Port ASN1_buf_print() from OpenSSL 1.1.

This is needed to print byte array based keys, such as Ed25519 and X25519.

ok beck@ tb@

2 files changed, 34 insertions, 2 deletions

diff --git a/lib/libcrypto/asn1/asn1.h b/lib/libcrypto/asn1/asn1.h
index ff42e45676d..24ba6a66685 100644
--- a/lib/libcrypto/asn1/asn1.h
+++ b/lib/libcrypto/asn1/asn1.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: asn1.h,v 1.70 2022/09/11 17:22:52 tb Exp $ */
+/* $OpenBSD: asn1.h,v 1.71 2022/11/10 13:09:34 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -838,6 +838,9 @@ int ASN1_STRING_print(BIO *bp, const ASN1_STRING *v);
 int ASN1_STRING_print_ex(BIO *out, const ASN1_STRING *str, unsigned long flags);
 int ASN1_bn_print(BIO *bp, const char *number, const BIGNUM *num,
     unsigned char *buf, int off);
+#if defined(LIBRESSL_NEXT_API) || defined(LIBRESSL_INTERNAL)
+int ASN1_buf_print(BIO *bp, const unsigned char *buf, size_t buflen, int indent);
+#endif
 int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent);
 int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump);
 #endif
diff --git a/lib/libcrypto/asn1/t_pkey.c b/lib/libcrypto/asn1/t_pkey.c
index a3073812313..d1f77219ea2 100644
--- a/lib/libcrypto/asn1/t_pkey.c
+++ b/lib/libcrypto/asn1/t_pkey.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: t_pkey.c,v 1.17 2021/12/04 16:08:32 tb Exp $ */
+/* $OpenBSD: t_pkey.c,v 1.18 2022/11/10 13:09:34 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -114,3 +114,32 @@ ASN1_bn_print(BIO *bp, const char *number, const BIGNUM *num,
 	}
 	return (1);
 }
+
+#define ASN1_BUF_PRINT_WIDTH		15
+#define ASN1_BUF_PRINT_MAX_INDENT	64
+
+int
+ASN1_buf_print(BIO *bp, const unsigned char *buf, size_t buflen, int indent)
+{
+	size_t i;
+
+	for (i = 0; i < buflen; i++) {
+		if ((i % ASN1_BUF_PRINT_WIDTH) == 0) {
+			if (i > 0 && BIO_puts(bp, "\n") <= 0)
+				return 0;
+			if (!BIO_indent(bp, indent, ASN1_BUF_PRINT_MAX_INDENT))
+				return 0;
+		}
+		/*
+		 * Use colon separators for each octet for compatibility as
+		 * this function is used to print out key components.
+		 */
+		if (BIO_printf(bp, "%02x%s", buf[i],
+		    (i == buflen - 1) ? "" : ":") <= 0)
+			return 0;
+	}
+	if (BIO_write(bp, "\n", 1) <= 0)
+		return 0;
+
+	return 1;
+}