| /************************* sha224-256.c ************************/ |
| /***************** See RFC 6234 for details. *******************/ |
| /* Copyright (c) 2011 IETF Trust and the persons identified as */ |
| /* authors of the code. All rights reserved. */ |
| /* See sha.h for terms of use and redistribution. */ |
| |
| /* |
| * Description: |
| * This file implements the Secure Hash Algorithms SHA-224 and |
| * SHA-256 as defined in the U.S. National Institute of Standards |
| * and Technology Federal Information Processing Standards |
| * Publication (FIPS PUB) 180-3 published in October 2008 |
| * and formerly defined in its predecessors, FIPS PUB 180-1 |
| * and FIP PUB 180-2. |
| * |
| * A combined document showing all algorithms is available at |
| * http://csrc.nist.gov/publications/fips/ |
| * fips180-3/fips180-3_final.pdf |
| * |
| * The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit |
| * message digests for a given data stream. It should take about |
| * 2**n steps to find a message with the same digest as a given |
| * message and 2**(n/2) to find any two messages with the same |
| * digest, when n is the digest size in bits. Therefore, this |
| * algorithm can serve as a means of providing a |
| * "fingerprint" for a message. |
| * |
| * Portability Issues: |
| * SHA-224 and SHA-256 are defined in terms of 32-bit "words". |
| * This code uses <stdint.h> (included via "sha.h") to define 32- |
| * and 8-bit unsigned integer types. If your C compiler does not |
| * support 32-bit unsigned integers, this code is not |
| * appropriate. |
| * |
| * Caveats: |
| * SHA-224 and SHA-256 are designed to work with messages less |
| * than 2^64 bits long. This implementation uses SHA224/256Input() |
| * to hash the bits that are a multiple of the size of an 8-bit |
| * octet, and then optionally uses SHA224/256FinalBits() |
| * to hash the final few bits of the input. |
| */ |
| |
| #include "sha.h" |
| #include "sha-private.h" |
| |
| /* Define the SHA shift, rotate left, and rotate right macros */ |
| #define SHA256_SHR(bits,word) ((word) >> (bits)) |
| #define SHA256_ROTL(bits,word) \ |
| (((word) << (bits)) | ((word) >> (32-(bits)))) |
| #define SHA256_ROTR(bits,word) \ |
| (((word) >> (bits)) | ((word) << (32-(bits)))) |
| |
| /* Define the SHA SIGMA and sigma macros */ |
| #define SHA256_SIGMA0(word) \ |
| (SHA256_ROTR( 2,word) ^ SHA256_ROTR(13,word) ^ SHA256_ROTR(22,word)) |
| #define SHA256_SIGMA1(word) \ |
| (SHA256_ROTR( 6,word) ^ SHA256_ROTR(11,word) ^ SHA256_ROTR(25,word)) |
| #define SHA256_sigma0(word) \ |
| (SHA256_ROTR( 7,word) ^ SHA256_ROTR(18,word) ^ SHA256_SHR( 3,word)) |
| #define SHA256_sigma1(word) \ |
| (SHA256_ROTR(17,word) ^ SHA256_ROTR(19,word) ^ SHA256_SHR(10,word)) |
| |
| /* |
| * Add "length" to the length. |
| * Set Corrupted when overflow has occurred. |
| */ |
| /* addTemp commented out by Nokia, static variables are not thread-safe */ |
| /* static uint32_t addTemp; */ |
| /* 'M' appended to Macro name by Nokia */ |
| #define SHA224_256AddLengthM(context, length) \ |
| (addTemp = (context)->Length_Low, (context)->Corrupted = \ |
| (((context)->Length_Low += (length)) < addTemp) && \ |
| (++(context)->Length_High == 0) ? shaInputTooLong : \ |
| (context)->Corrupted ) |
| |
| /* Local Function Prototypes */ |
| static int SHA224_256Reset(SHA256Context *context, uint32_t *H0); |
| static void SHA224_256ProcessMessageBlock(SHA256Context *context); |
| static void SHA224_256Finalize(SHA256Context *context, |
| uint8_t Pad_Byte); |
| static void SHA224_256PadMessage(SHA256Context *context, |
| uint8_t Pad_Byte); |
| static int SHA224_256ResultN(SHA256Context *context, |
| uint8_t Message_Digest[ ], int HashSize); |
| |
| /* Initial Hash Values: FIPS 180-3 section 5.3.2 */ |
| static uint32_t SHA224_H0[SHA256HashSize/4] = { |
| 0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939, |
| 0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4 |
| }; |
| |
| /* Initial Hash Values: FIPS 180-3 section 5.3.3 */ |
| static uint32_t SHA256_H0[SHA256HashSize/4] = { |
| 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, |
| 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19 |
| }; |
| |
| /* |
| * SHA224Reset |
| * |
| * Description: |
| * This function will initialize the SHA224Context in preparation |
| * for computing a new SHA224 message digest. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The context to reset. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| int SHA224Reset(SHA224Context *context) |
| { |
| return SHA224_256Reset(context, SHA224_H0); |
| } |
| |
| /* |
| * SHA224Input |
| * |
| * Description: |
| * This function accepts an array of octets as the next portion |
| * of the message. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The SHA context to update. |
| * message_array[ ]: [in] |
| * An array of octets representing the next portion of |
| * the message. |
| * length: [in] |
| * The length of the message in message_array. |
| * |
| * Returns: |
| * sha Error Code. |
| * |
| */ |
| int SHA224Input(SHA224Context *context, const uint8_t *message_array, |
| unsigned int length) |
| { |
| return SHA256Input(context, message_array, length); |
| } |
| |
| /* |
| * SHA224FinalBits |
| * |
| * Description: |
| * This function will add in any final bits of the message. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The SHA context to update. |
| * message_bits: [in] |
| * The final bits of the message, in the upper portion of the |
| * byte. (Use 0b###00000 instead of 0b00000### to input the |
| * three bits ###.) |
| * length: [in] |
| * The number of bits in message_bits, between 1 and 7. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| int SHA224FinalBits(SHA224Context *context, |
| uint8_t message_bits, unsigned int length) |
| { |
| return SHA256FinalBits(context, message_bits, length); |
| } |
| |
| /* |
| * SHA224Result |
| * |
| * Description: |
| * This function will return the 224-bit message digest |
| * into the Message_Digest array provided by the caller. |
| * NOTE: |
| * The first octet of hash is stored in the element with index 0, |
| * the last octet of hash in the element with index 27. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The context to use to calculate the SHA hash. |
| * Message_Digest[ ]: [out] |
| * Where the digest is returned. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| int SHA224Result(SHA224Context *context, |
| uint8_t Message_Digest[SHA224HashSize]) |
| { |
| return SHA224_256ResultN(context, Message_Digest, SHA224HashSize); |
| } |
| |
| /* |
| * SHA256Reset |
| * |
| * Description: |
| * This function will initialize the SHA256Context in preparation |
| * for computing a new SHA256 message digest. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The context to reset. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| int SHA256Reset(SHA256Context *context) |
| { |
| return SHA224_256Reset(context, SHA256_H0); |
| } |
| |
| /* |
| * SHA256Input |
| * |
| * Description: |
| * This function accepts an array of octets as the next portion |
| * of the message. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The SHA context to update. |
| * message_array[ ]: [in] |
| * An array of octets representing the next portion of |
| * the message. |
| * length: [in] |
| * The length of the message in message_array. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| int SHA256Input(SHA256Context *context, const uint8_t *message_array, |
| unsigned int length) |
| { |
| if (!context) return shaNull; |
| if (!length) return shaSuccess; |
| if (!message_array) return shaNull; |
| if (context->Computed) return context->Corrupted = shaStateError; |
| if (context->Corrupted) return context->Corrupted; |
| |
| while (length--) { |
| context->Message_Block[context->Message_Block_Index++] = |
| *message_array; |
| |
| if ((SHA224_256AddLength(context, 8) == shaSuccess) && |
| (context->Message_Block_Index == SHA256_Message_Block_Size)) |
| SHA224_256ProcessMessageBlock(context); |
| |
| message_array++; |
| } |
| |
| return context->Corrupted; |
| |
| } |
| |
| /* |
| * SHA256FinalBits |
| * |
| * Description: |
| * This function will add in any final bits of the message. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The SHA context to update. |
| * message_bits: [in] |
| * The final bits of the message, in the upper portion of the |
| * byte. (Use 0b###00000 instead of 0b00000### to input the |
| * three bits ###.) |
| * length: [in] |
| * The number of bits in message_bits, between 1 and 7. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| int SHA256FinalBits(SHA256Context *context, |
| uint8_t message_bits, unsigned int length) |
| { |
| static uint8_t masks[8] = { |
| /* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80, |
| /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0, |
| /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8, |
| /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE |
| }; |
| static uint8_t markbit[8] = { |
| /* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40, |
| /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10, |
| /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04, |
| /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01 |
| }; |
| |
| if (!context) return shaNull; |
| if (!length) return shaSuccess; |
| if (context->Corrupted) return context->Corrupted; |
| if (context->Computed) return context->Corrupted = shaStateError; |
| if (length >= 8) return context->Corrupted = shaBadParam; |
| |
| SHA224_256AddLength(context, length); |
| SHA224_256Finalize(context, (uint8_t) |
| ((message_bits & masks[length]) | markbit[length])); |
| |
| return context->Corrupted; |
| } |
| |
| /* |
| * SHA256Result |
| * |
| * Description: |
| * This function will return the 256-bit message digest |
| * into the Message_Digest array provided by the caller. |
| * NOTE: |
| * The first octet of hash is stored in the element with index 0, |
| * the last octet of hash in the element with index 31. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The context to use to calculate the SHA hash. |
| * Message_Digest[ ]: [out] |
| * Where the digest is returned. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| int SHA256Result(SHA256Context *context, |
| uint8_t Message_Digest[SHA256HashSize]) |
| { |
| return SHA224_256ResultN(context, Message_Digest, SHA256HashSize); |
| } |
| |
| /* |
| * SHA224_256Reset |
| * |
| * Description: |
| * This helper function will initialize the SHA256Context in |
| * preparation for computing a new SHA-224 or SHA-256 message digest. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The context to reset. |
| * H0[ ]: [in] |
| * The initial hash value array to use. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| static int SHA224_256Reset(SHA256Context *context, uint32_t *H0) |
| { |
| if (!context) return shaNull; |
| |
| context->Length_High = context->Length_Low = 0; |
| context->Message_Block_Index = 0; |
| |
| context->Intermediate_Hash[0] = H0[0]; |
| context->Intermediate_Hash[1] = H0[1]; |
| context->Intermediate_Hash[2] = H0[2]; |
| context->Intermediate_Hash[3] = H0[3]; |
| context->Intermediate_Hash[4] = H0[4]; |
| context->Intermediate_Hash[5] = H0[5]; |
| context->Intermediate_Hash[6] = H0[6]; |
| context->Intermediate_Hash[7] = H0[7]; |
| |
| context->Computed = 0; |
| context->Corrupted = shaSuccess; |
| |
| return shaSuccess; |
| } |
| |
| /* |
| * SHA224_256ProcessMessageBlock |
| * |
| * Description: |
| * This helper function will process the next 512 bits of the |
| * message stored in the Message_Block array. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The SHA context to update. |
| * |
| * Returns: |
| * Nothing. |
| * |
| * Comments: |
| * Many of the variable names in this code, especially the |
| * single character names, were used because those were the |
| * names used in the Secure Hash Standard. |
| */ |
| static void SHA224_256ProcessMessageBlock(SHA256Context *context) |
| { |
| /* Constants defined in FIPS 180-3, section 4.2.2 */ |
| static const uint32_t K[64] = { |
| 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, |
| 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, |
| 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, |
| 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, |
| 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, |
| 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, |
| 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, |
| 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, |
| 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, |
| 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, |
| 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, |
| 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, |
| 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 |
| }; |
| int t, t4; /* Loop counter */ |
| uint32_t temp1, temp2; /* Temporary word value */ |
| uint32_t W[64]; /* Word sequence */ |
| uint32_t A, B, C, D, E, F, G, H; /* Word buffers */ |
| |
| /* |
| * Initialize the first 16 words in the array W |
| */ |
| for (t = t4 = 0; t < 16; t++, t4 += 4) |
| W[t] = (((uint32_t)context->Message_Block[t4]) << 24) | |
| (((uint32_t)context->Message_Block[t4 + 1]) << 16) | |
| (((uint32_t)context->Message_Block[t4 + 2]) << 8) | |
| (((uint32_t)context->Message_Block[t4 + 3])); |
| |
| for (t = 16; t < 64; t++) |
| W[t] = SHA256_sigma1(W[t-2]) + W[t-7] + |
| SHA256_sigma0(W[t-15]) + W[t-16]; |
| |
| A = context->Intermediate_Hash[0]; |
| B = context->Intermediate_Hash[1]; |
| C = context->Intermediate_Hash[2]; |
| D = context->Intermediate_Hash[3]; |
| E = context->Intermediate_Hash[4]; |
| F = context->Intermediate_Hash[5]; |
| G = context->Intermediate_Hash[6]; |
| H = context->Intermediate_Hash[7]; |
| |
| for (t = 0; t < 64; t++) { |
| temp1 = H + SHA256_SIGMA1(E) + SHA_Ch(E,F,G) + K[t] + W[t]; |
| temp2 = SHA256_SIGMA0(A) + SHA_Maj(A,B,C); |
| H = G; |
| G = F; |
| F = E; |
| E = D + temp1; |
| D = C; |
| C = B; |
| B = A; |
| A = temp1 + temp2; |
| } |
| |
| context->Intermediate_Hash[0] += A; |
| context->Intermediate_Hash[1] += B; |
| context->Intermediate_Hash[2] += C; |
| context->Intermediate_Hash[3] += D; |
| context->Intermediate_Hash[4] += E; |
| context->Intermediate_Hash[5] += F; |
| context->Intermediate_Hash[6] += G; |
| context->Intermediate_Hash[7] += H; |
| |
| context->Message_Block_Index = 0; |
| } |
| |
| /* |
| * SHA224_256Finalize |
| * |
| * Description: |
| * This helper function finishes off the digest calculations. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The SHA context to update. |
| * Pad_Byte: [in] |
| * The last byte to add to the message block before the 0-padding |
| * and length. This will contain the last bits of the message |
| * followed by another single bit. If the message was an |
| * exact multiple of 8-bits long, Pad_Byte will be 0x80. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| static void SHA224_256Finalize(SHA256Context *context, |
| uint8_t Pad_Byte) |
| { |
| int i; |
| SHA224_256PadMessage(context, Pad_Byte); |
| /* message may be sensitive, so clear it out */ |
| for (i = 0; i < SHA256_Message_Block_Size; ++i) |
| context->Message_Block[i] = 0; |
| context->Length_High = 0; /* and clear length */ |
| context->Length_Low = 0; |
| context->Computed = 1; |
| } |
| |
| /* |
| * SHA224_256PadMessage |
| * |
| * Description: |
| * According to the standard, the message must be padded to the next |
| * even multiple of 512 bits. The first padding bit must be a '1'. |
| * The last 64 bits represent the length of the original message. |
| * All bits in between should be 0. This helper function will pad |
| * the message according to those rules by filling the |
| * Message_Block array accordingly. When it returns, it can be |
| * assumed that the message digest has been computed. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The context to pad. |
| * Pad_Byte: [in] |
| * The last byte to add to the message block before the 0-padding |
| * and length. This will contain the last bits of the message |
| * followed by another single bit. If the message was an |
| * exact multiple of 8-bits long, Pad_Byte will be 0x80. |
| * |
| * Returns: |
| * Nothing. |
| */ |
| static void SHA224_256PadMessage(SHA256Context *context, |
| uint8_t Pad_Byte) |
| { |
| /* |
| * Check to see if the current message block is too small to hold |
| * the initial padding bits and length. If so, we will pad the |
| * block, process it, and then continue padding into a second |
| * block. |
| */ |
| if (context->Message_Block_Index >= (SHA256_Message_Block_Size-8)) { |
| context->Message_Block[context->Message_Block_Index++] = Pad_Byte; |
| while (context->Message_Block_Index < SHA256_Message_Block_Size) |
| context->Message_Block[context->Message_Block_Index++] = 0; |
| SHA224_256ProcessMessageBlock(context); |
| } else |
| context->Message_Block[context->Message_Block_Index++] = Pad_Byte; |
| |
| while (context->Message_Block_Index < (SHA256_Message_Block_Size-8)) |
| context->Message_Block[context->Message_Block_Index++] = 0; |
| |
| /* |
| * Store the message length as the last 8 octets |
| */ |
| context->Message_Block[56] = (uint8_t)(context->Length_High >> 24); |
| context->Message_Block[57] = (uint8_t)(context->Length_High >> 16); |
| context->Message_Block[58] = (uint8_t)(context->Length_High >> 8); |
| context->Message_Block[59] = (uint8_t)(context->Length_High); |
| context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24); |
| context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16); |
| context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8); |
| context->Message_Block[63] = (uint8_t)(context->Length_Low); |
| |
| SHA224_256ProcessMessageBlock(context); |
| } |
| |
| /* |
| * SHA224_256ResultN |
| * |
| * Description: |
| * This helper function will return the 224-bit or 256-bit message |
| * digest into the Message_Digest array provided by the caller. |
| * NOTE: |
| * The first octet of hash is stored in the element with index 0, |
| * the last octet of hash in the element with index 27/31. |
| * |
| * Parameters: |
| * context: [in/out] |
| * The context to use to calculate the SHA hash. |
| * Message_Digest[ ]: [out] |
| * Where the digest is returned. |
| * HashSize: [in] |
| * The size of the hash, either 28 or 32. |
| * |
| * Returns: |
| * sha Error Code. |
| */ |
| static int SHA224_256ResultN(SHA256Context *context, |
| uint8_t Message_Digest[ ], int HashSize) |
| { |
| int i; |
| |
| if (!context) return shaNull; |
| if (!Message_Digest) return shaNull; |
| if (context->Corrupted) return context->Corrupted; |
| |
| if (!context->Computed) |
| SHA224_256Finalize(context, 0x80); |
| |
| for (i = 0; i < HashSize; ++i) |
| Message_Digest[i] = (uint8_t) |
| (context->Intermediate_Hash[i>>2] >> 8 * ( 3 - ( i & 0x03 ) )); |
| |
| return shaSuccess; |
| } |