Convert rand_bytes_ex and rand_priv_bytes_ex to public functions

These were initially added as internal functions only. However they will
also need to be used by libssl as well. Therefore it make sense to move
them into the public API.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10864)

crypto/bn/bn_rand.c

@@ -47,8 +47,8 @@ static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom,
     }
 
     /* make a random number and set the top and bottom bits */
-    b = flag == NORMAL ? rand_bytes_ex(libctx, buf, bytes)
-                       : rand_priv_bytes_ex(libctx, buf, bytes);
+    b = flag == NORMAL ? RAND_bytes_ex(libctx, buf, bytes)
+                       : RAND_priv_bytes_ex(libctx, buf, bytes);
     if (b <= 0)
         goto err;
 
@@ -60,7 +60,7 @@ static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom,
         unsigned char c;
 
         for (i = 0; i < bytes; i++) {
-            if (rand_bytes_ex(libctx, &c, 1) <= 0)
+            if (RAND_bytes_ex(libctx, &c, 1) <= 0)
                 goto err;
             if (c >= 128 && i > 0)
                 buf[i] = buf[i - 1];
@@ -280,7 +280,7 @@ int BN_generate_dsa_nonce(BIGNUM *out, const BIGNUM *range,
         goto err;
     }
     for (done = 0; done < num_k_bytes;) {
-        if (!rand_priv_bytes_ex(libctx, random_bytes, sizeof(random_bytes)))
+        if (!RAND_priv_bytes_ex(libctx, random_bytes, sizeof(random_bytes)))
             goto err;
 
         if (!EVP_DigestInit_ex(mdctx, md, NULL)

crypto/rand/rand_lib.c

@@ -851,7 +851,7 @@ void RAND_add(const void *buf, int num, double randomness)
  * the default method, then just call RAND_bytes().  Otherwise make
  * sure we're instantiated and use the private DRBG.
  */
-int rand_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
+int RAND_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
 {
     RAND_DRBG *drbg;
     const RAND_METHOD *meth = RAND_get_rand_method();
@@ -872,10 +872,10 @@ int rand_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
 
 int RAND_priv_bytes(unsigned char *buf, int num)
 {
-    return rand_priv_bytes_ex(NULL, buf, num);
+    return RAND_priv_bytes_ex(NULL, buf, num);
 }
 
-int rand_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
+int RAND_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
 {
     RAND_DRBG *drbg;
     const RAND_METHOD *meth = RAND_get_rand_method();
@@ -896,7 +896,7 @@ int rand_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
 
 int RAND_bytes(unsigned char *buf, int num)
 {
-    return rand_bytes_ex(NULL, buf, num);
+    return RAND_bytes_ex(NULL, buf, num);
 }
 
 #if !defined(OPENSSL_NO_DEPRECATED_1_1_0) && !defined(FIPS_MODE)

doc/internal/man3/rand_bytes_ex.pod

@@ -1,41 +0,0 @@
-=pod
-
-=head1 NAME
-
-rand_bytes_ex, rand_priv_bytes_ex
-- internal random number routines
-
-=head1 SYNOPSIS
-
- #include "crypto/rand.h"
-
- int rand_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
- int rand_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
-
-=head1 DESCRIPTION
-
-rand_bytes_ex() and rand_priv_bytes_ex() are the equivalent of RAND_bytes() and
-RAND_priv_bytes() in the public API except that they both take an additional
-I<ctx> parameter.
-The DRBG used for the operation is the public or private DRBG associated with
-the specified I<ctx>. The parameter can be NULL, in which case
-the default library ctx is used.
-If the default RAND_METHOD has been changed then for compatibility reasons the
-RAND_METHOD will be used in preference and the DRBG of the library context
-ignored.
-
-=head1 RETURN VALUES
-
-rand_bytes_ex() and rand_bytes_priv_ex() return 0 or less on error or 1 on
-success.
-
-=head1 COPYRIGHT
-
-Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
-
-Licensed under the Apache License 2.0 (the "License").  You may not use
-this file except in compliance with the License.  You can obtain a copy
-in the file LICENSE in the source distribution or at
-L<https://www.openssl.org/source/license.html>.
-
-=cut

doc/man3/RAND_bytes.pod

@@ -2,7 +2,8 @@
 
 =head1 NAME
 
-RAND_bytes, RAND_priv_bytes, RAND_pseudo_bytes - generate random data
+RAND_bytes, RAND_priv_bytes, RAND_bytes_ex, RAND_priv_bytes_ex,
+RAND_pseudo_bytes - generate random data
 
 =head1 SYNOPSIS
 
@@ -11,6 +12,9 @@ RAND_bytes, RAND_priv_bytes, RAND_pseudo_bytes - generate random data
  int RAND_bytes(unsigned char *buf, int num);
  int RAND_priv_bytes(unsigned char *buf, int num);
 
+ int RAND_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
+ int RAND_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
+
 Deprecated since OpenSSL 1.1.0, can be hidden entirely by defining
 B<OPENSSL_API_COMPAT> with a suitable version value, see
 L<openssl_user_macros(7)>:
@@ -29,6 +33,15 @@ instance so that a compromise of the "public" PRNG instance will not
 affect the secrecy of these private values, as described in L<RAND(7)>
 and L<RAND_DRBG(7)>.
 
+RAND_bytes_ex() and RAND_priv_bytes_ex() are the same as RAND_bytes() and
+RAND_priv_bytes() except that they both take an additional I<ctx> parameter.
+The DRBG used for the operation is the public or private DRBG associated with
+the specified I<ctx>. The parameter can be NULL, in which case
+the default library context is used (see L<OPENSSL_CTX(3)>.
+If the default RAND_METHOD has been changed then for compatibility reasons the
+RAND_METHOD will be used in preference and the DRBG of the library context
+ignored.
+
 =head1 NOTES
 
 Always check the error return value of RAND_bytes() and
@@ -64,6 +77,10 @@ RAND_pseudo_bytes() was deprecated in OpenSSL 1.1.0; use RAND_bytes() instead.
 
 The RAND_priv_bytes() function was added in OpenSSL 1.1.1.
 
+=item *
+
+The RAND_bytes_ex() and RAND_priv_bytes_ex() functions were added in OpenSSL 3.0
+
 =back
 
 =head1 COPYRIGHT

include/crypto/rand.h

@@ -186,10 +186,4 @@ void rand_pool_cleanup(void);
  */
 void rand_pool_keep_random_devices_open(int keep);
 
-/* Equivalent of RAND_priv_bytes() but additionally taking an OPENSSL_CTX */
-int rand_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
-
-/* Equivalent of RAND_bytes() but additionally taking an OPENSSL_CTX */
-int rand_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
-
 #endif

include/openssl/rand.h

@@ -47,6 +47,13 @@ RAND_METHOD *RAND_OpenSSL(void);
 # endif
 int RAND_bytes(unsigned char *buf, int num);
 int RAND_priv_bytes(unsigned char *buf, int num);
+
+/* Equivalent of RAND_priv_bytes() but additionally taking an OPENSSL_CTX */
+int RAND_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
+
+/* Equivalent of RAND_bytes() but additionally taking an OPENSSL_CTX */
+int RAND_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num);
+
 DEPRECATEDIN_1_1_0(int RAND_pseudo_bytes(unsigned char *buf, int num))
 
 void RAND_seed(const void *buf, int num);

providers/implementations/ciphers/cipher_aes_cbc_hmac_sha1_hw.c

@@ -23,7 +23,7 @@ int cipher_capable_aes_cbc_hmac_sha1(void)
 }
 #else
 
-# include "crypto/rand.h"
+# include <openssl/rand.h>
 # include "crypto/evp.h"
 # include "internal/constant_time.h"
 
@@ -135,7 +135,7 @@ static size_t tls1_multi_block_encrypt(void *vctx,
 #  endif
 
     /* ask for IVs in bulk */
-    if (rand_bytes_ex(ctx->base.libctx, (IVs = blocks[0].c), 16 * x4) <= 0)
+    if (RAND_bytes_ex(ctx->base.libctx, (IVs = blocks[0].c), 16 * x4) <= 0)
         return 0;
 
     mctx = (SHA1_MB_CTX *) (storage + 32 - ((size_t)storage % 32)); /* align */

providers/implementations/ciphers/cipher_aes_cbc_hmac_sha256_hw.c

@@ -23,7 +23,7 @@ int cipher_capable_aes_cbc_hmac_sha256(void)
 }
 #else
 
-# include "crypto/rand.h"
+# include <openssl/rand.h>
 # include "crypto/evp.h"
 # include "internal/constant_time.h"
 
@@ -139,7 +139,7 @@ static size_t tls1_multi_block_encrypt(void *vctx,
 #  endif
 
     /* ask for IVs in bulk */
-    if (rand_bytes_ex(ctx->base.libctx, (IVs = blocks[0].c), 16 * x4) <= 0)
+    if (RAND_bytes_ex(ctx->base.libctx, (IVs = blocks[0].c), 16 * x4) <= 0)
         return 0;
 
     mctx = (SHA256_MB_CTX *) (storage + 32 - ((size_t)storage % 32)); /* align */

providers/implementations/ciphers/cipher_des.c

@@ -9,7 +9,7 @@
 
 #include "prov/ciphercommon.h"
 #include "cipher_des.h"
-#include "crypto/rand.h"
+#include <openssl/rand.h>
 #include "prov/implementations.h"
 #include "prov/providercommonerr.h"
 
@@ -81,7 +81,7 @@ static int des_generatekey(PROV_CIPHER_CTX *ctx, void *ptr)
     DES_cblock *deskey = ptr;
     size_t kl = ctx->keylen;
 
-    if (kl == 0 || rand_priv_bytes_ex(ctx->libctx, ptr, kl) <= 0)
+    if (kl == 0 || RAND_priv_bytes_ex(ctx->libctx, ptr, kl) <= 0)
         return 0;
     DES_set_odd_parity(deskey);
     return 1;

providers/implementations/ciphers/cipher_tdes.c

@@ -9,7 +9,7 @@
 
 #include "prov/ciphercommon.h"
 #include "cipher_tdes.h"
-#include "crypto/rand.h"
+#include <openssl/rand.h>
 #include "prov/implementations.h"
 #include "prov/providercommonerr.h"
 
@@ -71,7 +71,7 @@ static int tdes_generatekey(PROV_CIPHER_CTX *ctx, void *ptr)
     DES_cblock *deskey = ptr;
     size_t kl = ctx->keylen;
 
-    if (kl == 0 || rand_priv_bytes_ex(ctx->libctx, ptr, kl) <= 0)
+    if (kl == 0 || RAND_priv_bytes_ex(ctx->libctx, ptr, kl) <= 0)
         return 0;
     DES_set_odd_parity(deskey);
     if (kl >= 16)

providers/implementations/ciphers/cipher_tdes_wrap.c

@@ -14,9 +14,9 @@
 #include "internal/deprecated.h"
 
 #include <openssl/sha.h>
+#include <openssl/rand.h>
 #include "cipher_tdes_default.h"
 #include "crypto/evp.h"
-#include "crypto/rand.h"
 #include "prov/implementations.h"
 #include "prov/providercommonerr.h"
 
@@ -98,7 +98,7 @@ static int des_ede3_wrap(PROV_CIPHER_CTX *ctx, unsigned char *out,
     memcpy(out + inl + ivlen, sha1tmp, icvlen);
     OPENSSL_cleanse(sha1tmp, SHA_DIGEST_LENGTH);
     /* Generate random IV */
-    if (rand_bytes_ex(ctx->libctx, ctx->iv, ivlen) <= 0)
+    if (RAND_bytes_ex(ctx->libctx, ctx->iv, ivlen) <= 0)
         return 0;
     memcpy(out, ctx->iv, ivlen);
     /* Encrypt everything after IV in place */

providers/implementations/ciphers/ciphercommon_gcm.c

@@ -12,7 +12,7 @@
 #include "prov/ciphercommon.h"
 #include "prov/ciphercommon_gcm.h"
 #include "prov/providercommonerr.h"
-#include "crypto/rand.h"
+#include <openssl/rand.h>
 #include "prov/provider_ctx.h"
 
 static int gcm_tls_init(PROV_GCM_CTX *dat, unsigned char *aad, size_t aad_len);
@@ -338,7 +338,7 @@ static int gcm_iv_generate(PROV_GCM_CTX *ctx, int offset)
         return 0;
 
     /* Use DRBG to generate random iv */
-    if (rand_bytes_ex(ctx->libctx, ctx->iv + offset, sz) <= 0)
+    if (RAND_bytes_ex(ctx->libctx, ctx->iv + offset, sz) <= 0)
         return 0;
     ctx->iv_state = IV_STATE_BUFFERED;
     ctx->iv_gen_rand = 1;
@@ -452,7 +452,7 @@ static int gcm_tls_iv_set_fixed(PROV_GCM_CTX *ctx, unsigned char *iv,
     if (len > 0)
         memcpy(ctx->iv, iv, len);
     if (ctx->enc
-        && rand_bytes_ex(ctx->libctx, ctx->iv + len, ctx->ivlen - len) <= 0)
+        && RAND_bytes_ex(ctx->libctx, ctx->iv + len, ctx->ivlen - len) <= 0)
             return 0;
     ctx->iv_gen = 1;
     ctx->iv_state = IV_STATE_BUFFERED;

util/libcrypto.num

@@ -4918,3 +4918,5 @@ OSSL_SELF_TEST_get_callback             ?	3_0_0	EXIST::FUNCTION:
 ASN1_TIME_dup                           ?	3_0_0	EXIST::FUNCTION:
 ASN1_UTCTIME_dup                        ?	3_0_0	EXIST::FUNCTION:
 ASN1_GENERALIZEDTIME_dup                ?	3_0_0	EXIST::FUNCTION:
+RAND_priv_bytes_ex                      ?	3_0_0	EXIST::FUNCTION:
+RAND_bytes_ex                           ?	3_0_0	EXIST::FUNCTION: