/* * NIST SP800-38D compliant GCM implementation * * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * 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_util.h" #include "mbedtls/error.h" #include #if defined(MBEDTLS_AESNI_C) #include "aesni.h" #endif #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C) #include "mbedtls/aes.h" #include "mbedtls/platform.h" #if !defined(MBEDTLS_PLATFORM_C) #include #define mbedtls_printf printf #endif /* MBEDTLS_PLATFORM_C */ #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */ #if !defined(MBEDTLS_GCM_ALT) /* Parameter validation macros */ #define GCM_VALIDATE_RET( cond ) \ MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_GCM_BAD_INPUT ) #define GCM_VALIDATE( cond ) \ MBEDTLS_INTERNAL_VALIDATE( cond ) /* * 32-bit integer manipulation macros (big endian) */ #ifndef GET_UINT32_BE #define GET_UINT32_BE(n,b,i) \ { \ (n) = ( (uint32_t) (b)[(i) ] << 24 ) \ | ( (uint32_t) (b)[(i) + 1] << 16 ) \ | ( (uint32_t) (b)[(i) + 2] << 8 ) \ | ( (uint32_t) (b)[(i) + 3] ); \ } #endif #ifndef PUT_UINT32_BE #define PUT_UINT32_BE(n,b,i) \ { \ (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \ (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \ (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \ (b)[(i) + 3] = (unsigned char) ( (n) ); \ } #endif /* * Initialize a context */ void mbedtls_gcm_init( mbedtls_gcm_context *ctx ) { GCM_VALIDATE( ctx != NULL ); memset( ctx, 0, sizeof( mbedtls_gcm_context ) ); } /* * 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 hi, lo; uint64_t vl, vh; unsigned char h[16]; size_t olen = 0; memset( h, 0, 16 ); if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, h, 16, h, &olen ) ) != 0 ) return( ret ); /* pack h as two 64-bits ints, big-endian */ GET_UINT32_BE( hi, h, 0 ); GET_UINT32_BE( lo, h, 4 ); vh = (uint64_t) hi << 32 | lo; GET_UINT32_BE( hi, h, 8 ); GET_UINT32_BE( lo, h, 12 ); vl = (uint64_t) hi << 32 | lo; /* 8 = 1000 corresponds to 1 in GF(2^128) */ ctx->HL[8] = vl; ctx->HH[8] = vh; #if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64) /* With CLMUL support, we need only h, not the rest of the table */ if( mbedtls_aesni_has_support( MBEDTLS_AESNI_CLMUL ) ) return( 0 ); #endif /* 0 corresponds to 0 in GF(2^128) */ ctx->HH[0] = 0; ctx->HL[0] = 0; for( i = 4; i > 0; i >>= 1 ) { uint32_t T = ( vl & 1 ) * 0xe1000000U; vl = ( vh << 63 ) | ( vl >> 1 ); vh = ( vh >> 1 ) ^ ( (uint64_t) T << 32); ctx->HL[i] = vl; ctx->HH[i] = vh; } for( i = 2; i <= 8; i *= 2 ) { uint64_t *HiL = ctx->HL + i, *HiH = ctx->HH + i; vh = *HiH; vl = *HiL; for( j = 1; j < i; j++ ) { HiH[j] = vh ^ ctx->HH[j]; HiL[j] = vl ^ ctx->HL[j]; } } 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; const mbedtls_cipher_info_t *cipher_info; GCM_VALIDATE_RET( ctx != NULL ); GCM_VALIDATE_RET( key != NULL ); GCM_VALIDATE_RET( keybits == 128 || keybits == 192 || keybits == 256 ); cipher_info = mbedtls_cipher_info_from_values( cipher, keybits, MBEDTLS_MODE_ECB ); if( cipher_info == NULL ) return( MBEDTLS_ERR_GCM_BAD_INPUT ); if( cipher_info->block_size != 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 ); } if( ( ret = gcm_gen_table( ctx ) ) != 0 ) return( ret ); return( 0 ); } /* * 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 uint64_t last4[16] = { 0x0000, 0x1c20, 0x3840, 0x2460, 0x7080, 0x6ca0, 0x48c0, 0x54e0, 0xe100, 0xfd20, 0xd940, 0xc560, 0x9180, 0x8da0, 0xa9c0, 0xb5e0 }; /* * 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] ) { int i = 0; unsigned char lo, hi, rem; uint64_t zh, zl; #if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64) if( mbedtls_aesni_has_support( MBEDTLS_AESNI_CLMUL ) ) { unsigned char h[16]; PUT_UINT32_BE( ctx->HH[8] >> 32, h, 0 ); PUT_UINT32_BE( ctx->HH[8], h, 4 ); PUT_UINT32_BE( ctx->HL[8] >> 32, h, 8 ); PUT_UINT32_BE( ctx->HL[8], h, 12 ); mbedtls_aesni_gcm_mult( output, x, h ); return; } #endif /* MBEDTLS_AESNI_C && MBEDTLS_HAVE_X86_64 */ lo = x[15] & 0xf; zh = ctx->HH[lo]; zl = ctx->HL[lo]; for( i = 15; i >= 0; i-- ) { lo = x[i] & 0xf; hi = ( x[i] >> 4 ) & 0xf; if( i != 15 ) { rem = (unsigned char) zl & 0xf; zl = ( zh << 60 ) | ( zl >> 4 ); zh = ( zh >> 4 ); zh ^= (uint64_t) last4[rem] << 48; zh ^= ctx->HH[lo]; zl ^= ctx->HL[lo]; } rem = (unsigned char) zl & 0xf; zl = ( zh << 60 ) | ( zl >> 4 ); zh = ( zh >> 4 ); zh ^= (uint64_t) last4[rem] << 48; zh ^= ctx->HH[hi]; zl ^= ctx->HL[hi]; } PUT_UINT32_BE( zh >> 32, output, 0 ); PUT_UINT32_BE( zh, output, 4 ); PUT_UINT32_BE( zl >> 32, output, 8 ); PUT_UINT32_BE( zl, output, 12 ); } 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]; size_t i; const unsigned char *p; size_t use_len, olen = 0; GCM_VALIDATE_RET( ctx != NULL ); GCM_VALIDATE_RET( iv != NULL ); /* 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 ); PUT_UINT32_BE( iv_len * 8, work_buf, 12 ); p = iv; while( iv_len > 0 ) { use_len = ( iv_len < 16 ) ? iv_len : 16; for( i = 0; i < use_len; i++ ) ctx->y[i] ^= p[i]; gcm_mult( ctx, ctx->y, ctx->y ); iv_len -= use_len; p += use_len; } for( i = 0; i < 16; i++ ) ctx->y[i] ^= work_buf[i]; gcm_mult( ctx, ctx->y, ctx->y ); } if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctx->y, 16, ctx->base_ectr, &olen ) ) != 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, i, offset; GCM_VALIDATE_RET( add_len == 0 || add != NULL ); /* IV is limited to 2^64 bits, so 2^61 bytes */ if( (uint64_t) 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; for( i = 0; i < use_len; i++ ) ctx->buf[i+offset] ^= p[i]; 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 ) { for( i = 0; i < 16; i++ ) ctx->buf[i] ^= p[i]; gcm_mult( ctx, ctx->buf, ctx->buf ); add_len -= 16; p += 16; } if( add_len > 0 ) { for( i = 0; i < add_len; i++ ) ctx->buf[i] ^= p[i]; } return( 0 ); } /* Increment the counter. */ static void gcm_incr( unsigned char y[16] ) { size_t i; for( i = 16; i > 12; i-- ) if( ++y[i - 1] != 0 ) break; } /* 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 ) { size_t i; size_t olen = 0; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctx->y, 16, ectr, &olen ) ) != 0 ) { mbedtls_platform_zeroize( ectr, 16 ); return( ret ); } for( i = 0; i < use_len; i++ ) { if( ctx->mode == MBEDTLS_GCM_DECRYPT ) ctx->buf[offset + i] ^= input[i]; output[i] = ectr[offset + i] ^ input[i]; if( ctx->mode == MBEDTLS_GCM_ENCRYPT ) ctx->buf[offset + i] ^= output[i]; } 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]; if( output_size < input_length ) return( MBEDTLS_ERR_GCM_BAD_INPUT ); GCM_VALIDATE_RET( output_length != NULL ); *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 ); GCM_VALIDATE_RET( ctx != NULL ); GCM_VALIDATE_RET( input != NULL ); GCM_VALIDATE_RET( output != NULL ); 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, unsigned char *tag, size_t tag_len ) { unsigned char work_buf[16]; size_t i; uint64_t orig_len; uint64_t orig_add_len; GCM_VALIDATE_RET( ctx != NULL ); GCM_VALIDATE_RET( tag != NULL ); /* We never pass any output in finish(). The output parameter exists only * for the sake of alternative implementations. */ (void) output; (void) output_size; 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 ); PUT_UINT32_BE( ( orig_add_len >> 32 ), work_buf, 0 ); PUT_UINT32_BE( ( orig_add_len ), work_buf, 4 ); PUT_UINT32_BE( ( orig_len >> 32 ), work_buf, 8 ); PUT_UINT32_BE( ( orig_len ), work_buf, 12 ); for( i = 0; i < 16; i++ ) ctx->buf[i] ^= work_buf[i]; gcm_mult( ctx, ctx->buf, ctx->buf ); for( i = 0; i < tag_len; i++ ) tag[i] ^= ctx->buf[i]; } 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; GCM_VALIDATE_RET( ctx != NULL ); GCM_VALIDATE_RET( iv != NULL ); GCM_VALIDATE_RET( add_len == 0 || add != NULL ); GCM_VALIDATE_RET( length == 0 || input != NULL ); GCM_VALIDATE_RET( length == 0 || output != NULL ); GCM_VALIDATE_RET( tag != NULL ); 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, 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]; size_t i; int diff; GCM_VALIDATE_RET( ctx != NULL ); GCM_VALIDATE_RET( iv != NULL ); GCM_VALIDATE_RET( add_len == 0 || add != NULL ); GCM_VALIDATE_RET( tag != NULL ); GCM_VALIDATE_RET( length == 0 || input != NULL ); GCM_VALIDATE_RET( length == 0 || output != NULL ); 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" */ for( diff = 0, i = 0; i < tag_len; i++ ) diff |= tag[i] ^ check_tag[i]; 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; mbedtls_cipher_free( &ctx->cipher_ctx ); mbedtls_platform_zeroize( ctx, sizeof( mbedtls_gcm_context ) ); } #endif /* !MBEDTLS_GCM_ALT */ #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C) /* * 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[MAX_TESTS][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[MAX_TESTS][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[MAX_TESTS][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[MAX_TESTS][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[MAX_TESTS * 3][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 }, { 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 }, }; static const unsigned char tag_test_data[MAX_TESTS * 3][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 }, { 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 }, }; 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; for( j = 0; j < 3; j++ ) { int key_len = 128 + 64 * j; for( i = 0; i < MAX_TESTS; i++ ) { mbedtls_gcm_init( &ctx ); if( verbose != 0 ) mbedtls_printf( " AES-GCM-%3d #%d (%s): ", key_len, i, "enc" ); 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, 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, 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 */