diff options
Diffstat (limited to 'library/gcm.c')
| -rw-r--r-- | library/gcm.c | 1330 |
1 files changed, 1330 insertions, 0 deletions
diff --git a/library/gcm.c b/library/gcm.c new file mode 100644 index 00000000000..5dfac2349c8 --- /dev/null +++ b/library/gcm.c @@ -0,0 +1,1330 @@ +/* + * NIST SP800-38D compliant GCM implementation + * + * Copyright The Mbed TLS Contributors + * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later + */ + +/* + * http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf + * + * See also: + * [MGV] http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-revised-spec.pdf + * + * We use the algorithm described as Shoup's method with 4-bit tables in + * [MGV] 4.1, pp. 12-13, to enhance speed without using too much memory. + */ + +#include "common.h" + +#if defined(MBEDTLS_GCM_C) + +#include "mbedtls/gcm.h" +#include "mbedtls/platform.h" +#include "mbedtls/platform_util.h" +#include "mbedtls/error.h" +#include "mbedtls/constant_time.h" + +#if defined(MBEDTLS_BLOCK_CIPHER_C) +#include "block_cipher_internal.h" +#endif + +#include <string.h> + +#if defined(MBEDTLS_AESNI_C) +#include "aesni.h" +#endif + +#if defined(MBEDTLS_AESCE_C) +#include "aesce.h" +#endif + +#if !defined(MBEDTLS_GCM_ALT) + +/* Used to select the acceleration mechanism */ +#define MBEDTLS_GCM_ACC_SMALLTABLE 0 +#define MBEDTLS_GCM_ACC_LARGETABLE 1 +#define MBEDTLS_GCM_ACC_AESNI 2 +#define MBEDTLS_GCM_ACC_AESCE 3 + +/* + * Initialize a context + */ +void mbedtls_gcm_init(mbedtls_gcm_context *ctx) +{ + memset(ctx, 0, sizeof(mbedtls_gcm_context)); +} + +static inline void gcm_set_acceleration(mbedtls_gcm_context *ctx) +{ +#if defined(MBEDTLS_GCM_LARGE_TABLE) + ctx->acceleration = MBEDTLS_GCM_ACC_LARGETABLE; +#else + ctx->acceleration = MBEDTLS_GCM_ACC_SMALLTABLE; +#endif + +#if defined(MBEDTLS_AESNI_HAVE_CODE) + /* With CLMUL support, we need only h, not the rest of the table */ + if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) { + ctx->acceleration = MBEDTLS_GCM_ACC_AESNI; + } +#endif + +#if defined(MBEDTLS_AESCE_HAVE_CODE) + if (MBEDTLS_AESCE_HAS_SUPPORT()) { + ctx->acceleration = MBEDTLS_GCM_ACC_AESCE; + } +#endif +} + +static inline void gcm_gen_table_rightshift(uint64_t dst[2], const uint64_t src[2]) +{ + uint8_t *u8Dst = (uint8_t *) dst; + uint8_t *u8Src = (uint8_t *) src; + + MBEDTLS_PUT_UINT64_BE(MBEDTLS_GET_UINT64_BE(&src[1], 0) >> 1, &dst[1], 0); + u8Dst[8] |= (u8Src[7] & 0x01) << 7; + MBEDTLS_PUT_UINT64_BE(MBEDTLS_GET_UINT64_BE(&src[0], 0) >> 1, &dst[0], 0); + u8Dst[0] ^= (u8Src[15] & 0x01) ? 0xE1 : 0; +} + +/* + * Precompute small multiples of H, that is set + * HH[i] || HL[i] = H times i, + * where i is seen as a field element as in [MGV], ie high-order bits + * correspond to low powers of P. The result is stored in the same way, that + * is the high-order bit of HH corresponds to P^0 and the low-order bit of HL + * corresponds to P^127. + */ +static int gcm_gen_table(mbedtls_gcm_context *ctx) +{ + int ret, i, j; + uint64_t u64h[2] = { 0 }; + uint8_t *h = (uint8_t *) u64h; + +#if defined(MBEDTLS_BLOCK_CIPHER_C) + ret = mbedtls_block_cipher_encrypt(&ctx->block_cipher_ctx, h, h); +#else + size_t olen = 0; + ret = mbedtls_cipher_update(&ctx->cipher_ctx, h, 16, h, &olen); +#endif + if (ret != 0) { + return ret; + } + + gcm_set_acceleration(ctx); + + /* MBEDTLS_GCM_HTABLE_SIZE/2 = 1000 corresponds to 1 in GF(2^128) */ + ctx->H[MBEDTLS_GCM_HTABLE_SIZE/2][0] = u64h[0]; + ctx->H[MBEDTLS_GCM_HTABLE_SIZE/2][1] = u64h[1]; + + switch (ctx->acceleration) { +#if defined(MBEDTLS_AESNI_HAVE_CODE) + case MBEDTLS_GCM_ACC_AESNI: + return 0; +#endif + +#if defined(MBEDTLS_AESCE_HAVE_CODE) + case MBEDTLS_GCM_ACC_AESCE: + return 0; +#endif + + default: + /* 0 corresponds to 0 in GF(2^128) */ + ctx->H[0][0] = 0; + ctx->H[0][1] = 0; + + for (i = MBEDTLS_GCM_HTABLE_SIZE/4; i > 0; i >>= 1) { + gcm_gen_table_rightshift(ctx->H[i], ctx->H[i*2]); + } + +#if !defined(MBEDTLS_GCM_LARGE_TABLE) + /* pack elements of H as 64-bits ints, big-endian */ + for (i = MBEDTLS_GCM_HTABLE_SIZE/2; i > 0; i >>= 1) { + MBEDTLS_PUT_UINT64_BE(ctx->H[i][0], &ctx->H[i][0], 0); + MBEDTLS_PUT_UINT64_BE(ctx->H[i][1], &ctx->H[i][1], 0); + } +#endif + + for (i = 2; i < MBEDTLS_GCM_HTABLE_SIZE; i <<= 1) { + for (j = 1; j < i; j++) { + mbedtls_xor_no_simd((unsigned char *) ctx->H[i+j], + (unsigned char *) ctx->H[i], + (unsigned char *) ctx->H[j], + 16); + } + } + } + + return 0; +} + +int mbedtls_gcm_setkey(mbedtls_gcm_context *ctx, + mbedtls_cipher_id_t cipher, + const unsigned char *key, + unsigned int keybits) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + + if (keybits != 128 && keybits != 192 && keybits != 256) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } + +#if defined(MBEDTLS_BLOCK_CIPHER_C) + mbedtls_block_cipher_free(&ctx->block_cipher_ctx); + + if ((ret = mbedtls_block_cipher_setup(&ctx->block_cipher_ctx, cipher)) != 0) { + return ret; + } + + if ((ret = mbedtls_block_cipher_setkey(&ctx->block_cipher_ctx, key, keybits)) != 0) { + return ret; + } +#else + const mbedtls_cipher_info_t *cipher_info; + + cipher_info = mbedtls_cipher_info_from_values(cipher, keybits, + MBEDTLS_MODE_ECB); + if (cipher_info == NULL) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } + + if (mbedtls_cipher_info_get_block_size(cipher_info) != 16) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } + + mbedtls_cipher_free(&ctx->cipher_ctx); + + if ((ret = mbedtls_cipher_setup(&ctx->cipher_ctx, cipher_info)) != 0) { + return ret; + } + + if ((ret = mbedtls_cipher_setkey(&ctx->cipher_ctx, key, keybits, + MBEDTLS_ENCRYPT)) != 0) { + return ret; + } +#endif + + if ((ret = gcm_gen_table(ctx)) != 0) { + return ret; + } + + return 0; +} + +#if defined(MBEDTLS_GCM_LARGE_TABLE) +static const uint16_t last8[256] = { + 0x0000, 0xc201, 0x8403, 0x4602, 0x0807, 0xca06, 0x8c04, 0x4e05, + 0x100e, 0xd20f, 0x940d, 0x560c, 0x1809, 0xda08, 0x9c0a, 0x5e0b, + 0x201c, 0xe21d, 0xa41f, 0x661e, 0x281b, 0xea1a, 0xac18, 0x6e19, + 0x3012, 0xf213, 0xb411, 0x7610, 0x3815, 0xfa14, 0xbc16, 0x7e17, + 0x4038, 0x8239, 0xc43b, 0x063a, 0x483f, 0x8a3e, 0xcc3c, 0x0e3d, + 0x5036, 0x9237, 0xd435, 0x1634, 0x5831, 0x9a30, 0xdc32, 0x1e33, + 0x6024, 0xa225, 0xe427, 0x2626, 0x6823, 0xaa22, 0xec20, 0x2e21, + 0x702a, 0xb22b, 0xf429, 0x3628, 0x782d, 0xba2c, 0xfc2e, 0x3e2f, + 0x8070, 0x4271, 0x0473, 0xc672, 0x8877, 0x4a76, 0x0c74, 0xce75, + 0x907e, 0x527f, 0x147d, 0xd67c, 0x9879, 0x5a78, 0x1c7a, 0xde7b, + 0xa06c, 0x626d, 0x246f, 0xe66e, 0xa86b, 0x6a6a, 0x2c68, 0xee69, + 0xb062, 0x7263, 0x3461, 0xf660, 0xb865, 0x7a64, 0x3c66, 0xfe67, + 0xc048, 0x0249, 0x444b, 0x864a, 0xc84f, 0x0a4e, 0x4c4c, 0x8e4d, + 0xd046, 0x1247, 0x5445, 0x9644, 0xd841, 0x1a40, 0x5c42, 0x9e43, + 0xe054, 0x2255, 0x6457, 0xa656, 0xe853, 0x2a52, 0x6c50, 0xae51, + 0xf05a, 0x325b, 0x7459, 0xb658, 0xf85d, 0x3a5c, 0x7c5e, 0xbe5f, + 0x00e1, 0xc2e0, 0x84e2, 0x46e3, 0x08e6, 0xcae7, 0x8ce5, 0x4ee4, + 0x10ef, 0xd2ee, 0x94ec, 0x56ed, 0x18e8, 0xdae9, 0x9ceb, 0x5eea, + 0x20fd, 0xe2fc, 0xa4fe, 0x66ff, 0x28fa, 0xeafb, 0xacf9, 0x6ef8, + 0x30f3, 0xf2f2, 0xb4f0, 0x76f1, 0x38f4, 0xfaf5, 0xbcf7, 0x7ef6, + 0x40d9, 0x82d8, 0xc4da, 0x06db, 0x48de, 0x8adf, 0xccdd, 0x0edc, + 0x50d7, 0x92d6, 0xd4d4, 0x16d5, 0x58d0, 0x9ad1, 0xdcd3, 0x1ed2, + 0x60c5, 0xa2c4, 0xe4c6, 0x26c7, 0x68c2, 0xaac3, 0xecc1, 0x2ec0, + 0x70cb, 0xb2ca, 0xf4c8, 0x36c9, 0x78cc, 0xbacd, 0xfccf, 0x3ece, + 0x8091, 0x4290, 0x0492, 0xc693, 0x8896, 0x4a97, 0x0c95, 0xce94, + 0x909f, 0x529e, 0x149c, 0xd69d, 0x9898, 0x5a99, 0x1c9b, 0xde9a, + 0xa08d, 0x628c, 0x248e, 0xe68f, 0xa88a, 0x6a8b, 0x2c89, 0xee88, + 0xb083, 0x7282, 0x3480, 0xf681, 0xb884, 0x7a85, 0x3c87, 0xfe86, + 0xc0a9, 0x02a8, 0x44aa, 0x86ab, 0xc8ae, 0x0aaf, 0x4cad, 0x8eac, + 0xd0a7, 0x12a6, 0x54a4, 0x96a5, 0xd8a0, 0x1aa1, 0x5ca3, 0x9ea2, + 0xe0b5, 0x22b4, 0x64b6, 0xa6b7, 0xe8b2, 0x2ab3, 0x6cb1, 0xaeb0, + 0xf0bb, 0x32ba, 0x74b8, 0xb6b9, 0xf8bc, 0x3abd, 0x7cbf, 0xbebe +}; + +static void gcm_mult_largetable(uint8_t *output, const uint8_t *x, uint64_t H[256][2]) +{ + int i; + uint64_t u64z[2]; + uint16_t *u16z = (uint16_t *) u64z; + uint8_t *u8z = (uint8_t *) u64z; + uint8_t rem; + + u64z[0] = 0; + u64z[1] = 0; + + if (MBEDTLS_IS_BIG_ENDIAN) { + for (i = 15; i > 0; i--) { + mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[x[i]], 16); + rem = u8z[15]; + + u64z[1] >>= 8; + u8z[8] = u8z[7]; + u64z[0] >>= 8; + + u16z[0] ^= MBEDTLS_GET_UINT16_LE(&last8[rem], 0); + } + } else { + for (i = 15; i > 0; i--) { + mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[x[i]], 16); + rem = u8z[15]; + + u64z[1] <<= 8; + u8z[8] = u8z[7]; + u64z[0] <<= 8; + + u16z[0] ^= last8[rem]; + } + } + + mbedtls_xor_no_simd(output, u8z, (uint8_t *) H[x[0]], 16); +} +#else +/* + * Shoup's method for multiplication use this table with + * last4[x] = x times P^128 + * where x and last4[x] are seen as elements of GF(2^128) as in [MGV] + */ +static const uint16_t last4[16] = +{ + 0x0000, 0x1c20, 0x3840, 0x2460, + 0x7080, 0x6ca0, 0x48c0, 0x54e0, + 0xe100, 0xfd20, 0xd940, 0xc560, + 0x9180, 0x8da0, 0xa9c0, 0xb5e0 +}; + +static void gcm_mult_smalltable(uint8_t *output, const uint8_t *x, uint64_t H[16][2]) +{ + int i = 0; + unsigned char lo, hi, rem; + uint64_t u64z[2]; + const uint64_t *pu64z = NULL; + uint8_t *u8z = (uint8_t *) u64z; + + lo = x[15] & 0xf; + hi = (x[15] >> 4) & 0xf; + + pu64z = H[lo]; + + rem = (unsigned char) pu64z[1] & 0xf; + u64z[1] = (pu64z[0] << 60) | (pu64z[1] >> 4); + u64z[0] = (pu64z[0] >> 4); + u64z[0] ^= (uint64_t) last4[rem] << 48; + mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[hi], 16); + + for (i = 14; i >= 0; i--) { + lo = x[i] & 0xf; + hi = (x[i] >> 4) & 0xf; + + rem = (unsigned char) u64z[1] & 0xf; + u64z[1] = (u64z[0] << 60) | (u64z[1] >> 4); + u64z[0] = (u64z[0] >> 4); + u64z[0] ^= (uint64_t) last4[rem] << 48; + mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[lo], 16); + + rem = (unsigned char) u64z[1] & 0xf; + u64z[1] = (u64z[0] << 60) | (u64z[1] >> 4); + u64z[0] = (u64z[0] >> 4); + u64z[0] ^= (uint64_t) last4[rem] << 48; + mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[hi], 16); + } + + MBEDTLS_PUT_UINT64_BE(u64z[0], output, 0); + MBEDTLS_PUT_UINT64_BE(u64z[1], output, 8); +} +#endif + +/* + * Sets output to x times H using the precomputed tables. + * x and output are seen as elements of GF(2^128) as in [MGV]. + */ +static void gcm_mult(mbedtls_gcm_context *ctx, const unsigned char x[16], + unsigned char output[16]) +{ + switch (ctx->acceleration) { +#if defined(MBEDTLS_AESNI_HAVE_CODE) + case MBEDTLS_GCM_ACC_AESNI: + mbedtls_aesni_gcm_mult(output, x, (uint8_t *) ctx->H[MBEDTLS_GCM_HTABLE_SIZE/2]); + break; +#endif + +#if defined(MBEDTLS_AESCE_HAVE_CODE) + case MBEDTLS_GCM_ACC_AESCE: + mbedtls_aesce_gcm_mult(output, x, (uint8_t *) ctx->H[MBEDTLS_GCM_HTABLE_SIZE/2]); + break; +#endif + +#if defined(MBEDTLS_GCM_LARGE_TABLE) + case MBEDTLS_GCM_ACC_LARGETABLE: + gcm_mult_largetable(output, x, ctx->H); + break; +#else + case MBEDTLS_GCM_ACC_SMALLTABLE: + gcm_mult_smalltable(output, x, ctx->H); + break; +#endif + } + + return; +} + +int mbedtls_gcm_starts(mbedtls_gcm_context *ctx, + int mode, + const unsigned char *iv, size_t iv_len) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + unsigned char work_buf[16]; + const unsigned char *p; + size_t use_len; + uint64_t iv_bits; +#if !defined(MBEDTLS_BLOCK_CIPHER_C) + size_t olen = 0; +#endif + + /* IV is limited to 2^64 bits, so 2^61 bytes */ + /* IV is not allowed to be zero length */ + if (iv_len == 0 || (uint64_t) iv_len >> 61 != 0) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } + + memset(ctx->y, 0x00, sizeof(ctx->y)); + memset(ctx->buf, 0x00, sizeof(ctx->buf)); + + ctx->mode = mode; + ctx->len = 0; + ctx->add_len = 0; + + if (iv_len == 12) { + memcpy(ctx->y, iv, iv_len); + ctx->y[15] = 1; + } else { + memset(work_buf, 0x00, 16); + iv_bits = (uint64_t) iv_len * 8; + MBEDTLS_PUT_UINT64_BE(iv_bits, work_buf, 8); + + p = iv; + while (iv_len > 0) { + use_len = (iv_len < 16) ? iv_len : 16; + +#if defined(MBEDTLS_COMPILER_IS_GCC) && (MBEDTLS_GCC_VERSION >= 70110) +#pragma GCC diagnostic push +#pragma GCC diagnostic warning "-Wstringop-overflow=0" +#endif + + mbedtls_xor(ctx->y, ctx->y, p, use_len); + +#if defined(MBEDTLS_COMPILER_IS_GCC) && (MBEDTLS_GCC_VERSION >= 70110) +#pragma GCC diagnostic pop +#endif + + gcm_mult(ctx, ctx->y, ctx->y); + + iv_len -= use_len; + p += use_len; + } + + mbedtls_xor(ctx->y, ctx->y, work_buf, 16); + + gcm_mult(ctx, ctx->y, ctx->y); + } + + +#if defined(MBEDTLS_BLOCK_CIPHER_C) + ret = mbedtls_block_cipher_encrypt(&ctx->block_cipher_ctx, ctx->y, ctx->base_ectr); +#else + ret = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ctx->base_ectr, &olen); +#endif + if (ret != 0) { + return ret; + } + + return 0; +} + +/** + * mbedtls_gcm_context::buf contains the partial state of the computation of + * the authentication tag. + * mbedtls_gcm_context::add_len and mbedtls_gcm_context::len indicate + * different stages of the computation: + * * len == 0 && add_len == 0: initial state + * * len == 0 && add_len % 16 != 0: the first `add_len % 16` bytes have + * a partial block of AD that has been + * xored in but not yet multiplied in. + * * len == 0 && add_len % 16 == 0: the authentication tag is correct if + * the data ends now. + * * len % 16 != 0: the first `len % 16` bytes have + * a partial block of ciphertext that has + * been xored in but not yet multiplied in. + * * len > 0 && len % 16 == 0: the authentication tag is correct if + * the data ends now. + */ +int mbedtls_gcm_update_ad(mbedtls_gcm_context *ctx, + const unsigned char *add, size_t add_len) +{ + const unsigned char *p; + size_t use_len, offset; + uint64_t new_add_len; + + /* AD is limited to 2^64 bits, ie 2^61 bytes + * Also check for possible overflow */ +#if SIZE_MAX > 0xFFFFFFFFFFFFFFFFULL + if (add_len > 0xFFFFFFFFFFFFFFFFULL) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } +#endif + new_add_len = ctx->add_len + (uint64_t) add_len; + if (new_add_len < ctx->add_len || new_add_len >> 61 != 0) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } + + offset = ctx->add_len % 16; + p = add; + + if (offset != 0) { + use_len = 16 - offset; + if (use_len > add_len) { + use_len = add_len; + } + + mbedtls_xor(ctx->buf + offset, ctx->buf + offset, p, use_len); + + if (offset + use_len == 16) { + gcm_mult(ctx, ctx->buf, ctx->buf); + } + + ctx->add_len += use_len; + add_len -= use_len; + p += use_len; + } + + ctx->add_len += add_len; + + while (add_len >= 16) { + mbedtls_xor(ctx->buf, ctx->buf, p, 16); + + gcm_mult(ctx, ctx->buf, ctx->buf); + + add_len -= 16; + p += 16; + } + + if (add_len > 0) { + mbedtls_xor(ctx->buf, ctx->buf, p, add_len); + } + + return 0; +} + +/* Increment the counter. */ +static void gcm_incr(unsigned char y[16]) +{ + uint32_t x = MBEDTLS_GET_UINT32_BE(y, 12); + x++; + MBEDTLS_PUT_UINT32_BE(x, y, 12); +} + +/* Calculate and apply the encryption mask. Process use_len bytes of data, + * starting at position offset in the mask block. */ +static int gcm_mask(mbedtls_gcm_context *ctx, + unsigned char ectr[16], + size_t offset, size_t use_len, + const unsigned char *input, + unsigned char *output) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + +#if defined(MBEDTLS_BLOCK_CIPHER_C) + ret = mbedtls_block_cipher_encrypt(&ctx->block_cipher_ctx, ctx->y, ectr); +#else + size_t olen = 0; + ret = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ectr, &olen); +#endif + if (ret != 0) { + mbedtls_platform_zeroize(ectr, 16); + return ret; + } + + if (ctx->mode == MBEDTLS_GCM_DECRYPT) { + mbedtls_xor(ctx->buf + offset, ctx->buf + offset, input, use_len); + } + mbedtls_xor(output, ectr + offset, input, use_len); + if (ctx->mode == MBEDTLS_GCM_ENCRYPT) { + mbedtls_xor(ctx->buf + offset, ctx->buf + offset, output, use_len); + } + + return 0; +} + +int mbedtls_gcm_update(mbedtls_gcm_context *ctx, + const unsigned char *input, size_t input_length, + unsigned char *output, size_t output_size, + size_t *output_length) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + const unsigned char *p = input; + unsigned char *out_p = output; + size_t offset; + unsigned char ectr[16] = { 0 }; + + if (output_size < input_length) { + return MBEDTLS_ERR_GCM_BUFFER_TOO_SMALL; + } + *output_length = input_length; + + /* Exit early if input_length==0 so that we don't do any pointer arithmetic + * on a potentially null pointer. + * Returning early also means that the last partial block of AD remains + * untouched for mbedtls_gcm_finish */ + if (input_length == 0) { + return 0; + } + + if (output > input && (size_t) (output - input) < input_length) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } + + /* Total length is restricted to 2^39 - 256 bits, ie 2^36 - 2^5 bytes + * Also check for possible overflow */ + if (ctx->len + input_length < ctx->len || + (uint64_t) ctx->len + input_length > 0xFFFFFFFE0ull) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } + + if (ctx->len == 0 && ctx->add_len % 16 != 0) { + gcm_mult(ctx, ctx->buf, ctx->buf); + } + + offset = ctx->len % 16; + if (offset != 0) { + size_t use_len = 16 - offset; + if (use_len > input_length) { + use_len = input_length; + } + + if ((ret = gcm_mask(ctx, ectr, offset, use_len, p, out_p)) != 0) { + return ret; + } + + if (offset + use_len == 16) { + gcm_mult(ctx, ctx->buf, ctx->buf); + } + + ctx->len += use_len; + input_length -= use_len; + p += use_len; + out_p += use_len; + } + + ctx->len += input_length; + + while (input_length >= 16) { + gcm_incr(ctx->y); + if ((ret = gcm_mask(ctx, ectr, 0, 16, p, out_p)) != 0) { + return ret; + } + + gcm_mult(ctx, ctx->buf, ctx->buf); + + input_length -= 16; + p += 16; + out_p += 16; + } + + if (input_length > 0) { + gcm_incr(ctx->y); + if ((ret = gcm_mask(ctx, ectr, 0, input_length, p, out_p)) != 0) { + return ret; + } + } + + mbedtls_platform_zeroize(ectr, sizeof(ectr)); + return 0; +} + +int mbedtls_gcm_finish(mbedtls_gcm_context *ctx, + unsigned char *output, size_t output_size, + size_t *output_length, + unsigned char *tag, size_t tag_len) +{ + unsigned char work_buf[16]; + uint64_t orig_len; + uint64_t orig_add_len; + + /* We never pass any output in finish(). The output parameter exists only + * for the sake of alternative implementations. */ + (void) output; + (void) output_size; + *output_length = 0; + + /* Total length is restricted to 2^39 - 256 bits, ie 2^36 - 2^5 bytes + * and AD length is restricted to 2^64 bits, ie 2^61 bytes so neither of + * the two multiplications would overflow. */ + orig_len = ctx->len * 8; + orig_add_len = ctx->add_len * 8; + + if (ctx->len == 0 && ctx->add_len % 16 != 0) { + gcm_mult(ctx, ctx->buf, ctx->buf); + } + + if (tag_len > 16 || tag_len < 4) { + return MBEDTLS_ERR_GCM_BAD_INPUT; + } + + if (ctx->len % 16 != 0) { + gcm_mult(ctx, ctx->buf, ctx->buf); + } + + memcpy(tag, ctx->base_ectr, tag_len); + + if (orig_len || orig_add_len) { + memset(work_buf, 0x00, 16); + + MBEDTLS_PUT_UINT32_BE((orig_add_len >> 32), work_buf, 0); + MBEDTLS_PUT_UINT32_BE((orig_add_len), work_buf, 4); + MBEDTLS_PUT_UINT32_BE((orig_len >> 32), work_buf, 8); + MBEDTLS_PUT_UINT32_BE((orig_len), work_buf, 12); + + mbedtls_xor(ctx->buf, ctx->buf, work_buf, 16); + + gcm_mult(ctx, ctx->buf, ctx->buf); + + mbedtls_xor(tag, tag, ctx->buf, tag_len); + } + + return 0; +} + +int mbedtls_gcm_crypt_and_tag(mbedtls_gcm_context *ctx, + int mode, + size_t length, + const unsigned char *iv, + size_t iv_len, + const unsigned char *add, + size_t add_len, + const unsigned char *input, + unsigned char *output, + size_t tag_len, + unsigned char *tag) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + size_t olen; + + if ((ret = mbedtls_gcm_starts(ctx, mode, iv, iv_len)) != 0) { + return ret; + } + + if ((ret = mbedtls_gcm_update_ad(ctx, add, add_len)) != 0) { + return ret; + } + + if ((ret = mbedtls_gcm_update(ctx, input, length, + output, length, &olen)) != 0) { + return ret; + } + + if ((ret = mbedtls_gcm_finish(ctx, NULL, 0, &olen, tag, tag_len)) != 0) { + return ret; + } + + return 0; +} + +int mbedtls_gcm_auth_decrypt(mbedtls_gcm_context *ctx, + size_t length, + const unsigned char *iv, + size_t iv_len, + const unsigned char *add, + size_t add_len, + const unsigned char *tag, + size_t tag_len, + const unsigned char *input, + unsigned char *output) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + unsigned char check_tag[16]; + int diff; + + if ((ret = mbedtls_gcm_crypt_and_tag(ctx, MBEDTLS_GCM_DECRYPT, length, + iv, iv_len, add, add_len, + input, output, tag_len, check_tag)) != 0) { + return ret; + } + + /* Check tag in "constant-time" */ + diff = mbedtls_ct_memcmp(tag, check_tag, tag_len); + + if (diff != 0) { + mbedtls_platform_zeroize(output, length); + return MBEDTLS_ERR_GCM_AUTH_FAILED; + } + + return 0; +} + +void mbedtls_gcm_free(mbedtls_gcm_context *ctx) +{ + if (ctx == NULL) { + return; + } +#if defined(MBEDTLS_BLOCK_CIPHER_C) + mbedtls_block_cipher_free(&ctx->block_cipher_ctx); +#else + mbedtls_cipher_free(&ctx->cipher_ctx); +#endif + mbedtls_platform_zeroize(ctx, sizeof(mbedtls_gcm_context)); +} + +#endif /* !MBEDTLS_GCM_ALT */ + +#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_CCM_GCM_CAN_AES) +/* + * AES-GCM test vectors from: + * + * http://csrc.nist.gov/groups/STM/cavp/documents/mac/gcmtestvectors.zip + */ +#define MAX_TESTS 6 + +static const int key_index_test_data[MAX_TESTS] = +{ 0, 0, 1, 1, 1, 1 }; + +static const unsigned char key_test_data[][32] = +{ + { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, + { 0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, + 0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08, + 0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c, + 0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08 }, +}; + +static const size_t iv_len_test_data[MAX_TESTS] = +{ 12, 12, 12, 12, 8, 60 }; + +static const int iv_index_test_data[MAX_TESTS] = +{ 0, 0, 1, 1, 1, 2 }; + +static const unsigned char iv_test_data[][64] = +{ + { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00 }, + { 0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad, + 0xde, 0xca, 0xf8, 0x88 }, + { 0x93, 0x13, 0x22, 0x5d, 0xf8, 0x84, 0x06, 0xe5, + 0x55, 0x90, 0x9c, 0x5a, 0xff, 0x52, 0x69, 0xaa, + 0x6a, 0x7a, 0x95, 0x38, 0x53, 0x4f, 0x7d, 0xa1, + 0xe4, 0xc3, 0x03, 0xd2, 0xa3, 0x18, 0xa7, 0x28, + 0xc3, 0xc0, 0xc9, 0x51, 0x56, 0x80, 0x95, 0x39, + 0xfc, 0xf0, 0xe2, 0x42, 0x9a, 0x6b, 0x52, 0x54, + 0x16, 0xae, 0xdb, 0xf5, 0xa0, 0xde, 0x6a, 0x57, + 0xa6, 0x37, 0xb3, 0x9b }, +}; + +static const size_t add_len_test_data[MAX_TESTS] = +{ 0, 0, 0, 20, 20, 20 }; + +static const int add_index_test_data[MAX_TESTS] = +{ 0, 0, 0, 1, 1, 1 }; + +static const unsigned char additional_test_data[][64] = +{ + { 0x00 }, + { 0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, + 0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef, + 0xab, 0xad, 0xda, 0xd2 }, +}; + +static const size_t pt_len_test_data[MAX_TESTS] = +{ 0, 16, 64, 60, 60, 60 }; + +static const int pt_index_test_data[MAX_TESTS] = +{ 0, 0, 1, 1, 1, 1 }; + +static const unsigned char pt_test_data[][64] = +{ + { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, + { 0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5, + 0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a, + 0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda, + 0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72, + 0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53, + 0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25, + 0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57, + 0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2, 0x55 }, +}; + +static const unsigned char ct_test_data[][64] = +{ + { 0x00 }, + { 0x03, 0x88, 0xda, 0xce, 0x60, 0xb6, 0xa3, 0x92, + 0xf3, 0x28, 0xc2, 0xb9, 0x71, 0xb2, 0xfe, 0x78 }, + { 0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24, + 0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c, + 0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0, + 0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e, + 0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c, + 0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05, + 0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97, + 0x3d, 0x58, 0xe0, 0x91, 0x47, 0x3f, 0x59, 0x85 }, + { 0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24, + 0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c, + 0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0, + 0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e, + 0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c, + 0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05, + 0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97, + 0x3d, 0x58, 0xe0, 0x91 }, + { 0x61, 0x35, 0x3b, 0x4c, 0x28, 0x06, 0x93, 0x4a, + 0x77, 0x7f, 0xf5, 0x1f, 0xa2, 0x2a, 0x47, 0x55, + 0x69, 0x9b, 0x2a, 0x71, 0x4f, 0xcd, 0xc6, 0xf8, + 0x37, 0x66, 0xe5, 0xf9, 0x7b, 0x6c, 0x74, 0x23, + 0x73, 0x80, 0x69, 0x00, 0xe4, 0x9f, 0x24, 0xb2, + 0x2b, 0x09, 0x75, 0x44, 0xd4, 0x89, 0x6b, 0x42, + 0x49, 0x89, 0xb5, 0xe1, 0xeb, 0xac, 0x0f, 0x07, + 0xc2, 0x3f, 0x45, 0x98 }, + { 0x8c, 0xe2, 0x49, 0x98, 0x62, 0x56, 0x15, 0xb6, + 0x03, 0xa0, 0x33, 0xac, 0xa1, 0x3f, 0xb8, 0x94, + 0xbe, 0x91, 0x12, 0xa5, 0xc3, 0xa2, 0x11, 0xa8, + 0xba, 0x26, 0x2a, 0x3c, 0xca, 0x7e, 0x2c, 0xa7, + 0x01, 0xe4, 0xa9, 0xa4, 0xfb, 0xa4, 0x3c, 0x90, + 0xcc, 0xdc, 0xb2, 0x81, 0xd4, 0x8c, 0x7c, 0x6f, + 0xd6, 0x28, 0x75, 0xd2, 0xac, 0xa4, 0x17, 0x03, + 0x4c, 0x34, 0xae, 0xe5 }, +#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH) + { 0x00 }, + { 0x98, 0xe7, 0x24, 0x7c, 0x07, 0xf0, 0xfe, 0x41, + 0x1c, 0x26, 0x7e, 0x43, 0x84, 0xb0, 0xf6, 0x00 }, + { 0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41, + 0xeb, 0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57, + 0x85, 0x9e, 0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84, + 0x62, 0x85, 0x93, 0xb4, 0x0c, 0xa1, 0xe1, 0x9c, + 0x7d, 0x77, 0x3d, 0x00, 0xc1, 0x44, 0xc5, 0x25, + 0xac, 0x61, 0x9d, 0x18, 0xc8, 0x4a, 0x3f, 0x47, + 0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3, 0x24, 0xd9, + 0xcc, 0xda, 0x27, 0x10, 0xac, 0xad, 0xe2, 0x56 }, + { 0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41, + 0xeb, 0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57, + 0x85, 0x9e, 0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84, + 0x62, 0x85, 0x93, 0xb4, 0x0c, 0xa1, 0xe1, 0x9c, + 0x7d, 0x77, 0x3d, 0x00, 0xc1, 0x44, 0xc5, 0x25, + 0xac, 0x61, 0x9d, 0x18, 0xc8, 0x4a, 0x3f, 0x47, + 0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3, 0x24, 0xd9, + 0xcc, 0xda, 0x27, 0x10 }, + { 0x0f, 0x10, 0xf5, 0x99, 0xae, 0x14, 0xa1, 0x54, + 0xed, 0x24, 0xb3, 0x6e, 0x25, 0x32, 0x4d, 0xb8, + 0xc5, 0x66, 0x63, 0x2e, 0xf2, 0xbb, 0xb3, 0x4f, + 0x83, 0x47, 0x28, 0x0f, 0xc4, 0x50, 0x70, 0x57, + 0xfd, 0xdc, 0x29, 0xdf, 0x9a, 0x47, 0x1f, 0x75, + 0xc6, 0x65, 0x41, 0xd4, 0xd4, 0xda, 0xd1, 0xc9, + 0xe9, 0x3a, 0x19, 0xa5, 0x8e, 0x8b, 0x47, 0x3f, + 0xa0, 0xf0, 0x62, 0xf7 }, + { 0xd2, 0x7e, 0x88, 0x68, 0x1c, 0xe3, 0x24, 0x3c, + 0x48, 0x30, 0x16, 0x5a, 0x8f, 0xdc, 0xf9, 0xff, + 0x1d, 0xe9, 0xa1, 0xd8, 0xe6, 0xb4, 0x47, 0xef, + 0x6e, 0xf7, 0xb7, 0x98, 0x28, 0x66, 0x6e, 0x45, + 0x81, 0xe7, 0x90, 0x12, 0xaf, 0x34, 0xdd, 0xd9, + 0xe2, 0xf0, 0x37, 0x58, 0x9b, 0x29, 0x2d, 0xb3, + 0xe6, 0x7c, 0x03, 0x67, 0x45, 0xfa, 0x22, 0xe7, + 0xe9, 0xb7, 0x37, 0x3b }, + { 0x00 }, + { 0xce, 0xa7, 0x40, 0x3d, 0x4d, 0x60, 0x6b, 0x6e, + 0x07, 0x4e, 0xc5, 0xd3, 0xba, 0xf3, 0x9d, 0x18 }, + { 0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07, + 0xf4, 0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d, + 0x64, 0x3a, 0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9, + 0x75, 0x98, 0xa2, 0xbd, 0x25, 0x55, 0xd1, 0xaa, + 0x8c, 0xb0, 0x8e, 0x48, 0x59, 0x0d, 0xbb, 0x3d, + 0xa7, 0xb0, 0x8b, 0x10, 0x56, 0x82, 0x88, 0x38, + 0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba, 0x7a, 0x0a, + 0xbc, 0xc9, 0xf6, 0x62, 0x89, 0x80, 0x15, 0xad }, + { 0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07, + 0xf4, 0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d, + 0x64, 0x3a, 0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9, + 0x75, 0x98, 0xa2, 0xbd, 0x25, 0x55, 0xd1, 0xaa, + 0x8c, 0xb0, 0x8e, 0x48, 0x59, 0x0d, 0xbb, 0x3d, + 0xa7, 0xb0, 0x8b, 0x10, 0x56, 0x82, 0x88, 0x38, + 0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba, 0x7a, 0x0a, + 0xbc, 0xc9, 0xf6, 0x62 }, + { 0xc3, 0x76, 0x2d, 0xf1, 0xca, 0x78, 0x7d, 0x32, + 0xae, 0x47, 0xc1, 0x3b, 0xf1, 0x98, 0x44, 0xcb, + 0xaf, 0x1a, 0xe1, 0x4d, 0x0b, 0x97, 0x6a, 0xfa, + 0xc5, 0x2f, 0xf7, 0xd7, 0x9b, 0xba, 0x9d, 0xe0, + 0xfe, 0xb5, 0x82, 0xd3, 0x39, 0x34, 0xa4, 0xf0, + 0x95, 0x4c, 0xc2, 0x36, 0x3b, 0xc7, 0x3f, 0x78, + 0x62, 0xac, 0x43, 0x0e, 0x64, 0xab, 0xe4, 0x99, + 0xf4, 0x7c, 0x9b, 0x1f }, + { 0x5a, 0x8d, 0xef, 0x2f, 0x0c, 0x9e, 0x53, 0xf1, + 0xf7, 0x5d, 0x78, 0x53, 0x65, 0x9e, 0x2a, 0x20, + 0xee, 0xb2, 0xb2, 0x2a, 0xaf, 0xde, 0x64, 0x19, + 0xa0, 0x58, 0xab, 0x4f, 0x6f, 0x74, 0x6b, 0xf4, + 0x0f, 0xc0, 0xc3, 0xb7, 0x80, 0xf2, 0x44, 0x45, + 0x2d, 0xa3, 0xeb, 0xf1, 0xc5, 0xd8, 0x2c, 0xde, + 0xa2, 0x41, 0x89, 0x97, 0x20, 0x0e, 0xf8, 0x2e, + 0x44, 0xae, 0x7e, 0x3f }, +#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */ +}; + +static const unsigned char tag_test_data[][16] = +{ + { 0x58, 0xe2, 0xfc, 0xce, 0xfa, 0x7e, 0x30, 0x61, + 0x36, 0x7f, 0x1d, 0x57, 0xa4, 0xe7, 0x45, 0x5a }, + { 0xab, 0x6e, 0x47, 0xd4, 0x2c, 0xec, 0x13, 0xbd, + 0xf5, 0x3a, 0x67, 0xb2, 0x12, 0x57, 0xbd, 0xdf }, + { 0x4d, 0x5c, 0x2a, 0xf3, 0x27, 0xcd, 0x64, 0xa6, + 0x2c, 0xf3, 0x5a, 0xbd, 0x2b, 0xa6, 0xfa, 0xb4 }, + { 0x5b, 0xc9, 0x4f, 0xbc, 0x32, 0x21, 0xa5, 0xdb, + 0x94, 0xfa, 0xe9, 0x5a, 0xe7, 0x12, 0x1a, 0x47 }, + { 0x36, 0x12, 0xd2, 0xe7, 0x9e, 0x3b, 0x07, 0x85, + 0x56, 0x1b, 0xe1, 0x4a, 0xac, 0xa2, 0xfc, 0xcb }, + { 0x61, 0x9c, 0xc5, 0xae, 0xff, 0xfe, 0x0b, 0xfa, + 0x46, 0x2a, 0xf4, 0x3c, 0x16, 0x99, 0xd0, 0x50 }, +#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH) + { 0xcd, 0x33, 0xb2, 0x8a, 0xc7, 0x73, 0xf7, 0x4b, + 0xa0, 0x0e, 0xd1, 0xf3, 0x12, 0x57, 0x24, 0x35 }, + { 0x2f, 0xf5, 0x8d, 0x80, 0x03, 0x39, 0x27, 0xab, + 0x8e, 0xf4, 0xd4, 0x58, 0x75, 0x14, 0xf0, 0xfb }, + { 0x99, 0x24, 0xa7, 0xc8, 0x58, 0x73, 0x36, 0xbf, + 0xb1, 0x18, 0x02, 0x4d, 0xb8, 0x67, 0x4a, 0x14 }, + { 0x25, 0x19, 0x49, 0x8e, 0x80, 0xf1, 0x47, 0x8f, + 0x37, 0xba, 0x55, 0xbd, 0x6d, 0x27, 0x61, 0x8c }, + { 0x65, 0xdc, 0xc5, 0x7f, 0xcf, 0x62, 0x3a, 0x24, + 0x09, 0x4f, 0xcc, 0xa4, 0x0d, 0x35, 0x33, 0xf8 }, + { 0xdc, 0xf5, 0x66, 0xff, 0x29, 0x1c, 0x25, 0xbb, + 0xb8, 0x56, 0x8f, 0xc3, 0xd3, 0x76, 0xa6, 0xd9 }, + { 0x53, 0x0f, 0x8a, 0xfb, 0xc7, 0x45, 0x36, 0xb9, + 0xa9, 0x63, 0xb4, 0xf1, 0xc4, 0xcb, 0x73, 0x8b }, + { 0xd0, 0xd1, 0xc8, 0xa7, 0x99, 0x99, 0x6b, 0xf0, + 0x26, 0x5b, 0x98, 0xb5, 0xd4, 0x8a, 0xb9, 0x19 }, + { 0xb0, 0x94, 0xda, 0xc5, 0xd9, 0x34, 0x71, 0xbd, + 0xec, 0x1a, 0x50, 0x22, 0x70, 0xe3, 0xcc, 0x6c }, + { 0x76, 0xfc, 0x6e, 0xce, 0x0f, 0x4e, 0x17, 0x68, + 0xcd, 0xdf, 0x88, 0x53, 0xbb, 0x2d, 0x55, 0x1b }, + { 0x3a, 0x33, 0x7d, 0xbf, 0x46, 0xa7, 0x92, 0xc4, + 0x5e, 0x45, 0x49, 0x13, 0xfe, 0x2e, 0xa8, 0xf2 }, + { 0xa4, 0x4a, 0x82, 0x66, 0xee, 0x1c, 0x8e, 0xb0, + 0xc8, 0xb5, 0xd4, 0xcf, 0x5a, 0xe9, 0xf1, 0x9a }, +#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */ +}; + +int mbedtls_gcm_self_test(int verbose) +{ + mbedtls_gcm_context ctx; + unsigned char buf[64]; + unsigned char tag_buf[16]; + int i, j, ret; + mbedtls_cipher_id_t cipher = MBEDTLS_CIPHER_ID_AES; + size_t olen; + + if (verbose != 0) { +#if defined(MBEDTLS_GCM_ALT) + mbedtls_printf(" GCM note: alternative implementation.\n"); +#else /* MBEDTLS_GCM_ALT */ +#if defined(MBEDTLS_AESNI_HAVE_CODE) + if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) { + mbedtls_printf(" GCM note: using AESNI.\n"); + } else +#endif + +#if defined(MBEDTLS_AESCE_HAVE_CODE) + if (MBEDTLS_AESCE_HAS_SUPPORT()) { + mbedtls_printf(" GCM note: using AESCE.\n"); + } else +#endif + + mbedtls_printf(" GCM note: built-in implementation.\n"); +#endif /* MBEDTLS_GCM_ALT */ + } + + static const int loop_limit = + (sizeof(ct_test_data) / sizeof(*ct_test_data)) / MAX_TESTS; + + for (j = 0; j < loop_limit; j++) { + int key_len = 128 + 64 * j; + + for (i = 0; i < MAX_TESTS; i++) { + if (verbose != 0) { + mbedtls_printf(" AES-GCM-%3d #%d (%s): ", + key_len, i, "enc"); + } + + mbedtls_gcm_init(&ctx); + + ret = mbedtls_gcm_setkey(&ctx, cipher, + key_test_data[key_index_test_data[i]], + key_len); + /* + * AES-192 is an optional feature that may be unavailable when + * there is an alternative underlying implementation i.e. when + * MBEDTLS_AES_ALT is defined. + */ + if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED && key_len == 192) { + mbedtls_printf("skipped\n"); + break; + } else if (ret != 0) { + goto exit; + } + + ret = mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_GCM_ENCRYPT, + pt_len_test_data[i], + iv_test_data[iv_index_test_data[i]], + iv_len_test_data[i], + additional_test_data[add_index_test_data[i]], + add_len_test_data[i], + pt_test_data[pt_index_test_data[i]], + buf, 16, tag_buf); +#if defined(MBEDTLS_GCM_ALT) + /* Allow alternative implementations to only support 12-byte nonces. */ + if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED && + iv_len_test_data[i] != 12) { + mbedtls_printf("skipped\n"); + break; + } +#endif /* defined(MBEDTLS_GCM_ALT) */ + if (ret != 0) { + goto exit; + } + + if (memcmp(buf, ct_test_data[j * 6 + i], + pt_len_test_data[i]) != 0 || + memcmp(tag_buf, tag_test_data[j * 6 + i], 16) != 0) { + ret = 1; + goto exit; + } + + mbedtls_gcm_free(&ctx); + + if (verbose != 0) { + mbedtls_printf("passed\n"); + } + + mbedtls_gcm_init(&ctx); + + if (verbose != 0) { + mbedtls_printf(" AES-GCM-%3d #%d (%s): ", + key_len, i, "dec"); + } + + ret = mbedtls_gcm_setkey(&ctx, cipher, + key_test_data[key_index_test_data[i]], + key_len); + if (ret != 0) { + goto exit; + } + + ret = mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_GCM_DECRYPT, + pt_len_test_data[i], + iv_test_data[iv_index_test_data[i]], + iv_len_test_data[i], + additional_test_data[add_index_test_data[i]], + add_len_test_data[i], + ct_test_data[j * 6 + i], buf, 16, tag_buf); + + if (ret != 0) { + goto exit; + } + + if (memcmp(buf, pt_test_data[pt_index_test_data[i]], + pt_len_test_data[i]) != 0 || + memcmp(tag_buf, tag_test_data[j * 6 + i], 16) != 0) { + ret = 1; + goto exit; + } + + mbedtls_gcm_free(&ctx); + + if (verbose != 0) { + mbedtls_printf("passed\n"); + } + + mbedtls_gcm_init(&ctx); + + if (verbose != 0) { + mbedtls_printf(" AES-GCM-%3d #%d split (%s): ", + key_len, i, "enc"); + } + + ret = mbedtls_gcm_setkey(&ctx, cipher, + key_test_data[key_index_test_data[i]], + key_len); + if (ret != 0) { + goto exit; + } + + ret = mbedtls_gcm_starts(&ctx, MBEDTLS_GCM_ENCRYPT, + iv_test_data[iv_index_test_data[i]], + iv_len_test_data[i]); + if (ret != 0) { + goto exit; + } + + ret = mbedtls_gcm_update_ad(&ctx, + additional_test_data[add_index_test_data[i]], + add_len_test_data[i]); + if (ret != 0) { + goto exit; + } + + if (pt_len_test_data[i] > 32) { + size_t rest_len = pt_len_test_data[i] - 32; + ret = mbedtls_gcm_update(&ctx, + pt_test_data[pt_index_test_data[i]], + 32, + buf, sizeof(buf), &olen); + if (ret != 0) { + goto exit; + } + if (olen != 32) { + goto exit; + } + + ret = mbedtls_gcm_update(&ctx, + pt_test_data[pt_index_test_data[i]] + 32, + rest_len, + buf + 32, sizeof(buf) - 32, &olen); + if (ret != 0) { + goto exit; + } + if (olen != rest_len) { + goto exit; + } + } else { + ret = mbedtls_gcm_update(&ctx, + pt_test_data[pt_index_test_data[i]], + pt_len_test_data[i], + buf, sizeof(buf), &olen); + if (ret != 0) { + goto exit; + } + if (olen != pt_len_test_data[i]) { + goto exit; + } + } + + ret = mbedtls_gcm_finish(&ctx, NULL, 0, &olen, tag_buf, 16); + if (ret != 0) { + goto exit; + } + + if (memcmp(buf, ct_test_data[j * 6 + i], + pt_len_test_data[i]) != 0 || + memcmp(tag_buf, tag_test_data[j * 6 + i], 16) != 0) { + ret = 1; + goto exit; + } + + mbedtls_gcm_free(&ctx); + + if (verbose != 0) { + mbedtls_printf("passed\n"); + } + + mbedtls_gcm_init(&ctx); + + if (verbose != 0) { + mbedtls_printf(" AES-GCM-%3d #%d split (%s): ", + key_len, i, "dec"); + } + + ret = mbedtls_gcm_setkey(&ctx, cipher, + key_test_data[key_index_test_data[i]], + key_len); + if (ret != 0) { + goto exit; + } + + ret = mbedtls_gcm_starts(&ctx, MBEDTLS_GCM_DECRYPT, + iv_test_data[iv_index_test_data[i]], + iv_len_test_data[i]); + if (ret != 0) { + goto exit; + } + ret = mbedtls_gcm_update_ad(&ctx, + additional_test_data[add_index_test_data[i]], + add_len_test_data[i]); + if (ret != 0) { + goto exit; + } + + if (pt_len_test_data[i] > 32) { + size_t rest_len = pt_len_test_data[i] - 32; + ret = mbedtls_gcm_update(&ctx, + ct_test_data[j * 6 + i], 32, + buf, sizeof(buf), &olen); + if (ret != 0) { + goto exit; + } + if (olen != 32) { + goto exit; + } + + ret = mbedtls_gcm_update(&ctx, + ct_test_data[j * 6 + i] + 32, + rest_len, + buf + 32, sizeof(buf) - 32, &olen); + if (ret != 0) { + goto exit; + } + if (olen != rest_len) { + goto exit; + } + } else { + ret = mbedtls_gcm_update(&ctx, + ct_test_data[j * 6 + i], + pt_len_test_data[i], + buf, sizeof(buf), &olen); + if (ret != 0) { + goto exit; + } + if (olen != pt_len_test_data[i]) { + goto exit; + } + } + + ret = mbedtls_gcm_finish(&ctx, NULL, 0, &olen, tag_buf, 16); + if (ret != 0) { + goto exit; + } + + if (memcmp(buf, pt_test_data[pt_index_test_data[i]], + pt_len_test_data[i]) != 0 || + memcmp(tag_buf, tag_test_data[j * 6 + i], 16) != 0) { + ret = 1; + goto exit; + } + + mbedtls_gcm_free(&ctx); + + if (verbose != 0) { + mbedtls_printf("passed\n"); + } + } + } + + if (verbose != 0) { + mbedtls_printf("\n"); + } + + ret = 0; + +exit: + if (ret != 0) { + if (verbose != 0) { + mbedtls_printf("failed\n"); + } + mbedtls_gcm_free(&ctx); + } + + return ret; +} + +#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */ + +#endif /* MBEDTLS_GCM_C */ |