X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Fcmac%2Fcmac.c;h=cb30e6d5be8b3bca83b956606bec3dcd0b63e6d6;hb=78c830785ca0f422502db9b201127ef1d9fe3966;hp=394777faefdb7a2b2570afd18246f9aaa9473ad1;hpb=73e45b2dd127b10d6259203082fe2b49aa268986;p=oweals%2Fopenssl.git

diff --git a/crypto/cmac/cmac.c b/crypto/cmac/cmac.c
index 394777faef..cb30e6d5be 100644
--- a/crypto/cmac/cmac.c
+++ b/crypto/cmac/cmac.c
@@ -1,5 +1,5 @@
-/* crypto/cmac/cmac.c */
-/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+/*
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project.
  */
 /* ====================================================================
@@ -10,7 +10,7 @@
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer. 
+ *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
@@ -51,221 +51,217 @@
  * ====================================================================
  */
 
-
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
 #include <openssl/cmac.h>
 
-struct CMAC_CTX_st
-	{
-	/* Cipher context to use */
-	EVP_CIPHER_CTX cctx;
-	/* Keys k1 and k2 */
-	unsigned char k1[EVP_MAX_BLOCK_LENGTH];
-	unsigned char k2[EVP_MAX_BLOCK_LENGTH];
-	/* Temporary block */
-	unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
-	/* Last (possibly partial) block */
-	unsigned char last_block[EVP_MAX_BLOCK_LENGTH];
-	/* Number of bytes in last block: -1 means context not initialised */
-	int nlast_block;
-	};
-
+struct CMAC_CTX_st {
+    /* Cipher context to use */
+    EVP_CIPHER_CTX *cctx;
+    /* Keys k1 and k2 */
+    unsigned char k1[EVP_MAX_BLOCK_LENGTH];
+    unsigned char k2[EVP_MAX_BLOCK_LENGTH];
+    /* Temporary block */
+    unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
+    /* Last (possibly partial) block */
+    unsigned char last_block[EVP_MAX_BLOCK_LENGTH];
+    /* Number of bytes in last block: -1 means context not initialised */
+    int nlast_block;
+};
 
 /* Make temporary keys K1 and K2 */
 
 static void make_kn(unsigned char *k1, const unsigned char *l, int bl)
-	{
-	int i;
-	unsigned char c = l[0], carry = c>>7, cnext;
+{
+    int i;
+    unsigned char c = l[0], carry = c >> 7, cnext;
 
-	/* Shift block to left, including carry */
-	for (i = 0; i < bl-1; i++, c = cnext)
-		k1[i] = (c << 1) | ((cnext=l[i+1]) >> 7);
+    /* Shift block to left, including carry */
+    for (i = 0; i < bl - 1; i++, c = cnext)
+        k1[i] = (c << 1) | ((cnext = l[i + 1]) >> 7);
 
-	/* If MSB set fixup with R */
-	k1[i] = (c << 1) ^ ((0-carry)&(bl==16?0x87:0x1b));
-	}
+    /* If MSB set fixup with R */
+    k1[i] = (c << 1) ^ ((0 - carry) & (bl == 16 ? 0x87 : 0x1b));
+}
 
 CMAC_CTX *CMAC_CTX_new(void)
-	{
-	CMAC_CTX *ctx;
-	ctx = OPENSSL_malloc(sizeof(CMAC_CTX));
-	if (!ctx)
-		return NULL;
-	EVP_CIPHER_CTX_init(&ctx->cctx);
-	ctx->nlast_block = -1;
-	return ctx;
-	}
+{
+    CMAC_CTX *ctx;
+
+    ctx = OPENSSL_malloc(sizeof(*ctx));
+    if (ctx == NULL)
+        return NULL;
+    ctx->cctx = EVP_CIPHER_CTX_new();
+    if (ctx->cctx == NULL) {
+        OPENSSL_free(ctx);
+        return NULL;
+    }
+    ctx->nlast_block = -1;
+    return ctx;
+}
 
 void CMAC_CTX_cleanup(CMAC_CTX *ctx)
-	{
-	EVP_CIPHER_CTX_cleanup(&ctx->cctx);
-	OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
-	OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH);
-	OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH);
-	OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH);
-	ctx->nlast_block = -1;
-	}
+{
+    EVP_CIPHER_CTX_free(ctx->cctx);
+    OPENSSL_cleanse(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
+    OPENSSL_cleanse(ctx->k1, EVP_MAX_BLOCK_LENGTH);
+    OPENSSL_cleanse(ctx->k2, EVP_MAX_BLOCK_LENGTH);
+    OPENSSL_cleanse(ctx->last_block, EVP_MAX_BLOCK_LENGTH);
+    ctx->nlast_block = -1;
+}
 
 EVP_CIPHER_CTX *CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx)
-	{
-	return &ctx->cctx;
-	}
+{
+    return ctx->cctx;
+}
 
 void CMAC_CTX_free(CMAC_CTX *ctx)
-	{
-	CMAC_CTX_cleanup(ctx);
-	OPENSSL_free(ctx);
-	}
+{
+    if (!ctx)
+        return;
+    CMAC_CTX_cleanup(ctx);
+    OPENSSL_free(ctx);
+}
 
 int CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in)
-	{
-	int bl;
-	if (in->nlast_block == -1)
-		return 0;
-	if (!EVP_CIPHER_CTX_copy(&out->cctx, &in->cctx))
-		return 0;
-	bl = M_EVP_CIPHER_CTX_block_size(&in->cctx);
-	memcpy(out->k1, in->k1, bl);
-	memcpy(out->k2, in->k2, bl);
-	memcpy(out->tbl, in->tbl, bl);
-	memcpy(out->last_block, in->last_block, bl);
-	out->nlast_block = in->nlast_block;
-	return 1;
-	}
+{
+    int bl;
+    if (in->nlast_block == -1)
+        return 0;
+    if (!EVP_CIPHER_CTX_copy(out->cctx, in->cctx))
+        return 0;
+    bl = EVP_CIPHER_CTX_block_size(in->cctx);
+    memcpy(out->k1, in->k1, bl);
+    memcpy(out->k2, in->k2, bl);
+    memcpy(out->tbl, in->tbl, bl);
+    memcpy(out->last_block, in->last_block, bl);
+    out->nlast_block = in->nlast_block;
+    return 1;
+}
 
-int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen, 
-			const EVP_CIPHER *cipher, ENGINE *impl)
-	{
-	static const unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH] = {0};
-	/* All zeros means restart */
-	if (!key && !cipher && !impl && keylen == 0)
-		{
-		/* Not initialised */
-		if (ctx->nlast_block == -1)
-			return 0;
-		if (!M_EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
-			return 0;
-		memset(ctx->tbl, 0, M_EVP_CIPHER_CTX_block_size(&ctx->cctx));
-		ctx->nlast_block = 0;
-		return 1;
-		}
-	/* Initialiase context */
-	if (cipher && !M_EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL))
-		return 0;
-	/* Non-NULL key means initialisation complete */
-	if (key)
-		{
-		int bl;
-		if (!M_EVP_CIPHER_CTX_cipher(&ctx->cctx))
-			return 0;
-		if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen))
-			return 0;
-		if (!M_EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv))
-			return 0;
-		bl = M_EVP_CIPHER_CTX_block_size(&ctx->cctx);
-		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, bl))
-			return 0;
-		make_kn(ctx->k1, ctx->tbl, bl);
-		make_kn(ctx->k2, ctx->k1, bl);
-		OPENSSL_cleanse(ctx->tbl, bl);
-		/* Reset context again ready for first data block */
-		if (!M_EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
-			return 0;
-		/* Zero tbl so resume works */
-		memset(ctx->tbl, 0, bl);
-		ctx->nlast_block = 0;
-		}
-	return 1;
-	}
+int CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
+              const EVP_CIPHER *cipher, ENGINE *impl)
+{
+    static const unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH] = { 0 };
+    /* All zeros means restart */
+    if (!key && !cipher && !impl && keylen == 0) {
+        /* Not initialised */
+        if (ctx->nlast_block == -1)
+            return 0;
+        if (!EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, NULL, zero_iv))
+            return 0;
+        memset(ctx->tbl, 0, EVP_CIPHER_CTX_block_size(ctx->cctx));
+        ctx->nlast_block = 0;
+        return 1;
+    }
+    /* Initialise context */
+    if (cipher && !EVP_EncryptInit_ex(ctx->cctx, cipher, impl, NULL, NULL))
+        return 0;
+    /* Non-NULL key means initialisation complete */
+    if (key) {
+        int bl;
+        if (!EVP_CIPHER_CTX_cipher(ctx->cctx))
+            return 0;
+        if (!EVP_CIPHER_CTX_set_key_length(ctx->cctx, keylen))
+            return 0;
+        if (!EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, key, zero_iv))
+            return 0;
+        bl = EVP_CIPHER_CTX_block_size(ctx->cctx);
+        if (!EVP_Cipher(ctx->cctx, ctx->tbl, zero_iv, bl))
+            return 0;
+        make_kn(ctx->k1, ctx->tbl, bl);
+        make_kn(ctx->k2, ctx->k1, bl);
+        OPENSSL_cleanse(ctx->tbl, bl);
+        /* Reset context again ready for first data block */
+        if (!EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, NULL, zero_iv))
+            return 0;
+        /* Zero tbl so resume works */
+        memset(ctx->tbl, 0, bl);
+        ctx->nlast_block = 0;
+    }
+    return 1;
+}
 
 int CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen)
-	{
-	const unsigned char *data = in;
-	size_t bl;
-	if (ctx->nlast_block == -1)
-		return 0;
-	if (dlen == 0)
-		return 1;
-	bl = M_EVP_CIPHER_CTX_block_size(&ctx->cctx);
-	/* Copy into partial block if we need to */
-	if (ctx->nlast_block > 0)
-		{
-		size_t nleft;
-		nleft = bl - ctx->nlast_block;
-		if (dlen < nleft)
-			nleft = dlen;
-		memcpy(ctx->last_block + ctx->nlast_block, data, nleft);
-		dlen -= nleft;
-		ctx->nlast_block += nleft;
-		/* If no more to process return */
-		if (dlen == 0)
-			return 1;
-		data += nleft;
-		/* Else not final block so encrypt it */
-		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block,bl))
-			return 0;
-		}
-	/* Encrypt all but one of the complete blocks left */
-	while(dlen > bl)
-		{
-		if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, bl))
-			return 0;
-		dlen -= bl;
-		data += bl;
-		}
-	/* Copy any data left to last block buffer */
-	memcpy(ctx->last_block, data, dlen);
-	ctx->nlast_block = dlen;
-	return 1;
+{
+    const unsigned char *data = in;
+    size_t bl;
+    if (ctx->nlast_block == -1)
+        return 0;
+    if (dlen == 0)
+        return 1;
+    bl = EVP_CIPHER_CTX_block_size(ctx->cctx);
+    /* Copy into partial block if we need to */
+    if (ctx->nlast_block > 0) {
+        size_t nleft;
+        nleft = bl - ctx->nlast_block;
+        if (dlen < nleft)
+            nleft = dlen;
+        memcpy(ctx->last_block + ctx->nlast_block, data, nleft);
+        dlen -= nleft;
+        ctx->nlast_block += nleft;
+        /* If no more to process return */
+        if (dlen == 0)
+            return 1;
+        data += nleft;
+        /* Else not final block so encrypt it */
+        if (!EVP_Cipher(ctx->cctx, ctx->tbl, ctx->last_block, bl))
+            return 0;
+    }
+    /* Encrypt all but one of the complete blocks left */
+    while (dlen > bl) {
+        if (!EVP_Cipher(ctx->cctx, ctx->tbl, data, bl))
+            return 0;
+        dlen -= bl;
+        data += bl;
+    }
+    /* Copy any data left to last block buffer */
+    memcpy(ctx->last_block, data, dlen);
+    ctx->nlast_block = dlen;
+    return 1;
 
-	}
+}
 
 int CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen)
-	{
-	int i, bl, lb;
-	if (ctx->nlast_block == -1)
-		return 0;
-	bl = M_EVP_CIPHER_CTX_block_size(&ctx->cctx);
-	*poutlen = (size_t)bl;
-	if (!out)
-		return 1;
-	lb = ctx->nlast_block;
-	/* Is last block complete? */
-	if (lb == bl)
-		{
-		for (i = 0; i < bl; i++)
-			out[i] = ctx->last_block[i] ^ ctx->k1[i];
-		}
-	else
-		{
-		ctx->last_block[lb] = 0x80;
-		if (bl - lb > 1)
-			memset(ctx->last_block + lb + 1, 0, bl - lb - 1);
-		for (i = 0; i < bl; i++)
-			out[i] = ctx->last_block[i] ^ ctx->k2[i];
-		}
-	if (!EVP_Cipher(&ctx->cctx, out, out, bl))
-		{
-		OPENSSL_cleanse(out, bl);	
-		return 0;
-		}
-	return 1;
-	}
+{
+    int i, bl, lb;
+    if (ctx->nlast_block == -1)
+        return 0;
+    bl = EVP_CIPHER_CTX_block_size(ctx->cctx);
+    *poutlen = (size_t)bl;
+    if (!out)
+        return 1;
+    lb = ctx->nlast_block;
+    /* Is last block complete? */
+    if (lb == bl) {
+        for (i = 0; i < bl; i++)
+            out[i] = ctx->last_block[i] ^ ctx->k1[i];
+    } else {
+        ctx->last_block[lb] = 0x80;
+        if (bl - lb > 1)
+            memset(ctx->last_block + lb + 1, 0, bl - lb - 1);
+        for (i = 0; i < bl; i++)
+            out[i] = ctx->last_block[i] ^ ctx->k2[i];
+    }
+    if (!EVP_Cipher(ctx->cctx, out, out, bl)) {
+        OPENSSL_cleanse(out, bl);
+        return 0;
+    }
+    return 1;
+}
 
 int CMAC_resume(CMAC_CTX *ctx)
-	{
-	if (ctx->nlast_block == -1)
-		return 0;
-	/* The buffer "tbl" containes the last fully encrypted block
-	 * which is the last IV (or all zeroes if no last encrypted block).
-	 * The last block has not been modified since CMAC_final().
-	 * So reinitliasing using the last decrypted block will allow
-	 * CMAC to continue after calling CMAC_Final(). 
-	 */
-	return M_EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, ctx->tbl);
-	}
+{
+    if (ctx->nlast_block == -1)
+        return 0;
+    /*
+     * The buffer "tbl" contains the last fully encrypted block which is the
+     * last IV (or all zeroes if no last encrypted block). The last block has
+     * not been modified since CMAC_final(). So reinitialising using the last
+     * decrypted block will allow CMAC to continue after calling
+     * CMAC_Final().
+     */
+    return EVP_EncryptInit_ex(ctx->cctx, NULL, NULL, NULL, ctx->tbl);
+}