Update to OAEP support.

Add OAEP ctrls to retrieve MD and label. Return errors if
an attempt is made to set or retrieve OAEP parameters when
padding mode is not OAEP.

crypto/rsa/rsa.h

@@ -262,10 +262,18 @@ struct rsa_st
 			EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT, \
 				EVP_PKEY_CTRL_GET_RSA_MGF1_MD, 0, (void *)pmd)
 
+#define	 EVP_PKEY_CTX_get_rsa_oaep_md(ctx, pmd)	\
+		EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,  \
+				EVP_PKEY_CTRL_GET_RSA_OAEP_MD, 0, (void *)pmd)
+
 #define	 EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, l, llen)	\
 		EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,  \
 				EVP_PKEY_CTRL_RSA_OAEP_LABEL, llen, (void *)l)
 
+#define	 EVP_PKEY_CTX_get0_rsa_oaep_label(ctx, l)	\
+		EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,  \
+				EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL, 0, (void *)l)
+
 #define EVP_PKEY_CTRL_RSA_PADDING	(EVP_PKEY_ALG_CTRL + 1)
 #define EVP_PKEY_CTRL_RSA_PSS_SALTLEN	(EVP_PKEY_ALG_CTRL + 2)
 
@@ -280,6 +288,9 @@ struct rsa_st
 #define EVP_PKEY_CTRL_RSA_OAEP_MD	(EVP_PKEY_ALG_CTRL + 9)
 #define EVP_PKEY_CTRL_RSA_OAEP_LABEL	(EVP_PKEY_ALG_CTRL + 10)
 
+#define EVP_PKEY_CTRL_GET_RSA_OAEP_MD	(EVP_PKEY_ALG_CTRL + 11)
+#define EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL (EVP_PKEY_ALG_CTRL + 12)
+
 #define RSA_PKCS1_PADDING	1
 #define RSA_SSLV23_PADDING	2
 #define RSA_NO_PADDING		3

crypto/rsa/rsa_pmeth.c

@@ -520,12 +520,16 @@ static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 		return 1;
 
 		case EVP_PKEY_CTRL_RSA_OAEP_MD:
+		case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
 		if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING)
 			{
 			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
-			return 0;
+			return -2;
 			}
-		rctx->md = p2;
+		if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
+			*(const EVP_MD **)p2 = rctx->md;
+		else
+			rctx->md = p2;
 		return 1;
 
 		case EVP_PKEY_CTRL_MD:
@@ -558,11 +562,34 @@ static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 		return 1;
 
 		case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
-		OPENSSL_free(rctx->oaep_label);
-		rctx->oaep_label = p2;
-		rctx->oaep_labellen = p1;
+		if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING)
+			{
+			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
+			return -2;
+			}
+		if (rctx->oaep_label)
+			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;
+			}
 		return 1;
 
+		case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
+		if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING)
+			{
+			RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
+			return -2;
+			}
+		*(unsigned char **)p2 = rctx->oaep_label;
+		return rctx->oaep_labellen;
+
 		case EVP_PKEY_CTRL_DIGESTINIT:
 		case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
 		case EVP_PKEY_CTRL_PKCS7_DECRYPT: