transparently handle X9.42 DH parameters

1 files changed, 52 insertions, 0 deletions

diff --git a/crypto/pem/pem_pkey.c b/crypto/pem/pem_pkey.c
index 8ecf24903b..e9e41dd4e8 100644
--- a/crypto/pem/pem_pkey.c
+++ b/crypto/pem/pem_pkey.c
@@ -68,6 +68,9 @@
 #ifndef OPENSSL_NO_ENGINE
 #include <openssl/engine.h>
 #endif
+#ifndef OPENSSL_NO_DH
+#include <openssl/dh.h>
+#endif
 #include "asn1_locl.h"
 
 int pem_check_suffix(const char *pem_str, const char *suffix);
@@ -240,3 +243,52 @@ int PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc,
 	}
 
 #endif
+
+#ifndef OPENSSL_NO_DH
+
+/* Transparently read in PKCS#3 or X9.42 DH parameters */
+
+DH *PEM_read_bio_DHparams(BIO *bp, DH **x, pem_password_cb *cb, void *u)
+	{
+	char *nm=NULL;
+	const unsigned char *p=NULL;
+	unsigned char *data=NULL;
+	long len;
+	DH *ret=NULL;
+
+	if (!PEM_bytes_read_bio(&data, &len, &nm, PEM_STRING_DHPARAMS,
+								bp, cb, u))
+		return NULL;
+	p = data;
+
+	if (!strcmp(nm, PEM_STRING_DHXPARAMS))
+		ret = d2i_DHxparams(x, &p, len);
+	else
+		ret = d2i_DHparams(x, &p, len);
+
+	if (ret == NULL)
+		PEMerr(PEM_F_PEM_READ_BIO_DHPARAMS,ERR_R_ASN1_LIB);
+	OPENSSL_free(nm);
+	OPENSSL_free(data);
+	return ret;
+	}
+
+#ifndef OPENSSL_NO_FP_API
+DH *PEM_read_DHparams(FILE *fp, DH **x, pem_password_cb *cb, void *u)
+	{
+        BIO *b;
+        DH *ret;
+
+        if ((b=BIO_new(BIO_s_file())) == NULL)
+		{
+		PEMerr(PEM_F_PEM_READ_DHPARAMS,ERR_R_BUF_LIB);
+                return(0);
+		}
+        BIO_set_fp(b,fp,BIO_NOCLOSE);
+        ret=PEM_read_bio_DHparams(b,x,cb,u);
+        BIO_free(b);
+        return(ret);
+	}
+#endif
+
+#endif