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openssl/crypto/rsa/rsa_oaep.c

Index: openssl/crypto/rsa/rsa_oaep.c
===================================================================
--- openssl/crypto/rsa/rsa_oaep.c	(revision 105093)
+++ openssl/crypto/rsa/rsa_oaep.c	(working copy)
@@ -28,7 +28,7 @@
 #include <openssl/rand.h>
 #include <openssl/sha.h>
 
-int MGF1(unsigned char *mask, long len,
+static int MGF1(unsigned char *mask, long len,
 	const unsigned char *seed, long seedlen);
 
 int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
@@ -76,11 +76,13 @@
 		return 0;
 		}
 
-	MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH);
+	if (MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH) < 0)
+		return 0;
 	for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++)
 		db[i] ^= dbmask[i];
 
-	MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH);
+	if (MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH) < 0)
+		return 0;
 	for (i = 0; i < SHA_DIGEST_LENGTH; i++)
 		seed[i] ^= seedmask[i];
 
@@ -133,11 +135,13 @@
 
 	maskeddb = padded_from + SHA_DIGEST_LENGTH;
 
-	MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen);
+	if (MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen))
+		return -1;
 	for (i = 0; i < SHA_DIGEST_LENGTH; i++)
 		seed[i] ^= padded_from[i];
   
-	MGF1(db, dblen, seed, SHA_DIGEST_LENGTH);
+	if (MGF1(db, dblen, seed, SHA_DIGEST_LENGTH))
+		return -1;
 	for (i = 0; i < dblen; i++)
 		db[i] ^= maskeddb[i];
 
@@ -185,35 +189,44 @@
 	EVP_MD_CTX c;
 	unsigned char md[EVP_MAX_MD_SIZE];
 	int mdlen;
+	int rv = -1;
 
 	EVP_MD_CTX_init(&c);
-	mdlen = M_EVP_MD_size(dgst);
+	mdlen = EVP_MD_size(dgst);
+	if (mdlen < 0)
+		goto err;
 	for (i = 0; outlen < len; i++)
 		{
 		cnt[0] = (unsigned char)((i >> 24) & 255);
 		cnt[1] = (unsigned char)((i >> 16) & 255);
 		cnt[2] = (unsigned char)((i >> 8)) & 255;
 		cnt[3] = (unsigned char)(i & 255);
-		EVP_DigestInit_ex(&c,dgst, NULL);
-		EVP_DigestUpdate(&c, seed, seedlen);
-		EVP_DigestUpdate(&c, cnt, 4);
+		if (!EVP_DigestInit_ex(&c,dgst, NULL)
+			|| !EVP_DigestUpdate(&c, seed, seedlen)
+			|| !EVP_DigestUpdate(&c, cnt, 4))
+			goto err;
 		if (outlen + mdlen <= len)
 			{
-			EVP_DigestFinal_ex(&c, mask + outlen, NULL);
+			if (!EVP_DigestFinal_ex(&c, mask + outlen, NULL))
+				goto err;
 			outlen += mdlen;
 			}
 		else
 			{
-			EVP_DigestFinal_ex(&c, md, NULL);
+			if (!EVP_DigestFinal_ex(&c, md, NULL))
+				goto err;
 			memcpy(mask + outlen, md, len - outlen);
 			outlen = len;
 			}
 		}
+	rv = 0;
+	err:
 	EVP_MD_CTX_cleanup(&c);
-	return 0;
+	return rv;
 	}
 
-int MGF1(unsigned char *mask, long len, const unsigned char *seed, long seedlen)
+static int MGF1(unsigned char *mask, long len, const unsigned char *seed,
+		 long seedlen)
 	{
 	return PKCS1_MGF1(mask, len, seed, seedlen, EVP_sha1());
 	}