fix formatting so that the file can be view with any tab-width

crypto/rsa/rsa_oaep.c

@@ -34,158 +34,158 @@ int MGF1(unsigned char *mask, long len,
 int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
 	const unsigned char *from, int flen,
 	const unsigned char *param, int plen)
-    {
-    int i, emlen = tlen - 1;
-    unsigned char *db, *seed;
-    unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH];
-
-    if (flen > emlen - 2 * SHA_DIGEST_LENGTH - 1)
 	{
-	RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP,
-	       RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
-	return (0);
-	}
+	int i, emlen = tlen - 1;
+	unsigned char *db, *seed;
+	unsigned char *dbmask, seedmask[SHA_DIGEST_LENGTH];
 
-    if (emlen < 2 * SHA_DIGEST_LENGTH + 1)
-	{
-	RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL);
-	return (0);
-	}
-    
-    dbmask = OPENSSL_malloc(emlen - SHA_DIGEST_LENGTH);
-    if (dbmask == NULL)
-	{
-	RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
-	return (0);
-	}
+	if (flen > emlen - 2 * SHA_DIGEST_LENGTH - 1)
+		{
+		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP,
+		   RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
+		return (0);
+		}
 
-    to[0] = 0;
-    seed = to + 1;
-    db = to + SHA_DIGEST_LENGTH + 1;
-
-    EVP_Digest((void *)param, plen, db, NULL, EVP_sha1());
-    memset(db + SHA_DIGEST_LENGTH, 0,
-	   emlen - flen - 2 * SHA_DIGEST_LENGTH - 1);
-    db[emlen - flen - SHA_DIGEST_LENGTH - 1] = 0x01;
-    memcpy(db + emlen - flen - SHA_DIGEST_LENGTH, from, (unsigned int) flen);
-    if (RAND_bytes(seed, SHA_DIGEST_LENGTH) <= 0)
-    	return (0);
+	if (emlen < 2 * SHA_DIGEST_LENGTH + 1)
+		{
+		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, RSA_R_KEY_SIZE_TOO_SMALL);
+		return (0);
+		}
+	
+	dbmask = OPENSSL_malloc(emlen - SHA_DIGEST_LENGTH);
+	if (dbmask == NULL)
+		{
+		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
+		return (0);
+		}
+
+	to[0] = 0;
+	seed = to + 1;
+	db = to + SHA_DIGEST_LENGTH + 1;
+
+	EVP_Digest((void *)param, plen, db, NULL, EVP_sha1());
+	memset(db + SHA_DIGEST_LENGTH, 0,
+		emlen - flen - 2 * SHA_DIGEST_LENGTH - 1);
+	db[emlen - flen - SHA_DIGEST_LENGTH - 1] = 0x01;
+	memcpy(db + emlen - flen - SHA_DIGEST_LENGTH, from, (unsigned int) flen);
+	if (RAND_bytes(seed, SHA_DIGEST_LENGTH) <= 0)
+		return (0);
 #ifdef PKCS_TESTVECT
-    memcpy(seed,
+	memcpy(seed,
 	   "\xaa\xfd\x12\xf6\x59\xca\xe6\x34\x89\xb4\x79\xe5\x07\x6d\xde\xc2\xf0\x6c\xb5\x8f",
 	   20);
 #endif
 
-    MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH);
-    for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++)
-	db[i] ^= dbmask[i];
-
-    MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH);
-    for (i = 0; i < SHA_DIGEST_LENGTH; i++)
-	seed[i] ^= seedmask[i];
+	MGF1(dbmask, emlen - SHA_DIGEST_LENGTH, seed, SHA_DIGEST_LENGTH);
+	for (i = 0; i < emlen - SHA_DIGEST_LENGTH; i++)
+		db[i] ^= dbmask[i];
+	
+	MGF1(seedmask, SHA_DIGEST_LENGTH, db, emlen - SHA_DIGEST_LENGTH);
+	for (i = 0; i < SHA_DIGEST_LENGTH; i++)
+		seed[i] ^= seedmask[i];
 
-    OPENSSL_free(dbmask);
-    return (1);
-    }
+	OPENSSL_free(dbmask);
+	return 1;
+	}
 
 int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
 	const unsigned char *from, int flen, int num,
 	const unsigned char *param, int plen)
-    {
-    int i, dblen, mlen = -1;
-    const unsigned char *maskeddb;
-    int lzero;
-    unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
-
-    if (--num < 2 * SHA_DIGEST_LENGTH + 1)
-	goto decoding_err;
-
-    lzero = num - flen;
-    if (lzero < 0)
-	goto decoding_err;
-    maskeddb = from - lzero + SHA_DIGEST_LENGTH;
-    
-    dblen = num - SHA_DIGEST_LENGTH;
-    db = OPENSSL_malloc(dblen);
-    if (db == NULL)
 	{
-	RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
-	return (-1);
-	}
+	int i, dblen, mlen = -1;
+	const unsigned char *maskeddb;
+	int lzero;
+	unsigned char *db = NULL, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
+
+	if (--num < 2 * SHA_DIGEST_LENGTH + 1)
+		goto decoding_err;
+
+	lzero = num - flen;
+	if (lzero < 0)
+		goto decoding_err;
+	maskeddb = from - lzero + SHA_DIGEST_LENGTH;
+	
+	dblen = num - SHA_DIGEST_LENGTH;
+	db = OPENSSL_malloc(dblen);
+	if (db == NULL)
+		{
+		RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_OAEP, ERR_R_MALLOC_FAILURE);
+		return (-1);
+		}
 
-    MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen);
-    for (i = lzero; i < SHA_DIGEST_LENGTH; i++)
-	seed[i] ^= from[i - lzero];
+	MGF1(seed, SHA_DIGEST_LENGTH, maskeddb, dblen);
+	for (i = lzero; i < SHA_DIGEST_LENGTH; i++)
+		seed[i] ^= from[i - lzero];
   
-    MGF1(db, dblen, seed, SHA_DIGEST_LENGTH);
-    for (i = 0; i < dblen; i++)
-	db[i] ^= maskeddb[i];
-
-    EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1());
-
-    if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0)
-	goto decoding_err;
-    else
-	{
-	for (i = SHA_DIGEST_LENGTH; i < dblen; i++)
-	    if (db[i] != 0x00)
-		break;
-	if (db[i] != 0x01 || i++ >= dblen)
-	  goto decoding_err;
+	MGF1(db, dblen, seed, SHA_DIGEST_LENGTH);
+	for (i = 0; i < dblen; i++)
+		db[i] ^= maskeddb[i];
+
+	EVP_Digest((void *)param, plen, phash, NULL, EVP_sha1());
+	
+	if (memcmp(db, phash, SHA_DIGEST_LENGTH) != 0)
+		goto decoding_err;
 	else
-	    {
-	    mlen = dblen - i;
-	    if (tlen < mlen)
 		{
-		RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE);
-		mlen = -1;
+		for (i = SHA_DIGEST_LENGTH; i < dblen; i++)
+			if (db[i] != 0x00)
+				break;
+		if (db[i] != 0x01 || i++ >= dblen)
+			goto decoding_err;
+		else
+			{
+			mlen = dblen - i;
+			if (tlen < mlen)
+				{
+				RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_DATA_TOO_LARGE);
+				mlen = -1;
+				}
+			else
+				memcpy(to, db + i, mlen);
+			}
 		}
-	    else
-		memcpy(to, db + i, mlen);
-	    }
-	}
-    OPENSSL_free(db);
-    return (mlen);
-
+	OPENSSL_free(db);
+	return mlen;
+	
 decoding_err:
-    /* to avoid chosen ciphertext attacks, the error message should not reveal
-     * which kind of decoding error happened */
-    RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
-    if (db != NULL) OPENSSL_free(db);
-    return -1;
-    }
+	/* to avoid chosen ciphertext attacks, the error message should not reveal
+	 * which kind of decoding error happened */
+	RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_OAEP, RSA_R_OAEP_DECODING_ERROR);
+	if (db != NULL) OPENSSL_free(db);
+	return -1;
+	}
 
 int MGF1(unsigned char *mask, long len,
 	const unsigned char *seed, long seedlen)
-    {
-    long i, outlen = 0;
-    unsigned char cnt[4];
-    EVP_MD_CTX c;
-    unsigned char md[SHA_DIGEST_LENGTH];
-
-    EVP_MD_CTX_init(&c);
-    for (i = 0; outlen < len; i++)
 	{
-	cnt[0] = (unsigned char)((i >> 24) & 255);
-	cnt[1] = (unsigned char)((i >> 16) & 255);
-	cnt[2] = (unsigned char)((i >> 8)) & 255;
-	cnt[3] = (unsigned char)(i & 255);
-	EVP_DigestInit(&c,EVP_sha1());
-	EVP_DigestUpdate(&c, seed, seedlen);
-	EVP_DigestUpdate(&c, cnt, 4);
-	if (outlen + SHA_DIGEST_LENGTH <= len)
-	    {
-	    EVP_DigestFinal(&c, mask + outlen, NULL);
-	    outlen += SHA_DIGEST_LENGTH;
-	    }
-	else
-	    {
-	    EVP_DigestFinal(&c, md, NULL);
-	    memcpy(mask + outlen, md, len - outlen);
-	    outlen = len;
-	    }
+	long i, outlen = 0;
+	unsigned char cnt[4];
+	EVP_MD_CTX c;
+	unsigned char md[SHA_DIGEST_LENGTH];
+
+	EVP_MD_CTX_init(&c);
+	for (i = 0; outlen < len; i++)
+		{
+		cnt[0] = (unsigned char)((i >> 24) & 255);
+		cnt[1] = (unsigned char)((i >> 16) & 255);
+		cnt[2] = (unsigned char)((i >> 8)) & 255;
+		cnt[3] = (unsigned char)(i & 255);
+		EVP_DigestInit(&c,EVP_sha1());
+		EVP_DigestUpdate(&c, seed, seedlen);
+		EVP_DigestUpdate(&c, cnt, 4);
+		if (outlen + SHA_DIGEST_LENGTH <= len)
+			{
+			EVP_DigestFinal(&c, mask + outlen, NULL);
+			outlen += SHA_DIGEST_LENGTH;
+			}
+		else
+			{
+			EVP_DigestFinal(&c, md, NULL);
+			memcpy(mask + outlen, md, len - outlen);
+			outlen = len;
+			}
+		}
+	EVP_MD_CTX_cleanup(&c);
+	return 0;
 	}
-    EVP_MD_CTX_cleanup(&c);
-    return (0);
-    }
 #endif