mirror of
https://github.com/yuzu-emu/mbedtls.git
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Merge pull request #3973 from stroebeljc/development
Fixed seed variable concatenation pointer.
This commit is contained in:
Manuel Pégourié-Gonnard
GitHub
commit
75fdd0640f
10
ChangeLog.d/issue3819.txt
Normal file
10
ChangeLog.d/issue3819.txt
Normal file
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@ -0,0 +1,10 @@
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Security
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* Fix a security reduction in CTR_DRBG when the initial seeding obtained a
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nonce from entropy. Applications were affected if they called
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mbedtls_ctr_drbg_set_nonce_len(), if they called
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mbedtls_ctr_drbg_set_entropy_len() with a size that was 3/2 times the key
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length, or when the entropy module uses SHA-256 and CTR_DRBG uses AES-256.
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In such cases, a random nonce was necessary to achieve the advertised
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security strength, but the code incorrectly used a constant instead of
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entropy from the nonce.
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Found by John Stroebel in #3819 and fixed in #3973.
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@ -394,7 +394,7 @@ static int mbedtls_ctr_drbg_reseed_internal( mbedtls_ctr_drbg_context *ctx,
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/* Gather entropy for a nonce if requested. */
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if( nonce_len != 0 )
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{
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if( 0 != ctx->f_entropy( ctx->p_entropy, seed, nonce_len ) )
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if( 0 != ctx->f_entropy( ctx->p_entropy, seed + seedlen, nonce_len ) )
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{
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return( MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED );
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}
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@ -684,54 +684,134 @@ exit:
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#if defined(MBEDTLS_SELF_TEST)
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static const unsigned char entropy_source_pr[96] =
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{ 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16,
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0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02,
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0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b,
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0x6e, 0xa6, 0x62, 0x52, 0x6d, 0x51, 0xb1, 0xcb,
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0x58, 0x3b, 0xfa, 0xd5, 0x37, 0x5f, 0xfb, 0xc9,
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0xff, 0x46, 0xd2, 0x19, 0xc7, 0x22, 0x3e, 0x95,
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0x45, 0x9d, 0x82, 0xe1, 0xe7, 0x22, 0x9f, 0x63,
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0x31, 0x69, 0xd2, 0x6b, 0x57, 0x47, 0x4f, 0xa3,
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0x37, 0xc9, 0x98, 0x1c, 0x0b, 0xfb, 0x91, 0x31,
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0x4d, 0x55, 0xb9, 0xe9, 0x1c, 0x5a, 0x5e, 0xe4,
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0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56,
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0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 };
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static const unsigned char entropy_source_nopr[64] =
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{ 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14,
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0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe,
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0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d,
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0x03, 0x21, 0x7c, 0x68, 0xd8, 0x03, 0x38, 0x20,
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0xf9, 0xe6, 0x5e, 0x04, 0xd8, 0x56, 0xf3, 0xa9,
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0xc4, 0x4a, 0x4c, 0xbd, 0xc1, 0xd0, 0x08, 0x46,
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0xf5, 0x98, 0x3d, 0x77, 0x1c, 0x1b, 0x13, 0x7e,
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0x4e, 0x0f, 0x9d, 0x8e, 0xf4, 0x09, 0xf9, 0x2e };
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static const unsigned char nonce_pers_pr[16] =
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{ 0xd2, 0x54, 0xfc, 0xff, 0x02, 0x1e, 0x69, 0xd2,
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0x29, 0xc9, 0xcf, 0xad, 0x85, 0xfa, 0x48, 0x6c };
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static const unsigned char nonce_pers_nopr[16] =
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{ 0x1b, 0x54, 0xb8, 0xff, 0x06, 0x42, 0xbf, 0xf5,
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0x21, 0xf1, 0x5c, 0x1c, 0x0b, 0x66, 0x5f, 0x3f };
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/* The CTR_DRBG NIST test vectors used here are available at
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* https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm-Validation-Program/documents/drbg/drbgtestvectors.zip
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*
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* The parameters used to derive the test data are:
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*
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* [AES-128 use df]
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* [PredictionResistance = True/False]
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* [EntropyInputLen = 128]
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* [NonceLen = 64]
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* [PersonalizationStringLen = 128]
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* [AdditionalInputLen = 0]
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* [ReturnedBitsLen = 512]
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*
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* [AES-256 use df]
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* [PredictionResistance = True/False]
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* [EntropyInputLen = 256]
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* [NonceLen = 128]
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* [PersonalizationStringLen = 256]
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* [AdditionalInputLen = 0]
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* [ReturnedBitsLen = 512]
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*
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*/
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#if defined(MBEDTLS_CTR_DRBG_USE_128_BIT_KEY)
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static const unsigned char result_pr[16] =
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{ 0x95, 0x3c, 0xa5, 0xbd, 0x44, 0x1, 0x34, 0xb7,
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0x13, 0x58, 0x3e, 0x6a, 0x6c, 0x7e, 0x88, 0x8a };
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static const unsigned char entropy_source_pr[] =
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{ 0x04, 0xd9, 0x49, 0xa6, 0xdc, 0xe8, 0x6e, 0xbb,
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0xf1, 0x08, 0x77, 0x2b, 0x9e, 0x08, 0xca, 0x92,
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0x65, 0x16, 0xda, 0x99, 0xa2, 0x59, 0xf3, 0xe8,
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0x38, 0x7e, 0x3f, 0x6b, 0x51, 0x70, 0x7b, 0x20,
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0xec, 0x53, 0xd0, 0x66, 0xc3, 0x0f, 0xe3, 0xb0,
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0xe0, 0x86, 0xa6, 0xaa, 0x5f, 0x72, 0x2f, 0xad,
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0xf7, 0xef, 0x06, 0xb8, 0xd6, 0x9c, 0x9d, 0xe8 };
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static const unsigned char result_nopr[16] =
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{ 0x6c, 0x25, 0x27, 0x95, 0xa3, 0x62, 0xd6, 0xdb,
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0x90, 0xfd, 0x69, 0xb5, 0x42, 0x9, 0x4b, 0x84 };
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static const unsigned char entropy_source_nopr[] =
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{ 0x07, 0x0d, 0x59, 0x63, 0x98, 0x73, 0xa5, 0x45,
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0x27, 0x38, 0x22, 0x7b, 0x76, 0x85, 0xd1, 0xa9,
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0x74, 0x18, 0x1f, 0x3c, 0x22, 0xf6, 0x49, 0x20,
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0x4a, 0x47, 0xc2, 0xf3, 0x85, 0x16, 0xb4, 0x6f,
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0x00, 0x2e, 0x71, 0xda, 0xed, 0x16, 0x9b, 0x5c };
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static const unsigned char pers_pr[] =
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{ 0xbf, 0xa4, 0x9a, 0x8f, 0x7b, 0xd8, 0xb1, 0x7a,
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0x9d, 0xfa, 0x45, 0xed, 0x21, 0x52, 0xb3, 0xad };
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static const unsigned char pers_nopr[] =
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{ 0x4e, 0x61, 0x79, 0xd4, 0xc2, 0x72, 0xa1, 0x4c,
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0xf1, 0x3d, 0xf6, 0x5e, 0xa3, 0xa6, 0xe5, 0x0f };
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static const unsigned char result_pr[] =
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{ 0xc9, 0x0a, 0xaf, 0x85, 0x89, 0x71, 0x44, 0x66,
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0x4f, 0x25, 0x0b, 0x2b, 0xde, 0xd8, 0xfa, 0xff,
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0x52, 0x5a, 0x1b, 0x32, 0x5e, 0x41, 0x7a, 0x10,
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0x1f, 0xef, 0x1e, 0x62, 0x23, 0xe9, 0x20, 0x30,
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0xc9, 0x0d, 0xad, 0x69, 0xb4, 0x9c, 0x5b, 0xf4,
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0x87, 0x42, 0xd5, 0xae, 0x5e, 0x5e, 0x43, 0xcc,
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0xd9, 0xfd, 0x0b, 0x93, 0x4a, 0xe3, 0xd4, 0x06,
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0x37, 0x36, 0x0f, 0x3f, 0x72, 0x82, 0x0c, 0xcf };
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static const unsigned char result_nopr[] =
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{ 0x31, 0xc9, 0x91, 0x09, 0xf8, 0xc5, 0x10, 0x13,
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0x3c, 0xd3, 0x96, 0xf9, 0xbc, 0x2c, 0x12, 0xc0,
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0x7c, 0xc1, 0x61, 0x5f, 0xa3, 0x09, 0x99, 0xaf,
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0xd7, 0xf2, 0x36, 0xfd, 0x40, 0x1a, 0x8b, 0xf2,
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0x33, 0x38, 0xee, 0x1d, 0x03, 0x5f, 0x83, 0xb7,
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0xa2, 0x53, 0xdc, 0xee, 0x18, 0xfc, 0xa7, 0xf2,
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0xee, 0x96, 0xc6, 0xc2, 0xcd, 0x0c, 0xff, 0x02,
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0x76, 0x70, 0x69, 0xaa, 0x69, 0xd1, 0x3b, 0xe8 };
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#else /* MBEDTLS_CTR_DRBG_USE_128_BIT_KEY */
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static const unsigned char result_pr[16] =
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{ 0x34, 0x01, 0x16, 0x56, 0xb4, 0x29, 0x00, 0x8f,
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0x35, 0x63, 0xec, 0xb5, 0xf2, 0x59, 0x07, 0x23 };
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static const unsigned char result_nopr[16] =
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{ 0xa0, 0x54, 0x30, 0x3d, 0x8a, 0x7e, 0xa9, 0x88,
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0x9d, 0x90, 0x3e, 0x07, 0x7c, 0x6f, 0x21, 0x8f };
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static const unsigned char entropy_source_pr[] =
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{ 0xca, 0x58, 0xfd, 0xf2, 0xb9, 0x77, 0xcb, 0x49,
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0xd4, 0xe0, 0x5b, 0xe2, 0x39, 0x50, 0xd9, 0x8a,
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0x6a, 0xb3, 0xc5, 0x2f, 0xdf, 0x74, 0xd5, 0x85,
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0x8f, 0xd1, 0xba, 0x64, 0x54, 0x7b, 0xdb, 0x1e,
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0xc5, 0xea, 0x24, 0xc0, 0xfa, 0x0c, 0x90, 0x15,
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0x09, 0x20, 0x92, 0x42, 0x32, 0x36, 0x45, 0x45,
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0x7d, 0x20, 0x76, 0x6b, 0xcf, 0xa2, 0x15, 0xc8,
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0x2f, 0x9f, 0xbc, 0x88, 0x3f, 0x80, 0xd1, 0x2c,
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0xb7, 0x16, 0xd1, 0x80, 0x9e, 0xe1, 0xc9, 0xb3,
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0x88, 0x1b, 0x21, 0x45, 0xef, 0xa1, 0x7f, 0xce,
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0xc8, 0x92, 0x35, 0x55, 0x2a, 0xd9, 0x1d, 0x8e,
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0x12, 0x38, 0xac, 0x01, 0x4e, 0x38, 0x18, 0x76,
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0x9c, 0xf2, 0xb6, 0xd4, 0x13, 0xb6, 0x2c, 0x77,
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0xc0, 0xe7, 0xe6, 0x0c, 0x47, 0x44, 0x95, 0xbe };
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static const unsigned char entropy_source_nopr[] =
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{ 0x4c, 0xfb, 0x21, 0x86, 0x73, 0x34, 0x6d, 0x9d,
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0x50, 0xc9, 0x22, 0xe4, 0x9b, 0x0d, 0xfc, 0xd0,
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0x90, 0xad, 0xf0, 0x4f, 0x5c, 0x3b, 0xa4, 0x73,
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0x27, 0xdf, 0xcd, 0x6f, 0xa6, 0x3a, 0x78, 0x5c,
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0x01, 0x69, 0x62, 0xa7, 0xfd, 0x27, 0x87, 0xa2,
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0x4b, 0xf6, 0xbe, 0x47, 0xef, 0x37, 0x83, 0xf1,
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0xb7, 0xec, 0x46, 0x07, 0x23, 0x63, 0x83, 0x4a,
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0x1b, 0x01, 0x33, 0xf2, 0xc2, 0x38, 0x91, 0xdb,
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0x4f, 0x11, 0xa6, 0x86, 0x51, 0xf2, 0x3e, 0x3a,
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0x8b, 0x1f, 0xdc, 0x03, 0xb1, 0x92, 0xc7, 0xe7 };
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static const unsigned char pers_pr[] =
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{ 0x5a, 0x70, 0x95, 0xe9, 0x81, 0x40, 0x52, 0x33,
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0x91, 0x53, 0x7e, 0x75, 0xd6, 0x19, 0x9d, 0x1e,
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0xad, 0x0d, 0xc6, 0xa7, 0xde, 0x6c, 0x1f, 0xe0,
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0xea, 0x18, 0x33, 0xa8, 0x7e, 0x06, 0x20, 0xe9 };
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static const unsigned char pers_nopr[] =
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{ 0x88, 0xee, 0xb8, 0xe0, 0xe8, 0x3b, 0xf3, 0x29,
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0x4b, 0xda, 0xcd, 0x60, 0x99, 0xeb, 0xe4, 0xbf,
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0x55, 0xec, 0xd9, 0x11, 0x3f, 0x71, 0xe5, 0xeb,
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0xcb, 0x45, 0x75, 0xf3, 0xd6, 0xa6, 0x8a, 0x6b };
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static const unsigned char result_pr[] =
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{ 0xce, 0x2f, 0xdb, 0xb6, 0xd9, 0xb7, 0x39, 0x85,
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0x04, 0xc5, 0xc0, 0x42, 0xc2, 0x31, 0xc6, 0x1d,
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0x9b, 0x5a, 0x59, 0xf8, 0x7e, 0x0d, 0xcc, 0x62,
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0x7b, 0x65, 0x11, 0x55, 0x10, 0xeb, 0x9e, 0x3d,
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0xa4, 0xfb, 0x1c, 0x6a, 0x18, 0xc0, 0x74, 0xdb,
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0xdd, 0xe7, 0x02, 0x23, 0x63, 0x21, 0xd0, 0x39,
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0xf9, 0xa7, 0xc4, 0x52, 0x84, 0x3b, 0x49, 0x40,
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0x72, 0x2b, 0xb0, 0x6c, 0x9c, 0xdb, 0xc3, 0x43 };
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static const unsigned char result_nopr[] =
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{ 0xa5, 0x51, 0x80, 0xa1, 0x90, 0xbe, 0xf3, 0xad,
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0xaf, 0x28, 0xf6, 0xb7, 0x95, 0xe9, 0xf1, 0xf3,
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0xd6, 0xdf, 0xa1, 0xb2, 0x7d, 0xd0, 0x46, 0x7b,
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0x0c, 0x75, 0xf5, 0xfa, 0x93, 0x1e, 0x97, 0x14,
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0x75, 0xb2, 0x7c, 0xae, 0x03, 0xa2, 0x96, 0x54,
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0xe2, 0xf4, 0x09, 0x66, 0xea, 0x33, 0x64, 0x30,
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0x40, 0xd1, 0x40, 0x0f, 0xe6, 0x77, 0x87, 0x3a,
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0xf8, 0x09, 0x7c, 0x1f, 0xe9, 0xf0, 0x02, 0x98 };
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#endif /* MBEDTLS_CTR_DRBG_USE_128_BIT_KEY */
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static size_t test_offset;
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@ -751,13 +831,15 @@ static int ctr_drbg_self_test_entropy( void *data, unsigned char *buf,
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return( 1 ); \
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}
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#define SELF_TEST_OUPUT_DISCARD_LENGTH 64
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/*
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* Checkup routine
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*/
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int mbedtls_ctr_drbg_self_test( int verbose )
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{
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mbedtls_ctr_drbg_context ctx;
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unsigned char buf[16];
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unsigned char buf[ sizeof( result_pr ) ];
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mbedtls_ctr_drbg_init( &ctx );
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@ -768,16 +850,16 @@ int mbedtls_ctr_drbg_self_test( int verbose )
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mbedtls_printf( " CTR_DRBG (PR = TRUE) : " );
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test_offset = 0;
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mbedtls_ctr_drbg_set_entropy_len( &ctx, 32 );
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mbedtls_ctr_drbg_set_nonce_len( &ctx, 0 );
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mbedtls_ctr_drbg_set_entropy_len( &ctx, MBEDTLS_CTR_DRBG_KEYSIZE );
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mbedtls_ctr_drbg_set_nonce_len( &ctx, MBEDTLS_CTR_DRBG_KEYSIZE / 2 );
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CHK( mbedtls_ctr_drbg_seed( &ctx,
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ctr_drbg_self_test_entropy,
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(void *) entropy_source_pr,
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nonce_pers_pr, 16 ) );
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pers_pr, MBEDTLS_CTR_DRBG_KEYSIZE ) );
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mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
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CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
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CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
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CHK( memcmp( buf, result_pr, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
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CHK( mbedtls_ctr_drbg_random( &ctx, buf, SELF_TEST_OUPUT_DISCARD_LENGTH ) );
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CHK( mbedtls_ctr_drbg_random( &ctx, buf, sizeof( result_pr ) ) );
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CHK( memcmp( buf, result_pr, sizeof( result_pr ) ) );
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mbedtls_ctr_drbg_free( &ctx );
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@ -793,16 +875,16 @@ int mbedtls_ctr_drbg_self_test( int verbose )
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mbedtls_ctr_drbg_init( &ctx );
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test_offset = 0;
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mbedtls_ctr_drbg_set_entropy_len( &ctx, 32 );
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mbedtls_ctr_drbg_set_nonce_len( &ctx, 0 );
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mbedtls_ctr_drbg_set_entropy_len( &ctx, MBEDTLS_CTR_DRBG_KEYSIZE);
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mbedtls_ctr_drbg_set_nonce_len( &ctx, MBEDTLS_CTR_DRBG_KEYSIZE / 2 );
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CHK( mbedtls_ctr_drbg_seed( &ctx,
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ctr_drbg_self_test_entropy,
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(void *) entropy_source_nopr,
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nonce_pers_nopr, 16 ) );
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CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
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pers_nopr, MBEDTLS_CTR_DRBG_KEYSIZE ) );
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CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) );
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CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
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CHK( memcmp( buf, result_nopr, 16 ) );
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CHK( mbedtls_ctr_drbg_random( &ctx, buf, SELF_TEST_OUPUT_DISCARD_LENGTH ) );
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CHK( mbedtls_ctr_drbg_random( &ctx, buf, sizeof( result_nopr ) ) );
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CHK( memcmp( buf, result_nopr, sizeof( result_nopr ) ) );
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mbedtls_ctr_drbg_free( &ctx );
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