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LibCrypto: Correctly pad blocks with FinalBlockSize < size < BlockSize

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This fixes #2488
This commit is contained in:
AnotherTest 2020-06-04 16:46:26 +04:30 • committed by Andreas Kling
parent a3f51089d2
commit 63cc2f58ea
2 changed files with 30 additions and 3 deletions
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22
Libraries/LibCrypto/Hash/SHA2.cpp
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@ -110,17 +110,26 @@ SHA256::DigestType SHA256::peek()
DigestType digest;
size_t i = m_data_length;
if (BlockSize == m_data_length) {
transform(m_data_buffer);
m_bit_length += BlockSize * 8;
m_data_length = 0;
i = 0;
}
if (m_data_length < FinalBlockDataSize) {
m_data_buffer[i++] = 0x80;
while (i < FinalBlockDataSize)
m_data_buffer[i++] = 0x00;
} else {
// First, complete a block with some padding.
m_data_buffer[i++] = 0x80;
while (i < BlockSize)
m_data_buffer[i++] = 0x00;
transform(m_data_buffer);
// Then start another block with BlockSize - 8 bytes of zeros
__builtin_memset(m_data_buffer, 0, FinalBlockDataSize);
}
@ -218,17 +227,26 @@ SHA512::DigestType SHA512::peek()
DigestType digest;
size_t i = m_data_length;
if (BlockSize == m_data_length) {
transform(m_data_buffer);
m_bit_length += BlockSize * 8;
m_data_length = 0;
i = 0;
}
if (m_data_length < FinalBlockDataSize) {
m_data_buffer[i++] = 0x80;
while (i < FinalBlockDataSize)
m_data_buffer[i++] = 0x00;
} else {
// First, complete a block with some padding.
m_data_buffer[i++] = 0x80;
while (i < BlockSize)
m_data_buffer[i++] = 0x00;
transform(m_data_buffer);
// Then start another block with BlockSize - 8 bytes of zeros
__builtin_memset(m_data_buffer, 0, FinalBlockDataSize);
}