ssl/s3_cbc.c: md_state alignment portability fix.

RISCs are picky and alignment granted by compiler for md_state can be
insufficient for SHA512.
(cherry picked from commit 36260233e7e3396feed884d3f501283e0453c04f)

diff --git a/ssl/s3_cbc.c b/ssl/s3_cbc.c
index 694bf374d24a4c052054dcd117f5bf5a727c67a5..2c87b27eb1d54fea189c8e86a331ad87e3383dd2 100644 (file)
--- a/ssl/s3_cbc.c
+++ b/ssl/s3_cbc.c
@@ -415,7 +415,8 @@ void ssl3_cbc_digest_record(
        unsigned mac_secret_length,
        char is_sslv3)
        {
-       unsigned char md_state[sizeof(SHA512_CTX)];
+       union { double align;
+               unsigned char c[sizeof(SHA512_CTX)]; } md_state;
        void (*md_final_raw)(void *ctx, unsigned char *md_out);
        void (*md_transform)(void *ctx, const unsigned char *block);
        unsigned md_size, md_block_size = 64;
@@ -441,32 +442,32 @@ void ssl3_cbc_digest_record(
        switch (ctx->digest->type)
                {
                case NID_md5:
-                       MD5_Init((MD5_CTX*)md_state);
+                       MD5_Init((MD5_CTX*)md_state.c);
                        md_final_raw = tls1_md5_final_raw;
                        md_transform = (void(*)(void *ctx, const unsigned char *block)) MD5_Transform;
                        md_size = 16;
                        sslv3_pad_length = 48;
                        break;
                case NID_sha1:
-                       SHA1_Init((SHA_CTX*)md_state);
+                       SHA1_Init((SHA_CTX*)md_state.c);
                        md_final_raw = tls1_sha1_final_raw;
                        md_transform = (void(*)(void *ctx, const unsigned char *block)) SHA1_Transform;
                        md_size = 20;
                        break;
                case NID_sha224:
-                       SHA224_Init((SHA256_CTX*)md_state);
+                       SHA224_Init((SHA256_CTX*)md_state.c);
                        md_final_raw = tls1_sha256_final_raw;
                        md_transform = (void(*)(void *ctx, const unsigned char *block)) SHA256_Transform;
                        md_size = 224/8;
                        break;
                case NID_sha256:
-                       SHA256_Init((SHA256_CTX*)md_state);
+                       SHA256_Init((SHA256_CTX*)md_state.c);
                        md_final_raw = tls1_sha256_final_raw;
                        md_transform = (void(*)(void *ctx, const unsigned char *block)) SHA256_Transform;
                        md_size = 32;
                        break;
                case NID_sha384:
-                       SHA384_Init((SHA512_CTX*)md_state);
+                       SHA384_Init((SHA512_CTX*)md_state.c);
                        md_final_raw = tls1_sha512_final_raw;
                        md_transform = (void(*)(void *ctx, const unsigned char *block)) SHA512_Transform;
                        md_size = 384/8;
@@ -474,7 +475,7 @@ void ssl3_cbc_digest_record(
                        md_length_size = 16;
                        break;
                case NID_sha512:
-                       SHA512_Init((SHA512_CTX*)md_state);
+                       SHA512_Init((SHA512_CTX*)md_state.c);
                        md_final_raw = tls1_sha512_final_raw;
                        md_transform = (void(*)(void *ctx, const unsigned char *block)) SHA512_Transform;
                        md_size = 64;
@@ -579,7 +580,7 @@ void ssl3_cbc_digest_record(
                for (i = 0; i < md_block_size; i++)
                        hmac_pad[i] ^= 0x36;
 
-               md_transform(md_state, hmac_pad);
+               md_transform(md_state.c, hmac_pad);
                }
 
        memset(length_bytes,0,md_length_size-4);
@@ -597,21 +598,21 @@ void ssl3_cbc_digest_record(
                         * block that the header consumes: either 7 bytes
                         * (SHA1) or 11 bytes (MD5). */
                        unsigned overhang = header_length-md_block_size;
-                       md_transform(md_state, header);
+                       md_transform(md_state.c, header);
                        memcpy(first_block, header + md_block_size, overhang);
                        memcpy(first_block + overhang, data, md_block_size-overhang);
-                       md_transform(md_state, first_block);
+                       md_transform(md_state.c, first_block);
                        for (i = 1; i < k/md_block_size - 1; i++)
-                               md_transform(md_state, data + md_block_size*i - overhang);
+                               md_transform(md_state.c, data + md_block_size*i - overhang);
                        }
                else
                        {
                        /* k is a multiple of md_block_size. */
                        memcpy(first_block, header, 13);
                        memcpy(first_block+13, data, md_block_size-13);
-                       md_transform(md_state, first_block);
+                       md_transform(md_state.c, first_block);
                        for (i = 1; i < k/md_block_size; i++)
-                               md_transform(md_state, data + md_block_size*i - 13);
+                               md_transform(md_state.c, data + md_block_size*i - 13);
                        }
                }
 
@@ -661,8 +662,8 @@ void ssl3_cbc_digest_record(
                        block[j] = b;
                        }
 
-               md_transform(md_state, block);
-               md_final_raw(md_state, block);
+               md_transform(md_state.c, block);
+               md_final_raw(md_state.c, block);
                /* If this is index_b, copy the hash value to |mac_out|. */
                for (j = 0; j < md_size; j++)
                        mac_out[j] |= block[j]&is_block_b;