL );
+    default:
+        return( NULL );
+    }
+}
+
 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
 /*
  * HashAlgorithm ::= AlgorithmIdentifier
@@ -864,16 +906,15 @@ int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *s
     if( pk_alg == MBEDTLS_PK_RSASSA_PSS )
     {
         const mbedtls_pk_rsassa_pss_options *pss_opts;
-        const mbedtls_md_info_t *md_info, *mgf_md_info;
 
         pss_opts = (const mbedtls_pk_rsassa_pss_options *) sig_opts;
 
-        md_info = mbedtls_md_info_from_type( md_alg );
-        mgf_md_info = mbedtls_md_info_from_type( pss_opts->mgf1_hash_id );
+        const char *name = md_type_to_string ( md_alg );
+        const char *mgf_name = md_type_to_string ( pss_opts->mgf1_hash_id );
 
         ret = mbedtls_snprintf( p, n, " (%s, MGF1-%s, 0x%02X)",
-                              md_info ? mbedtls_md_get_name( md_info ) : "???",
-                              mgf_md_info ? mbedtls_md_get_name( mgf_md_info ) : "???",
+                              name ? name : "???",
+                              mgf_name ? mgf_name : "???",
                               (unsigned int) pss_opts->expected_salt_len );
         MBEDTLS_X509_SAFE_SNPRINTF;
     }