Expose incremental SHA2 API

common/sha2.c

@@ -485,16 +485,60 @@ static const uint8_t iv_512[64] = {
     0x6b, 0x5b, 0xe0, 0xcd, 0x19, 0x13, 0x7e, 0x21, 0x79
 };
 
-int sha256(uint8_t *out, const uint8_t *in, size_t inlen) {
-    uint8_t h[32];
-    uint8_t padded[128];
-    uint64_t bytes = inlen;
-
+void sha256_inc_init(uint8_t *state) {
     for (size_t i = 0; i < 32; ++i) {
-        h[i] = iv_256[i];
+        state[i] = iv_256[i];
+    }
+    for (size_t i = 32; i < 40; ++i) {
+        state[i] = 0;
+    }
+}
+
+void sha384_inc_init(uint8_t *state) {
+    for (size_t i = 0; i < 64; ++i) {
+        state[i] = iv_384[i];
+    }
+    for (size_t i = 64; i < 72; ++i) {
+        state[i] = 0;
     }
+}
+
+void sha512_inc_init(uint8_t *state) {
+    for (size_t i = 0; i < 64; ++i) {
+        state[i] = iv_512[i];
+    }
+    for (size_t i = 64; i < 72; ++i) {
+        state[i] = 0;
+    }
+}
+
+void sha256_inc_blocks(uint8_t *state, const uint8_t *in, size_t inblocks) {
+    uint64_t bytes = load_bigendian_64(state + 32);
+
+    crypto_hashblocks_sha256(state, in, 64 * inblocks);
+    bytes += 64 * inblocks;
+
+    store_bigendian_64(state + 32, bytes);
+}
+
+void sha512_inc_blocks(uint8_t *state, const uint8_t *in, size_t inblocks) {
+    uint64_t bytes = load_bigendian_64(state + 64);
 
-    crypto_hashblocks_sha256(h, in, inlen);
+    crypto_hashblocks_sha256(state, in, 128 * inblocks);
+    bytes += 128 * inblocks;
+
+    store_bigendian_64(state + 64, bytes);
+}
+
+void sha384_inc_blocks(uint8_t *state, const uint8_t *in, size_t inblocks) {
+    sha512_inc_blocks(state, in, inblocks);
+}
+
+void sha256_inc_finalize(uint8_t *out, uint8_t *state, const uint8_t *in, size_t inlen) {
+    uint8_t padded[128];
+    uint64_t bytes = load_bigendian_64(state + 32) + inlen;
+
+    crypto_hashblocks_sha256(state, in, inlen);
     in += inlen;
     inlen &= 63;
     in -= inlen;
@@ -516,7 +560,7 @@ int sha256(uint8_t *out, const uint8_t *in, size_t inlen) {
         padded[61] = (uint8_t) (bytes >> 13);
         padded[62] = (uint8_t) (bytes >> 5);
         padded[63] = (uint8_t) (bytes << 3);
-        crypto_hashblocks_sha256(h, padded, 64);
+        crypto_hashblocks_sha256(state, padded, 64);
     } else {
         for (size_t i = inlen + 1; i < 120; ++i) {
             padded[i] = 0;
@@ -529,26 +573,19 @@ int sha256(uint8_t *out, const uint8_t *in, size_t inlen) {
         padded[125] = (uint8_t) (bytes >> 13);
         padded[126] = (uint8_t) (bytes >> 5);
         padded[127] = (uint8_t) (bytes << 3);
-        crypto_hashblocks_sha256(h, padded, 128);
+        crypto_hashblocks_sha256(state, padded, 128);
     }
 
     for (size_t i = 0; i < 32; ++i) {
-        out[i] = h[i];
+        out[i] = state[i];
     }
-
-    return 0;
 }
 
-int sha384(uint8_t *out, const uint8_t *in, size_t inlen) {
-    uint8_t h[64];
+void sha512_inc_finalize(uint8_t *out, uint8_t *state, const uint8_t *in, size_t inlen) {
     uint8_t padded[256];
-    uint64_t bytes = inlen;
+    uint64_t bytes = load_bigendian_64(state + 64) + inlen;
 
-    for (size_t i = 0; i < 64; ++i) {
-        h[i] = iv_384[i];
-    }
-
-    crypto_hashblocks_sha512(h, in, inlen);
+    crypto_hashblocks_sha512(state, in, inlen);
     in += inlen;
     inlen &= 127;
     in -= inlen;
@@ -571,7 +608,7 @@ int sha384(uint8_t *out, const uint8_t *in, size_t inlen) {
         padded[125] = (uint8_t) (bytes >> 13);
         padded[126] = (uint8_t) (bytes >> 5);
         padded[127] = (uint8_t) (bytes << 3);
-        crypto_hashblocks_sha512(h, padded, 128);
+        crypto_hashblocks_sha512(state, padded, 128);
     } else {
         for (size_t i = inlen + 1; i < 247; ++i) {
             padded[i] = 0;
@@ -585,68 +622,39 @@ int sha384(uint8_t *out, const uint8_t *in, size_t inlen) {
         padded[253] = (uint8_t) (bytes >> 13);
         padded[254] = (uint8_t) (bytes >> 5);
         padded[255] = (uint8_t) (bytes << 3);
-        crypto_hashblocks_sha512(h, padded, 256);
+        crypto_hashblocks_sha512(state, padded, 256);
     }
 
-    for (size_t i = 0; i < 48; ++i) {
-        out[i] = h[i];
+    for (size_t i = 0; i < 64; ++i) {
+        out[i] = state[i];
     }
-
-    return 0;
 }
 
-int sha512(uint8_t *out, const uint8_t *in, size_t inlen) {
-    uint8_t h[64];
-    uint8_t padded[256];
-    uint64_t bytes = inlen;
+void sha384_inc_finalize(uint8_t *out, uint8_t *state, const uint8_t *in, size_t inlen) {
+    sha512_inc_finalize(state, state, in, inlen);
 
-    for (size_t i = 0; i < 64; ++i) {
-        h[i] = iv_512[i];
+    for (size_t i = 0; i < 48; ++i) {
+        out[i] = state[i];
     }
+}
 
-    crypto_hashblocks_sha512(h, in, inlen);
-    in += inlen;
-    inlen &= 127;
-    in -= inlen;
+void sha256(uint8_t *out, const uint8_t *in, size_t inlen) {
+    uint8_t state[40];
 
-    for (size_t i = 0; i < inlen; ++i) {
-        padded[i] = in[i];
-    }
-    padded[inlen] = 0x80;
+    sha256_inc_init(state);
+    sha256_inc_finalize(out, state, in, inlen);
+}
 
-    if (inlen < 112) {
-        for (size_t i = inlen + 1; i < 119; ++i) {
-            padded[i] = 0;
-        }
-        padded[119] = (uint8_t) (bytes >> 61);
-        padded[120] = (uint8_t) (bytes >> 53);
-        padded[121] = (uint8_t) (bytes >> 45);
-        padded[122] = (uint8_t) (bytes >> 37);
-        padded[123] = (uint8_t) (bytes >> 29);
-        padded[124] = (uint8_t) (bytes >> 21);
-        padded[125] = (uint8_t) (bytes >> 13);
-        padded[126] = (uint8_t) (bytes >> 5);
-        padded[127] = (uint8_t) (bytes << 3);
-        crypto_hashblocks_sha512(h, padded, 128);
-    } else {
-        for (size_t i = inlen + 1; i < 247; ++i) {
-            padded[i] = 0;
-        }
-        padded[247] = (uint8_t) (bytes >> 61);
-        padded[248] = (uint8_t) (bytes >> 53);
-        padded[249] = (uint8_t) (bytes >> 45);
-        padded[250] = (uint8_t) (bytes >> 37);
-        padded[251] = (uint8_t) (bytes >> 29);
-        padded[252] = (uint8_t) (bytes >> 21);
-        padded[253] = (uint8_t) (bytes >> 13);
-        padded[254] = (uint8_t) (bytes >> 5);
-        padded[255] = (uint8_t) (bytes << 3);
-        crypto_hashblocks_sha512(h, padded, 256);
-    }
+void sha384(uint8_t *out, const uint8_t *in, size_t inlen) {
+    uint8_t state[72];
 
-    for (size_t i = 0; i < 64; ++i) {
-        out[i] = h[i];
-    }
+    sha384_inc_init(state);
+    sha384_inc_finalize(out, state, in, inlen);
+}
+
+void sha512(uint8_t *out, const uint8_t *in, size_t inlen) {
+    uint8_t state[72];
 
-    return 0;
+    sha512_inc_init(state);
+    sha512_inc_finalize(out, state, in, inlen);
 }

common/sha2.h

@@ -4,10 +4,19 @@
 #include <stddef.h>
 #include <stdint.h>
 
-int sha256(uint8_t *out, const uint8_t *in, size_t inlen);
+void sha256_inc_init(uint8_t *state);
+void sha256_inc_blocks(uint8_t *state, const uint8_t *in, size_t inblocks);
+void sha256_inc_finalize(uint8_t *out, uint8_t *state, const uint8_t *in, size_t inlen);
+void sha256(uint8_t *out, const uint8_t *in, size_t inlen);
 
-int sha384(uint8_t *out, const uint8_t *in, size_t inlen);
+void sha384_inc_init(uint8_t *state);
+void sha384_inc_blocks(uint8_t *state, const uint8_t *in, size_t inblocks);
+void sha384_inc_finalize(uint8_t *out, uint8_t *state, const uint8_t *in, size_t inlen);
+void sha384(uint8_t *out, const uint8_t *in, size_t inlen);
 
-int sha512(uint8_t *out, const uint8_t *in, size_t inlen);
+void sha512_inc_init(uint8_t *state);
+void sha512_inc_blocks(uint8_t *state, const uint8_t *in, size_t inblocks);
+void sha512_inc_finalize(uint8_t *out, uint8_t *state, const uint8_t *in, size_t inlen);
+void sha512(uint8_t *out, const uint8_t *in, size_t inlen);
 
 #endif

test/common/sha2.c

@@ -5,35 +5,62 @@
 #include <string.h>
 #include <inttypes.h>
 
-const unsigned char plaintext[44] = "The quick brown fox jumps over the lazy dog";
+const unsigned char plaintext[113] = "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu";
 
 const unsigned char expected_256[32] = {
-    0xd7, 0xa8, 0xfb, 0xb3, 0x07, 0xd7, 0x80, 0x94, 0x69, 0xca, 0x9a, 0xbc,
-    0xb0, 0x08, 0x2e, 0x4f, 0x8d, 0x56, 0x51, 0xe4, 0x6d, 0x3c, 0xdb, 0x76,
-    0x2d, 0x02, 0xd0, 0xbf, 0x37, 0xc9, 0xe5, 0x92,
+    0xcf, 0x5b, 0x16, 0xa7, 0x78, 0xaf, 0x83, 0x80, 0x03, 0x6c, 0xe5, 0x9e,
+    0x7b, 0x04, 0x92, 0x37, 0x0b, 0x24, 0x9b, 0x11, 0xe8, 0xf0, 0x7a, 0x51,
+    0xaf, 0xac, 0x45, 0x03, 0x7a, 0xfe, 0xe9, 0xd1
 };
 
 const unsigned char expected_384[48] = {
-    0xca, 0x73, 0x7f, 0x10, 0x14, 0xa4, 0x8f, 0x4c, 0x0b, 0x6d, 0xd4, 0x3c,
-    0xb1, 0x77, 0xb0, 0xaf, 0xd9, 0xe5, 0x16, 0x93, 0x67, 0x54, 0x4c, 0x49,
-    0x40, 0x11, 0xe3, 0x31, 0x7d, 0xbf, 0x9a, 0x50, 0x9c, 0xb1, 0xe5, 0xdc,
-    0x1e, 0x85, 0xa9, 0x41, 0xbb, 0xee, 0x3d, 0x7f, 0x2a, 0xfb, 0xc9, 0xb1,
+    0x09, 0x33, 0x0c, 0x33, 0xf7, 0x11, 0x47, 0xe8, 0x3d, 0x19, 0x2f, 0xc7,
+    0x82, 0xcd, 0x1b, 0x47, 0x53, 0x11, 0x1b, 0x17, 0x3b, 0x3b, 0x05, 0xd2,
+    0x2f, 0xa0, 0x80, 0x86, 0xe3, 0xb0, 0xf7, 0x12, 0xfc, 0xc7, 0xc7, 0x1a,
+    0x55, 0x7e, 0x2d, 0xb9, 0x66, 0xc3, 0xe9, 0xfa, 0x91, 0x74, 0x60, 0x39
 };
 
 const unsigned char expected_512[64] = {
-    0x07, 0xe5, 0x47, 0xd9, 0x58, 0x6f, 0x6a, 0x73, 0xf7, 0x3f, 0xba, 0xc0,
-    0x43, 0x5e, 0xd7, 0x69, 0x51, 0x21, 0x8f, 0xb7, 0xd0, 0xc8, 0xd7, 0x88,
-    0xa3, 0x09, 0xd7, 0x85, 0x43, 0x6b, 0xbb, 0x64, 0x2e, 0x93, 0xa2, 0x52,
-    0xa9, 0x54, 0xf2, 0x39, 0x12, 0x54, 0x7d, 0x1e, 0x8a, 0x3b, 0x5e, 0xd6,
-    0xe1, 0xbf, 0xd7, 0x09, 0x78, 0x21, 0x23, 0x3f, 0xa0, 0x53, 0x8f, 0x3d,
-    0xb8, 0x54, 0xfe, 0xe6,
+    0x8e, 0x95, 0x9b, 0x75, 0xda, 0xe3, 0x13, 0xda, 0x8c, 0xf4, 0xf7, 0x28,
+    0x14, 0xfc, 0x14, 0x3f, 0x8f, 0x77, 0x79, 0xc6, 0xeb, 0x9f, 0x7f, 0xa1,
+    0x72, 0x99, 0xae, 0xad, 0xb6, 0x88, 0x90, 0x18, 0x50, 0x1d, 0x28, 0x9e,
+    0x49, 0x00, 0xf7, 0xe4, 0x33, 0x1b, 0x99, 0xde, 0xc4, 0xb5, 0x43, 0x3a,
+    0xc7, 0xd3, 0x29, 0xee, 0xb6, 0xdd, 0x26, 0x54, 0x5e, 0x96, 0xe5, 0x5b,
+    0x87, 0x4b, 0xe9, 0x09
 };
 
+static int test_sha256_incremental(void) {
+    unsigned char output[32];
+    uint8_t state[40];
+    int i = 0;
+
+    sha256_inc_init(state);
+    sha256_inc_blocks(state, plaintext, 1);
+    sha256_inc_finalize(output, state, plaintext + 64, 112 - 64);
+
+    if (memcmp(expected_256, output, 32)) {
+        printf("ERROR sha256 incremental did not match sha256.\n");
+        printf("  Expected: ");
+        for (i = 0; i < 32; i++) {
+            printf("%02X", expected_256[i]);
+        }
+        printf("\n");
+        printf("  Received: ");
+        for (i = 0; i < 32; i++) {
+            printf("%02X", output[i]);
+        }
+        printf("\n");
+        return 1;
+    }
+
+    return 0;
+}
+
 static int test_sha256(void) {
     unsigned char output[32];
     int i = 0;
 
-    sha256(output, plaintext, 43);
+    sha256(output, plaintext, 112);
 
     if (memcmp(expected_256, output, 32)) {
         printf("ERROR sha256 output did not match test vector.\n");
@@ -57,7 +84,7 @@ static int test_sha384(void) {
     unsigned char output[48];
     int i = 0;
 
-    sha384(output, plaintext, 43);
+    sha384(output, plaintext, 112);
 
     if (memcmp(expected_384, output, 48)) {
         printf("ERROR sha384 output did not match test vector.\n");
@@ -81,7 +108,7 @@ static int test_sha512(void) {
     unsigned char output[64];
     int i = 0;
 
-    sha512(output, plaintext, 43);
+    sha512(output, plaintext, 112);
 
     if (memcmp(expected_512, output, 64)) {
         printf("ERROR sha512 output did not match test vector.\n");
@@ -104,6 +131,7 @@ static int test_sha512(void) {
 int main(void) {
     int result = 0;
     result += test_sha256();
+    result += test_sha256_incremental();
     result += test_sha384();
     result += test_sha512();