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-rw-r--r--crypto/modes/ccm128.c682
1 files changed, 360 insertions, 322 deletions
diff --git a/crypto/modes/ccm128.c b/crypto/modes/ccm128.c
index 3ce11d0d984c..c1ded0f9148a 100644
--- a/crypto/modes/ccm128.c
+++ b/crypto/modes/ccm128.c
@@ -6,7 +6,7 @@
* 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
@@ -58,384 +58,422 @@
#endif
#include <assert.h>
-/* First you setup M and L parameters and pass the key schedule.
- * This is called once per session setup... */
+/*
+ * First you setup M and L parameters and pass the key schedule. This is
+ * called once per session setup...
+ */
void CRYPTO_ccm128_init(CCM128_CONTEXT *ctx,
- unsigned int M,unsigned int L,void *key,block128_f block)
+ unsigned int M, unsigned int L, void *key,
+ block128_f block)
{
- memset(ctx->nonce.c,0,sizeof(ctx->nonce.c));
- ctx->nonce.c[0] = ((u8)(L-1)&7) | (u8)(((M-2)/2)&7)<<3;
- ctx->blocks = 0;
- ctx->block = block;
- ctx->key = key;
+ memset(ctx->nonce.c, 0, sizeof(ctx->nonce.c));
+ ctx->nonce.c[0] = ((u8)(L - 1) & 7) | (u8)(((M - 2) / 2) & 7) << 3;
+ ctx->blocks = 0;
+ ctx->block = block;
+ ctx->key = key;
}
/* !!! Following interfaces are to be called *once* per packet !!! */
/* Then you setup per-message nonce and pass the length of the message */
int CRYPTO_ccm128_setiv(CCM128_CONTEXT *ctx,
- const unsigned char *nonce,size_t nlen,size_t mlen)
+ const unsigned char *nonce, size_t nlen, size_t mlen)
{
- unsigned int L = ctx->nonce.c[0]&7; /* the L parameter */
+ unsigned int L = ctx->nonce.c[0] & 7; /* the L parameter */
- if (nlen<(14-L)) return -1; /* nonce is too short */
+ if (nlen < (14 - L))
+ return -1; /* nonce is too short */
- if (sizeof(mlen)==8 && L>=3) {
- ctx->nonce.c[8] = (u8)(mlen>>(56%(sizeof(mlen)*8)));
- ctx->nonce.c[9] = (u8)(mlen>>(48%(sizeof(mlen)*8)));
- ctx->nonce.c[10] = (u8)(mlen>>(40%(sizeof(mlen)*8)));
- ctx->nonce.c[11] = (u8)(mlen>>(32%(sizeof(mlen)*8)));
- }
- else
- ctx->nonce.u[1] = 0;
+ if (sizeof(mlen) == 8 && L >= 3) {
+ ctx->nonce.c[8] = (u8)(mlen >> (56 % (sizeof(mlen) * 8)));
+ ctx->nonce.c[9] = (u8)(mlen >> (48 % (sizeof(mlen) * 8)));
+ ctx->nonce.c[10] = (u8)(mlen >> (40 % (sizeof(mlen) * 8)));
+ ctx->nonce.c[11] = (u8)(mlen >> (32 % (sizeof(mlen) * 8)));
+ } else
+ ctx->nonce.u[1] = 0;
- ctx->nonce.c[12] = (u8)(mlen>>24);
- ctx->nonce.c[13] = (u8)(mlen>>16);
- ctx->nonce.c[14] = (u8)(mlen>>8);
- ctx->nonce.c[15] = (u8)mlen;
+ ctx->nonce.c[12] = (u8)(mlen >> 24);
+ ctx->nonce.c[13] = (u8)(mlen >> 16);
+ ctx->nonce.c[14] = (u8)(mlen >> 8);
+ ctx->nonce.c[15] = (u8)mlen;
- ctx->nonce.c[0] &= ~0x40; /* clear Adata flag */
- memcpy(&ctx->nonce.c[1],nonce,14-L);
+ ctx->nonce.c[0] &= ~0x40; /* clear Adata flag */
+ memcpy(&ctx->nonce.c[1], nonce, 14 - L);
- return 0;
+ return 0;
}
/* Then you pass additional authentication data, this is optional */
void CRYPTO_ccm128_aad(CCM128_CONTEXT *ctx,
- const unsigned char *aad,size_t alen)
-{ unsigned int i;
- block128_f block = ctx->block;
-
- if (alen==0) return;
-
- ctx->nonce.c[0] |= 0x40; /* set Adata flag */
- (*block)(ctx->nonce.c,ctx->cmac.c,ctx->key),
- ctx->blocks++;
-
- if (alen<(0x10000-0x100)) {
- ctx->cmac.c[0] ^= (u8)(alen>>8);
- ctx->cmac.c[1] ^= (u8)alen;
- i=2;
- }
- else if (sizeof(alen)==8 && alen>=(size_t)1<<(32%(sizeof(alen)*8))) {
- ctx->cmac.c[0] ^= 0xFF;
- ctx->cmac.c[1] ^= 0xFF;
- ctx->cmac.c[2] ^= (u8)(alen>>(56%(sizeof(alen)*8)));
- ctx->cmac.c[3] ^= (u8)(alen>>(48%(sizeof(alen)*8)));
- ctx->cmac.c[4] ^= (u8)(alen>>(40%(sizeof(alen)*8)));
- ctx->cmac.c[5] ^= (u8)(alen>>(32%(sizeof(alen)*8)));
- ctx->cmac.c[6] ^= (u8)(alen>>24);
- ctx->cmac.c[7] ^= (u8)(alen>>16);
- ctx->cmac.c[8] ^= (u8)(alen>>8);
- ctx->cmac.c[9] ^= (u8)alen;
- i=10;
- }
- else {
- ctx->cmac.c[0] ^= 0xFF;
- ctx->cmac.c[1] ^= 0xFE;
- ctx->cmac.c[2] ^= (u8)(alen>>24);
- ctx->cmac.c[3] ^= (u8)(alen>>16);
- ctx->cmac.c[4] ^= (u8)(alen>>8);
- ctx->cmac.c[5] ^= (u8)alen;
- i=6;
- }
-
- do {
- for(;i<16 && alen;++i,++aad,--alen)
- ctx->cmac.c[i] ^= *aad;
- (*block)(ctx->cmac.c,ctx->cmac.c,ctx->key),
- ctx->blocks++;
- i=0;
- } while (alen);
+ const unsigned char *aad, size_t alen)
+{
+ unsigned int i;
+ block128_f block = ctx->block;
+
+ if (alen == 0)
+ return;
+
+ ctx->nonce.c[0] |= 0x40; /* set Adata flag */
+ (*block) (ctx->nonce.c, ctx->cmac.c, ctx->key), ctx->blocks++;
+
+ if (alen < (0x10000 - 0x100)) {
+ ctx->cmac.c[0] ^= (u8)(alen >> 8);
+ ctx->cmac.c[1] ^= (u8)alen;
+ i = 2;
+ } else if (sizeof(alen) == 8
+ && alen >= (size_t)1 << (32 % (sizeof(alen) * 8))) {
+ ctx->cmac.c[0] ^= 0xFF;
+ ctx->cmac.c[1] ^= 0xFF;
+ ctx->cmac.c[2] ^= (u8)(alen >> (56 % (sizeof(alen) * 8)));
+ ctx->cmac.c[3] ^= (u8)(alen >> (48 % (sizeof(alen) * 8)));
+ ctx->cmac.c[4] ^= (u8)(alen >> (40 % (sizeof(alen) * 8)));
+ ctx->cmac.c[5] ^= (u8)(alen >> (32 % (sizeof(alen) * 8)));
+ ctx->cmac.c[6] ^= (u8)(alen >> 24);
+ ctx->cmac.c[7] ^= (u8)(alen >> 16);
+ ctx->cmac.c[8] ^= (u8)(alen >> 8);
+ ctx->cmac.c[9] ^= (u8)alen;
+ i = 10;
+ } else {
+ ctx->cmac.c[0] ^= 0xFF;
+ ctx->cmac.c[1] ^= 0xFE;
+ ctx->cmac.c[2] ^= (u8)(alen >> 24);
+ ctx->cmac.c[3] ^= (u8)(alen >> 16);
+ ctx->cmac.c[4] ^= (u8)(alen >> 8);
+ ctx->cmac.c[5] ^= (u8)alen;
+ i = 6;
+ }
+
+ do {
+ for (; i < 16 && alen; ++i, ++aad, --alen)
+ ctx->cmac.c[i] ^= *aad;
+ (*block) (ctx->cmac.c, ctx->cmac.c, ctx->key), ctx->blocks++;
+ i = 0;
+ } while (alen);
}
/* Finally you encrypt or decrypt the message */
-/* counter part of nonce may not be larger than L*8 bits,
- * L is not larger than 8, therefore 64-bit counter... */
-static void ctr64_inc(unsigned char *counter) {
- unsigned int n=8;
- u8 c;
-
- counter += 8;
- do {
- --n;
- c = counter[n];
- ++c;
- counter[n] = c;
- if (c) return;
- } while (n);
+/*
+ * counter part of nonce may not be larger than L*8 bits, L is not larger
+ * than 8, therefore 64-bit counter...
+ */
+static void ctr64_inc(unsigned char *counter)
+{
+ unsigned int n = 8;
+ u8 c;
+
+ counter += 8;
+ do {
+ --n;
+ c = counter[n];
+ ++c;
+ counter[n] = c;
+ if (c)
+ return;
+ } while (n);
}
int CRYPTO_ccm128_encrypt(CCM128_CONTEXT *ctx,
- const unsigned char *inp, unsigned char *out,
- size_t len)
+ const unsigned char *inp, unsigned char *out,
+ size_t len)
{
- size_t n;
- unsigned int i,L;
- unsigned char flags0 = ctx->nonce.c[0];
- block128_f block = ctx->block;
- void * key = ctx->key;
- union { u64 u[2]; u8 c[16]; } scratch;
-
- if (!(flags0&0x40))
- (*block)(ctx->nonce.c,ctx->cmac.c,key),
- ctx->blocks++;
-
- ctx->nonce.c[0] = L = flags0&7;
- for (n=0,i=15-L;i<15;++i) {
- n |= ctx->nonce.c[i];
- ctx->nonce.c[i]=0;
- n <<= 8;
- }
- n |= ctx->nonce.c[15]; /* reconstructed length */
- ctx->nonce.c[15]=1;
-
- if (n!=len) return -1; /* length mismatch */
-
- ctx->blocks += ((len+15)>>3)|1;
- if (ctx->blocks > (U64(1)<<61)) return -2; /* too much data */
-
- while (len>=16) {
+ size_t n;
+ unsigned int i, L;
+ unsigned char flags0 = ctx->nonce.c[0];
+ block128_f block = ctx->block;
+ void *key = ctx->key;
+ union {
+ u64 u[2];
+ u8 c[16];
+ } scratch;
+
+ if (!(flags0 & 0x40))
+ (*block) (ctx->nonce.c, ctx->cmac.c, key), ctx->blocks++;
+
+ ctx->nonce.c[0] = L = flags0 & 7;
+ for (n = 0, i = 15 - L; i < 15; ++i) {
+ n |= ctx->nonce.c[i];
+ ctx->nonce.c[i] = 0;
+ n <<= 8;
+ }
+ n |= ctx->nonce.c[15]; /* reconstructed length */
+ ctx->nonce.c[15] = 1;
+
+ if (n != len)
+ return -1; /* length mismatch */
+
+ ctx->blocks += ((len + 15) >> 3) | 1;
+ if (ctx->blocks > (U64(1) << 61))
+ return -2; /* too much data */
+
+ while (len >= 16) {
#if defined(STRICT_ALIGNMENT)
- union { u64 u[2]; u8 c[16]; } temp;
-
- memcpy (temp.c,inp,16);
- ctx->cmac.u[0] ^= temp.u[0];
- ctx->cmac.u[1] ^= temp.u[1];
+ union {
+ u64 u[2];
+ u8 c[16];
+ } temp;
+
+ memcpy(temp.c, inp, 16);
+ ctx->cmac.u[0] ^= temp.u[0];
+ ctx->cmac.u[1] ^= temp.u[1];
#else
- ctx->cmac.u[0] ^= ((u64*)inp)[0];
- ctx->cmac.u[1] ^= ((u64*)inp)[1];
+ ctx->cmac.u[0] ^= ((u64 *)inp)[0];
+ ctx->cmac.u[1] ^= ((u64 *)inp)[1];
#endif
- (*block)(ctx->cmac.c,ctx->cmac.c,key);
- (*block)(ctx->nonce.c,scratch.c,key);
- ctr64_inc(ctx->nonce.c);
+ (*block) (ctx->cmac.c, ctx->cmac.c, key);
+ (*block) (ctx->nonce.c, scratch.c, key);
+ ctr64_inc(ctx->nonce.c);
#if defined(STRICT_ALIGNMENT)
- temp.u[0] ^= scratch.u[0];
- temp.u[1] ^= scratch.u[1];
- memcpy(out,temp.c,16);
+ temp.u[0] ^= scratch.u[0];
+ temp.u[1] ^= scratch.u[1];
+ memcpy(out, temp.c, 16);
#else
- ((u64*)out)[0] = scratch.u[0]^((u64*)inp)[0];
- ((u64*)out)[1] = scratch.u[1]^((u64*)inp)[1];
+ ((u64 *)out)[0] = scratch.u[0] ^ ((u64 *)inp)[0];
+ ((u64 *)out)[1] = scratch.u[1] ^ ((u64 *)inp)[1];
#endif
- inp += 16;
- out += 16;
- len -= 16;
- }
-
- if (len) {
- for (i=0; i<len; ++i) ctx->cmac.c[i] ^= inp[i];
- (*block)(ctx->cmac.c,ctx->cmac.c,key);
- (*block)(ctx->nonce.c,scratch.c,key);
- for (i=0; i<len; ++i) out[i] = scratch.c[i]^inp[i];
- }
-
- for (i=15-L;i<16;++i)
- ctx->nonce.c[i]=0;
-
- (*block)(ctx->nonce.c,scratch.c,key);
- ctx->cmac.u[0] ^= scratch.u[0];
- ctx->cmac.u[1] ^= scratch.u[1];
-
- ctx->nonce.c[0] = flags0;
-
- return 0;
+ inp += 16;
+ out += 16;
+ len -= 16;
+ }
+
+ if (len) {
+ for (i = 0; i < len; ++i)
+ ctx->cmac.c[i] ^= inp[i];
+ (*block) (ctx->cmac.c, ctx->cmac.c, key);
+ (*block) (ctx->nonce.c, scratch.c, key);
+ for (i = 0; i < len; ++i)
+ out[i] = scratch.c[i] ^ inp[i];
+ }
+
+ for (i = 15 - L; i < 16; ++i)
+ ctx->nonce.c[i] = 0;
+
+ (*block) (ctx->nonce.c, scratch.c, key);
+ ctx->cmac.u[0] ^= scratch.u[0];
+ ctx->cmac.u[1] ^= scratch.u[1];
+
+ ctx->nonce.c[0] = flags0;
+
+ return 0;
}
int CRYPTO_ccm128_decrypt(CCM128_CONTEXT *ctx,
- const unsigned char *inp, unsigned char *out,
- size_t len)
+ const unsigned char *inp, unsigned char *out,
+ size_t len)
{
- size_t n;
- unsigned int i,L;
- unsigned char flags0 = ctx->nonce.c[0];
- block128_f block = ctx->block;
- void * key = ctx->key;
- union { u64 u[2]; u8 c[16]; } scratch;
-
- if (!(flags0&0x40))
- (*block)(ctx->nonce.c,ctx->cmac.c,key);
-
- ctx->nonce.c[0] = L = flags0&7;
- for (n=0,i=15-L;i<15;++i) {
- n |= ctx->nonce.c[i];
- ctx->nonce.c[i]=0;
- n <<= 8;
- }
- n |= ctx->nonce.c[15]; /* reconstructed length */
- ctx->nonce.c[15]=1;
-
- if (n!=len) return -1;
-
- while (len>=16) {
+ size_t n;
+ unsigned int i, L;
+ unsigned char flags0 = ctx->nonce.c[0];
+ block128_f block = ctx->block;
+ void *key = ctx->key;
+ union {
+ u64 u[2];
+ u8 c[16];
+ } scratch;
+
+ if (!(flags0 & 0x40))
+ (*block) (ctx->nonce.c, ctx->cmac.c, key);
+
+ ctx->nonce.c[0] = L = flags0 & 7;
+ for (n = 0, i = 15 - L; i < 15; ++i) {
+ n |= ctx->nonce.c[i];
+ ctx->nonce.c[i] = 0;
+ n <<= 8;
+ }
+ n |= ctx->nonce.c[15]; /* reconstructed length */
+ ctx->nonce.c[15] = 1;
+
+ if (n != len)
+ return -1;
+
+ while (len >= 16) {
#if defined(STRICT_ALIGNMENT)
- union { u64 u[2]; u8 c[16]; } temp;
+ union {
+ u64 u[2];
+ u8 c[16];
+ } temp;
#endif
- (*block)(ctx->nonce.c,scratch.c,key);
- ctr64_inc(ctx->nonce.c);
+ (*block) (ctx->nonce.c, scratch.c, key);
+ ctr64_inc(ctx->nonce.c);
#if defined(STRICT_ALIGNMENT)
- memcpy (temp.c,inp,16);
- ctx->cmac.u[0] ^= (scratch.u[0] ^= temp.u[0]);
- ctx->cmac.u[1] ^= (scratch.u[1] ^= temp.u[1]);
- memcpy (out,scratch.c,16);
+ memcpy(temp.c, inp, 16);
+ ctx->cmac.u[0] ^= (scratch.u[0] ^= temp.u[0]);
+ ctx->cmac.u[1] ^= (scratch.u[1] ^= temp.u[1]);
+ memcpy(out, scratch.c, 16);
#else
- ctx->cmac.u[0] ^= (((u64*)out)[0] = scratch.u[0]^((u64*)inp)[0]);
- ctx->cmac.u[1] ^= (((u64*)out)[1] = scratch.u[1]^((u64*)inp)[1]);
+ ctx->cmac.u[0] ^= (((u64 *)out)[0] = scratch.u[0] ^ ((u64 *)inp)[0]);
+ ctx->cmac.u[1] ^= (((u64 *)out)[1] = scratch.u[1] ^ ((u64 *)inp)[1]);
#endif
- (*block)(ctx->cmac.c,ctx->cmac.c,key);
+ (*block) (ctx->cmac.c, ctx->cmac.c, key);
- inp += 16;
- out += 16;
- len -= 16;
- }
+ inp += 16;
+ out += 16;
+ len -= 16;
+ }
- if (len) {
- (*block)(ctx->nonce.c,scratch.c,key);
- for (i=0; i<len; ++i)
- ctx->cmac.c[i] ^= (out[i] = scratch.c[i]^inp[i]);
- (*block)(ctx->cmac.c,ctx->cmac.c,key);
- }
+ if (len) {
+ (*block) (ctx->nonce.c, scratch.c, key);
+ for (i = 0; i < len; ++i)
+ ctx->cmac.c[i] ^= (out[i] = scratch.c[i] ^ inp[i]);
+ (*block) (ctx->cmac.c, ctx->cmac.c, key);
+ }
- for (i=15-L;i<16;++i)
- ctx->nonce.c[i]=0;
+ for (i = 15 - L; i < 16; ++i)
+ ctx->nonce.c[i] = 0;
- (*block)(ctx->nonce.c,scratch.c,key);
- ctx->cmac.u[0] ^= scratch.u[0];
- ctx->cmac.u[1] ^= scratch.u[1];
+ (*block) (ctx->nonce.c, scratch.c, key);
+ ctx->cmac.u[0] ^= scratch.u[0];
+ ctx->cmac.u[1] ^= scratch.u[1];
- ctx->nonce.c[0] = flags0;
+ ctx->nonce.c[0] = flags0;
- return 0;
+ return 0;
}
-static void ctr64_add (unsigned char *counter,size_t inc)
-{ size_t n=8, val=0;
-
- counter += 8;
- do {
- --n;
- val += counter[n] + (inc&0xff);
- counter[n] = (unsigned char)val;
- val >>= 8; /* carry bit */
- inc >>= 8;
- } while(n && (inc || val));
+static void ctr64_add(unsigned char *counter, size_t inc)
+{
+ size_t n = 8, val = 0;
+
+ counter += 8;
+ do {
+ --n;
+ val += counter[n] + (inc & 0xff);
+ counter[n] = (unsigned char)val;
+ val >>= 8; /* carry bit */
+ inc >>= 8;
+ } while (n && (inc || val));
}
int CRYPTO_ccm128_encrypt_ccm64(CCM128_CONTEXT *ctx,
- const unsigned char *inp, unsigned char *out,
- size_t len,ccm128_f stream)
+ const unsigned char *inp, unsigned char *out,
+ size_t len, ccm128_f stream)
{
- size_t n;
- unsigned int i,L;
- unsigned char flags0 = ctx->nonce.c[0];
- block128_f block = ctx->block;
- void * key = ctx->key;
- union { u64 u[2]; u8 c[16]; } scratch;
-
- if (!(flags0&0x40))
- (*block)(ctx->nonce.c,ctx->cmac.c,key),
- ctx->blocks++;
-
- ctx->nonce.c[0] = L = flags0&7;
- for (n=0,i=15-L;i<15;++i) {
- n |= ctx->nonce.c[i];
- ctx->nonce.c[i]=0;
- n <<= 8;
- }
- n |= ctx->nonce.c[15]; /* reconstructed length */
- ctx->nonce.c[15]=1;
-
- if (n!=len) return -1; /* length mismatch */
-
- ctx->blocks += ((len+15)>>3)|1;
- if (ctx->blocks > (U64(1)<<61)) return -2; /* too much data */
-
- if ((n=len/16)) {
- (*stream)(inp,out,n,key,ctx->nonce.c,ctx->cmac.c);
- n *= 16;
- inp += n;
- out += n;
- len -= n;
- if (len) ctr64_add(ctx->nonce.c,n/16);
- }
-
- if (len) {
- for (i=0; i<len; ++i) ctx->cmac.c[i] ^= inp[i];
- (*block)(ctx->cmac.c,ctx->cmac.c,key);
- (*block)(ctx->nonce.c,scratch.c,key);
- for (i=0; i<len; ++i) out[i] = scratch.c[i]^inp[i];
- }
-
- for (i=15-L;i<16;++i)
- ctx->nonce.c[i]=0;
-
- (*block)(ctx->nonce.c,scratch.c,key);
- ctx->cmac.u[0] ^= scratch.u[0];
- ctx->cmac.u[1] ^= scratch.u[1];
-
- ctx->nonce.c[0] = flags0;
-
- return 0;
+ size_t n;
+ unsigned int i, L;
+ unsigned char flags0 = ctx->nonce.c[0];
+ block128_f block = ctx->block;
+ void *key = ctx->key;
+ union {
+ u64 u[2];
+ u8 c[16];
+ } scratch;
+
+ if (!(flags0 & 0x40))
+ (*block) (ctx->nonce.c, ctx->cmac.c, key), ctx->blocks++;
+
+ ctx->nonce.c[0] = L = flags0 & 7;
+ for (n = 0, i = 15 - L; i < 15; ++i) {
+ n |= ctx->nonce.c[i];
+ ctx->nonce.c[i] = 0;
+ n <<= 8;
+ }
+ n |= ctx->nonce.c[15]; /* reconstructed length */
+ ctx->nonce.c[15] = 1;
+
+ if (n != len)
+ return -1; /* length mismatch */
+
+ ctx->blocks += ((len + 15) >> 3) | 1;
+ if (ctx->blocks > (U64(1) << 61))
+ return -2; /* too much data */
+
+ if ((n = len / 16)) {
+ (*stream) (inp, out, n, key, ctx->nonce.c, ctx->cmac.c);
+ n *= 16;
+ inp += n;
+ out += n;
+ len -= n;
+ if (len)
+ ctr64_add(ctx->nonce.c, n / 16);
+ }
+
+ if (len) {
+ for (i = 0; i < len; ++i)
+ ctx->cmac.c[i] ^= inp[i];
+ (*block) (ctx->cmac.c, ctx->cmac.c, key);
+ (*block) (ctx->nonce.c, scratch.c, key);
+ for (i = 0; i < len; ++i)
+ out[i] = scratch.c[i] ^ inp[i];
+ }
+
+ for (i = 15 - L; i < 16; ++i)
+ ctx->nonce.c[i] = 0;
+
+ (*block) (ctx->nonce.c, scratch.c, key);
+ ctx->cmac.u[0] ^= scratch.u[0];
+ ctx->cmac.u[1] ^= scratch.u[1];
+
+ ctx->nonce.c[0] = flags0;
+
+ return 0;
}
int CRYPTO_ccm128_decrypt_ccm64(CCM128_CONTEXT *ctx,
- const unsigned char *inp, unsigned char *out,
- size_t len,ccm128_f stream)
+ const unsigned char *inp, unsigned char *out,
+ size_t len, ccm128_f stream)
{
- size_t n;
- unsigned int i,L;
- unsigned char flags0 = ctx->nonce.c[0];
- block128_f block = ctx->block;
- void * key = ctx->key;
- union { u64 u[2]; u8 c[16]; } scratch;
-
- if (!(flags0&0x40))
- (*block)(ctx->nonce.c,ctx->cmac.c,key);
-
- ctx->nonce.c[0] = L = flags0&7;
- for (n=0,i=15-L;i<15;++i) {
- n |= ctx->nonce.c[i];
- ctx->nonce.c[i]=0;
- n <<= 8;
- }
- n |= ctx->nonce.c[15]; /* reconstructed length */
- ctx->nonce.c[15]=1;
-
- if (n!=len) return -1;
-
- if ((n=len/16)) {
- (*stream)(inp,out,n,key,ctx->nonce.c,ctx->cmac.c);
- n *= 16;
- inp += n;
- out += n;
- len -= n;
- if (len) ctr64_add(ctx->nonce.c,n/16);
- }
-
- if (len) {
- (*block)(ctx->nonce.c,scratch.c,key);
- for (i=0; i<len; ++i)
- ctx->cmac.c[i] ^= (out[i] = scratch.c[i]^inp[i]);
- (*block)(ctx->cmac.c,ctx->cmac.c,key);
- }
-
- for (i=15-L;i<16;++i)
- ctx->nonce.c[i]=0;
-
- (*block)(ctx->nonce.c,scratch.c,key);
- ctx->cmac.u[0] ^= scratch.u[0];
- ctx->cmac.u[1] ^= scratch.u[1];
-
- ctx->nonce.c[0] = flags0;
-
- return 0;
+ size_t n;
+ unsigned int i, L;
+ unsigned char flags0 = ctx->nonce.c[0];
+ block128_f block = ctx->block;
+ void *key = ctx->key;
+ union {
+ u64 u[2];
+ u8 c[16];
+ } scratch;
+
+ if (!(flags0 & 0x40))
+ (*block) (ctx->nonce.c, ctx->cmac.c, key);
+
+ ctx->nonce.c[0] = L = flags0 & 7;
+ for (n = 0, i = 15 - L; i < 15; ++i) {
+ n |= ctx->nonce.c[i];
+ ctx->nonce.c[i] = 0;
+ n <<= 8;
+ }
+ n |= ctx->nonce.c[15]; /* reconstructed length */
+ ctx->nonce.c[15] = 1;
+
+ if (n != len)
+ return -1;
+
+ if ((n = len / 16)) {
+ (*stream) (inp, out, n, key, ctx->nonce.c, ctx->cmac.c);
+ n *= 16;
+ inp += n;
+ out += n;
+ len -= n;
+ if (len)
+ ctr64_add(ctx->nonce.c, n / 16);
+ }
+
+ if (len) {
+ (*block) (ctx->nonce.c, scratch.c, key);
+ for (i = 0; i < len; ++i)
+ ctx->cmac.c[i] ^= (out[i] = scratch.c[i] ^ inp[i]);
+ (*block) (ctx->cmac.c, ctx->cmac.c, key);
+ }
+
+ for (i = 15 - L; i < 16; ++i)
+ ctx->nonce.c[i] = 0;
+
+ (*block) (ctx->nonce.c, scratch.c, key);
+ ctx->cmac.u[0] ^= scratch.u[0];
+ ctx->cmac.u[1] ^= scratch.u[1];
+
+ ctx->nonce.c[0] = flags0;
+
+ return 0;
}
-size_t CRYPTO_ccm128_tag(CCM128_CONTEXT *ctx,unsigned char *tag,size_t len)
-{ unsigned int M = (ctx->nonce.c[0]>>3)&7; /* the M parameter */
-
- M *= 2; M += 2;
- if (len<M) return 0;
- memcpy(tag,ctx->cmac.c,M);
- return M;
+size_t CRYPTO_ccm128_tag(CCM128_CONTEXT *ctx, unsigned char *tag, size_t len)
+{
+ unsigned int M = (ctx->nonce.c[0] >> 3) & 7; /* the M parameter */
+
+ M *= 2;
+ M += 2;
+ if (len < M)
+ return 0;
+ memcpy(tag, ctx->cmac.c, M);
+ return M;
}